JPH11227029A - Serial two-stage extruder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a molded article uniform in thickness, in a serial two-stage extruder by keeping the emitting amt. of a resin constant always with high accuracy even if the change of the viscosity of a plasticized molten resin is generated accompanied by the change of the temp. change thereof. SOLUTION: A serial two-stage extruder is equipped with a motor driving speed control unit 80 for a first stage extruder operating operation quantity on the basis of the pressure deviation quantity to the pressure set value of pressure Pd detected by the pressure detector 28 of the inlet part of a die 50 and controlling the number of rotations of the motor 14 for driving a first stage extruder on the basis of this operation quantity so as to reduce the value of pressure deviation quantity and a second stage extruder temp. control apparatus 100 operating operation quantity on the basis of the temp. deviation quantity to the set temp. of the temp. td of a resin detected by the resin temp. detector 102 of the inlet part of the die 50 and controlling the temp. of the resin passing wall part of the second stage extruder 20 on the basis of this operation quantity so as to reduce the value of temp. deviation quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can be applied to, for example, an extruder for forming a film or a sheet-like resin molded product having a high precision in thickness, which can maintain a constant amount of molten resin discharged with high precision. And an in-line two-stage extruder.

[0002]

2. Description of the Related Art First, a conventional technique will be described. 20 is an overall schematic configuration diagram showing one example of a conventional tandem extruder, FIG. 21 is an overall schematic configuration diagram showing an example of another conventional tandem extruder different from FIG. 20, and FIGS. 21 is another conventional tandem extruder,
FIG. 2 is an overall schematic configuration diagram showing an example.

First, in FIG. 20, a conventional tandem extruder comprises a first-stage extruder 10 for plasticizing a resin, and a homogenizing, measuring and pressurizing resin plasticized in the first-stage extruder. And the connecting pipe 3 for interconnecting the first-stage extruder 10 and the second-stage extruder 20 with each other.
0, and a die 50 disposed at the outlet of the second-stage extruder 20 via the connection pipe 40. Thus the die 50
Is generally connected to the outlet of the second-stage extruder 20 via a connection pipe 40, and a filter 60 is generally provided in the middle of the connection pipe 40. Further, a cooling device is provided in a downstream portion of the die 50, and the molten resin discharged from the die 50 is cooled by the cooling device and formed into a certain shape.

In FIG. 20, a first-stage extruder 10 comprises a cylinder 12 having an inlet connected to a resin material charging hopper and an outlet connected to an inlet of a connecting pipe 30;
2 and a screw 11 which is driven to rotate. The screw 11 is driven to rotate by a first-stage extruder driving motor 14 via a speed reduction device 15. The cylinder 12
Is controlled by the heater 13 whose output is controlled by the heater output control device 16. On the other hand, the second-stage extruder 20 has a cylinder 22 whose inlet side is connected to the outlet of the connecting pipe 30 and whose outlet side is connected to the connecting pipe 40, and a screw 21 which is driven to rotate in the cylinder 22. The screw 21 is rotationally driven by a second-stage extruder driving motor 24 via a reduction gear 25,
Is controlled by the heater 23 whose output is controlled by the heater output control device 26.

[0005] Referring to FIG.
A pressure detector 172 is provided in a pressure detector set between the pressure sensor and the outlet 32. The pressure of the molten resin in the connection pipe 30 detected by the pressure detector 172 is equal to the pressure. It is transmitted in the form of a pressure signal representing the magnitude of the value to the deviation calculator 173 constituting the motor drive speed controller 17 for driving the first stage extruder. In the deviation calculator 173, the pressure detected by the pressure detector 172 and the pressure setter 17
The set pressure set in step 1 is compared with the set pressure, and the pressure deviation amount of the pressure detected by the pressure detector 172 with respect to the set pressure is calculated.

In FIG. 20, the pressure deviation calculated by the deviation calculator 173 is sent to the manipulated variable calculator 174, and the manipulated variable calculator 174 outputs the pressure difference.
An operation amount required for controlling the first-stage extruder driving motor 14 is calculated based on the pressure deviation amount sent from the third stage. The operation amount calculated by the operation amount calculator 174 is sent to the motor rotation speed control device 18,
Is, according to the manipulated variable sent from the manipulated variable calculator 174,
The number of rotations of the first-stage extruder drive motor 14 is controlled.

When the resin is formed into a film or a sheet, the molten resin discharged from the die 50 is generally wound around a cooling roll as a cooling device and cooled. The thickness of the molded product is controlled by a thickness control device. In controlling the thickness of the molded product, the thickness h of the molded product exiting the cooling roll is detected by a thickness detector, and the output of the manipulated variable operation device is controlled, for example, the thickness provided on the lip portion 300 of the die 50. By driving the control device, the lip 30
This is performed by controlling the resin discharge amount Q while adjusting the zero lip gap. At that time, if the discharge amount Q of the resin can be kept constant, a molded product having a uniform thickness can be obtained.

In FIG. 20, when the discharge amount Q of the tandem extruder is controlled to be constant, the discharge amount is detected by the pressure detector 172 while the rotation speed of the motor 24 for driving the second stage extruder 20 is kept constant. The pressure is the pressure setter 171
It is conceivable to control the number of revolutions of the first-stage extruder drive motor 14 via the first-stage extruder drive motor drive speed control device 17 so that the set pressure becomes equal to the set pressure.

[0009] The conventional tandem extruder shown in FIG. The motor 1 for driving the first-stage extruder via the motor drive speed control device 17 for
In addition to being configured to control the rotational speed of the die 4, a pressure detector 272 is provided at the entrance of the die 50.

In the tandem extruder shown in FIG.
The pressure of the molten resin at the inlet of the die 50 detected by the pressure detector 272 constitutes the motor drive speed control device 27 for driving the second stage extruder in the form of a pressure signal representing the magnitude of the pressure value. To the deviation calculator 273. In the deviation calculator 273, the pressure detected by the pressure detector 272 is compared with the set pressure set by the pressure setter 271 to calculate the pressure deviation of the pressure detected by the pressure detector 272 with respect to the set pressure. .

In FIG. 21, the pressure deviation calculated by the deviation calculator 273 is sent to the manipulated variable calculator 274, where it is calculated.
The amount of operation required for controlling the second-stage extruder drive motor 24 is calculated based on the pressure deviation amount sent from 3. The operation amount calculated by the operation amount calculator 274 is sent to the motor speed control device 28, and the motor speed control device 28
According to the manipulated variable sent from the manipulated variable calculator 274,
The number of rotations of the second-stage extruder drive motor 24 is controlled.

In the tandem extruder shown in FIG. 21, the first stage extruder driving motor 14 and the second stage extruder are driven so that the pressures detected by the pressure detector 172 and the pressure detector 272 are constant. The rotation speed of the driving motor 24 is controlled by the motor rotation speed control devices 18 and 28, respectively, to detect the pressure of the molten resin and the pressure at which the pressure detector 272 is disposed at the detection unit where the pressure detector 172 is disposed. The pressure of the molten resin in the section is controlled so as to be constant.

FIG. 22 shows a technique disclosed in Japanese Patent Application Laid-Open No. 03-23922. In the tandem extruder of FIG. 22, the die 5 detected by the pressure detector 272 is used.
The pressure of the molten resin at the inlet of 0 is transmitted to the deviation calculator 273 in the form of a pressure signal indicating the magnitude of the pressure. In the deviation calculator 273, the pressure detected by the pressure detector 272 is compared with the set pressure set by the pressure setter 271 to calculate the pressure deviation of the pressure detected by the pressure detector 272 with respect to the set pressure. .

In FIG. 22, the pressure deviation calculated by the deviation calculator 273 is sent to the manipulated variable calculator 274, and the manipulated variable calculator 274 outputs the pressure deviation.
An operation amount required for controlling the first-stage extruder driving motor 14 is calculated based on the pressure deviation amount sent from the third stage. The operation amount calculated by the operation amount calculator 274 is sent to the motor rotation speed control device 18, and the motor rotation speed control device 18
According to the manipulated variable sent from the manipulated variable calculator 274,
The number of rotations of the first-stage extruder drive motor 14 is controlled.

[0015]

In the above-described conventional tandem extruders, however, only the pressure is detected and the drive motor of the tandem extruder is controlled. In controlling the amount, the discharge amount of the plasticized resin responds to a pressure change due to a change in viscosity of the plasticized molten resin due to a temperature change. Therefore, the discharge amount of the resin cannot be kept constant with high accuracy.

Accordingly, the present invention is to provide a resin discharge amount that can be constantly maintained with high precision even if the viscosity of the plasticized molten resin changes due to a temperature change.
An object of the present invention is to provide an in-line two-stage extruder capable of obtaining a molded product having a uniform thickness (claim 1).

Further, according to the present invention, a pressure deviation amount of a resin discharge pressure with respect to a set pressure is corrected by a correction deviation amount corresponding to one of the temperature of the molten resin and the temperature deviation amount with respect to the set temperature. By controlling the discharge amount of the resin based on the value corrected by, even if there is a change in viscosity due to a temperature change of the plasticized molten resin,
It is an object of the present invention to provide a two-stage in-line extruder capable of always maintaining a constant discharge amount of resin with high accuracy and obtaining a molded product having a uniform thickness. 2).

Further, the present invention provides a method of correcting a pressure deviation amount of a resin discharge pressure with respect to a set pressure to a correction deviation according to one of the thickness of the resin molded product and the thickness deviation amount with respect to the set thickness. The discharge amount of the resin can be controlled based on the value corrected by the amount, so that even if there is a change in the viscosity due to the temperature change of the plasticized molten resin, the discharge amount of the resin is always highly accurate. It is an object of the present invention to provide an in-line two-stage extruder capable of maintaining a constant thickness and obtaining a molded product having a uniform thickness (claim 3).

Further, according to the present invention, the pressure deviation amount of the resin discharge pressure with respect to the set pressure is corrected by the correction deviation amount corresponding to one of the temperature of the molten resin and the temperature deviation amount with respect to the set temperature. It is possible to control the discharge amount of the resin based on a value corrected by the correction deviation amount corresponding to one of the thickness of the resin molded product and the thickness deviation amount with respect to the set thickness of the same thickness. Therefore, even if there is a change in viscosity due to a change in temperature of the plasticized molten resin, it is possible to always keep the discharge amount of the resin constant with high accuracy and obtain a molded product having a uniform thickness. (Claim 4).

Further, according to the present invention, the difference between the differential pressure of the molten resin generated along the flow of the molten resin and the set differential pressure is determined by calculating the temperature difference between the temperature of the molten resin and the set temperature of the same temperature. In order to be able to control the discharge amount of the resin based on the value corrected by the correction deviation amount according to one of the values, even if there is a change in viscosity due to a temperature change of the plasticized molten resin It is an object of the present invention to provide a two-stage in-line extruder capable of always keeping a constant amount of resin discharged with high accuracy and obtaining a molded product having a uniform thickness. Item 5).

Further, according to the present invention, the difference between the differential pressure of the molten resin and the differential pressure generated along the flow of the molten resin with respect to the set differential pressure is determined by calculating the temperature difference between the temperature of the molten resin and the set temperature of the same temperature. The drive speed of the first-stage extruder drive motor can be controlled based on the value corrected by the correction deviation amount corresponding to one of the values, and the temperature of the molten resin and the setting of the same temperature can be controlled. The temperature of the second-stage extruder can be controlled in accordance with one of the temperature deviation amounts with respect to the temperature, so that the viscosity of the plasticized molten resin changes with the temperature. However, it is an object of the present invention to provide a two-stage in-line extruder capable of always maintaining a constant amount of resin discharged with high accuracy and obtaining a molded product having a uniform thickness. (Claim 6)

Further, according to the present invention, the differential pressure difference of the molten resin with respect to the set differential pressure generated along the flow of the molten resin is determined by calculating the thickness difference between the thickness of the resin molded product and the set thickness of the same thickness. The drive speed of the motor for driving the first-stage extruder can be controlled based on the value corrected by the correction deviation amount corresponding to any one of the above values, so that the temperature change of the plasticized molten resin can be controlled. Even if there is a change in viscosity due to the above, a two-stage in-line extruder that can always keep the discharge amount of the resin constant with high accuracy and can obtain a molded product having a uniform thickness. It is intended to be provided (claim 7).

Further, the present invention provides a method of calculating the difference between the differential pressure of the molten resin and the set differential pressure which occurs along the flow of the molten resin, based on the temperature of the molten resin and the temperature deviation between the set temperature and the same temperature. Based on the value corrected by the correction deviation amount according to any one of the values and the correction deviation amount according to any one of the thickness deviation amounts with respect to the thickness of the resin molded product and the set thickness of the same thickness. By controlling the driving speed of the motor for driving the first-stage extruder,
Even if there is a change in viscosity due to a change in temperature of the plasticized molten resin, it is possible to constantly maintain the discharge amount of the resin with high accuracy and to obtain a molded product having a uniform thickness. It is an object of the present invention to provide an in-line two-stage extruder (claim 8).

Further, the present invention provides a method of measuring the difference between the differential pressure of the molten resin and the differential pressure of the molten resin in the connecting pipe section connecting the first-stage extruder and the second-stage extruder with respect to the temperature of the molten resin and the same. The discharge amount of the resin can be controlled based on the value corrected by the correction deviation amount corresponding to one of the temperature deviation amounts with respect to the set temperature of the temperature, so that the plasticized molten resin can be controlled. In-line two-stage extrusion that enables the resin discharge amount to be constantly maintained with high accuracy even when the viscosity changes due to temperature change, and a molded product with a uniform thickness can be obtained. It is intended to provide a device (claim 9).

The present invention also relates to a method for determining the difference between the differential pressure of the molten resin and the set differential pressure in the section between the inlet and the outlet of the second-stage extruder by determining the temperature of the molten resin and the temperature of the molten resin. The temperature change of the plasticized molten resin can be controlled based on the value corrected by the correction deviation amount corresponding to one of the temperature deviation amounts with respect to the set temperature. Even if there is a change in viscosity due to the above, a two-stage in-line extruder that can always keep the discharge amount of the resin constant with high accuracy and can obtain a molded product having a uniform thickness. It is intended to be provided (claim 10).

[0026]

In order to solve the above-mentioned problems, a two-stage in-line extruder according to the present invention is driven by a first-stage extruder driving motor 14 to extrude a molten resin. And a second-stage extruder 20 for extruding the molten resin extruded from the outlet of the first-stage extruder 10 and sent through the connection pipe 30 by being driven by the second-stage extruder motor 24.
And a die 50 that is connected to the outlet of the second-stage extruder 20 and that discharges the molten resin extruded from the second-stage extruder 20. there are, calculates the manipulated variable u _N1P based on the pressure deviation e _p for setting pressure of the pressure which the pressure detector detects that detects the resin pressure at the inlet portion near the die 50, the pressure deviation on the basis of the manipulated variable and the first stage extruder drive motor drive speed control device 80 for controlling the rotational speed n ₁ of the first stage extruder drive motor 14 so as to reduce the value of the quantity e _p, inlet vicinity of the die 50 the value of the resin temperature to calculate the manipulated variable u _H2T based on the temperature deviation e _t for the set temperature of the temperature t _d of the resin the resin temperature detector detects that detects a, based on the operation amount of the temperature deviation amount e _t So that the second
A second-stage extruder temperature control device 100 for controlling the temperature of the resin passage wall of the second-stage extruder is provided (claim 1).

Further, in the in-line two-stage extruder according to the present invention, the first-stage extruder driving motor drive speed controller 8
0, the pressure deviation e _p is the pressure base deviation e _p, the same pressure basic deviation e _p, the resin temperature detector temperature detected by t _d and temperature deviation e _t for the same temperature of the set temperature
Any deviation correction amount .delta.e _pt obtained by a calculation based on one value calculates the manipulated variable u _N1P based on the correction pressure deviation e _pf obtained by adding, the correction based on the operation amount of the The first-stage extruder drive motor drive speed control device 80 that controls the rotation speed n ₁ of the first-stage extruder drive motor 14 so as to reduce the value of the pressure deviation amount e _pf (claim) 2).

Further, in the in-line two-stage extruder of the present invention, the first-stage extruder driving motor drive speed controller 8
0, the pressure deviation e _p is the pressure base deviation e _p, the same pressure basic deviation e _p, any of the thickness deviation amount e _h for setting the thickness of the thickness h and the thickness of the resin molded product Deviation correction amount δe _ph obtained by calculating based on one of the values
_Is manipulated based on the corrected pressure deviation amount e _pf obtained by adding
_1p, and calculates the corrected pressure deviation amount e _pf based on the operation amount.
Is configured as a first-stage extruder driving motor drive speed control device 80 that controls the number of revolutions n ₁ of the first-stage extruder driving motor 14 so as to reduce the value of (1).

Further, in the in-line two-stage extruder of the present invention, the motor drive speed control device 8 for driving the first-stage extruder is provided.
0, the pressure deviation e _p is the pressure base deviation e _p, the same pressure basic deviation e _p, the resin temperature detector temperature detected by t and the temperature deviation e _t for the same temperature of the set temperature
One of the deviation correction amount .delta.e _pt obtained by a calculation based on the value, either the value of the thickness deviation amount e _h for setting the thickness of the thickness h and the thickness of the resin molded product of the The operation amount _un1p is calculated based on the corrected pressure deviation amount e _pf obtained by adding the deviation correction amount δe _ph obtained by _{performing the} calculation based on the above, and the value of the corrected pressure deviation amount e _pf is calculated based on the operation amount. So that the first stage extruder drive motor 14
Is configured as a motor drive speed control device 80 for driving the first-stage extruder that controls the rotation speed n ₁ of the first stage.

Further, the in-line two-stage extruder of the present invention includes a first-stage extruder 10 driven by a first-stage extruder drive motor 14 to extrude a molten resin, and an outlet of the first-stage extruder 10. A second-stage extruder 20 driven by a second-stage extruder motor 24 to extrude the molten resin extruded from the section and sent through the connecting pipe 30; And a die 50 for discharging the molten resin extruded from the second-stage extruder 20 to form a resin molded product.
A stage extrusion apparatus, the operation amount u _n1 △ _p1 based on a difference pressure deviation amount e △ _p1 for the set differential pressure of the differential pressure △ p ₁ detected in the differential pressure setting unit that sets along the flow of the molten resin The first-stage extruder driving motor 14 is operated to reduce the value of the differential pressure deviation amount e 量_p1 based on the operation amount.
Motor speed control devices 110 and 120 for driving the first-stage extruder for controlling the rotation speed n ₁ of the resin and the resin temperature t detected by the resin temperature detector 102 for detecting the resin temperature near the entrance of the die 50 calculates the manipulated variable u _H2T based on either the value of the temperature deviation e _t for setting the temperature of the _d and the same temperature, the temperature deviation amount e _t on the basis of the manipulated variable
And a second-stage extruder temperature controller 100 for controlling the temperature of the resin passage wall portion of the second-stage extruder so as to reduce the value of the second-stage extruder.

Further, in the in-line two-stage extruder of the present invention, the first-stage extruder driving motor drive speed controller 1
20 converts the differential pressure deviation e △ _p1 into the basic differential pressure e △ _p
And then, the same difference圧基present deviation e △ _p, based on either the value of the temperature deviation e _t for the temperature t _d and the same temperature of the set temperature of the resin the resin temperature detector 102 detects operation deviation correction amount .delta.e △ correction difference obtained by adding the _p2t pressure deviation amount obtained by the e △ calculates the manipulated variable u _n1 △ _p2 based on _p2f, the corrected differential pressure deviation amount based on the operation amount e △ _The motor 1 for driving the first-stage extruder so as to reduce the value of _p2f.
The second stage extruder temperature control device 100 is configured as a first stage extruder drive motor drive speed control device 120A for controlling the number of rotations n ₁ of the first extruder.
There calculates the manipulated variable u _P2T based on either the value of the temperature t _d and the same temperature of the set temperature for the temperature deviation amount e _t of the detected resin, the temperature deviation amount e _t on the basis of the manipulated variable Second-stage extruder temperature controller 1 for controlling the temperature of the resin passage wall of the second-stage extruder so as to reduce the value
00 (claim 6).

Further, in the in-line two-stage extruder according to the present invention, the first-stage extruder driving motor drive speed controller 1
20 converts the differential pressure deviation e 圧_p into the basic differential pressure e △ _p
And then, the same difference圧基present deviation e △ _p, the thickness deviation amount with respect to the thickness set value of the thickness h and the thickness of the resin molded product e _h
It corrected differential pressure deviation amount deviation correction amount .delta.e △ _P2H obtained by calculation based on one value obtained by adding one of the e △
_An operation amount u _{n1 Δp} is calculated based on _p2f , and the rotation speed n ₁ of the first-stage extruder drive motor 14 is set so as to reduce the value of the corrected differential pressure deviation amount e △ _p2f based on the operation amount. Motor drive speed control device 120B for driving the first stage extruder to be controlled
(Claim 7).

Further, in the in-line two-stage extruder of the present invention, the first-stage extruder driving motor drive speed controller 1
20 calculates the differential pressure difference e 圧_p2 from the basic differential pressure e △ _p2.
And then, the same difference圧基present deviation e △ _p2, and a calculation based on either the value of the temperature deviation e _t for the resin temperature detector 102 is the set temperature of the temperature t and the temperature detected a deviation correction amount .delta.e _pt obtained deviation correction amount obtained by the calculation based on either the value of the thickness deviation amount e _h for setting the thickness of the thickness h and the thickness .delta.e △
and _p2h calculates the manipulated variable u _N1P based on the addition obtained was corrected differential pressure deviation amount e △ _p2f, the first to reduce the value of the corrected differential pressure deviation amount e △ _p2f based on the operation amount It is configured as a first-stage extruder driving motor drive speed control device 120B for controlling the number of revolutions n ₁ of the first-stage extruder driving motor 14 (claim 8).

Further, in the in-line two-stage extruder of the present invention, the differential pressure setting section is connected between an outlet of the first-stage extruder and an inlet of the second-stage extruder. It is set in the tube 30 (claim 9).

Further, in the in-line two-stage extruder according to the present invention, the differential pressure setting section is set in a section between the inlet and the outlet of the second-stage extruder 20.
0).

[0036]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall schematic configuration diagram of an in-line two-stage extruder according to a first embodiment of the present invention, and FIG. 2 is a control system explanatory diagram of the in-line two-stage extruder of FIG.

Referring first to FIGS. 1 and 2, the in-line two-stage extruder of the present invention comprises a first-stage extruder 10 for plasticizing resin.
A second-stage extruder 20 for homogenizing, measuring, and increasing the pressure of the resin plasticized in the first-stage extruder;
A connecting pipe 30 for interconnecting the two-stage extruder 10 and the second-stage extruder 20, and a connecting pipe 40 at the outlet of the second-stage extruder 20;
And a die 50 disposed through the dies. In the middle of the connection pipe 40, a filter 60 is interposed. A cooling device is provided in a downstream part of the die 50, and the molten resin discharged from the die 50 is cooled by the cooling device and formed into a certain shape.

In FIGS. 1 and 2, the first-stage extruder 1
0 has a cylinder 12 whose inlet side is connected to the resin material charging hopper and whose outlet side is connected to the inlet of the connection pipe 30, and a screw 11 that is driven to rotate in the cylinder 12. The screw 11 is driven to rotate by a first-stage extruder driving motor 14 via a speed reduction device 15. The temperature of the cylinder 12 is controlled by a heater 13 whose output is controlled by a heater output control device 16. In contrast,
The second-stage extruder 20 includes a cylinder 22 having an inlet connected to an outlet of the connecting pipe 30 and an outlet connected to the connecting pipe 40;
And a screw 21 that is driven to rotate in the cylinder 22. The screw 21 includes a second-stage extruder driving motor 24.
, And the cylinder 22 is temperature-controlled by a heater 23 whose output is controlled by a heater output control device 26.

In FIGS. 1 and 2, the in-line two-stage extruder comprises a first-stage extruder driving motor drive speed controller 80
And a second-stage extruder temperature control device 100. First
The motor drive speed control device 80 for driving the stepped extruder is
The pressure deviation amount e _{p of} the pressure p _d detected by the pressure detector 82 for detecting the resin pressure near the inlet portion of 0 with respect to the set pressure p _ds
It calculates the manipulated variable u _N1P based on, controls the rotational speed n ₁ of the first stage extruder drive motor 14 so as to reduce the value of the pressure deviation e _p based on the operation amount u _N1P.

That is, in FIGS. 1 and 2, a pressure detector 82 for detecting the resin pressure near the entrance of the die 50 is used.
Calculates the deviation amount calculator 8 using the detected pressure p _d in the form of a pressure signal.
Send to 3. The deviation calculator 83 calculates the pressure p _d sent from the pressure detector 82 and the set pressure p set by the pressure setter 81.
It calculates the pressure deviation e _p for setting the pressure p _ds pressure p _d and comparing the _ds, and sends its output to the operation amount calculation unit 84. Manipulated variable calculator 84 calculates the operation amount u _N1P based on the pressure deviation e _p sent from deviation computing unit 83, and sends its output to the motor speed control system 18. The motor rotation speed controller 18 controls the operation amount u sent from the operation amount calculator 84.
Based on _N1P, so as to reduce the value of the pressure deviation e _p, controls the rotational speed n ₁ of the first stage extruder drive motor 14.

In FIG. 1 and FIG. 2, the second-stage extruder temperature controller 100 controls the resin temperature t _d and the resin temperature t _d detected by the resin temperature detector 102 for detecting the resin temperature near the inlet of the die 50. to calculate the manipulated variable u _H2T based on either the value of the temperature deviation e _t for setting temperature t _s of the same temperature, decreasing the value of the temperature deviation e _t based on the operation amount u _H2T Then, the temperature of the second-stage extruder 20 is controlled.

That is, in FIGS. 1 and 2, the resin temperature detector 102 for detecting the resin temperature near the entrance of the die 50 transmits the detected resin temperature t _d to the deviation calculator 103 in the form of a temperature signal. send. The deviation amount calculator 103 compares the resin temperature t _d sent from the resin temperature detector 102 with the set temperature t _s set by the temperature setting device 101, and calculates the temperature t _d
Setting calculates the temperature deviation e _t for the temperature t _s, and sends its output to the operation amount calculation unit 104. Manipulated variable calculator 104
The operation amount based on the value of the temperature deviation e _t as shown either one, for example, in FIGS. 1 and 2 of the temperature deviation e _t for the temperature t _d and the set temperature t _s of the temperature of the resin _Uh2t is calculated, and the output is calculated by the heater output controller 2
Send to 6. The heater output control device 26 includes the manipulated variable calculator 1
And controlling the heat output q ₂ of the heater 23 based on the operation amount u _H2T sent from 04, so as to reduce the value of the temperature deviation e _t, controls the temperature of the second stage extruder 20.

1 and 2, it is assumed that the in-line two-stage extruder is operated at a target pressure and a target resin temperature. Here, disturbance such as a change in the discharge amount Q due to clogging of the filter 60 or a change in the temperature of the input material,
For example, it is assumed that there is disturbance due to clogging of the filter 60. In this case, since the resistance of the connection pipe 40 increases due to the clogging of the filter 60, the discharge amount Q decreases,
Resin temperature t _d is going to rise. At this time, as described above, the temperature t _{d of the} molten resin flowing in the connection pipe 40 immediately before the outlet of the filter 60 or the inlet of the die 50 is detected by the resin temperature detector 102. The temperature t _{d of the} molten resin detected by the resin temperature detector 102 and the set temperature t _s set by the temperature setting device 101 which is the target resin temperature.
Based on the temperature deviation amount e _t between its temperature deviation e _t
So that the cylinder 22 of the second stage extruder 20 becomes zero.
Is controlled, thereby preventing a rise in resin temperature.

[0044] In addition, setting the pressure of the inlet immediately before the outlet or die 50 of the filter 60 is detected by the pressure detector 82, the pressure setting device 81 is a detection pressure p _d and the target pressure pressure detector 82 has detected is set the pressure drop between the basis of the pressure deviation e _p, as the pressure deviation e _p is zero value, thus the pressure detecting portion and the die outlet with a decrease in the discharge amount Q between the pressure p _ds In order to compensate, the rotation speed n _{1 of} the first-stage extruder drive motor 14 is increased, and the discharge amount Q
Is prevented from decreasing.

In FIGS. 1 and 2, if the temperature of the resin flowing between the pressure detector and the outlet of the die 50 does not fluctuate over time, the viscosity of the resin does not fluctuate over time. The pressure loss between the 50 outlets is a function of the flow Q only. Therefore, as described above, the resin temperature t
If the control is performed such that _d is constant and the pressure loss of the die 50 is constant, the discharge amount Q can be kept constant with high accuracy, and the discharge amount constant control can be performed with high accuracy.

FIG. 3 is an overall schematic configuration diagram of a two-stage in-line extruder according to a second embodiment of the present invention, and FIG.
It is a control system explanatory drawing of a step extrusion apparatus. 3 and 4, the in-line two-stage extruder has a motor drive speed controller 80A for driving the first-stage extruder. The first stage extruder drive motor drive speed control device 80A includes a pressure deviation e _p is the pressure base deviation e _p, the same pressure basic deviation e _p, the temperature t _d of the resin temperature detector 102 detects setting calculates the manipulated variable u _N1P based on the correction pressure deviation e _pf obtained by adding the temperature deviation e _t to based deviation correction amount .delta.e _pt obtained by the calculation for the temperature Ts, the same operation amount u _N1P The rotation speed n ₁ of the first-stage extruder drive motor 14 is controlled so as to reduce the value of the corrected pressure deviation amount e _{pf on} the basis of the value.

That is, in FIG. 3 and FIG. 4, a pressure detector 82 which detects the resin pressure near the entrance of the die 50 is used.
Sends the detected pressure p _d to the deviation calculator 83 in the form of a pressure signal. Deviation computing unit 83, a pressure deviation e _p for setting the pressure P _ds pressure P _d is compared with the set pressure P _ds pressure P _d and the pressure setter 81 sent from the pressure detector 82 is set Calculation is performed, and the output is sent to the adder 213.

On the other hand, the resin temperature detector 102 for detecting the resin temperature near the entrance of the die 50 sends the detected resin temperature t _d to the deviation calculator 103 in the form of a temperature signal. Deviation computing unit 103 compares the set temperature T _s temperature t _d and a temperature setter 101 of the resin sent from the resin temperature detector 102 is set, the temperature deviation with respect to the set temperature T _s of the temperature t _d e _t is calculated, and its output is sent to the manipulated variable calculator 104, and at the same time, it is also sent to the calculation device 212 via the input means 211. In this case, the temperature deviation e _t may be via whether discriminating means exceeds the limit. The arithmetic unit 212
Set temperature T of temperature t _d detected by resin temperature detector 102
It calculates a deviation correction amount .delta.e _pt on the basis of the temperature deviation e _t for s, and sends its output to the adder 213.

In FIG. 3 and FIG.
Is the pressure deviation e _p is the pressure base deviation e _p, the same pressure basic deviation e _p, by adding the deviation correction amount .delta.e _pt calculates a corrected pressure deviation e _pf, the manipulated variable calculating its output To the container 84. Manipulated variable calculator 84 calculates the operation amount u _N1P based on the correction pressure deviation e _pf sent from the adder 213, and sends its output to the motor speed control system 18. Motor speed controller 18, based on the sent from the operation amount calculation unit 84 manipulated variable u _N1P, so as to reduce the value of the correction pressure deviation e _pf, the rotation speed of the first stage extruder drive motor 14 Control n ₁ .

FIG. 5 is an overall schematic configuration diagram of an in-line two-stage extruder according to a third embodiment of the present invention, and FIG.
It is a control system explanatory drawing of a step extrusion apparatus. 5 and 6, the in-line two-stage extruder has a first-stage extruder driving motor drive speed controller 80A1. The motor drive speed control device 80A1 for driving the first-stage extruder drives the pressure deviation e
The _p and pressure basic deviation e _p, the same pressure basic deviation e _p,
The operation amount u _N1P based on the correction pressure deviation e _pf the resin temperature detector 102 is obtained by adding the deviation correction amount .delta.e _pt obtained by a calculation based on the value of the temperature t _d detected computed, the operation The rotation speed n ₁ of the first-stage extruder driving motor 14 is controlled so as to reduce the value of the corrected pressure deviation amount e _pf based on the amount u _n1p .

That is, in FIGS. 5 and 6, a pressure detector 82 which detects the resin pressure near the entrance of the die 50 is used.
Calculates the deviation amount calculator 8 using the detected pressure p _d in the form of a pressure signal.
Send to 3. Deviation computing unit 83, the set pressure P of the pressure P _d and the pressure setter 81 sent from the pressure detector 82 is set
calculates the pressure deviation e _p for setting the pressure P _ds pressure P _d is compared with _ds, the point that sends its output to the adder 213, it is similar to that of FIGS.

On the other hand, the resin temperature detector 102 for detecting the resin temperature near the entrance of the die 50 sends the detected resin temperature t _d to the deviation calculator 103 in the form of a temperature signal, and simultaneously inputs the same. It is also sent to the arithmetic unit 212 via the means 211. Deviation computing unit 103 compares the set temperature T _s temperature t _d and a temperature setter 101 of the resin sent from the resin temperature detector 102 is set, the temperature deviation with respect to the set temperature T _s of the temperature t _d e _t , and the output is manipulated variable calculator 1
Send to 04. On the other hand, the arithmetic unit 212 calculates the deviation correction amount δ based on the value of the temperature t _d sent from the resin temperature detector 102.
_Compute e _pt and send the output to adder 213.

In FIGS. 5 and 6, adder 213 is used.
As in the case of FIGS. 3 and 4, the pressure deviation e _p is the pressure base deviation e _p, the same pressure basic deviation e _p, adds sent from the arithmetic unit 212 deviation correction amount .delta.e _pt Then, the corrected pressure deviation amount e _pf is calculated, and the output is sent to the manipulated variable calculator 84. Manipulated variable calculator 84 calculates the operation amount u _N1P based on the correction pressure deviation e _pf sent from the adder 213, and sends its output to the motor speed control system 18. Motor speed controller 18, based on the sent from the operation amount calculation unit 84 manipulated variable u _N1P, so as to reduce the value of the correction pressure deviation e _pf, the rotation speed of the first stage extruder drive motor 14 Control n ₁ .

[0054] Keep series two-stage extrusion apparatus shown in FIGS. 5 and 6, as described above, the pressure deviation e _p is corrected based on the temperature signal t _d. The concept of the correction in this case is as shown in FIG. 17 as a calculation explanatory diagram for explaining the calculation when calculating the correction amount based on the viscosity of the deviation amount of the pressure or the differential pressure in the in-line two-stage extruder of the present invention.

In FIG. 17, when the pressure is constant, the viscosity (p
oise) has the characteristic that it decreases exponentially with temperature. Also, when the pressure is increased at a constant temperature, the viscosity has the characteristic of decreasing exponentially. When this is plotted using viscosity and temperature on orthogonal axes and pressure as a parameter, FIG.
In the first quadrant. The relationship between the discharge amount Q and the viscosity η is a graph in the second quadrant. Further, the relationship between the discharge amount Q and the pressure or the differential pressure is a graph in the third quadrant.

In FIG. 17, it is assumed that the operating point is, for example, a pressure p _d1 and a temperature t _{d1 based} on the above relationship. Temperature t _d1
Increases by δt _d1 , the viscosity decreases from η ₁ to η ₂ . As a result, the discharge amount Q increases, and as a result, the pressure or differential pressure increases. Then, the temperature increase .DELTA.t _d1 this time, since corresponding to .delta.p _d or [delta] △ p _d, decreasing the value of the set pressure p _ds As this minute pressure is reduced. The variation .delta.p _d of the pressure at this time, it is equivalent to be added to the deviation e _p of pressure or differential pressure deviation is increased, the output manipulated variable for reducing the deviation is increased, more It quickly converges to the set value.

FIG. 7 is an overall schematic configuration diagram of an in-line two-stage extruder according to a fourth embodiment of the present invention, and FIG.
It is a control system explanatory drawing of a step extrusion apparatus. 7 and 8, the in-line two-stage extruder has a motor drive speed controller 80B for driving the first-stage extruder. The first stage extruder drive motor drive speed control device 80B has a pressure deviation e _p is the pressure base deviation e _p, the same pressure basic deviation e _p, the temperature t _d of the resin temperature detector 102 detects while adding the deviation correction amount .delta.e _pt obtained by a calculation based on the temperature deviation e _t for the set temperature Ts, of the thickness deviation amount e _h for setting the thickness h _s of the thickness h and Doatsumi h of the resin molded product The operation amount un _1p is calculated based on the corrected pressure deviation amount e _pf obtained by also adding the deviation correction amount δe _ph obtained by performing the operation based on any one of the above values, and the corrected pressure The rotation speed n ₁ of the first-stage extruder driving motor 14 is controlled so as to reduce the value of the deviation amount e _pf .

[0058] In FIGS. 7 and 8, the pressure basic deviation e _p, based on either the value of the thickness h and Doatsumi h setting the thickness h _s to the thickness deviation amount e _h of the resin molded product calculation The operation amount _un1p is calculated based on the corrected pressure deviation amount e _pf obtained by adding only the deviation correction amount δe _ph obtained by the above operation, and the value of the corrected pressure deviation amount e _pf is reduced based on the operation amount. As described above, a configuration in which the rotation speed n ₁ of the first-stage extruder driving motor 14 is controlled may be employed.

Referring to FIGS. 7 and 8, the first stage extruder driving motor drive speed controller 80B will be described in more detail. The pressure detector 82 that has detected the resin pressure near the entrance of the die 50 sends the detected pressure p _d to the deviation calculator 83 in the form of a pressure signal. Deviation computing unit 83, a pressure deviation e _p for setting the pressure P _ds pressure P _d is compared with the set pressure P _ds pressure P _d and the pressure setter 81 sent from the pressure detector 82 is set Calculation is performed, and the output is sent to the adder 213.

On the other hand, in FIG. 7 and FIG.
Temperature detector 10 for detecting the resin temperature near the inlet of the
2, a deviation amount calculator 1 based on the resin temperature t _d detected
03 temperature deviation e _t for setting the temperature T _s of the temperature t _d obtained by the calculation, the deviation calculator 103, and at the same time sent to the operation amount calculation unit 104, arithmetic unit via the input unit 211 It is also sent to 212. In this case, the temperature deviation e
The determination may be made via a determination unit for determining whether or not _t exceeds the limit. Computing device 212, the deviation correction amount based on the temperature deviation e _t [delta]
_Compute e _pt and send the output to adder 213. The adder 213, the pressure deviation e _p is the pressure base deviation e _p, the same pressure basic deviation e _p, by adding the deviation correction amount .delta.e _pt, and sends its output to the subsequent stage of the adder 223.

7 and 8, the thickness detector 152 which detects the thickness of the molded resin product discharged from the die 50 and detects the value of the detected thickness h of the molded resin product in the form of a thickness signal. It is sent to the deviation calculator 83A. Deviation calculator 83A, the thickness detector 152 from the sent thickness h and the thickness setter 151 by set set thickness h _s and compared with the thickness detector the thickness h sent from 152 thickness setter 1
Calculating a thickness deviation amount e _h for setting the thickness h _s set by 51, at the same time sends the output to the thickness control device 150 also sends to the computing device 222 via the input unit 221. In this case, the value of the thickness h of the resin molded product sent from the thickness detector 152 can be directly sent to the thickness control device 150 so that the thickness control device 150 can control the thickness of the resin molded product. The value of the thickness h of the resin molded product sent from the container 152 may be sent to the arithmetic unit 222 as it is, and the arithmetic unit 222 may perform the following arithmetic based on the value of the thickness h.

As shown in FIG. 7 and FIG.
Reference numeral 22 denotes the thickness deviation e sent from the deviation calculator 83A.
_The deviation correction amount δe _ph is calculated based on _h , and the output is sent to the adder 223. The adder 223 is the adder 2 in the preceding stage.
13 to a value the deviation correction amount .delta.e _pt obtained by adding to the pressure base deviation e _p, further by adding the deviation correction amount .delta.e _ph sent from the arithmetic unit 222 calculates a corrected pressure deviation e _pf,
The output is sent to the manipulated variable calculator 84. Operation amount calculator 8
4 calculates the manipulated variable u _N1P based on the correction pressure deviation e _pf sent from the adder 223, and sends its output to the motor speed control system 18. Motor speed controller 18, based on the sent from the operation amount calculation unit 84 manipulated variable u _N1P, so as to reduce the value of the correction pressure deviation e _pf, the rotation speed of the first stage extruder drive motor 14 Control n ₁ .

FIG. 18 shows the concept of calculation when calculating the correction amount based on the thickness deviation of the deviation amount of the pressure or the differential pressure in the in-line two-stage extruder of the present invention. In FIG. 18, for example, it is assumed that the operation _{is performed} with the discharge amount Q = Q ₀ , the measured value h = h _{0 of} the film thickness, and the discharge pressure p _d = p _d0 . Here, the thickness change [delta] _h has occurred. This corresponds to the increase δQ of the discharge amount Q from the hQ characteristic, which is the relationship between the thickness h and the discharge amount Q. On the other hand, the relationship Q〜 between the discharge amount Q and, for example, the discharge pressure p _d
From the p _d characteristic, this corresponds to an increase in δp _d . It determined the relationship between δh and δp _d by this relationship.

FIG. 19 is an explanatory diagram for explaining the main relationship among the deviation e, the manipulated variable u, and the control variable n in the in-line two-stage extruder of the present invention. In FIG. 19, since (deviation amount e) = (set value) − (measured value), e> 0.
Means that the control amount has not yet reached the set value. Therefore, in this case, the operation amount is made positive, and the motor rotation speed n as the control amount n is increased. However, when the motor rotation speed n is increased, the deviation e becomes smaller.
The operation amount u is gradually reduced. When e <0, the operation is the reverse of that when e> 0. Accordingly, the basic relationship between the operation amount u and the deviation amount e is as shown in FIG. Here, a large value of the temperature t means that
In the case of pressure control, this corresponds to a large pressure p, and in the case of differential pressure control, where a downstream temperature signal is used,
This corresponds to a small differential pressure Δp. Therefore, in the case of pressure control, the correction may be performed in the positive (+) direction.

7 and 8, it is assumed that the in-line two-stage extruder is operated at the set pressure P _ds and the set resin temperature T _S. In this state, it is assumed that there is disturbance such as clogging of the filter or change in the discharge amount such as temperature change of the input material, for example, disturbance due to clogging of the filter. In this case, because of the increased resistance of the connecting tube 30, 40 due to clogging of the filter, the discharge amount Q is reduced, the resin temperature t _d is about to rise. At this time, it detects the temperature t _d of the molten resin flowing through the connecting pipe 40 immediately before of the inlet of the outlet portion or the die 50 of the filter 60, on the basis of the deviation amount e _t of the set resin temperature T _s, the deviation _So that the quantity _et becomes zero
The temperature of the cylinder 22 of the second stage extruder 20 is lowered to prevent the resin temperature t _d from rising.

Further, in FIGS. 7 and 8, the pressure P _d at the outlet of the filter 60 or immediately before the inlet of the die 50 is detected, and a deviation e from the set pressure P _ds as the target pressure of the detected pressure P _d is detected. based on _p, the pressure detector 82 associated with the deviation e _p so becomes zero values, decrease of the discharge amount Q
The pressure loss between the first extruder and the outlet of the die 50 is compensated for, and the rotation speed n ₁ of the first-stage extruder driving motor 14 is increased to prevent the discharge amount Q from decreasing.

[0067] Incidentally, in FIGS. 7 and 8, despite the above-mentioned operations, the resin temperature detected by the temperature detector 102 t _d and set the resin temperature T _s which is the difference between the temperature deviation e _t Cannot be eliminated, a viscosity decrease corresponding to the temperature rise from the set resin temperature T _s is estimated based on the previously measured physical property data of the resin. the pressure to be achieved by estimating the changes or increase the set pressure P _s in the pressure.

7 and 8, the thickness h of the resin molded product such as a film or a sheet detected by the detector, the initial set pressure P _ds , the set resin when being operated at a temperature T _s, when the thickness deviation amount e _h for setting the thickness h _s of the thickness h of the film or resin molded product such as sheet occurs, discharge amount estimated from the thickness deviation amount e _h The set pressure P _dS is corrected so as to compensate for the change in Q, and the rotation speed n ₁ of the first-stage extruder drive motor 14 is changed. Even if the temperature of the resin flowing between the pressure detecting unit and the outlet of the die 50 fluctuates with time, the resin viscosity η corresponding to the resin temperature t _d and further the target viscosity calculated based on the viscosity η The set pressure P _ds is changed so as to correspond to the pressure loss between the pressure detector and the die outlet at the discharge amount Q.

[0069] Also, in FIGS. 7 and 8, so to correct the target pressure P _s on the basis of the thickness h of the resin molded product of a film or sheet or the like which is the final goal as described above,
There is no change in the discharge amount Q. Therefore, when the resin temperature t _d is constant and the pressure loss ΔP _d of the die 50 is constant, even if the resin temperature t _d fluctuates, the set pressure P _{ds is changed} to the set pressure P _d corresponding to the resin temperature t _{d. ds} , and further modifies the set pressure P _ds based on the final target thickness h of the resin molded product such as a film or a sheet to control the rotation speed n ₁ of the first-stage extruder drive motor 14. As a result, even when a large disturbance is generated, it is possible to control the discharge amount Q to be constantly and quickly kept constant with high accuracy.

FIG. 9 is an overall schematic configuration diagram of an in-line two-stage extruder according to a fifth embodiment of the present invention, and FIG. 10 is a control system explanatory diagram of the in-line two-stage extruder of FIG. 9 and 10, the in-line two-stage extruder includes a first-stage extruder driving motor drive speed controller 110 and a second-stage extruder temperature controller 100. The motor drive speed control device 110 for driving the first stage extruder includes a differential pressure setting unit set along the flow of the molten resin, for example, a differential pressure setting unit 90 set between an inlet and an outlet of the connection pipe 30. Set differential pressure ΔP _{1s of} differential pressure ΔP ₁ which is the pressure difference between two points detected in
Calculates the manipulated variable u _n1 △ _pf based on the difference pressure deviation amount e △ _p1 for, the manipulated variable u _n1 △ for the first stage extruder drive to reduce the value of on the basis of difference pressure deviation amount e △ _p1 to _pf The number of rotations n ₁ of the motor 14 is controlled.

In FIGS. 9 and 10, the second-stage extruder temperature controller 100 controls the temperature t _{d of} the resin detected by the resin temperature detector 102 provided in the resin temperature detector of the die 50 and the same. operation amount based on either the value of the temperature deviation e _t for the temperature of the set temperature u _H2T
Calculated, and controls the temperature of the second stage extruder so as to reduce the value of the temperature deviation e _t on the basis of the operation amount.

In FIG. 9 and FIG.
In the differential pressure measurement section A at 0, the first stage extruder 10 and the second stage
This is a section between the inlet and the outlet of the connecting pipe 30 that connects the step extruder 20 to each other. The control of the resin temperature t _d in the differential pressure measurement section A can be performed by, for example, the heater 92 and the heater output control device 91 that control the temperature of the connection pipe 30. At the outlet of the first-stage extruder 10, the resin has been substantially plasticized, so that the resin can be handled fluidly. However, since the length of the connection pipe 30 is short, in order to generate a predetermined differential pressure, for example, as shown in FIG.
And the temperature of the connection pipe 30 is maintained at a constant temperature by the heater 92 and the heater output control device 91 as described above.

However, the size of the cross section of the pressure measurement section A may be the size of the cross section of the connection pipe 30 as it is, or as described above, the restriction 93 such as the orifice.
May be made smaller than the diameter of the connection pipe 30. Further, a network body, that is, a resistor such as a mesh may be put in the connection pipe 30.

9 and 10, the differential pressure detector 1
The 12 inlet pressure detectors 1121 detect the pressure at the inlet of the connection pipe 30 and send the output to the differential pressure calculator 1123. Also, the outlet pressure detector 1122 of the differential pressure detector 112
Detects the pressure at the outlet of the connection pipe 30 and sends the output to the differential pressure calculator 1123. The differential pressure calculator 1123 calculates the connection pipe inlet pressure sent from the inlet pressure detector 1121,
The differential pressure ΔP ₁ between the pressure at the connection pipe outlet and the pressure sent from the outlet pressure detector 1122 is calculated, and the output is sent to the differential pressure deviation calculator 113.

In FIG. 9 and FIG. 10, the differential pressure deviation amount calculator 113 receives the differential pressure △ sent from the differential pressure calculator 1123.
P ₁ and the set differential pressure △ P _1s sent from the differential pressure setting device 111
Preparative by comparing the calculated difference pressure deviation amount e △ _p1 for set differential pressure △ P _1s of the differential pressure △ P _1, and sends its output to the differential pressure manipulated variable calculator 114. Differential pressure manipulated variable calculator 114 calculates the operation amount u _n1 △ _p1 based on a difference pressure deviation amount e △ _p1 sent from the difference pressure deviation amount calculator 113, and sends its output to the motor speed control system 18 . Motor speed controller 18, based on the operation amount u _n1 △ _p1 transmitted from the differential pressure manipulated variable calculator 114,
So as to reduce the value of the difference pressure deviation amount e △ _p1, controls the rotational speed n ₁ of the first stage extruder drive motor 14.

On the other hand, in FIG. 9 and FIG.
Resin temperature detector 1 for detecting the resin temperature near the entrance of zero
02 sends the temperature t _d of the detected resin in the form of a temperature signal to the deviation calculator 103. Deviation computing unit 103 compares the set temperature T _s temperature t _d and a temperature setter 101 of the resin sent from the resin temperature detector 102 is set, the temperature deviation with respect to the set temperature T _s of the temperature t _d e _t is calculated, and the output is sent to the manipulated variable calculator 104. The operation amount calculator 104 is
Deviation computing unit based on the temperature deviation amount e _t sent from 103 calculates the operation amount u _H2T, sends its output to the heater output control device 26. The heater output control device 26 controls the heater 23 based on the operation amount u _h2t sent from the operation amount calculator 104.
Controls heat output q _2, through the control of the heat output q ₂ of the heater 23, so as to reduce the value of the temperature deviation e _t, second
The temperature of the cylinder 22 of the step extruder 20 is controlled.

In FIGS. 9 and 10, the temperature detector 1
Detected by 02 the The resin temperature t _d, may be employed a weighted average value of the detected value detected by, for example, a plurality of temperature detectors. According to series two-stage extrusion apparatus shown in FIGS. 9 and 10, a temperature deviation amount e _t for setting the resin temperature T _s of the detected temperature t _d, 2 one pressure detector 1
The differential pressure ΔP ₁ between the pressures detected by 121 and 1222
Differential pressure ΔP _1s set by the differential pressure setting device 111 of
The rotational speed of the first-stage extruder drive motor 14 can be controlled by the motor rotational speed control device 18 based on two deviation amounts from the differential pressure deviation amount e △ _p1 with respect to. Also,
The rotational speed controller 18, by feeding back the thickness deviation amount e _h for setting the thickness h _s of the thickness h of the resin molded product of a film or sheet or the like which is detected by the thickness detector of the resin molded product of a film or sheet, etc. Is also good.

9 and 10, it is assumed that the in-line two-stage extruder is operated at the set pressure P _ds and the set resin temperature T _s . In this state, it is assumed that there is a disturbance that changes the discharge amount Q such as filter clogging or a change in the temperature of the input material, for example, disturbance due to filter clogging. In this case, since the resistance of the connection pipe 30 due to the clogging of the filter increases, the discharge amount Q decreases, and the resin temperature t _d
Tries to rise. At this time, the temperature of the molten resin flowing in the connection pipe 30 is detected on the upstream side of the differential pressure measurement section A and on the downstream side of the differential pressure measurement section A. However, at this time, the wall surface of the differential pressure measurement section A is always kept at a constant temperature.

[0079] Here, to detect the respective pressure downstream of the upstream differential pressure measuring section A of the differential pressure measuring section A, the difference pressure deviation amount with respect to their set pressure difference of the pressure difference △ P ₁ △ P _1s e
Δ The first stage extruder driving motor 1 is set so that _p1 becomes zero.
4 by increasing the rotational speed n _1, to prevent a decrease in discharge amount Q. At this time, if there is a temperature deviation amount e _t for setting the resin temperature T _s of the resin temperature t _d detected by the temperature detector 102 on the basis of the physical property data of the resin measured in advance, setting the resin temperature T Estimate the decrease in viscosity corresponding to the temperature rise from _s, and determine the pressure on the upstream side of the differential pressure measurement section A and the downstream of the differential pressure measurement section A when the target discharge rate Q is achieved at the expected viscosity. estimating the pressure difference △ P ₁ between the pressure side, the rotational speed n ₁ of the set differential pressure △ P _1s a change or increase in the differential pressure, further first stage extruder drive motor 14
To rise.

In FIGS. 9 and 10, even if the temperature t _{d of the} resin flowing in the differential pressure measurement section A fluctuates with time, the set differential pressure ΔP _1s is changed to the resin viscosity η corresponding to the resin temperature t _d . Further, the differential pressure ΔP ₁ between the pressure on the upstream side of the differential pressure measurement section A and the pressure on the downstream side of the differential pressure measurement section A at the time of the target discharge amount Q calculated based on the viscosity η. Change to
There is no change in the resin discharge amount Q. Therefore, as described above, while maintaining the temperature of the differential pressure measurement section A constant, the differential pressure ΔP ₁ between the pressure on the upstream side of the differential pressure measurement section A and the pressure on the downstream side of the differential pressure measurement section A is maintained. And the resin temperature t _d
Is changed to a set differential pressure ΔP _1s corresponding to the resin temperature t _d, and by controlling the rotation speed n ₁ of the first-stage extruder drive motor 14, even a large disturbance can be obtained. In addition, it is possible to control the discharge amount Q to be kept constant with high accuracy.

FIG. 11 is an overall schematic configuration diagram of an in-line two-stage extruder according to a sixth embodiment of the present invention, and FIG.
It is a control system explanatory drawing of 1 serial two-stage extrusion apparatus. FIG.
In the in-line two-stage extruder shown in FIG. 12, the differential pressure setting unit is set in a section between the inlet and the outlet of the second-stage extruder 20. The first stage extruder driving motor drive speed control device 120 sets the differential pressure Δp ₂ detected in the differential pressure setting section set in the section between the inlet and the outlet of the second stage extruder 20. It calculates the difference pressure deviation amount e △ operation amount based on _p2 u _n1 △ _p2 for the pressure difference △ P _2s, the manipulated variable u
so as to reduce the value of the basis difference pressure deviation amount e △ _p2 to _n1 △ _p2 controlling the rotational speed n ₁ of the first stage extruder drive motor 14.

That is, in FIGS. 11 and 12,
The inlet pressure detector 1221 of the differential pressure detector 122
The pressure at the inlet of the cylinder 22 of the step extruder 20 is detected,
The output is sent to the differential pressure calculator 1223. The outlet pressure detector 1222 of the differential pressure detector 122 detects the pressure at the outlet of the cylinder 22 of the second stage extruder 20 and sends the output to the differential pressure calculator 1223. Differential pressure calculator 1223 includes an inlet portion pressure of the cylinder 22 sent from the inlet pressure detector 1221, the differential pressure △ P ₂ between the outlet portion pressure of the cylinder 22 sent from the outlet pressure detector 1222 operation Then, the output is sent to the differential pressure deviation amount calculator 123.

In FIG. 9 and FIG. 10, the differential pressure deviation amount calculator 123 receives the differential pressure △ transmitted from the differential pressure calculator 1223.
P ₂ and the set differential pressure △ P _2s sent from the differential pressure setting device 121
Preparative by comparing the calculated difference pressure deviation amount e △ _p2 for set differential pressure △ P _2s differential pressure △ P _2, and sends its output to the differential pressure manipulated variable calculator 124. Differential pressure manipulated variable calculator 124 calculates the operation amount u _n1 △ _p2 based on the difference pressure deviation amount e △ _p2 sent from the difference pressure deviation amount calculator 123, and sends its output to the motor speed control system 18 . Motor speed controller 18, based on the operation amount u _n1 △ _p2 transmitted from the differential pressure manipulated variable calculator 124,
So as to reduce the value of the difference pressure deviation amount e △ _p2, controls the rotational speed n ₁ of the first stage extruder drive motor 14.

In FIGS. 11 and 12, the second-stage extruder temperature controller 100 sets the resin temperature t _d detected by the resin temperature detector 102 provided in the resin temperature detector of the die 50 and the same temperature setting. Temperature deviation e _{t with} respect to temperature t _s
Either based on one of the values to calculate the manipulated variable u _H2T, that controls the temperature of the second stage extruder so as to reduce the value of the temperature deviation e _t based on the operation amount u _H2T of, FIG.
This is the same as the case of the in-line two-stage extruder shown in FIG.

As described above, the differential pressure control in the in-line two-stage extruder shown in FIGS. 11 and 12 uses the differential pressure between the inlet and outlet of the cylinder 22 of the second-stage extruder 20. It is done. The temperature control device in the differential pressure measurement section
The heater output control device 26 is a temperature control device for controlling the temperature of the cylinder 22 of the step extruder 20. In the cylinder 22 of the second-stage extruder, the temperature control is stabilized and the temperature is in the process of increasing the temperature, so that the pressure difference ΔP ₁ can be controlled to be sufficiently large and stable.

In FIGS. 11 and 12, the pressure at the inlet of the second stage extruder 20 is detected by the pressure detector 1221, while the rotation speed n ₂ of the second stage extruder drive motor 24 is kept constant. The pressure at the outlet of the second stage extruder 20 is detected by a pressure detector 1222. At the same time, a temperature detector for detecting the temperature of the molten resin is installed at each of the inlet and the outlet of the second-stage extruder 20, and the temperatures of the molten resin are detected. As a setting resin temperature T _s of one value or average value of the temperature is set by the temperature setting device 101, the second-stage extruder 20 cylinder 22
The temperature of the cylinder 22 of the second-stage extruder 20 is controlled via a heater output control device 26 and a heater 23 which are temperature control devices.

[0087] In FIGS. 11 and 12, serial two-stage extrusion apparatus, the set pressure P _2s, and is operated at set resin temperature T _s. Here, it is assumed that there is a disturbance that changes the discharge amount Q such as clogging of the filter or temperature change of the input material, for example, clogging of the filter 60. in this case,
Due to an increase in the resistance of the conduit, that is, the connecting pipe 30 due to the clogging of the filter, the discharge rate decreases and the resin temperature tends to increase.

At this time, in FIG. 11 and FIG.
Among the values of the temperature detector 102 for detecting the temperature of the inlet and outlet of the second stage extruder 20, the temperature deviation e _t for setting the resin temperature T _s of the average value of one value or both values
, So that the temperature deviation _et becomes zero.
Furthermore detects respective pressures of the inlet and outlet of the second stage extruder 20, based on the difference pressure deviation amount e △ P ₂ for set differential pressure △ P _2s differential pressure △ P ₂ between those pressure, as the difference pressure deviation amount e △ P ₂ is zero value, by controlling the rotational speed n ₁ of the first stage extruder drive motor 14, to prevent a decrease in discharge amount Q.

By the way, in FIG. 11 and FIG.
Despite the above operation, the resin temperature t _d detected by the temperature detector 102, for example, the temperature deviation amount of the average value of one of the detected values or both of the detected values of the detector 102 with respect to the set resin temperature T _s when e _t is not zero value, the target in the viscosity previously measured on the basis of the physical property data of the resin had been to estimate the viscosity decreased amount commensurate with the temperature rise from the setting resin temperature T _s, it is expected as the discharge amount Q of the achieved the second stage extruder 20 of the inlet pressure and the outlet portion the estimated differential pressure of the differential pressure △ P ₂ estimated to set differential pressure △ P _2s between pressure Change or increase. further,
The rotational speed n ₁ of the first stage extruder drive motor 14 is accelerated. Even if the temperature of the resin flowing through the cylinder 22 of the second stage extruder 20 fluctuates with time, the set differential pressure ΔP _2s is _calculated based on the resin viscosity η corresponding to the resin temperature t _d and further based on the viscosity η. Since the pressure difference between the inlet and the outlet of the second stage extruder 20 at the time of the calculated target discharge amount Q is changed to be equal to ΔP _2, there is no change in the discharge amount Q.

Therefore, as described above, in FIGS. 11 and 12, the cylinder 2 of the second-stage extruder 20 is maintained while the rotation speed _n2 of the second-stage extruder drive motor 24 is kept constant.
When the resin temperature of the two parts is kept constant and the pressure difference ΔP ₂ between the inlet and the outlet of the second stage extruder 20 is kept constant, even if the resin temperature t _d fluctuates, the set pressure difference ΔP by controlling the rotational speed n ₁ of the resin temperature t by changing the target pressure difference commensurate with the _d first stage extruder drive motor 14 P2s, even for large disturbance, constant discharge amount with high precision Can be controlled to keep.

FIG. 13 is an overall schematic configuration diagram of an in-line two-stage extruder according to a seventh embodiment of the present invention, and FIG.
FIG. 3 is an explanatory diagram of a control system of a serial two-stage extruder 3. FIG.
14 includes a first-stage extruder driving motor drive speed control device 120A and a second-stage extruder temperature control device 100. The motor drive speed control device 120A for driving the first-stage extruder has a differential pressure deviation amount e △
Let _p1 be the basic differential pressure e △ _p, and the basic differential pressure e 偏差_p
The deviation correction amount obtained by the calculation based on either the value of the temperature deviation e _t for the temperature t _d and the same temperature of the set temperature T _s of the resin the resin temperature detector 102 detects .delta.e △ _p2t calculates the manipulated variable u _n1 △ _p2 based on obtained by adding corrected difference pressure deviation amount e △ _p2f a, so as to reduce the value of the corrected differential pressure deviation amount e △ _p2f based on the operation amount first stage The rotation speed n ₁ of the extruder driving motor 14 is controlled.

At the same time, the second-stage extruder temperature controller 100
Calculates the manipulated variable u _H2T based on either the value of the temperature deviation amount e _t of the resin the resin temperature detector 102 detects for the temperature t _d and the temperature setting temperature T _d of the operation amount u controlling the temperature of the second stage extruder 20 so as to reduce the value of the temperature deviation e _t based on _H2T.

That is, in FIGS. 13 and 14,
The inlet pressure detector 1221 of the differential pressure detector 122 is
The pressure at the inlet of the cylinder 22 of the step extruder 20 is detected,
The output is sent to the differential pressure calculator 1223. The outlet pressure detector 1222 of the differential pressure detector 122 detects the pressure at the outlet of the cylinder 22 of the second stage extruder 20 and sends the output to the differential pressure calculator 1223. The differential pressure calculator 1223 is
Further, a differential pressure ΔP ₂ between the inlet pressure of the cylinder 22 sent from the inlet pressure detector 1221 and the outlet pressure of the cylinder 22 sent from the outlet pressure detector 1222 is calculated, and the output is calculated. The difference is sent to the differential pressure difference calculator 123.

In FIG. 13 and FIG. 14, the differential pressure deviation calculator 123 includes a differential pressure ΔP ₂ sent from the differential pressure calculator 1223 and a set differential pressure ΔP sent from the differential pressure setter 121.
By comparing the _2s calculates the difference pressure deviation amount e △ _p2 for set differential pressure △ P _2s differential pressure △ P _2, and sends its output to the adder 313.

On the other hand, in FIG. 13 and FIG.
The resin temperature detector 102 for detecting the resin temperature at the inlet and outlet of the cylinder 22 of the step extruder 20, for example, sends the detected resin temperature t _d to the deviation calculator 103 in the form of a temperature signal. Deviation computing unit 103 compares the temperature t _d of the resin sent from the resin temperature detector 102, and a setting temperature T _s temperature setter 101 is set, the temperature deviation for the set temperature T _s of the temperature t _d computes the amount e _t, the output sent to the operation amount calculation unit 104 at the same time, the input unit 311
Is also sent to the arithmetic unit 312 via. Arithmetic unit 312
Calculates a deviation correction amount .delta.e △ _P2t based on the temperature deviation e _t sent from the deviation calculator 103, and sends its output to the adder 313. In addition, the resin temperature t _d sent from the resin temperature detector 102 is sent to the arithmetic unit 312 as it is,
The arithmetic unit 312 may calculate the deviation correction amount δe △ _P2t based on the resin temperature t _d sent from the resin temperature detector 102 and send the output to the adder 313.

Referring to FIG. 13 and FIG.
3, the difference pressure deviation amount e △ _p2 and the difference圧基present deviation e △ _p2, the same difference圧基present deviation e △ _p2, corrected by adding the sent from the arithmetic unit 312 deviation correction amount .delta.e △ _P2T The differential pressure deviation e △ _p2f is calculated, and the output is sent to the manipulated _variable calculator 124. Manipulated variable calculator 124 calculates the operation amount u _n1 △ _p2 based on the sent from the adder 313 corrected differential pressure deviation amount e △ _p2f, sends its output to the motor speed control system 18. Motor speed controller 18, based on the operation amount u _n1 △ _p2 sent from the operation amount calculation unit 124, the correction difference pressure deviation amount e △ _p2f
So that the value of the first stage extruder driving motor 1
Controlling the rotational speed n ₁ of 4.

FIG. 15 is an overall schematic configuration diagram of an in-line two-stage extruder according to an eighth embodiment of the present invention, and FIG.
FIG. 5 is an explanatory diagram of a control system of an in-line two-stage extrusion device No. 5; FIG.
16 includes a first-stage extruder driving motor drive speed control device 120B and a second-stage extruder temperature control device 100. The motor drive speed control device 120B for driving the first-stage extruder drives the differential pressure deviation e △ _p
Is the basic differential pressure e △ _p, and the basic differential pressure e 偏差_p
The deviation correction amount obtained by the calculation based on either the value of the temperature deviation e _t for the temperature t and the temperature of the set temperature resin temperature detector 102 detects .delta.e △ _P2T
And the deviation correction amount δe △ _p2h obtained by calculating based on one of the thickness h and the thickness deviation amount e _{h with} respect to the set thickness of the thickness _h. calculates the manipulated variable u _N1P based on e △ _p2f, controls the rotational speed n ₁ of the first stage extruder drive motor 14 so as to reduce the value of the correction difference pressure deviation amount e △ _p2f based on the operation amount .

[0098] The first stage extruder drive motor drive speed control device 120B may also simply the difference pressure deviation amount e △ _p and the difference圧基present deviation e △ _p, the same difference圧基present deviation e △ _p, deviation correction amount .delta.e △ corrected differential _{pressure p2h} obtained by adding the obtained by the calculation based on either the value of the thickness deviation amount e _h for the thickness set value of the thickness h and the thickness of the resin molded product deviation e △ calculates the manipulated variable u _n1 △ _p based on _p2f, rotational speed n of the first stage extruder drive motor 14 so as to reduce the value of the correction difference pressure deviation amount e △ _p2f based on the operation amount _One can also be configured to control.

15 and 16, the inlet pressure detector 1221 of the differential pressure detector 122 is connected to the second stage extruder 20.
The pressure at the inlet of the cylinder 22 is detected, and the output is sent to the differential pressure calculator 1223. The outlet pressure detector 1222 of the differential pressure detector 122 detects the pressure at the outlet of the cylinder 22 of the second stage extruder 20 and sends the output to the differential pressure calculator 1223. Differential pressure calculator 1223 further inlet pressure detector and inlet pressure of the cylinder 22 sent from 1221, the differential pressure △ P ₂ between the outlet portion pressure of the cylinder 22 sent from the outlet pressure detector 1222 And sends the output to the differential pressure deviation amount calculator 123.

In FIG. 15 and FIG. 16, the differential pressure deviation amount calculator 123 includes a differential pressure ΔP ₂ sent from the differential pressure calculator 1223 and a set differential pressure ΔP sent from the differential pressure setter 121.
By comparing the _2s calculates the difference pressure deviation amount e △ _p2 for set differential pressure △ P _2s differential pressure △ P _2, and sends its output to the adder 313.

On the other hand, in FIG. 15 and FIG.
The resin temperature detector 102 for detecting the resin temperature at the inlet and outlet of the cylinder 22 of the step extruder 20, for example, sends the detected resin temperature t _d to the deviation calculator 103 in the form of a temperature signal. Deviation computing unit 103 compares the temperature t _d of the resin sent from the resin temperature detector 102, and a setting temperature T _s temperature setter 101 is set, the temperature deviation for the set temperature T _s of the temperature t _d computes the amount e _t, the output sent to the operation amount calculation unit 104 at the same time, the input unit 311
Is also sent to the arithmetic unit 312 via. Arithmetic unit 312
Calculates a deviation correction amount .delta.e △ _P2t based on the temperature deviation e _t sent from the deviation calculator 103, and sends its output to the adder 313. In addition, the resin temperature t _d sent from the resin temperature detector 102 is sent to the arithmetic unit 312 as it is,
The arithmetic unit 312 may calculate the deviation correction amount δe △ _P2t based on the resin temperature t _d sent from the resin temperature detector 102 and send the output to the adder 313.

In FIG. 15 and FIG.
3, the difference pressure deviation amount e △ _p2 and the difference圧基present deviation e △ _p2, the same difference圧基present deviation e △ _p2, corrected by adding the sent from the arithmetic unit 312 deviation correction amount .delta.e △ _P2T The differential pressure deviation e △ _p2t is calculated, and the output is sent to the adder 323 at the _subsequent stage.

In FIGS. 15 and 16, a thickness detector 152 that detects the thickness of the molded resin product discharged from the die 50 and detects the value of the detected thickness h of the molded resin product in the form of a thickness signal. It is sent to the deviation calculator 153. Deviation calculator 153, the thickness detector 152 is set by the thickness h and the thickness setter 151 sent from the set thickness h _s and compared with the thickness detector the thickness h sent from 152 thickness setter 151 calculating a thickness deviation amount e _h for setting the thickness h _s set by the operation amount calculation unit 154 and its output
And to the arithmetic unit 322 via the input means 321 at the same time. In this case, the value of the thickness h of the resin molded product sent from the thickness detector 152 is directly sent to the thickness control device 160 via the manipulated variable calculator 154, and the thickness control device 160 controls the thickness of the resin molded product. In addition to the thickness detector 152
It is also possible to send the value of the thickness h of the resin molded product sent from the computer to the arithmetic unit 322 as it is, and to cause the arithmetic unit 222 to perform the following calculation based on the value of the thickness h.

[0104] As shown in FIGS. 15 and 16, arithmetic unit 322 calculates a deviation correction amount .delta.e △ _P2H based on the thickness deviation amount e _h sent from deviation calculator 153, the adder 323 and the output Send to The adder 323 is configured such that the adder 313 in the preceding stage adds the deviation correction amount δe _pt to the pressure basic deviation amount e _p.
Is added to the deviation correction amount δe △ _p2h sent from the arithmetic unit 322 to obtain a corrected pressure deviation amount e △
_p2f is calculated, and the output is sent to the manipulated _variable calculator 124.
Manipulated variable calculator 124 calculates the operation amount u _n1 △ _p based on the sent from the adder 323 corrected pressure deviation e △ _p2f, sends its output to the motor speed control system 18. Motor speed controller 18, based on the operation amount u _n1 △ _p sent from the operation amount calculation unit 124, the correction pressure deviation e △ _p2f
So that the value of the first stage extruder driving motor 1
Controlling the rotational speed n ₁ of 4.

As described above, the pressure and the temperature of the molten resin at the entrance of the die 50 are simultaneously controlled by the feedback control, so that the pressure and the temperature of the corresponding portions are simultaneously kept constant. The die 50 is a kind of orifice for the flow of the molten resin, and the outlet pressure is constant at the atmospheric pressure. Therefore, the differential pressure before and after the orifice is constant. If the pressure and temperature at the inlet of the die 50 are fixed, the viscosity of the resin is kept constant, and the discharge amount is constant. as a result,
Even when the following disturbance that changes the amount of resin discharged from the die 50 occurs, the discharge amount Q of the resin discharged from the die 50 is maintained at a predetermined amount with high accuracy.

In FIGS. 15 and 16, when, for example, the filter 60 of the in-line two-stage extruder of the present invention is clogged and the discharge amount Q decreases, the resin temperature increases and the pressure decreases.
At this time, the temperature of the resin is lowered by the temperature control device of the cylinder of the second stage extruder. On the other hand, the rotation speed of the motor 14 for driving the first-stage extruder increases, the amount of resin fed increases, and the pressure increases. As a result, the pressure and temperature of the molten resin at the entrance of the die 50 are kept constant, and the discharge amount Q is kept constant with high accuracy.

When the temperature of the charged resin decreases, the die 5
The temperature at the outlet of 0 decreases and the pressure increases. At this time, the cylinder temperature controller increases the amount of heating to increase the temperature of the resin. On the other hand, the first stage extruder drive motor drive speed control device 120A, the pressure from decreasing the feed rate of the resin by lowering the rotational speed n ₁ of the motor 14 is reduced.
As a result, the pressure and temperature of the molten resin at the entrance of the die 50 are kept constant, and the discharge amount is kept constant with high accuracy.

[0108] According to the series 2 stage extruder of the present invention, the temperature deviation correction amount computing unit 212, 312 calculates and outputs the pressure deviation correction amount .delta.e _pt based on the temperature and viscosity characteristics of the resin. Thickness deviation correction amount computing unit 222 and 322, the pressure difference based on the thickness deviation amount e _h and the pressure characteristics of the molded product compensation deviation .delta.e _ph, calculates and outputs .delta.e △ p _2h. The deviation amount calculating device calculates such that at least one of these deviation correction amounts is added to the basic deviation amount. The operation amount calculation device calculates the operation amount based on the final deviation amount.

In the above description, even when control is performed using differential pressure ΔP ₂ generated by boosting, or when control is performed using differential pressure ΔP ₁ generated by pressure loss, However, it is obvious that the resin discharge amount Q is determined by the differential pressure ΔP.

The temperature and viscosity characteristics of the resin are such that the viscosity decreases as the temperature increases. A decrease in viscosity increases the discharge rate, which means an increase in pressure. That is, when the temperature of the resin rises or the amount of temperature deviation of the resin increases positively, the viscosity of the resin decreases, so that the discharge amount increases. This has a certain relationship with the increase in the pressure deviation on the positive side. When the temperature of the resin decreases or the temperature deviation of the resin increases negatively, the viscosity of the resin increases, so that the discharge amount decreases. This has a certain relation with the pressure deviation increasing to the negative side.

As described above, the final deviation amount added to the basic deviation amount with respect to the set pressure value is evaluated in the direction of increasing the pressure deviation amount, and has the effect of increasing the output of the manipulated variable. Increase the pressure control gain and increase the accuracy of pressure control.

The thickness of the molded product is directly related to the discharge amount of the resin. If the winding speed and width of the resin molded product are constant, a positive increase in the thickness deviation is related to a positive increase in the discharge amount,
The pressure deviation has a positively increased relationship. On the other hand, the negative increase in the thickness deviation is related to the negative increase in the discharge amount, and the pressure deviation is negatively increased. If the thickness deviation correction amount is added to the basic deviation amount, the same operation as described above is performed, and the accuracy of pressure control is increased.

Since both the temperature deviation correction amount and the thickness deviation correction amount operate simultaneously as the pressure deviation correction amount, they can be added simultaneously. In that case, the gain increases additively. It can be seen that the temperature deviation correction amount can be performed on the basis of the temperature or on the basis of the temperature deviation amount, since it is the same when considered on the coordinates of the temperature.

[0114]

According to the in-line two-stage extruder of the present invention, the following effects can be obtained. (1) A first-stage extruder 10 driven by a first-stage extruder drive motor 14 to extrude a molten resin, and a melt extruded from an outlet of the first-stage extruder 10 and sent through a connection pipe 30. A second-stage extruder 20 driven by a second-stage extruder motor 24 to extrude the resin, and a molten resin connected to an outlet of the second-stage extruder 20 and extruded from the second-stage extruder 20 A two-stage extruder for molding a resin molded product having a die 50 for discharging a resin, wherein a pressure with respect to a set pressure of a pressure detected by a pressure detector for detecting a resin pressure near an inlet of the die 50 is provided. based on the deviation e _p calculates the manipulated variable u _N1P, controls the rotational speed n ₁ of the first stage extruder drive motor 14 so as to reduce the value of the pressure deviation e _p based on the operation amount A motor drive speed control device 80 for driving the first stage extruder; Calculates the manipulated variable u _H2T based on the temperature deviation e _t for the set temperature of the temperature t _d of the resin the resin temperature detector for detecting a resin temperature of an inlet portion near Lee 50 detects, the temperature on the basis of the manipulated variable since a second stage extruder temperature controller 100 for controlling the temperature of the resin passage wall of the second stage extruder so as to reduce the value of the deviation e _t, the plasticized molten resin Even if the viscosity changes due to the temperature change, the discharge amount of the resin can be kept constant with high accuracy, and a molded product having a uniform thickness can be obtained. (2) the first stage extruder drive motor drive speed control device 80, the pressure deviation e _p is the pressure base deviation e _p,
The same pressure basic deviation e _p, deviation correction the resin temperature detector obtained by a calculation based on either the value of the temperature deviation e _t for setting the temperature of the detected temperature t _d and the same temperature calculates the manipulated variable u _N1P based on the correction pressure deviation e _pf obtained by adding the amount .delta.e _pt, the corrected pressure deviation e _pf the first stage extruder to the value to small based on the operation amount Since it is configured as a first-stage extruder motor driving speed control device 80A for controlling the rotation speed n ₁ of the driving motor 14, the pressure deviation amount of the resin discharge pressure with respect to the set pressure is determined by the temperature of the molten resin and the temperature of the molten resin. The discharge amount of the resin can be controlled based on a value corrected by a correction deviation amount corresponding to one of the temperature deviation amounts with respect to the set temperature of the same temperature, and the temperature change of the plasticized molten resin can be controlled. Changes in viscosity associated with Always with high accuracy can hold the discharge amount of the resin constant, it is possible to obtain a uniform molded product having a thickness (claim 2). (3) the first stage extruder drive motor drive speed control device 80, the pressure deviation e _p is the pressure base deviation e _p,
The same pressure basic deviation e _p, deviation correction amount obtained by the calculation based on either the value of the thickness deviation amount e _h for setting the thickness of the thickness h and the thickness of the resin molded product δe
manipulated _variable u based on the corrected pressure deviation e _pf obtained by adding _ph
n _1p is calculated, and the corrected pressure deviation amount e is calculated based on the operation amount.
_Since the first stage extruder drive motor drive speed control device 80 is configured to control the rotation speed n ₁ of the first stage extruder drive motor 14 so as to reduce the value of _pf , the resin discharge pressure The amount of pressure deviation with respect to the set pressure, the discharge amount of the resin based on the value corrected by the correction deviation amount according to one of the thickness deviation amount with respect to the thickness of the resin molded product and the set thickness of the same thickness It can be controlled, and even if there is a change in viscosity due to a change in temperature of the plasticized molten resin, the discharge amount of the resin can be kept constant with high accuracy, and a molded product with a uniform thickness can be obtained. (Claim 3). (4) The first stage extruder drive motor drive speed control device 80, the pressure deviation e _p is the pressure base deviation e _p,
The same pressure basic deviation e _p, deviation correction the resin temperature detector obtained by a calculation based on either the value of the temperature deviation e _t for setting the temperature of the detected temperature t _d and the same temperature the amount .delta.e _pt, by adding the deviation correction amount .delta.e _ph obtained by a calculation based on either the value of the thickness deviation amount e _h for setting the thickness of the thickness h and the thickness of the resin molded product The manipulated _variable u is based on the obtained corrected pressure deviation amount e _pf.
n1p, and calculates the corrected pressure deviation amount e based on the operation amount.
_Since the first stage extruder drive motor drive speed control device 80 is configured to control the rotation speed n ₁ of the first stage extruder drive motor 14 so as to reduce the value of _pf , the resin discharge pressure The amount of pressure deviation with respect to the set pressure is the temperature of the molten resin and the amount of correction deviation according to one of the temperature deviation amounts with respect to the set temperature of the same temperature, and the thickness of the resin molded product and the set thickness of the same thickness It is possible to control the discharge amount of the resin based on the value corrected by the correction deviation amount according to one of the thickness deviation amounts with respect to the thickness deviation amount, the viscosity of the plasticized molten resin with a temperature change Even if there is a change, the discharge amount of the resin can always be kept constant with high accuracy, and a molded product having a uniform thickness can be obtained. (5) A first-stage extruder 10 driven by the first-stage extruder drive motor 14 to extrude the molten resin, and a melt extruded from the outlet of the first-stage extruder 10 and sent through the connection pipe 30. A second-stage extruder 20 driven by a second-stage extruder motor 24 to extrude the resin, and a molten resin connected to an outlet of the second-stage extruder 20 and extruded from the second-stage extruder 20 A two-stage extruder for forming a resin molded product having a die 50 for discharging a pressure difference, wherein a set pressure difference Δp ₁ detected in a pressure difference setting section set along the flow of the molten resin. Manipulated variable u based on differential pressure deviation e に 対 す る_p1
n1 △ _p1 is calculated and the difference pressure deviation amount e on the basis of the manipulated variable
△ the first stage extruder drive motor drive speed control device 110, 120 for controlling the rotational speed n ₁ of the first stage extruder drive motor 14 so that the value to reduce the _p1, the die 5
Resin temperature detector 1 for detecting the resin temperature near the entrance of zero
02 calculates the manipulated variable u _H2T based on either the value of the temperature deviation e _t for the set temperature of the temperature t _d and the same temperature of the resin was detected, the temperature deviation e _t on the basis of the manipulated variable And a second-stage extruder temperature control device 100 for controlling the temperature of the resin passage wall of the second-stage extruder so as to reduce the value of the molten resin. The difference in pressure difference between the set pressure difference of the pressure difference and the temperature of the molten resin and the value of the temperature difference with respect to the set temperature of the same temperature are corrected based on a value corrected by a correction value corresponding to one of the values. Discharge rate can be controlled, and even if viscosity changes due to temperature change of plasticized molten resin, resin discharge rate can be kept constant with high accuracy and uniform thickness molding A product can be obtained (claim 5). (6) The motor drive speed control device 120 for driving the first-stage extruder converts the differential pressure deviation e △ _p1 into the differential pressure basic deviation e △
and _p, the same difference圧基present deviation e △ _p, based on either the value of the temperature deviation e _t for the temperature t _d and the same temperature of the set temperature of the resin the resin temperature detector 102 detects based on the deviation obtained by the calculation correction amount .delta.e △ correction difference obtained by adding the _p2t pressure deviation amount e △ _p2f calculates the manipulated variable u _n1 △ _p2, the corrected differential pressure deviation amount e on the basis of the manipulated variable △ _p2f
Is configured as a first-stage extruder drive motor drive speed control device 120A that controls the rotation speed n ₁ of the first-stage extruder drive motor 14 so as to reduce the value of the second-stage extruder temperature control. The apparatus 100 includes the resin temperature detector 10
2 calculates the manipulated variable u _P2T based on either the value of the temperature deviation e _t for the set temperature of the temperature t _d and the same temperature of the resin was detected, the temperature deviation e _t on the basis of the manipulated variable Is configured as a second-stage extruder temperature control device 100 that controls the temperature of the resin passage wall of the second-stage extruder so as to reduce the value of the molten resin. The differential pressure deviation amount with respect to the set differential pressure of the differential pressure is based on a value corrected by a correction deviation amount corresponding to one of the temperature of the molten resin and the temperature deviation amount with respect to the same set temperature. The driving speed of the motor for driving the one-stage extruder can be controlled, and at the same time, the second-stage extruder can be controlled in accordance with one of the temperature of the molten resin and the temperature deviation from the set temperature. The temperature of the resin passage wall Even if there is a change in viscosity due to the temperature change of the plasticized molten resin, it is possible to always keep the discharge amount of the resin constant with high accuracy and obtain a molded product with uniform thickness (Claim 6). (7) The motor drive speed control device 120 for driving the first stage extruder converts the differential pressure deviation amount e △ _p into the differential pressure basic deviation amount e △
_p , the thickness difference e with respect to the thickness h of the resin molded product and the thickness set value of the same thickness is added to the same differential pressure basic deviation e △ _p.
It corrected differential pressure deviation amount deviation correction amount .delta.e △ _P2H obtained by calculation based on one value obtained by adding one of _h e △
_An operation amount u _{n1 Δp} is calculated based on _p2f , and the rotation speed n ₁ of the first-stage extruder drive motor 14 is set so as to reduce the value of the corrected differential pressure deviation amount e △ _p2f based on the operation amount. Motor drive speed control device 120B for driving the first stage extruder to be controlled
Since it is configured as, the differential pressure deviation amount with respect to the set differential pressure of the differential pressure of the molten resin generated along the flow of the molten resin,
The drive speed of the first-stage extruder drive motor is controlled based on a value corrected by a correction deviation amount corresponding to one of the thickness of the resin molded product and the thickness deviation amount with respect to the set thickness of the same. Even if there is a change in viscosity due to the temperature change of the plasticized molten resin, it is possible to always keep the discharge amount of the resin constant with high accuracy and obtain a molded product with uniform thickness (Claim 7). (8) the first stage extruder drive motor drive speed controller 120, the difference pressure deviation amount e △ _p difference圧基present deviation e △ _p
And then, the same difference圧基present deviation e △ _p, and the calculation based on either the value of the temperature deviation e _t for the resin temperature detector 102 is the set temperature of the temperature t and the temperature detected a deviation correction amount .delta.e _pt obtained deviation correction amount obtained by the calculation based on either the value of the thickness deviation amount e _h for setting the thickness of the thickness h and the thickness .delta.e △
and _p2h calculates the manipulated variable u _n1 △ _p based on the sum-obtained corrected differential pressure deviation amount e △ _p2f, the so as to reduce the value of the corrected differential pressure deviation amount e △ _p2f based on the operation amount Since the first stage extruder drive motor 14 is configured as the first stage extruder drive motor drive speed control device 120B for controlling the rotation speed n ₁ of the motor 14, the differential pressure of the molten resin generated along the flow of the molten resin The difference in pressure difference with respect to the set differential pressure, the temperature of the molten resin and the correction difference in accordance with one of the values of the temperature difference with respect to the set temperature of the same temperature, and the thickness of the resin molded product and the same thickness The drive speed of the first-stage extruder drive motor can be controlled based on the value corrected by the correction deviation amount corresponding to one of the thickness deviation amounts with respect to the set thickness, and Of the viscosity of the molten resin Even if there is, the discharge amount of the resin can always be kept constant with high accuracy, and a molded product having a uniform thickness can be obtained. (9) Since the differential pressure setting section is set in the connection pipe 30 connected between the outlet of the first-stage extruder and the inlet of the second-stage extruder, The difference between the differential pressure of the molten resin and the set differential pressure of the differential pressure of the molten resin in the connecting pipe section connecting the extruder and the second-stage extruder is determined by any one of the temperature of the molten resin and the temperature deviation relative to the set temperature of the same temperature. The discharge amount of the resin can be controlled based on the value corrected by the correction deviation amount according to one of the values, and even if there is a change in viscosity due to the temperature change of the plasticized molten resin, it is always highly accurate Thus, the discharge amount of the resin can be kept constant, and a molded product having a uniform thickness can be obtained (claim 9). (10) Since the differential pressure setting section is set in a section between the inlet and the outlet of the second stage extruder 20, the second
The difference between the differential pressure of the molten resin in the section between the inlet and the outlet of the step extruder with respect to the set differential pressure is defined as one of the temperature of the molten resin and the temperature deviation with respect to the set temperature of the same temperature. The discharge amount of the resin can be controlled based on the value corrected by the correction deviation amount according to one value, and even if the viscosity changes due to the temperature change of the plasticized molten resin, it is always highly accurate. The discharge amount of the resin can be kept constant, and a molded product having a uniform thickness can be obtained.

[Brief description of the drawings]

FIG. 1 is an overall schematic configuration diagram of an in-line two-stage extruder according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a control system of the in-line two-stage extruder of FIG.

FIG. 3 is an overall schematic configuration diagram of an in-line two-stage extruder according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram of a control system of the in-line two-stage extruder of FIG. 3;

FIG. 5 is an overall schematic configuration diagram of an in-line two-stage extruder according to a third embodiment of the present invention.

6 is an explanatory diagram of a control system of the in-line two-stage extruder of FIG.

FIG. 7 is an overall schematic configuration diagram of an in-line two-stage extruder according to a fourth embodiment of the present invention.

8 is an explanatory diagram of a control system of the in-line two-stage extruder of FIG.

FIG. 9 is an overall schematic configuration diagram of an in-line two-stage extruder according to a fifth embodiment of the present invention.

10 is an explanatory diagram of a control system of the in-line two-stage extruder of FIG. 9;

FIG. 11 is an overall schematic configuration diagram of an in-line two-stage extruder according to a sixth embodiment of the present invention.

FIG. 12 is an explanatory diagram of a control system of the in-line two-stage extruder of FIG. 11;

FIG. 13 is an overall schematic configuration diagram of an in-line two-stage extruder according to a seventh embodiment of the present invention.

14 is an explanatory diagram of a control system of the in-line two-stage extruder of FIG.

FIG. 15 is an overall schematic configuration diagram of an in-line two-stage extruder according to an eighth embodiment of the present invention.

16 is an explanatory diagram of a control system of the in-line two-stage extruder of FIG.

FIG. 17 is a calculation explanatory diagram for explaining a calculation for obtaining a correction amount based on viscosity of a deviation amount of a pressure or a differential pressure in the in-line two-stage extruder of the present invention.

FIG. 18 is an explanatory diagram illustrating a calculation when a correction amount based on a thickness deviation of a deviation amount of a pressure or a differential pressure in the in-line two-stage extruder of the present invention is obtained.

FIG. 19 is an explanatory diagram illustrating a main relationship among a deviation amount, an operation amount, and a control amount in the in-line two-stage extrusion device of the present invention.

FIG. 20 is an overall schematic configuration diagram showing an example of a conventional tandem extruder.

FIG. 21 is an overall schematic configuration diagram showing an example of another conventional tandem extruder different from FIG.

FIG. 22 is an overall schematic configuration diagram showing an example of still another conventional tandem extruder different from FIGS. 20 and 21.

[Explanation of symbols]

(Hereinafter, a conventional tandem extruder) 10 First-stage extruder 11 Screw 12 Cylinder 13 Heater 14 First-stage extruder drive motor 15 Reduction device 16 Heater output control device 17 First-stage motor drive speed control device 171 Pressure setting 172 Pressure detector 173 Deviation amount calculator 174 Operation amount calculator 18 Motor speed control device 20 Second stage extruder 21 Screw 22 Cylinder 23 Heater 24 Second stage extruder drive motor 25 Reduction gear 26 Heater output control device 27 second stage extruder drive motor drive speed controller 271 pressure setter 272 pressure detector 273 deviation amount calculator 274 operation amount calculator 28 motor rotation speed controller 30 connecting pipe 31 inlet section 32 outlet section 40 connecting pipe 50 Die 60 Filter (hereinafter, the in-line two-stage extruder of the present invention) 80 Pressure control type Discharge control device 81 Pressure setting device 82 Pressure detector 83 Deviation amount calculator 83A Deviation amount calculator 84 Operation amount calculator 80A Pressure controller with viscosity correction 80A1 Pressure controller with temperature input type viscosity correction 80B Pressure control with thickness deviation correction Mold discharge control device 90 Differential pressure generation unit 91 Heater output control device 92 Heater 93 Throttle unit 100 Second stage extruder temperature controller 101 Temperature setter 102 Temperature detector 103 Deviation amount calculator 104 Operation amount calculator 110 One-stage extrusion Motor driving speed control device for machine driving 111 Differential pressure setting device 112 Differential pressure detector 1121 Inlet pressure detector 1122 Outlet pressure detector 1123 Differential pressure calculator 113 Differential pressure deviation calculator 114 Differential pressure manipulated calculator 120 First Motor drive speed control device for driving the first stage extruder 120A Motor drive speed control for driving the first stage extruder Device 120B First stage extruder drive motor drive speed control device 121 Differential pressure setting device 122 Differential pressure detector 1221 Inlet pressure detector 1222 Outlet pressure detector 1223 Differential pressure calculator 123 Differential pressure deviation calculator 124 Differential pressure operation Volume calculator 150 Thickness controller 151 Thickness setter 152 Thickness detector 153 Deviation calculator 154 Operating variable calculator 160 Thickness controller 170 Cooling device 180 Film 200 Pressure deviation corrector 210 Pressure deviation corrector due to viscosity 211 Input Means 212 Computing device 213 Adder 220 Pressure deviation compensation device due to thickness deviation 221 Input means 222 Computing device 223 Adder 300 Lip section 310 Differential pressure deviation compensation device due to viscosity 311 Input means 312 Computing device 313 Adder 320 Due to thickness deviation Differential pressure deviation correction device 321 Input means 322 Arithmetic unit 323 Adder (hereinafter, symbol) P pressure △ P Differential pressure q Heat output T Temperature H Film thickness p Pressure measurement △ p Measurement value of differential pressure h Measurement value of film thickness e Deviation correction for viscosity characteristic of the correction quantity η set value for the amount δ setpoint function e _p = _{p ds} -p _d setting deviation of the discharge pressure (basic deviation amount before adding the correction amount) e _t = _{t ds} -t _d correction amount e _h = e (e _t) set by the correction amount δ _ph = _h (e h) film thickness deviation of setting the discharge pressure due to the temperature difference of the deviation amount δ _pt = η (e _t) set discharge pressure set discharge temperature This shows that the thickness deviation has a certain relationship with the temperature deviation. The final deviation after correction for _{e pf = e p + δ pt} + δ ph pressure, indicating that the sum of e _p and [delta] _pt and [delta] _{ph. e △ p = △ p ds -} △ p deviation of _d set differential pressure (basic deviation amount before adding the correction _{amount) δ △ p = η (e} t) correction amount by the temperature deviation of the target pressure difference [delta] △ _ph = Η _h (e _h ) Correction amount due to film thickness deviation of set differential pressure e △ _pf = e △ _p + δ △ _pt + δ △ _ph The final deviation after correction to the set differential pressure is the difference between e _p , δ _pt and δ _ph Indicates a sum. (Hereinafter, subscripts) S Subscript for set value 1 Subscript for first stage 2 Subscript for second stage d Subscript for discharge p Subscript for pressure t Subscript for temperature Δp Subscript for differential pressure f Subscript for deviation after correction

Claims (10)

[Claims] 1. A first-stage extruder 10 driven by a first-stage extruder drive motor 14 to extrude a molten resin, and extruded from an outlet of the first-stage extruder 10 and sent through a connection pipe 30. A second-stage extruder 20 driven by a second-stage extruder motor 24 to extrude the molten resin; and an extruder connected to the outlet of the second-stage extruder 20 and extruded from the second-stage extruder 20. A serial two-stage extruder for molding a resin molded product having a die 50 for discharging a molten resin, wherein a set pressure of a pressure detected by a pressure detector for detecting a resin pressure near an inlet of the die 50 is set. calculates the manipulated variable u _N1P based on the pressure deviation e _p respect, the pressure deviation e _p based on the operation amount
And the temperature of the resin near the inlet of the die 50 is controlled by controlling the rotation speed n ₁ of the motor 14 for driving the first stage extruder so as to reduce the value of calculates the manipulated variable u _H2T based on the temperature deviation e _t for the set temperature of the temperature t _d of the resin the resin temperature detector detects that detects the said temperature deviation e _t on the basis of the manipulated variable
-Stage extruder temperature controller 1 for controlling the temperature of the resin passage wall of the second-stage extruder 20 so as to reduce the value of
00. An in-line two-stage extruder comprising: 2. A series two-stage extrusion apparatus according to claim 1, said first-stage extruder drive motor drive speed control device 80, the pressure deviation e _p is the pressure base deviation e _p,
The same pressure basic deviation e _p, deviation correction the resin temperature detector obtained by a calculation based on either the value of the temperature deviation e _t for setting the temperature of the detected temperature t _d and the same temperature calculates the manipulated variable u _N1P based on the correction pressure deviation e _pf obtained by adding the amount .delta.e _pt, the corrected pressure deviation e _pf the first stage extruder to the value to small based on the operation amount An in-line two-stage extruder, which is a first-stage extruder drive motor drive speed controller 80A for controlling the number of revolutions n ₁ of the drive motor 14. 3. A series two-stage extrusion apparatus according to claim 1, said first-stage extruder drive motor drive speed control device 80, the pressure deviation e _p is the pressure base deviation e _p,
The same pressure basic deviation e _p, deviation correction amount obtained by the calculation based on either the value of the thickness deviation amount e _h for setting the thickness of the thickness h and the thickness of the resin molded product δe
manipulated _variable u based on the corrected pressure deviation e _pf obtained by adding _ph
n _1p is calculated, and the corrected pressure deviation amount e is calculated based on the operation amount.
a first-stage extruder driving motor drive speed control device 80 for controlling the number of revolutions n ₁ of the first-stage extruder driving motor 14 so as to reduce the value of _pf ; Extrusion equipment. In series two-stage extrusion apparatus according to 4. The method of claim 1, said first-stage extruder drive motor drive speed control device 80, the pressure deviation e _p is the pressure base deviation e _p,
The same pressure basic deviation e _p, temperature deviation amount e relative to the temperature t and the temperature of the set temperature the resin temperature detector detects
a deviation correction amount .delta.e _pt obtained by a calculation based on either the value of _t, either of the thickness deviation amount e _h for setting the thickness of the thickness h and the thickness of the resin molded product The operation amount _un1p based on the corrected pressure deviation amount e _pf obtained by adding the deviation correction amount δe _ph obtained by calculation based on the value.
Is calculated, and the first-stage extruder driving motor 1 is driven to reduce the value of the corrected pressure deviation amount e _pf based on the operation amount.
4. A serial two-stage extruder, which is a first-stage extruder driving motor drive speed controller 80 that controls the number of rotations n _{1 of the} fourth extruder. 5. A first-stage extruder 10 driven by a first-stage extruder drive motor 14 to extrude a molten resin, and extruded from an outlet of the first-stage extruder 10 and sent through a connection pipe 30. A second-stage extruder 20 driven by a second-stage extruder motor 24 to extrude the molten resin; and an extruder connected to the outlet of the second-stage extruder 20 and extruded from the second-stage extruder 20. This is a series two-stage extruder for molding a resin molded product having a die 50 for discharging a molten resin, wherein a differential pressure Δp ₁ detected in a differential pressure setting section set along the flow of the molten resin is provided. set differential calculates the manipulated variable u _n1 △ _p1 based on a difference pressure deviation amount e △ _p1 against pressure, the operation amount of the difference pressure deviation amount e △ _p1 value the first stage extruder drive so as to reduce the basis Speed control for driving the first stage extruder for controlling the rotation speed n ₁ of the motor 14 A device 110, 120, either one of the temperature deviation e _t to the resin temperature detector 102 of resin detected temperature t _d and the same temperature of the set temperature for detecting a resin temperature of an inlet portion near the die 50 calculates the manipulated variable u _H2T based on the value, the second to reduce the value of the temperature deviation e _t on the basis of the manipulated variable
A two-stage extruder temperature controller 100 for controlling the temperature of the resin passage wall of the two-stage extruder; 6. The in-line two-stage extruder according to claim 5, wherein the first-stage extruder driving motor drive speed controller 120 converts the differential pressure deviation e △ _p1 into a differential pressure basic deviation e △.
and _p, the same difference圧基present deviation e △ _p, based on either the value of the temperature deviation e _t for the temperature t _d and the same temperature of the set temperature of the resin the resin temperature detector 102 detects based on the deviation obtained by the calculation correction amount .delta.e △ correction difference obtained by adding the _p2t pressure deviation amount e △ _p2f calculates the manipulated variable u _n1 △ _p2, the corrected differential pressure deviation amount e on the basis of the manipulated variable △ The motor 1 for driving the first-stage extruder so as to reduce the value of _p2f.
A first stage extruder driving motor drive speed control device 120A for controlling the number of rotations n ₁ of the first extruder 4; the second stage extruder temperature control device 100 controls the resin temperature t detected by the resin temperature detector 102; manipulated variable u on the basis of one value of _d and the temperature deviation e _t for the same temperature of the set temperature
It calculates the _P2T, in the above-mentioned temperature deviation amount e _t second stage extruder temperature controller 100 for controlling the temperature of the resin passage wall of the second-stage extruder to the value to small based on the operation amount An in-line two-stage extruder, characterized in that: 7. The in-line two-stage extruder according to claim 5, wherein the first-stage extruder driving motor drive speed controller 120 converts the differential pressure deviation e △ _p into a differential basic pressure deviation e △.
_p , the thickness difference e with respect to the thickness h of the resin molded product and the thickness set value of the same thickness is added to the same differential pressure basic deviation e △ _p.
It corrected differential pressure deviation amount deviation correction amount .delta.e △ _P2H obtained by calculation based on one value obtained by adding one of _h e △
_An operation amount u _{n1 Δp} is calculated based on _p2f , and the rotation speed n ₁ of the first-stage extruder drive motor 14 is set so as to reduce the value of the corrected differential pressure deviation amount e △ _p2f based on the operation amount. Motor drive speed control device 120B for driving the first stage extruder to be controlled
An in-line two-stage extruder, characterized in that: 8. The in-line two-stage extruder according to claim 5, wherein the first-stage extruder driving motor drive speed controller 120 converts the differential pressure deviation e △ _p2 into a differential pressure basic deviation e △.
and _p2, the same difference圧基present deviation e △ _p2, and the calculation based on either the value of the temperature deviation e _t for the resin temperature detector 102 is the set temperature of the temperature t and the temperature detected a deviation correction amount .delta.e _pt obtained by deviation correction amount obtained by the calculation based on either the value of the thickness deviation amount e _h for setting the thickness of the thickness h and the thickness .delta.e △
_The manipulated _{variable un1p} is calculated on the basis of the corrected differential pressure deviation e2p2f obtained by adding _p2h and the first differential pressure _e2p2f based on the manipulated variable to reduce the value of the corrected differential pressure deviation e △ _p2f . An in-line two-stage extruder, which is a first-stage extruder drive motor drive speed controller 120B for controlling the number of revolutions n ₁ of the two-stage extruder drive motor 14. 9. The in-line two-stage extruder according to claim 5, wherein the differential pressure setting unit is connected between an outlet of the first-stage extruder and an inlet of the second-stage extruder. A two-stage in-line extruder, which is set in the connection pipe 30. 10. The in-line two-stage extruder according to claim 5, wherein the differential pressure setting section is set in a section between an inlet and an outlet of the second-stage extruder 20. Characterized by a two-stage extruder in series.