JPH011508A - Filtration equipment for thermoplastic material filtration - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a filtration device for filtering a thermoplastic or thermosetting high-temperature fluid material using a continuous filter.

[Conventional technology]

Conventionally, in the above-mentioned type of filtration device, a thermoplastic material is flowed under high temperature and pressure through a filter passage formed in the housing. The housing is also provided with inlet and outlet ports located on either side of the filter passage. A continuous filter enters the passageway through the inlet port, moves through the passageway and out of the outlet port, and a portion of the filter that extends within the filter passageway filters material flowing therethrough. It is supposed to be done.

Various devices have been proposed for moving a filter through a filter passage. An example of such a device is described in US Pat. No. 3,971,721, in which an external device is used to mechanically grip and pull the filter through the device.

Although the operation of such devices is satisfactory, they are expensive and occupy a large amount of space, thus resulting in large filtration devices and limited installation space, as in typical commercial production lines. In some cases, installation is difficult.

US patent! Another prior art technique is described in US Pat. No. 3,471,017, in which a solidified plastic plate of thermoplastic material is formed at the exit port.

The plug is joined to the filter and forced out of the outlet port by the pressure of the flowable material within the filter passageway. In this type of device, after the plug has formed, the temperature at the exit port must be controlled within a few degrees Celsius in order to reheat the solidification bladder to a point where the movement of the plug can be controlled carefully enough. It has the disadvantage that it cannot be used. Insufficient reheating will cause the plug to remain lodged in the outlet port; overheating will cause the plug to separate from the filter and, in extreme cases, be forced out of the outlet port due to the pressure of the flowable material in the filter passages. blown away. Furthermore, it is difficult to operate this type of device on a commercial scale since the required temperature range varies depending on the material to be filtered.

Another prior art device of this type is described in U.S. Pat. No. 4,021,346, in which:
Attempts have been made to combine the plug concept with mechanical external devices. Even with this device, the plug temperature must be delicately controlled, and the external device is large and expensive.

〔Problems to be solved〕

The overall object of the invention is to provide an improved means for controlling the movement of a continuous filter through a filtration device, which does not have the disadvantages and disadvantages described above with respect to the prior art.

A specific object of the present invention is to apply the pressure of a flowable thermoplastic material to a solidified plug of material bonded to the filter at an outlet port to drive a continuous filter and to move the plug and filter past the outlet. The object of the present invention is to provide a filtration device in which the filtration is controlled by means located outside the outlet port.

[Summary of the invention]

In embodiments of the invention described in detail below, these and other objects are accomplished by locating a stopper outside the housing and in the path of the plug outflow from the outlet port. The portion of the plug that contacts the stopper is selectively heated, thereby causing the plug to flow past the stopper in a controlled manner.

Preferably, the stopper is heated to control the movement of the plug.

Preferably, the stopper is movable between a closed position in which it obstructs the outlet port and an open position spaced therefrom along the plug outflow path. The stop is closed during the start-up phase to allow initial formation of the plug and then moved to the open position ffl to allow controlled movement of the plug.

Preferably, the stopper is shaped like a knife, and the heated portion of the plug in contact with the stopper is divided into two strip-shaped portions, so that the strip-shaped portion passes through the stopper as the plug flows out of the outlet port.

To facilitate the passage of the plug at the exit port,
Heating means may also be provided along the outlet port.

Next, embodiments of the present invention will be described based on the drawings.

〔Example〕

In FIG. 1, the illustrated filtration device according to the present invention has a housing 10 formed with a sifter filter passage 12;
Passage 12 is adapted to flow hot thermoplastic material under pressure in the direction indicated by arrow 14. The housing is provided with longitudinally extending inlet and outlet ports (16i8) in communication with the filter passageway (12). The width W1 and cross-sectional area of the inlet port 16 are significantly smaller than the width W2 and cross-sectional area of the outlet port 18.

A filter spool 20 is rotatably attached to the outside of the housing 10. The spool is continuously provided with a filter 22 in a coiled manner. The filter 22 is preferably of the type described in U.S. Pat. No. 4,070,293, and its contents are described below for reference.

The filter is generally a wire mesh and includes spaced apart seal members 24 extending transversely to the length of the filter.

The filter 22 exits the spool 20 and enters the filter passageway 12 through the n1 inlet port 16, through which it exits through the outlet port 18.

The part of the filter 22 that passes through the filter passage is P1.
It is supported by a no-car plate 26.

A stopper 28 is provided on the outside of the housing 10 and located at the outlet port 18 . The stopper is supported at one end of a rod 30 that threads into a block 32 supported by an external bracket 34. By rotating and adjusting the rod 30, the stopper can be moved between the closed position shown in FIG. 1 and the open position shown in FIG.

In the closed position, stopper 28 clamps the filter against the outlet port walls, indicated at 36, safely sealing the outlet port.

A plurality of coolant passageways, as indicated at 38, are provided within the housing and pass through a plurality of predetermined locations in the housing along outlet port 18.

An electrical resistance heater 40 is attached to the stopper 28, and an auxiliary electrical resistance heater 42 is located adjacent the inlet and outlet ports 16i8.

Thermocouples (not shown) are also provided next to the inlet and outlet ports 16,18 and in the stopper 28. Water or other suitable coolant is circulated in a controlled manner through the coolant passages 3B by conventional means (not shown).

During the start-up phase, stopper 28 is adjusted to the closed position shown in FIG. 1, allowing thermoplastic material to flow at elevated temperature and pressure into filter passage 12 and the portion of filter 22 that passes therethrough. Typically, the thermoplastic material is a polymer and is heated to about 400° C. from an upstream extruder or melt pump to filter passage 12 via a connecting pipe (not shown). Pushed in. During the start-up phase, hot thermoplastic material flows transversely to the inlet and outlet ports 16,18. Enter robot 16
Flow into the inlet port is impeded by a filter seal 24 that contacts the inlet port interior wall surface in sealing engagement. The outlet port 18 is larger in size than the filter seal 24, and a gap is formed between its inner wall surface and the seal 24, so that the flow into the outlet port is not obstructed by the filter seal 24. . Accordingly, the thermoplastic material travels through the outlet port 18 on a pedestal that abuts the closure stop 28, completely filling the outlet port.

While this operation is occurring, coolant is flowed through the passageway 38 to cool and solidify the thermoplastic material within the outlet port, thereby sealing the plug 44 in tight contact with the filter 22.
form. A thermocouple (not shown) detects when the appropriate temperature has been reached to form the plug. After the plug is formed, the stopper 28 is retracted to the open position of FIG. 2. When the stopper moves to the open position, the plug
, the pressure of the hot flowable material within the filter passageway 12 forces the plug out of the outlet port 18. Since the plug is tightly joined to the filter 22, the filter moves with the plug, thereby untying a new filter portion from the spool 20 and drawing it into the filter passageway 12 through the inlet port 16.

When the stopper 28 reaches the open position, the stopper 40 is energized and the stopper and the plug 44 in contact with it are energized.
Heat the pieces. When the plug contact portion is sufficiently heated, it becomes fluid and passes through the stopper 28, allowing the plug to be continuously ejected from the outlet port 44.

The stopper 28 is provided with a tapered nose (tip), and the plug 44 is connected to two flow dividing portions 44a.

It is preferable to configure it so that it is divided into 44b (band-shaped portions). In that case, the filter 22 is connected to one of the branch sections 4
4b in close contact.

The diverted portions 44m and 44b pass through the stopper 28 and are sent to another location, where they are further divided with a knife or the like (not shown) and discarded, or they are reheated and reused. The plug material for this purpose is recycled.

If the stopper 28 is provided with a tapered nose that is sharp to some extent, the nose can be partially embedded and fixed in the end of the plug 44 at the initial formation stage, and this is also effective. By fixing in this way, it is possible to reliably prevent the plug from slipping relative to the stopper until the heater 40 is energized and the plug movement can be controlled.

As the leading end of the plug 44 continues to exit the outlet port 18, by appropriately controlling the flow of coolant through the passageway 38, the plug is formed with a continuous trailing end. Heater 4
Depending on the control state of 0, the plug can be moved continuously or intermittently. To facilitate or facilitate passage of the plug at the exit port, auxiliary heater 42 may be energized to intermittently increase the temperature of the outer surface of the plug.

As can be seen from the foregoing, the present invention provides a simple and improved apparatus for controlling the operation of plug evacuation from the outlet port 18. Such operation can be controlled by first moving stopper 28 from a closed position to an open position and then selectively energizing tweeter 40.

Although the heater 40 described above is attached to the stopper 28 and is movable together with the stopper 28, other devices may be employed to heat the portion of the plug that comes into contact with the stopper. For example, the plug portion that contacts the stopper may be heated by an externally placed resistor, dielectric heating, heating fluid, or other heating means. Similarly, mechanisms other than those described above may be employed for moving the stopper between the open and closed positions; for example, the stopper may be attached to the end of the piston rond of a double-acting cylinder. .

The above deformed structure and other deformed structures are also included within the scope of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a schematic horizontal cross-sectional view of a filtration device according to the invention with the outlet stop bar in the closed position, and FIG. 2 shows the outlet port with the outlet stop bar adjusted to the open position allowing the plug to flow out. This is an enlarged view. 10...Housing, 12...Filter passage, 16...Inlet port, 18...Outlet port,
22... Continuous filter, 24... Seal member, 28... Stopper, 40... Electric resistance heater. Patent Applicant Key Filters Incorporated Agent Masaki Yamakawa (T≧2 people) Procedural Amendment ζ
1. Indication of the incident 1986 Patent Application No. Go 6,022

Claims (2)

[Claims] (1) A filtration device for filtering a thermoplastic material that becomes fluid at a high temperature and solidifies at a low temperature, wherein a passage through which the material flows at a high temperature and a pressurized state is formed in the housing; and the passage communicates with the passage. an inlet and an outlet port in the housing; a continuous filter movable from the inlet port through the passageway and out of the outlet port; a portion of the filter within the passageway filtering material flowing therethrough; providing a cooling means for forming a solidified plug of the material in the outlet port, joining the filter to the plug and adjusting the dimensions of the plug to the pressure of the flowable material in the passageway; sets the plug to be pushed out of the outlet port so that, in response to the push, the filter is drawn from the inlet port into the passageway; stopper means for resisting movement out of the port; heating means for reheating the portion of the plug in contact with the stopper means, the degree of reheating being controlled by the plug passing through the stopper means; A filtration device for filtration of thermoplastic material, characterized in that the setting is sufficient to allow migration out of the exit port. (2) A filtration device for filtering a thermoplastic material that becomes fluid at a high temperature and solidifies at a low temperature, wherein a passage through which the material flows at a high temperature and a pressurized state is formed in the housing; wall means defining an inlet and an outlet port communicating with the passageway, the outlet port being wider in cross-sectional area than the inlet port; movable from the inlet port through the passageway and out of the outlet port; a continuous filter is provided with a portion of the filter within the passageway filtering material flowing therethrough; the filter is provided with a plurality of spaced apart seal members; the shape and dimensions of the seal members; is configured such that the sealing member acts in sealing engagement with wall means forming the inlet port, thereby preventing flowable material within the passageway from exiting the inlet port; the sealing member is dimensioned with respect to the wall means forming the outlet port to provide a gap therebetween sufficient to permit the flow of the material; cooling the material to the filter; Cooling means are associated with the wall means for forming a mating solidified plug, and the dimensions of said plug are controlled by said plug acting in sealing engagement with said wall means forming said outlet port to allow flowable material therefrom to flow therefrom. the plug is forced out of the outlet port by the pressure of the flowable material in the passageway, thereby causing the filter to move from the inlet port into the passageway in response to the extrusion. stopper means contacting said plug and filter to resist their movement out of said outlet port; heating means reheating said plug contacting said stopper means; The stopper means is configured such that the reheating portion of the plug is divided into a plurality of portions, and the divided portions are pushed by the pressure of the flowable material in the passageway so that the reheating portion of the plug is divided into a plurality of portions. A filtration device for filtrating thermoplastic material, characterized in that the filter passes through a stopper means and remains joined to one of the divided portions.