JP2006341478A - Continuous kneader and kneading system equipped with kneader - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a continuous kneader which can suppress the heat generation and degradation of a material to be kneaded during kneading and finish kneading in a short time while suppressing a decline in kneading performance and a kneading system equipped with the kneader. <P>SOLUTION: A twin-screw kneading extruder 1 is equipped with a screw set 3 having screws 5 and 9 and a kneading rotor 7 on the outer surface of a rotary shaft 4 and a barrel 2 in which the screw set 3 is arranged in a cylindrical chamber. The barrel is divided in the axial direction into three zones 6, 8, and 10. In order to control the temperature of the material to be kneaded in each zone, another heating medium channel is formed inside the barrel. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a continuous kneading apparatus capable of efficiently controlling the temperature of an object to be kneaded and a kneading system having the apparatus.

  In a general continuous kneader, since the material to be kneaded (resin: low viscosity kneaded material) is kneaded in a molten state, a heating mechanism such as a heater or a cooling mechanism that allows cooling water to flow inside or outside the barrel In spite of having a high-viscosity kneaded material (rubber kneading: melting at high viscosity) If not, the shape and arrangement of screws, kneading rotors, etc. in the screw set, rotational speed control of the screw set during operation, re-milling (re-kneading: once discharged from the device at the predetermined temperature of the material to be kneaded) The temperature of the material to be kneaded is lowered and then charged again into the apparatus) to suppress heat generation due to shearing of the material to be kneaded.

Moreover, in the biaxial kneading extruder (continuous kneading apparatus) disclosed in Patent Document 1 below, in addition to a cooling mechanism in which cooling water circulates inside the barrel, tips of blades such as screws and kneading rotors in the screw set A gap formed between the inner wall of the barrel and the inner wall of the barrel, that is, a so-called chip clearance, is made different in each axial part of the screw set to devise the flow characteristics of the material to be kneaded in the chamber to suppress heat generation. .
JP 2003-245534 A

  However, in the conventional continuous kneading apparatus, when kneading a highly viscous material to be kneaded, the cooling by the cooling mechanism through which the cooling water flows inside the barrel cannot catch up with the heat generated by the shearing provided by the tip clearance, There was a problem that the kneaded product became high temperature and mechanical shearing could not be sufficiently exhibited, and kneading performance was deteriorated (dispersion of the compounding agent became difficult). Of course, when the temperature exceeds a predetermined temperature, the quality of rubber or the like is deteriorated.

  On the other hand, if heat generation due to shearing is reduced by reducing the rotational speed of the screw set or remilling is performed, the kneading process takes a lot of time, and there is a problem in that the productivity of products such as tires is reduced.

  In addition, since the chip clearance is not sufficiently optimized, there are problems such as insufficient suppression of heat generation of the material to be kneaded, and too much widening of the chip clearance, resulting in decreased kneading performance. .

  The present invention has been made in view of the above circumstances, and suppresses heat generation and deterioration of a material to be kneaded during kneading while suppressing deterioration in kneading performance, and a continuous kneading apparatus capable of kneading in a short time and the apparatus. An object of the present invention is to provide a kneading system.

  In order to achieve the above object, a continuous kneading apparatus according to the present invention comprises: a screw set having a wing on the outer surface of a rotating shaft; and a barrel formed by arranging the screw set in a cylindrical chamber. In the continuous kneading apparatus, the barrel is divided into a plurality of zones in the axial direction, and a heat medium flow path is formed inside the barrel so as to control the temperature of the material to be kneaded for each zone.

  The barrel is divided into three zones corresponding to a feed part, a kneading part, and an extrusion part in the screw set.

  The heat medium flow path is supplied with cooling water, hot water, or a mixed water of cooling water and hot water.

  The continuous kneading apparatus is a twin-screw kneading extruder.

  Moreover, the wing | blade part with which the outer surface of the rotating shaft was equipped has a structure which mutually meshes | engages between two axes.

  In addition, the wings are structured to engage with each other between two axes over the entire length or part of the rotation shaft.

  The continuous kneader is a single-screw kneading extruder.

  The continuous kneading apparatus is characterized by kneading rubber or a rubber-based composition.

  Further, h / D, which is a ratio of a gap h formed between the tip of the blade portion and the inner wall surface of the chamber, and an inner diameter D of the chamber, is 0.01 or more.

  In order to achieve the above object, a kneading system according to the present invention has a kneader for master kneading and a continuous kneading device provided downstream of the kneading machine, and the continuous kneading device has the above-described configuration. It is a kneading apparatus.

  Further, it has a kneader for master kneading, an undermixer and a cooling device provided downstream of the kneader, and a continuous kneading device provided downstream of the cooling device, and the continuous kneading device is described above. It is a continuous kneading apparatus having a configuration.

  In addition, the continuous kneading apparatus includes a first continuous kneading apparatus provided downstream of the master kneading machine and used for remilling, and a second continuous kneading apparatus provided downstream of the first continuous kneading apparatus and used for final kneading. Characterized by comprising a continuous kneading apparatus.

  According to the continuous kneading apparatus of the present invention, the temperature of the material to be kneaded can be optimally controlled for each zone by adjusting the supply amount of the heat medium flowing through the heat medium flow path for each zone. Thus, while suppressing a decrease in kneading performance, heat generation and deterioration of the material to be kneaded during kneading can be suppressed, and kneading can be performed in a short time.

  According to the kneading system according to the present invention, compared with the batch type kneading which is a conventional general rubber kneading method, the cost and the kneading process time can be remarkably advantageous, and the productivity is improved. Can be made.

  Hereinafter, a continuous kneading apparatus and a kneading system having the apparatus according to the present invention will be described in detail with reference to the drawings.

  1 is a structural explanatory view of a twin-screw kneading extruder showing Embodiment 1 of the present invention, FIG. 2 is a barrel sectional view, FIG. 3 is a system diagram of cooling water and warm water, FIG. 4 is a control flow of temperature adjustment, FIG. Is a control pattern of temperature adjustment.

  As shown in FIG. 1, the twin-screw kneading extruder 1 has a pair of screw sets 3 parallel to the inside of the barrel 2. In general, the screw set is configured by combining one or more segments such as a kneading rotor, a kneading disk, and a screw on the outer periphery of a rotating shaft.

  Each screw set 3 in the present embodiment includes a feed portion 6 having screws (fins) 5 on the outer surface of the rotating shaft 4 and a rotating shaft 4 from the supply side of the material to be kneaded that is rubber or a rubber-based composition. The kneading unit 8 includes a kneading rotor 7 on the outer surface, and the extruding unit 10 includes a screw (fin) 9 on the outer surface of the rotating shaft 4.

  The pair of parallel screw sets 3 are rotated at the same speed or different speeds in opposite directions by the motor 11 via the power transmission mechanism 12 that also serves as a speed reduction mechanism. The two screw sets 3 may rotate in the same direction. At this time, the blades such as the screw 5, the kneading rotor 7 and the screw 9 are engaged with each other between the two axes over the entire length of the rotary shaft 4. Further, a structure in which the wings mesh with each other between two axes in a part of the rotating shaft 4 may be employed.

  In the biaxial kneading extruder 1, the opposing screws 5 of the feed unit 6 convey the material to be kneaded introduced from a hopper (not shown) in the downstream direction and supply it to the kneading unit 8. In the kneading section 8, as shown in FIG. 2, a cylinder formed in the barrel 2 by engagement of a plurality of kneading rotors 7 provided on the outer surface of the rotating shaft 4 and in the barrel 2 The material to be kneaded is kneaded by the shearing force generated in the gap (chip clearance) h with the inner wall surface of the cylindrical chamber 13 (which has a shape in which two cylinders are fused due to the two shafts). Then, the kneaded material is carried out to the next step by the screw 9 opposed to each other in the extrusion unit 10 located on the downstream side of the kneading unit 8.

  As shown in FIGS. 2 and 3, in the biaxial kneading extruder 1, the barrel 2 is divided into three zones A, B, and C in the axial direction, and the temperature control of the material to be kneaded is performed for each zone. In order to carry out, the heat medium flow paths 14a to 14c are formed in the barrel 2 in one zone and addressed to the three system paths in units of the barrel 2 (therefore, the number of system paths differs depending on the number of barrel units). In the illustrated example, each of the heat medium flow paths 14a to 14c is branched into two flow paths in the barrel 2, and is reciprocated in the axial direction a plurality of times for each screw set 3 to cool or heat the portion to be kneaded in the chamber 13. After that, they are gathered again. The barrel 2 is divided into three zones corresponding to the feed unit 6, the kneading unit 8 and the extrusion unit 10 in the screw set 3. A heat medium flow path 14 d is also formed in the barrel of the discharge unit (or extrusion molding unit) 15 attached downstream of the extrusion unit 10.

  The cooling water from the cooling water supply tank 16A can be supplied to the heat medium flow path 14a of the zone A through the cooling water pipe 17 and the merge pipe 18a, and the hot water from the hot water supply tank 19A is hot water. Supply is possible through the pipe 20 and the junction pipe 18a. Further, a mixing / switching control valve 21a is provided at the joining portion of the cooling water pipe 17 and the hot water pipe 20 connected to the joining pipe 18a, whereby the cooling water, the hot water, the cooling water and the hot water are provided in the heat medium passage 14a. Any one of the mixed water is supplied.

  Cooling water from the cooling water supply tank 16A can be supplied to the heat medium flow path 14b in the zone B through the cooling water pipe 17 and the merge pipe 18b, and hot water from the hot water supply tank 19A is heated. Supply is possible through the pipe 20 and the junction pipe 18b. And the mixing / switching control valve 21b is provided in the junction part of the cooling water piping 17 and the hot water piping 20 connected to the merging piping 18b, and, thereby, cooling water, warm water, cooling water, and warm water are provided in the heat medium flow path 14b. Any one of the mixed water is supplied.

  The cooling water from the cooling water supply tank 16A can be supplied to the heat medium flow path 14c in the zone C through the cooling water pipe 17 and the merge pipe 18c, and the hot water from the hot water supply tank 19A is heated. Supply is possible through the pipe 20 and the junction pipe 18c. Further, a mixing / switching control valve 21c is provided at the joining portion of the cooling water pipe 17 and the hot water pipe 20 connected to the joining pipe 18c, whereby the cooling water, the hot water, the cooling water and the hot water are provided in the heat medium passage 14c. Any one of the mixed water is supplied.

  Cooling water from the cooling water supply tank 16A can be supplied to the heat medium flow path 14d of the extrusion molding unit 15 through the cooling water pipe 17 and the merge pipe 18d, and hot water from the hot water supply tank 19A. Can be supplied through the hot water pipe 20 and the merging pipe 18d. A mixing / switching control valve 21d is provided at the junction of the cooling water pipe 17 and the hot water pipe 20 connected to the merging pipe 18d, whereby the heat medium flow path 14d has cooling water, hot water, cooling water and hot water. Any one of the mixed water is supplied.

  The flow rate of water supplied to the heat medium flow paths 14 a to 14 d is determined by the flow rate control valves 22 a to 22 d interposed in the cooling water pipe 17 and the flow rate control valves 23 a to 23 d interposed in the hot water pipe 20. And flow control valves 24a to 24d interposed in the single pipe portions of the merging pipes 18a to 18d and flow control valves 25a to 25cd respectively interposed in the three branch pipe portions of the merging pipes 18a to 18c. It is adjusted appropriately. In FIG. 3, 26 is a cooling water supply pump, and 27 is a hot water supply pump.

  On the other hand, all of the water flowing out from the heat medium flow paths 14 a to 14 d is collected in the return pipe 28 and returned to the return tank 29. From here, it is distributed and supplied to the cooling tank 16B and the heating tank 19B by a pump 31 through a pipe 30. In FIG. 3, 32 is a cooler for cooling water, and 33 is a heater for heating water. The cooling water in the cooling tank 16B is supplied to the cooling water supply tank 16A by the pump 34 at a predetermined time, and the hot water in the heating tank 19B is supplied to the hot water supply tank 19A by the pump 35 at a predetermined time. It has become.

In FIG. 3, T ₀ is a temperature sensor for detecting the supply temperature of the material to be kneaded to be fed into the feed section 6, and T _{1 to} T ₉ are provided for each unit of the barrel 2 and the temperature of the material to be kneaded in the barrel. T ₁₀ is a temperature sensor that detects the temperature of the material to be kneaded that is provided in the discharge unit 15 and discharged. T _L1 is a temperature sensor that detects the temperature of the cooling water in the cooling tank 16B, and T _L2 is a temperature sensor that detects the temperature of the cooling water in the cooling water supply tank 16A. T _H1 is a temperature sensor that detects the temperature of hot water in the heating tank 19B, and T _H2 is a temperature sensor that detects the temperature of hot water in the hot water supply tank 19A.

As shown in FIG. 2, the temperature sensors T _{1 to} T ₉ may be attached anywhere in the barrel 2. For example, the temperature sensors T _{1 to} T ₉ may be provided inside the barrel 2 (E portion in FIG. 2) or on the inner wall surface of the chamber 13. (F portion in FIG. 2), or may be embedded (G portion in FIG. 2) or partially protruded (H portion in FIG. 2) in the central portion between the axes of the barrel 2.

The detection signals of the temperature sensors T _{0 to} T ₁₀ and T _L1 , T _L2 , T _H1 and T _H2 are input to a controller (not shown). The switching control valves 21a to 21d, flow rate control valves 22a to 22d, 23a to 23d, 24a to 24d, 25a to 25c, the cooling water supply pump 26, the hot water supply pump 27, and the pumps 31, 34, and 35 are controlled. The temperature of the material to be kneaded is controlled.

  For example, as shown in the control flow of temperature adjustment in FIG. 4, first, in step P1, initial settings such as rubber type, rubber supply temperature, initial temperature of each chamber 13 (each zone 6, 8, 10), and cooling water After setting the operating conditions such as the set temperature of the hot water and the screw rotation speed (rotation speed of the screw set 3: rubber supply amount), the rubber temperature in each chamber 13 and the discharged rubber temperature of the discharge unit 15 are set in step P2. Set. At this time, various settings (values) in step P1 and step P2 are stored as temperature adjustment data (control data).

Next, after the operation of the apparatus (biaxial kneading extruder 1) is started in step P3, the temperature of the rubber in each chamber 13 and the temperature of the discharged rubber in the discharge unit 15 are measured by temperature sensors T _{1 to} T ₉ and T in step P4. Measure at ₁₀ .

  Next, in step P5, it is determined whether the rubber temperature in each chamber measured in step P4 and the discharged rubber temperature of the discharge unit 15 are equal to or lower than the set temperature set in step P2, and equal to the set temperature. If the temperature is equal to or lower than the set temperature, steady operation is performed in step P6.

  On the other hand, if the set temperature is exceeded, the supply amounts of the cooling water and the hot water are adjusted in step P7 and step P8 by the temperature adjustment data (control data) based on the various settings (values) in step P1 and step P2. That is, the mixing / switching control valves 21a to 21d are switched and the valve opening degrees of the flow control valves 22a to 22d, 23a to 23d, 24a to 24d, and 25a to 25c are adjusted.

By controlling in this way, for example, in a control pattern as shown in FIG. 5, the rubber temperature is set to NT (normal temperature), MT (medium temperature), HT (high temperature: 80 to 200 ° C. at the upper limit temperature) for each of the zones A to C. ) Can be controlled within the range. Incidentally, in FIG. 5 T _a is a rubber temperature in zone B the entrance (rubber kneading start temperature), T _b is the temperature of the rubber in the zone C inlet (Rubber extrusion start temperature).

In the control pattern I, even if the rubber temperature is charged to the zone A at a different temperature, the zone A
, B can be fixed to T _a , T _b = HT, and kneading can be performed at a temperature lower than the upper limit temperature of rubber, thereby ensuring rubber quality.

In the control pattern of II-a, even if the rubber temperature is charged into zone A by HT, in zone A, it is forcibly lowered to T _a = MT, and in zone B, T _b = HT is fixed to T _b. = HT or less, and the rubber temperature can be lowered as much as possible, so that the rubber quality can be improved.

In the control pattern II-b, if the temperature of the rubber is turned on NT zone A, the zone it is possible to suppress the T _a = MT in A, that the following also T _b = HT is fixed to the T _b = HT zone B The rubber quality can be improved by reducing the rubber temperature as much as possible.

In the control pattern III, even if the rubber temperature is charged to zone A at a different temperature, in zone A, the rubber temperature can be controlled to T _a = MT which is equal to or higher than the rubber kneading temperature, and in zone B, T _b = HT is fixed. It can also be suppressed to T _b = HT or less, and effective kneading becomes possible, and the length of the zone B (kneading length) can be shortened.

  In this way, in this embodiment, the temperature of the material to be kneaded is optimally controlled for each zone by adjusting the supply amount of the cooling water and hot water flowing through the heat medium flow paths 14a to 14d for each zone. Can do. The heat medium is not limited to cooling water and hot water, and other mediums may be used.

  As a result, while suppressing deterioration in kneading performance, heat generation and deterioration of the material to be kneaded during kneading can be suppressed, and high shearing is possible and kneading can be performed in a short time, thereby shortening the length of the apparatus. be able to. Further, it is not necessary to reduce the rotational speed of the screw set 3, and no remill is required, so that productivity can be improved.

  FIG. 6 is a graph showing the relationship between h / D of the kneading part, shear force ratio, and heat generation rate ratio in the continuous kneading apparatus showing Example 2 of the present invention. This figure shows the relationship in which the rotational speed of the screw set is set in three stages: high speed, medium speed, and low speed.

  In this embodiment, in each of the zones A to C in the first embodiment, a clearance (chip clearance) h formed between the screw 5, 9 and the blade tip of the kneading rotor 7 and the inner wall surface of the chamber 13, and the chamber In this example, h / D, which is the ratio of the inner diameter D of 13, is set to be 0.01 or more (see FIGS. 1 to 3). That is, under the above conditions, the tip clearance h is gradually increased toward the downstream side in the extrusion direction of the material to be kneaded, or all the tip clearances h are made largely constant. Since other configurations are the same as those in the first embodiment, a duplicate description will be omitted with reference to the description of the first embodiment.

As an experiment for deriving the relationship shown in FIG. 6, first, a shearing force τ ₀ when a conventional kneading apparatus (h / D = 0.002 of the kneading part) is rotated at a low speed (50 rpm) and the material to be kneaded is kneaded and The heat generation rate Q ₀ was measured. Next, changes in the shearing force τ _L and the heat generation rate Q _L when the chip clearance h was increased and h / D was increased under the same conditions (low speed rotation, material to be kneaded, inner diameter D) were examined. Further, changes in the shear forces τ _M and τ _H and the heat generation rates Q _M and Q _H during the medium speed rotation and the high speed rotation (200 rpm) were also examined.

Based on these experiments, the ratio (τ / τ ₀ , Q / Q ₀ ) of the shearing force τ and the heating rate Q to the shearing force τ ₀ and the heating rate Q ₀ as a reference is calculated, and The relationship between h / D, shear force ratio, and heat generation rate ratio is shown in the graph.

  As shown in the figure, it can be seen that at any rotational speed, the shearing force τ and the heat generation rate Q decrease as h / D increases, that is, as the tip clearance h increases. Further, in the comparison of the reduction rate of the shearing force τ and the heating rate Q, the shearing force gradually decreases and becomes constant at about 50% (half the conventional shearing force) as h / D increases. It can be seen that the speed drops sharply to about 10% or less.

  It can also be seen that in order to maintain a constant shear force τ, h / D must be increased as the rotational speed is increased. This is because even with the same chip clearance, the shearing force increases as the rotational speed increases, and the heat generation speed increases. Therefore, when the rotational speed is increased, h / D is increased to decrease the shearing force to generate heat. This is because it is necessary to reduce the speed.

  From the above, it is possible to suppress the heat generation of the material to be kneaded by increasing h / D. On the other hand, by increasing h / D, the shearing force τ indicating the kneading performance is also reduced. Become.

  Therefore, in order to suppress the heat generation of the material to be kneaded, h / D may be 0.01 or more, preferably 0.02 or more, more preferably 0.04 or more. In addition, in order to suppress a decrease in the kneading performance of the present embodiment compared with the kneading performance that the conventional kneading apparatus had, h / D is 0.12 or less, preferably 0.1 or less. Preferably it may be 0.08 or less.

  According to the present embodiment, by setting h / D within the above range, in addition to the operations and effects of the first embodiment, an advantage that heat generation can be remarkably suppressed can be obtained.

  In this embodiment, since the tip clearance h is set to be relatively large, the material to be kneaded is unevenly distributed in the chamber 13, and the kneading roller 7 or the like is not easily held evenly in the chamber 13. In addition, it is possible to prevent the inner wall surface of the chamber 13 and the tip of the blades such as the kneading rotor 7 from coming into contact with each other and wear, and the device life can be extended.

  FIG. 7 is an explanatory view of the structure of a single-screw kneading extruder showing Example 3 of the present invention. The single-screw kneading extruder 40 shown in the figure and the twin-screw kneading extruder 1 shown in FIG. 1 have the same configuration except that the number of shafts and the shape of the barrel 41 associated therewith are different. Therefore, common reference numerals are given to the configurations corresponding to the both.

  Also in this embodiment, the barrel 41 is divided into three zones A to C in the axial direction, and the heat medium flow paths 14a to 14c (see FIG. 2) are arranged in the barrel 41 in order to control the temperature of the material to be kneaded for each zone. By forming inside, the same operation and effect as Example 1 are obtained.

  FIG. 8 is a schematic configuration diagram showing a kneading system according to the fourth embodiment of the present invention, in which a batch kneader is applied to master kneading and a single biaxial kneading extruder is applied to remilling and final kneading. The twin-screw kneading extruder 53 shown in the figure has two kneading sections of the continuous kneading apparatus according to the first embodiment, and the first kneading section (upstream side) performs kneading equivalent to the remill, and the second kneading section. In the part (downstream side), final equivalent kneading is performed.

  In this kneading system, the raw rubber and the compounding agent are first kneaded (master kneading) using the batch kneader 50. In the batch kneader 50, the material to be kneaded is discharged when the BIT (Black carbon incorporate time) in which the raw rubber and the compounding agent are integrated is reached.

The discharged material to be kneaded is put into a twin-screw kneading extruder 53, and kneading equivalent to remilling is performed in the upstream section. In this kneading step, as in Example 1, the barrel is divided into a plurality of zones in the axial direction, and the temperature control of the material to be kneaded is performed for each zone using, for example, control patterns I, II-a, and III in FIG. Therefore, the kneading can be performed while the kneading is performed with substantially the same performance as the conventional kneading performance and the heat generation of the material to be kneaded is remarkably suppressed. For this reason, it is not necessary to perform a remill process many times, and a process can be continuously advanced to the final final kneading | mixing by letting a kneading part pass once.

  Next, after the vulcanizing agent is added, final equivalent kneading is performed in the downstream section of the twin-screw kneading extruder 53. Also in this kneading step, kneading can be performed with the above-described effects, that is, kneading with substantially the same performance as the conventional kneading performance, while significantly suppressing the heat generation of the material to be kneaded. Then, after the final kneading is completed, the rubber material taken out from the biaxial kneading extruder 53 is molded by the molding machine 54 and used as a material for rubber products such as tires.

  Note that a vulcanization step in which a vulcanizing agent is subjected to a crosslinking reaction by heating or the like may be provided on the downstream side of the molding machine 54. When the biaxial kneading extruder 53 itself has a molding function, the molding machine 54 may be omitted.

  As described above, according to this kneading system, since the remilling process can be completed at once, the process can be continuously advanced to final kneading, and the time required for the work can be shortened to improve the productivity. Can be made.

  FIG. 9 shows a fifth embodiment of the present invention, in which a batch kneader is applied to master kneading, a single twin-screw kneading extruder is applied to remilling and final kneading, and an underflow is provided downstream of the batch kneading machine. It is a schematic block diagram which shows the kneading | mixing system which is equipped with a mixer and a cooler and performs a remill.

  The kneading system according to the present embodiment is a modification of the kneading system according to the fourth embodiment, and an undermixer 51 and a cooling device 52 are installed between the kneading machine 50 and the biaxial kneading extruder 53.

In the present embodiment, the material to be kneaded taken out from the kneading machine 50 is made into a sheet by the undermixer 51, cooled by the cooling device 52, put into the biaxial kneading extruder 53, and molded by the molding machine 54. . Alternatively, after being cooled by the cooling device 52, it is returned again to the kneading machine 50 and master kneaded. This remilling process is performed once or a plurality of times, and thereafter, it is put into a biaxial kneading extruder 53 and molded by a molding machine 54. In the biaxial kneader-extruder 53, the barrel is divided into a plurality of zones in the axial direction as in the first embodiment, and the control patterns I and II shown in FIG.
-B, III is used to control the temperature of the material to be kneaded, so that kneading can be performed while suppressing the heat generation of the material to be kneaded while performing kneading with almost the same performance as conventional kneading performance. . For this reason, it is not necessary to perform a remill process many times, and a process can be continuously advanced to the final final kneading | mixing by letting a kneading part pass once.

  The kneading system according to the present example is suitable for kneading where it is difficult to disperse the compounding agent in the material to be kneaded such as raw rubber.

  FIG. 10 is a schematic configuration diagram showing a kneading system according to Example 6 of the present invention, in which a batch kneader is applied to master kneading, and two biaxial kneading extruders are respectively applied to remilling and final kneading. The two twin-screw kneading extruders 53a and 53b shown in the figure are kneading apparatuses according to the first embodiment (see FIGS. 1 to 3), and the two-screw kneading extruder 53a (upstream side) performs remilling. In the biaxial kneading extruder 53b (downstream side), final kneading is performed. A batch kneader may be used in place of the downstream twin-screw kneading extruder 53b.

In the kneading system according to the present embodiment, master kneading is performed by the batch kneader 30, and the material to be kneaded after the master kneading is put into the biaxial kneading extruder 53a and remilling is performed. In this remill process, as shown in Example 1, the barrel of the twin-screw kneading extruder 53a is divided into a plurality of zones in the axial direction, and the control patterns I, II-a, II shown in FIG.
Since the temperature of the material to be kneaded is controlled using I, it is possible to perform kneading while greatly suppressing the heat generation of the material to be kneaded while performing kneading with performance almost equivalent to the conventional kneading performance. For this reason, it is not necessary to perform the remill process many times, and the process can be continuously advanced to the subsequent final kneading by passing the biaxial kneading extruder 53a once.

  Next, after the vulcanizing agent is added, final kneading is performed in the twin-screw kneading extruder 53b. Also in the final kneading step, kneading can be performed with the above-described effects, that is, kneading with substantially the same performance as the conventional kneading performance, while significantly suppressing the heat generation of the material to be kneaded. Then, after the final kneading is finished, the rubber material taken out from the twin-screw kneading extruder 53b is molded by the molding machine 54 and used as a material for rubber products such as tires.

  In the present embodiment, it is possible to design a plurality of final kneading lines by changing the type and amount of additives to be added, or to set a plurality of molding shapes by adopting a configuration in which they are once taken out after remilling. It is possible to expand the range of application development.

  FIG. 11 shows a seventh embodiment of the present invention, in which a batch kneader is applied to master kneading, two biaxial kneading extruders are applied to remilling and final kneading, respectively, and a biaxial kneading extruder for remilling is used. It is a schematic block diagram which shows the kneading | mixing system which performs a remill by.

  The kneading system according to the present embodiment is a modification of the kneading system according to the sixth embodiment, and the material to be kneaded taken out from the biaxial kneading extruder 53a is returned to the biaxial kneading extruder 53a again. In Example 6, the remilling process in the twin-screw kneading extruder 53a was performed only once, but in this example, this remilling process is performed a plurality of times. Thereafter, it is put into a biaxial kneading extruder 53 b and molded by a molding machine 54. For final kneading, a batch kneading apparatus may be used instead of the biaxial kneading extruder 53b.

  11 is performed by circulating only the biaxial kneading extruder 53a, the material to be kneaded taken out from the biaxial kneading extruder 53a is returned to the kneader 50 and biaxial kneading. A remill process in which the extruder 53a and the kneader 50 are circulated may be used.

  The kneading system according to this embodiment is suitable for kneading in which it is difficult to disperse the compounding agent in the material to be kneaded such as raw rubber.

  The continuous kneading apparatus and the kneading system having the apparatus according to the present invention can be applied not only to a material to be kneaded made of rubber or rubber to which various compounding agents are added, but also to a material to be kneaded made of resin or the like.

It is structure explanatory drawing of the twin-screw kneading extruder which shows Example 1 of this invention. It is a barrel sectional view. It is a systematic diagram of cooling water and warm water. It is a control flow of temperature adjustment. It is a control pattern of temperature adjustment. It is a graph which shows the relationship between h / D of a kneading part in the continuous kneading apparatus which shows Example 2 of this invention, shear force ratio, and a heat release rate ratio. It is structure explanatory drawing of the single screw kneading extruder which shows Example 3 of this invention. It is Example 4 of this invention, and is a schematic block diagram which shows the kneading | mixing system which applied the batch type kneader to master kneading | mixing, and applied one biaxial kneading extruder to the remill and final kneading | mixing. Example 5 of the present invention, where a batch kneader is applied to master kneading, a single twin-screw kneading extruder is applied to remilling and final kneading, and an undermixer and a cooler are provided downstream of the batch kneading machine. It is a schematic block diagram which shows the kneading | mixing system which is equipped with and performs a remill. It is Example 6 of this invention, and is a schematic block diagram which shows the kneading | mixing system which applied the batch type kneader to master kneading | mixing, and applied the two biaxial kneading extruders to remill and final kneading, respectively. Example 7 of the present invention, where a batch kneader is applied to master kneading, two twin-screw kneading extruders are applied to remill and final kneading, respectively, and re-milling is performed using a twin-screw kneading extruder for remilling. It is a schematic block diagram which shows the kneading | mixing system to perform.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 2 axis | shaft kneading extruder, 2 barrel, 3 screw set, 4 rotary shaft, 5 screw, 6 feed part, 7 kneading rotor, 8 kneading part, 9 screw, 10 extrusion part, 13 chamber, 14a-14c Heat medium flow path , 16A cooling water supply tank, 16B cooling tank, 17 cooling water piping, 19A hot water supply tank, 19B heating tank, 20 hot water piping, 40 single-screw kneading extruder, 41 barrel, 50 kneading machine, 51 under mixer, 52 cooling device 53, twin-screw kneading extruder, 54 molding machine, h chip clearance, D chamber inner diameter, AC zone.

Claims (12)

A screw set with wings on the outer surface of the rotating shaft;
A continuous kneading device having a barrel formed by arranging the screw set in a cylindrical chamber,
A continuous kneading apparatus, wherein the barrel is divided into a plurality of zones in the axial direction, and a heat medium flow path is formed inside the barrel so as to control the temperature of the material to be kneaded for each zone.   The continuous kneading apparatus according to claim 1, wherein the barrel is divided into three zones corresponding to a feed part, a kneading part, and an extruding part in the screw set.   The continuous kneading apparatus according to claim 1 or 2, wherein any one of cold water, hot water, and mixed water of cold water and hot water is supplied to the heat medium flow path.   The continuous kneading apparatus according to claim 1, 2 or 3, wherein the continuous kneading apparatus is a twin-screw kneading extruder.   6. The continuous kneading apparatus according to claim 5, wherein the wings provided on the outer surface of the rotating shaft have a structure in which the two blades mesh with each other.   6. The continuous kneading apparatus according to claim 5, wherein the wings are configured to engage with each other between two axes over the entire length or part of the rotary shaft.   4. The continuous kneading apparatus according to claim 1, wherein the continuous kneading apparatus is a single-screw kneading extruder.   The continuous kneading apparatus according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the continuous kneading apparatus kneads rubber or a rubber-based composition.   2. The h / D, which is a ratio of the gap h formed between the tip of the wing and the inner wall surface of the chamber, and the inner diameter D of the chamber, is 0.01 or more. , 2, 3, 4, 5, 6, 7 or 8.   A kneader for master kneading and a continuous kneading device provided downstream of the kneader, wherein the continuous kneading device is the continuous kneading device according to any one of claims 1 to 9. Kneading system.   A kneader for master kneading, an undermixer and a cooling device provided downstream of the kneader, and a continuous kneading device provided downstream of the cooling device, wherein the continuous kneading device is claimed in claims 1 to A kneading system, which is the continuous kneading apparatus according to any one of 9. The continuous kneader includes a first continuous kneader provided downstream of the master kneader for remilling and a second continuous kneader provided downstream of the first continuous kneader for final kneading. The kneading system according to claim 10 or 11, comprising a kneading device.

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