JP2005088291A - Pellet regenerating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To materialize a pellet regenerating apparatus converting a waste plastic material into regenerated pellets and having a cooling function which can prevent viscosity lowering associated with temperature elevation by the shearing heat of a molten resin generated during the kneading/melting of a resin material by a cylinder by using a cooing means and adjust/control temperature to obtain viscosity facilitating the induction of the molten resin to a cutter part and the disintegration of the molten resin. <P>SOLUTION: The pellet regenerating apparatus has a resin temperature detection means for detecting the temperature of the resin material in the cylinder, the cooling means for cooling the outer wall of the cylinder, and a control means for actuating the cooling means when the temperature elevation by the shearing heat generated during the plastication of the resin material is detected by the detection means. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  Synthetic resin products are made by kneading and melting various types of resin materials consisting of waste plastic materials such as work waste, defective products, or plastic waste generated during plastic injection molding, using a cylinder, cooling, and pulverizing with a pulverizer. In particular, the present invention relates to a pellet regenerating apparatus capable of performing a cooling process corresponding to a molten resin material having different physical properties.

  Pellet recycling equipment is generally composed of hoppers, feeders, cylinders, pellet liners, cutter parts, etc. that receive and process plastic fragments made of waste plastic material crushed by a pulverizer. Or each kind of resin material which consists of waste plastic materials, such as a waste material, is reproduced | regenerated, and the pellet used as the raw material of a synthetic resin product is manufactured again. The cylinder provided in the pellet regenerator is used, for example, in a screw type injection regenerator, and takes in resin fragments supplied to the hopper through a feeder and kneads them by rotation of an injection screw provided in the cylinder. The resin material to be sent is heated by a heater installed on the outer periphery of the cylinder to be melted and provided at the tip of the cylinder along the groove of the injection screw. It is injected from the injection nozzle part.

  The cylinder generally includes a supply zone (referred to as Z81) for supplying a resin material, a compression zone (referred to as Z82) for kneading and melting the resin material, and a measurement zone (Z83) for measuring the amount of molten resin material that is kneaded and melted. The temperature of the outer wall surface of each zone of the cylinder is heated by the respective heaters installed on the outer wall surface of each zone, and the lead time (t81 corresponding to the operation time of the pellet regenerating apparatus) The resin material is set to be kneaded and melted. And the pellet used as the raw material of a synthetic resin product is induced | guided | derived by the induction grinding | pulverization part (it is called Z84) which guide | induces the molten resin injected from the injection nozzle of the cylinder to a cutter part with a pellet liner, and grind | pulverizes with a cutter part.

  The outer wall surface temperature of each zone (Z81, Z82, Z83) is a preset temperature at which the temperature of the molten resin to be injected after being kneaded and melted (the trouble is caused by a decrease in the viscosity of the molten resin due to the temperature increase of the molten resin). A predetermined temperature (a temperature necessary for bringing the resin material into a molten state, for example, 200 ° C.) is set so as to be within a temperature range where it does not occur (for example, 150 ° C.). The predetermined temperature (for example, 200 ° C.) of the outer wall surface heated by the heaters in each zone (Z81, Z82, Z83) is controlled by the heater through detection data from the outer wall temperature sensor installed on each outer wall surface. .

  And in compression zone Z82, it is formed so that the depth of the groove of an injection screw may become small gradually, ie, the valley diameter of the groove bottom part of an injection screw may become large gradually. Therefore, in the compression zone Z82, as the injection screw rotates, the resin material sent from the supply zone Z81 undergoes compression and kneading while being melted as it advances forward. For example, the ratio (corresponding to the compression ratio) of the groove having a large depth and the groove having a small depth is usually set in a range of 2 to 3 times. In the measurement zone Z83, the resin material is further homogenized while being further kneaded and sent to the tip of the injection screw. In the measurement zone Z83, the amount of molten resin to be melt-kneaded is measured, and the production amount of pellets regenerated within the lead time t81 is set and controlled.

  The outer wall surface temperature of each zone (Z81, Z82, Z83) of this cylinder is heated and controlled by each heater to a predetermined temperature (eg, 200 ° C.), and the supplied resin material is melted. During the kneading and melting movement of the resin material by the rotation of the screw, the temperature of the molten resin can rise above a preset temperature (for example, 150 ° C.) due to the generated shear heat. In particular, this shear heat is likely to occur after the post-process in the compression zone where the valley diameter of the groove bottom of the injection screw is set to 2 to 3 times (corresponding to the compression ratio of the resin material).

  Due to the temperature rise exceeding the set temperature (for example, 150 ° C.) of the molten resin, the viscosity of the molten resin material is lowered depending on the type of resin material to be supplied.

  In particular, in a molten resin material whose viscosity rapidly decreases with an increase in temperature, for example, a biodegradable plastic, since the molten resin whose temperature has been increased due to shear heat is injected, the molten resin whose viscosity has rapidly decreased is induced by grinding. There is a risk of causing trouble or the like due to sticking to the duct or the like at the part (referred to as Z84).

  That is, in this pellet recycling apparatus, for example, shear heat is generated at the time of melt kneading in the vicinity of the subsequent step of the compression zone Z82, and the rising temperature exceeding the set temperature (for example, 150 ° C.) of the molten resin is a molten resin temperature sensor (for example, Temperature sensor so as to stop the heating of the heater installed on the outer wall surface of the measurement zone Z83 and lower the temperature of the molten resin. The amount of heat corresponding to the rising temperature of the molten resin in which shear heat is generated cannot be reduced within the lead time t81.

  Next, an example of temperature control by this heater will be described with reference to FIG.

  FIG. 9 is an explanatory diagram showing an example of the rising temperature characteristic of the molten resin material due to the shear heat generated when the resin material is melt-kneaded by the cylinder of the conventional pellet recycling apparatus.

  As shown in FIG. 9, the operation time (lead time) of the entire process of pelletizing the resin material by the pellet recycling apparatus is such that the supplied resin material is kneaded and melted through each zone (Z81, Z82, Z83) of the cylinder. The time from when the injected molten resin is pulverized by the induction pulverization unit Z84 to regenerate the pellets as the raw material of the synthetic resin product is set to a predetermined time t81. . Then, it is assumed that shear heat due to compression kneading of the molten resin due to the rotation of the injection screw within the lead time t81 is generated in the vicinity of the subsequent step (point A82) of the compression zone Z82. The temperature curve of the outer wall surface in each zone of the cylinder is indicated by a curve C81 in FIG. 9, and the temperature curve for melting and kneading the resin material in each zone is indicated by a curve C82 in FIG.

  The outer wall surface temperature in each zone of the cylinder is, for example, a predetermined temperature T80 (a temperature required to bring the resin material into a molten state, for example, equivalent to 200 ° C.) as shown by a temperature curve C81 in FIG. As described above, the heating is controlled by the temperature detection data of the outer wall surface by the heaters and the outer wall temperature sensors installed on the outer wall surface of each zone. Then, the rising temperature t81 of the molten resin due to the shearing heat of the molten resin generated in the vicinity of the subsequent step (point A82) of the compression zone Z82 is detected by a molten resin temperature sensor that measures the molten resin temperature installed in the compression zone Z82. When this occurs, the heater installed on the outer wall surface of the adjacent measurement zone Z83 is turned off. Thereby, the outer wall surface temperature of measurement zone Z83 falls slightly from predetermined temperature T80 to T81.

  On the other hand, the temperature of the supplied resin material in the supply zone Z81 is, for example, from room temperature because the outer wall surface of the cylinder is heated by a heater and controlled to a predetermined temperature T80 as shown by a temperature curve C82 in FIG. The temperature is raised to a set temperature t80 (in a temperature range where the resin material is melted and trouble does not occur due to a decrease in viscosity, for example, set to 150 ° C.). In the vicinity of the post-process in the supply zone Z81 (point A81 in FIG. 9), the supplied resin material is in a molten state. The temperature of the molten resin in the compression zone Z82 is, for example, the vicinity of the subsequent process of the compression zone Z82 (point A82) as shown in the temperature curve C82 in FIG. It rises to a temperature exceeding the set temperature t80 due to the shear heat of the molten resin generated in step (b). When this increased temperature is detected by a molten resin temperature sensor that measures the temperature of the molten resin installed in the compression zone Z82, the heater installed on the outer wall surface of the measurement zone Z83 is turned off, and the molten resin is temperature controlled. Is done. As a result, the temperature of the molten resin in the measurement zone Z83 falls slightly to the temperature t81 within the lead time t81, but cannot be lowered to the set temperature t80.

  If the generation of shear heat of the molten resin occurs in the vicinity of the intermediate process of the compression zone Z82, the heater installed on the outer wall surface of the compression zone Z82 is also turned off, but the temperature of the molten resin is set to the set temperature t80. Can not be lowered. In addition, since the rising temperature of the molten resin may exceed a predetermined temperature T80 on the outer wall surface of the cylinder, even if the heater is turned off to lower the rising temperature of the molten resin, the temperature rises higher than the set temperature t80. Therefore, the temperature rise by the heater cannot suppress the temperature rise of the molten resin.

  Then, after finishing the measurement zone Z83, the molten resin material whose temperature has risen injected from the injection nozzle of the cylinder is guided from the pellet liner to the cutter unit in the next induction crushing unit Z84, and is pulverized within a predetermined time t81. The pellet used as the raw material of a resin product will be manufactured.

  Therefore, when the injected molten resin is guided to the cutter part through the pellet liner equipped with the duct, the viscosity rapidly decreases due to the temperature rise of the molten resin. In addition, when the molten resin is pulverized in the cutter part, the molten resin sticks to the cutter part and is difficult to pulverize.

  Next, examples of proposals by other methods will be described.

  The first conventional pellet recycling apparatus does not control the temperature increase due to shear heat generated during kneading and melting of the resin material by cooling the outer wall surface of the cylinder itself, but the molten resin injected from the cylinder. Direct cooling treatment is performed. This molten resin cooling process is a combination of a water-cooled cooling method that cools using a water-cooled tank and an air-cooled cooling method that air-cools when conveyed by a conveyor. In addition, it is based on a water-cooling / air-cooling system that cools to a temperature at which a viscosity suitable for induction into a pellet liner and pulverization by a cutter unit is obtained (for example, see Patent Document 1).

  In the injection molding apparatus for molding a plastic product as a second conventional example, heat is applied to the nozzle portion for injecting the molten resin into the molding die portion by the shearing force of the molten resin by injection (such as the injection speed of the molten resin). The higher the injection speed, the larger the value of the shear heating value), and the preset temperature of the molten resin increases. In order to suppress the increase in the set temperature, the injection speed Is adjusted and controlled, and the temperature of the cylinder heated by the heater is adjusted and controlled (see, for example, Patent Document 2). The injection speed adjustment control and the control method for adjusting the temperature of the outer wall surface of the cylinder are mainly plastic products molded by a mold provided in the injection apparatus by reducing the temperature variation of the injected molten resin. It was used to improve the quality.

  In addition, the injection molding apparatus for molding plastic products, which is a third conventional example, is provided with a cooling device comprising a hot water jacket by removing the heater installed in the supply zone of the cylinder, and the supplied resin is melted. Some are cooled so that the viscosity does not decrease, and the resin is easily supplied to the compression zone (see, for example, Patent Document 3).

Prior art documents relating to the invention of this application include the following.
Registered Utility Model No. 3036243 JP-A-6-246808 Japanese Patent Laid-Open No. 5-69462

  As described above, in the pellet recycling apparatus, the temperature increase due to the shearing heat generated when the resin material supplied by heating the outer wall surface of the cylinder with a heater is melted and kneaded by rotation of the injection screw. In the lead time for pelletization, since the cooling cannot be suppressed just by stopping the heating by the heater, the temperature of the injected molten resin exceeds the preset temperature. For this reason, in resin materials in which the viscosity of the molten resin rapidly decreases with increasing temperature, such as biodegradable plastics, when the molten resin is guided to the cutter part, the molten resin sticks to the duct, leading to induction. In addition, when the molten resin is pulverized in the cutter part, the molten resin sticks to the cutter part and is difficult to pulverize.

  And, according to the first conventional example, the temperature rise due to the shear heat is not controlled by cooling the outer wall surface of the cylinder itself, but the molten resin injected from the cylinder is treated with a water-cooled treatment by a water-cooled tank. Although there is one in which cooling processing is performed using air cooling processing by a conveyor, this conventional example has a problem that the structure is complicated, the cost is high, and a large space is required.

  Further, according to the second and third conventional examples, a control method for adjusting the injection speed provided in the injection molding apparatus, a control method for adjusting the outer wall surface temperature of the cylinder, and hot water provided in the supply zone of the cylinder The cooling device using the jacket is difficult to apply in the pellet recycling apparatus because there is no need to set a large injection speed and it is not necessary to cool only the supply zone of the cylinder.

  The present invention has been made in view of the above problems, and without using a water-cooled tank and a conveyor having an air-cooling function, the amount of temperature rise exceeding the set temperature of the molten resin due to shear heat is transferred to the outer wall surface of the cylinder itself. Cooling that can be controlled by cooling, or by directly cooling the injected molten resin so that the viscosity can be easily adjusted so that the molten resin is easily guided to the cutter part and pulverized by the cutter part. An object is to realize a pellet recycling apparatus having a processing function.

  In order to achieve the above object, the present invention provides a resin temperature for detecting a temperature of a resin material in the cylinder in a pellet recycling apparatus that includes a cylinder for melting and kneading a resin material and regenerates a pellet using the molten resin material. Detection means, cooling means for cooling the outer wall of the cylinder, and control means for operating the cooling means when the resin temperature detection means detects an increase in temperature due to shear heat generated during plasticization of the resin material. It is characterized by this.

  Further, in a pellet recycling apparatus that includes a cylinder for melting and kneading the resin material, and regenerating the pellet by cutting the molten resin material at the cutter unit, the resin material injected from the cylinder is guided to the cutter unit by air flow It is characterized by providing guiding means for performing.

  Further, in a pellet recycling apparatus that includes a cylinder that melts and kneads the resin material and regenerates the pellet by cutting the melted resin material with a cutter unit, a rotating means that rotates the cylinder in an inverted direction is provided, and the rotating means The cylinder is inverted, and the molten resin material injected from the cylinder is guided to the cutter portion by its own weight.

  According to the present invention, the temperature of the molten resin can be reduced by using the cooling means even when a decrease in the viscosity rate accompanying the temperature increase exceeding the set temperature due to the shear heat of the molten resin occurs during the kneading and melting of the resin material by the cylinder. Cooling control of the ascending amount or guiding the molten resin injected into the cylinder to a predetermined position of the cutter unit by a movement guiding means, etc. The guidance and crushing at the cutter part can be easily adjusted and controlled.

Embodiments of the present invention will be described below with reference to the drawings.

  The cooling control mechanism unit 20 of the pellet recycling apparatus 1 according to the first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a cooling control mechanism part of a pellet regenerating apparatus according to the first embodiment of the present invention, (a) is an external view explanatory diagram, (b) is a block diagram of the cooling control mechanism part, FIG. 2 is an explanatory view showing an example of a resin control temperature in the petification of the resin material by the cylinder of the pellet regenerating apparatus according to the first embodiment. The same components from those according to the first embodiment to those according to the fifth embodiment will be described in the pellet recycling apparatus according to the first embodiment, and will be described in the following embodiments. Is omitted.

  The pellet recycling apparatus 1 according to the first embodiment of the present invention includes, for example, as shown in FIG. 1A, a feeder (not shown) to which resin fragments made of waste plastic material are supplied and guided. A cylinder 2 that kneads and melts resin shards including a hopper 10, an injection screw 3, an injection nozzle unit 4, heaters 6a, 6b, and 6c, a drive control unit 5 that rotationally drives the injection screw 3, and a molten resin into a cutter unit 9. It includes a pellet liner 7 having a duct 8 for guiding, a cutter unit 9 for pulverizing molten resin into pellets, a cooling control mechanism unit 20 for cooling the molten resin injected from the cylinder 2 to a set temperature, and the like.

  In the pellet recycling apparatus 1, the cooling control mechanism 20 is mounted at a position close to the outer wall surface of a predetermined portion (for example, the measurement zone Z23) of the cylinder 2, and the molten resin in the compression zone 22 or the like is installed. Even if shearing heat is generated during compression kneading, the amount of heat corresponding to the rising temperature of the molten resin due to the generated shearing heat is suppressed from being cooled, and the temperature of the molten resin injected from the cylinder 2 causes the molten resin to be removed by the cutter unit 9. Cooling control is performed so as to reach a preset temperature (for example, 150 ° C.) at which a viscosity is obtained that easily guides to the melt and can easily pulverize the molten resin in the cutter unit 9.

  The cylinder 2 measures the amount of the molten resin material to be kneaded and melted and the supply zone (referred to as Z21) for supplying the resin material, the compression zone for kneading and melting the resin material (referred to as Z22), as in the conventional case. The heaters 6c, 6b, 6a and the outer wall temperature sensors 27c, 27b, 27a are mounted on the outer wall surfaces of the zones, respectively. The compression zones Z22 and the measurement zones Z23 Molten resin temperature sensors 26a and 26b for detecting the temperature of the molten resin are mounted on the outer wall surface, respectively, and have a function of kneading and melting resin fragments including the injection screw 3, the injection nozzle portion 4 and the like.

  A cooling control mechanism 20 is additionally provided on the outer wall surface of a predetermined portion of the cylinder 2 (for example, the measurement zone Z23), and even when shear heat is generated during compression kneading of the molten resin in the compression zone 22 or the like. The amount of heat corresponding to the temperature rise of the molten resin due to the generated shearing heat is cooled and suppressed.

  In the compression zone Z22 of the cylinder 2, as shown in FIG. 1A, the valley diameter at the bottom of the groove of the injection screw 3 is formed so as to gradually increase from D1 to D2 (D2 / D1 = compression). Therefore, the molten resin that has started to melt and is fed from the supply zone Z21 is further melted and compressed and kneaded. Therefore, during the kneading and melting movement of the compression zone Z22, particularly, the heat of the molten resin is easily generated in the subsequent process of the compression zone Z22, and the temperature of the molten resin exceeds a preset temperature (for example, 150 ° C.). Will rise.

  The temperature that rises above the set temperature of the molten resin (for example, 150 ° C.) is detected by a molten resin temperature sensor 26b that measures the temperature of the molten resin installed on the outer wall surface of the compression zone Z22. The amount of heat corresponding to the increased amount is suppressed by the cooling control mechanism unit 20 mounted on the outer wall surface of the measurement zone Z23 adjacent to the compression zone Z22. The cooling control by the cooling control mechanism 20 is performed by the heater 6a installed on the outer wall surface of the measurement zone Z23 when the temperature rise of the molten resin is detected by the molten resin temperature sensor 26b installed on the outer wall surface of the compression zone Z22. Is performed in a state of being controlled OFF.

  The cooling control mechanism unit 20 is divided into three parts from a pipe 24 for supplying compressed air, an opening / closing valve 25 for opening and closing a compressed air supply port, and a hopper 10 of a cylinder 2 mounted on the pipe 24 to an injection nozzle unit 4. Molten resin temperature for detecting the temperature of the molten resin attached to the measurement zone Z23 and the compression zone Z22 of the cylinder 2 and the electromagnetic valve 21 disposed opposite to a predetermined portion (for example, the measurement zone Z23) in the zone. Sensors 26a, 26b, outer wall temperature sensors 27a, 27b, 27c for detecting the outer wall temperature mounted on the outer wall surface of each zone of the cylinder 2, and the molten resin detected from the molten resin temperature sensors 26a, 26b. Based on the detected temperature, the heater heating control is turned off, the calculation unit 28 for calculating the cooling control flow rate and the like, and the control signal from the calculation unit 28 determines the compressed air A compressed air cooling control unit 29 that controls the flow rate, a cylinder heating control unit 11 that controls the amount of heat of the heater 6 by a control signal from the calculation unit 28, and the like.

  In the calculation unit 28, as shown in FIG. 1 (B), the outer wall surface temperature of each zone of the cylinder 2 is a predetermined temperature (the preset outer wall surface temperature of the cylinder 2 required for kneading and melting resin fragments). For example, the heating control calculation process is performed so that the temperature is 200 ° C., and the molten resin temperature in the compression zone Z22 and the measurement zone Z23 of the cylinder 2 is set to the set temperature (the viscosity of the molten resin decreases, causing trouble due to sticking, etc. The cooling control calculation processing is performed so as not to exceed a temperature within a range not to be performed (for example, 150 ° C.).

  In the heating control calculation process for the outer wall surface of each zone, the outer wall surface temperature detection value of each zone of the cylinder 2 detected by each outer wall temperature sensor 27a, 27b, 27c is set to each predetermined temperature (for example, 200 ° C.). ) And a process of controlling the heating by the heaters 6a, 6b, and 6c through the heater heating control unit 11 so that the outer wall surface temperature of each zone becomes a predetermined temperature.

  In the cooling control process, the molten tree temperature detection values detected by the molten resin temperature sensors 26a and 26b installed in the compression zone Z22 and the measurement zone Z23 of the cylinder 2 are set to preset temperature settings (for example, 150 ° C.), and by this comparison determination, it is determined that each detected temperature exceeds each set temperature (for example, 150 ° C.) due to a temperature rise associated with shear heat generated when the resin material is kneaded and melted. In this process, a flow rate of compressed air to the outer wall surface of the measurement zone Z23 necessary for cooling the amount of heat corresponding to the temperature rise of the molten resin is calculated, and cooling control is performed. That is, the heating control by the heater provided on the outer wall surface of the measurement zone Z23 of the cylinder 2 is switched to the stopped state, and the calculated compressed air flow rate signal is sent to the outer wall surface of the measurement zone Z23 via the compressed air cooling control unit 29. The flow rate of the compressed air calculated and sent to the electromagnetic valve 21 mounted at a position opposite to is blown from the blowing nozzle 22 to the outer wall surface of a predetermined portion (for example, the measurement zone Z23), and the rise of the molten resin The amount of heat corresponding to the temperature component is suppressed from cooling. The compressed air is sent to the electromagnetic valve 21 through the pipe 24 from the direction of the arrow F21 by opening the open / close valve 25 which is a compressed air supply port.

  Thereby, the outer wall surface of the predetermined part (for example, measurement zone Z23) of the cylinder 2 is cooled, and the temperature of the molten resin injected from the injection nozzle unit 4 is controlled to be cooled to the set temperature (for example, 150 ° C.). become.

  The electromagnetic valve 21 includes a spray nozzle 22 and is attached to a pipe 24. The electromagnetic valve 21 receives the control signal of the calculated compressed air flow rate from the calculation unit 28 via the compressed air flow rate control unit 29, and the received compressed air flow rate is supplied from the spray nozzle 22 to the predetermined cylinder 2. It sprays on the outer wall surface of a site | part (for example, measurement zone Z23), and cools the predetermined site | part (for example, measurement zone Z23) of the cylinder 2.

  As described above, the heater 6 mounted on the outer wall surface of the cylinder 2 controls the heating of the outer wall surface of each zone of the cylinder 2 and the cooling to the outer wall surface of a predetermined portion of the cylinder 2 (for example, the measurement zone Z23) by the compressed air. When the control is used in combination, the amount of heat corresponding to the temperature rise due to the shear heat of the molten resin generated in the vicinity of the post-process of the compression zone Z22 is suppressed from cooling, and the temperature of the molten resin is cooled to a set temperature (for example, 150 ° C.). Will be suppressed. And the calculating part 28, the compressed air flow control part 29, and the cylinder heating control part 11 are incorporated in the control unit which is not shown in figure.

  Next, an example of temperature control of the outer wall surface of the cylinder 2 and melting temperature control of the resin material by the cooling control mechanism unit 20 will be described with reference to FIG.

  As shown in FIG. 2, the operation time (lead time) of the whole process of pelletizing the resin material by the pellet recycling apparatus 1 is injected after the resin material is kneaded and melted through each zone (Z21, Z22, Z23) of the cylinder. Then, it is assumed that the predetermined time t21 is set until the injected molten resin is crushed by the induction pulverization unit Z24 and regenerated as pellets as a raw material of the synthetic resin product. Then, it is assumed that shear heat due to compression kneading of the molten resin due to the rotation of the injection screw within the lead time t21 is generated in the vicinity of the subsequent step (point A82) of the compression zone Z22. In addition, the temperature curve of the outer wall surface in each zone of the cylinder in the state in which the temperature rise due to the shear heat generated in the vicinity of the post-compression zone Z22 (point A82) is suppressed by the cooling control mechanism 20 is shown in FIG. A temperature curve indicated by a curve C21 and at which the molten resin is inhibited from being cooled in each zone is indicated by a curve C22 in FIG.

  For example, as shown in a temperature curve C21 in FIG. 2, the outer wall surface temperature in each zone of the cylinder is set to a predetermined temperature T20 (a temperature necessary for bringing the resin material into a molten state, for example, 200 ° C.) Heating control is performed by each heater installed on the outer wall surface of each zone. Then, the rising temperature t21 due to the shear heat of the molten resin generated in the vicinity of the post-process in the compression zone Z22 (point A22) is detected by the molten resin temperature sensor 26b that measures the molten resin temperature installed in the compression zone Z22. The heater 6a installed on the outer wall surface of the zone Z23 is turned off. And the outer wall surface of measurement zone Z23 is cooled by the cooling control mechanism part 20 with which the position facing the outer wall surface of measurement zone Z23 was mounted | worn. This cooling control process is performed by the calculation unit 28.

  In the cooling to the outer wall surface of the measurement zone Z23 by the cooling control mechanism unit 20, the amount of heat corresponding to the rising temperature (t21-t20) due to the shear heat of the molten resin is cooled within the lead time t21, and the temperature of the molten resin is set. This is performed to lower the temperature to a set temperature t20 (for example, 150 ° C.). Accordingly, in the cooling to the outer wall surface of the measurement zone Z23, the outer wall surface temperature of the measurement zone Z23 is calculated to be lower than the predetermined temperature T20 (for example, 150 ° C.) from the predetermined temperature T20 (for example, 200 ° C.). By controlling the cooling to the temperature T21, the rising temperature t21 of the molten resin falls to the set temperature t20 within the lead time t21.

  On the other hand, the temperature of the supplied resin material in the supply zone Z21 is, for example, as shown by a temperature curve C22 in FIG. 2, and the outer wall surface of the supply zone Z21 of the cylinder 2 is heated by the heater 6a to a predetermined temperature T20 (for example, 200 ° C.), the temperature is raised from room temperature to a set temperature t20 (within a temperature range where the resin material is melted and trouble does not occur due to a decrease in viscosity, for example, 150 ° C.). In the vicinity of the post-process in the supply zone Z21 (point A21 in FIG. 2), the supplied resin material is in a molten state.

  The temperature of the molten resin in the compression zone Z22 is controlled to a predetermined temperature T20 because the outer wall surface of the compression zone Z22 is heated by the heater 6b as shown in the temperature curve C22 of FIG. 2, for example. Is maintained at a set temperature t20 (for example, 150 ° C.) of the molten resin that has started to be melted and fed from the supply zone Z21. Then, due to the compression kneading of the molten resin in the compression zone Z22, shear heat of the molten resin is generated in the vicinity of the subsequent step (point A22) of the compression zone Z22, and the temperature of the molten resin rises to a temperature t21 exceeding the set temperature t20. Will do. The rising temperature t21 is detected by a molten resin temperature sensor 26b that measures the molten resin temperature installed in the compression zone Z22.

  The amount of heat corresponding to the temperature rise (t21-t20) due to the shear heat of the molten resin is OFF controlled for the heater 6a installed on the outer wall surface of the measurement zone Z23, and the position facing the outer wall surface of the measurement zone Z23. The cooling control mechanism unit 20 mounted on is operated via the calculation unit 28, and the outer wall surface temperature of the measurement zone Z23 is lower than a predetermined temperature (for example, 200 ° C.) to a set temperature (for example, 150 ° C.) of the molten resin. Cooling is controlled to the calculated temperature T21. Thereby, the temperature of the molten resin in the measurement zone Z23 can be lowered to the set temperature t20 within the lead time t21.

  Therefore, the molten resin injected from the injection nozzle 4 of the cylinder 2 after finishing the measurement zone Z23 is controlled to the set temperature by suppressing the rise in temperature, so that the cutter is passed through the pellet liner 7 provided with the duct 8. When guiding to the part 9, the molten resin does not stick to the duct 8 and is easy to guide, and when the molten resin is crushed by the cutter part 9, the molten resin does not stick to the cutter part 9. It becomes easy to grind.

  In addition, when the generation of shear heat of the molten resin occurs in the vicinity of the intermediate process of the compression zone Z22, the heater 6b installed on the outer wall surface of the compression zone Z22 is also turned OFF, and the outer wall surface of the compression zone Z22 is also controlled. The cooling control mechanism unit 20 is mounted to cool the outer wall surface of the compression zone Z22, and the amount of heat corresponding to the temperature increase of the molten resin can be suppressed. As a result, the amount of heat corresponding to the temperature rise of the molten resin is reliably suppressed by the cooling control mechanism 20 mounted in the compression zone Z22 and the measurement zone Z23 within the lead time t81, and the temperature of the molten resin is set. The temperature is lowered to t20.

  Further, when the temperature rise due to the shear heat of the molten resin (for example, t21 shown in FIG. 2) exceeds a predetermined temperature T20 on the outer wall surface of the cylinder, the cooling capacity by the cooling control mechanism 20 is further increased, The elevated temperature can be lowered to the set temperature t20. For example, by controlling cooling of the outer wall surface temperature exceeding a predetermined temperature (for example, 200 ° C.) to a temperature greatly lower than the set temperature (for example, 150 ° C.) of the molten resin, The amount of heat corresponding to the temperature rise is suppressed from cooling.

  Next, a cooling control method of the cooling control mechanism unit 20 of the pellet recycling apparatus 1 will be described with reference to FIG.

  FIG. 3 is a cooling control flowchart of the cooling control mechanism of the pellet regenerating apparatus according to the first embodiment of the present invention.

  First, this process starts when a power switch in a control unit (not shown) is turned on.

  In step S21, each heater 6c, 6b, 6a installed on the outer wall surface of each zone (supply zone Z21, compression zone Z22, measurement zone Z23) of the cylinder 2 of the pellet regenerator 1 is ON-controlled to control the temperature of the outer wall surface. Is heated until it reaches a predetermined temperature (for example, 200 ° C.), and the supplied resin material is melted to be controlled to a set temperature (for example, 150 ° C.).

  In step S22, the molten resin temperatures of the compression zone Z22 and the measurement zone Z23 are detected by the molten resin temperature sensors 26b and 26a installed on the outer wall surfaces of the compression zone Z22 and the measurement zone Z23.

  In step S23, it is determined whether or not the molten resin temperature ta of at least one of the compression zone Z22 and the measurement zone Z23 detected in step S22 exceeds a set temperature to (for example, 150 ° C.) (ie, The temperature rise due to the shear heat generated during plasticization of the resin material is detected). When it determines with NO, it progresses to the following step S24, detects the outer wall surface temperature of each zone (supply zone Z21, compression zone Z22, measurement zone Z23), and progresses to the following step S25. The detection of the outer wall surface temperature is performed by the respective outer wall surface temperature sensors 27c, 27b, and 27a installed on the outer wall surface of each zone (supply zone Z21, compression zone Z22, and measurement zone Z23). If YES is determined, the process proceeds to step S26, and if the zone where the molten resin temperature ta exceeds the set temperature to is, for example, the vicinity of the post-process in the compression zone Z22 or the measurement zone Z23, the measurement is performed. The heater 6a installed on the outer wall surface of the zone Z23 is turned off, and the process proceeds to the next step S27.

  When the zone where the molten resin temperature ta exceeds the set temperature to is in the vicinity of the subsequent process of the compression zone Z22, the heater 6b installed on the outer wall surface of the compression zone Z22 is divided and individually controlled for heating. By using this method, both the divided heater installed at a position opposite to the vicinity of the post-process in the compression zone Z22 and the heater 6a installed on the outer wall surface of the measurement zone Z23 are simultaneously controlled to be turned off to facilitate cooling suppression. be able to. However, when the zone where the molten resin temperature ta exceeds the set temperature to is in the vicinity of the subsequent process of the compression zone Z22 according to the present embodiment, the heater 6a installed on the outer wall surface of the measurement zone Z23 is simply turned off. Cooling suppression is possible. When the heater 6b installed on the outer wall surface of the compression zone Z22 is turned off, the temperature of the outer wall surface cannot be maintained at a predetermined temperature (for example, 200 ° C.) in the previous process in the compression zone Z22, and the resin material is melted. It will be insufficient.

  In step S25, it is determined whether or not the outer wall surface temperature Ta of each zone (supply zone Z21, compression zone Z22, measurement zone Z23) detected in step S24 exceeds a predetermined temperature To (for example, 200 ° C.). The When it determines with YES, it progresses to following step S26 and OFF control is carried out to the heater 6 installed in the outer wall surface of the zone where the melting wall surface temperature Ta exceeds predetermined temperature To (for example, 200 degreeC). If NO is determined, the process returns to step S21 and the operation is repeated.

  In step S26, in response to the determination in step S25 that the outer wall surface temperature Ta of each zone exceeds a predetermined temperature To (eg, 200 ° C.), the heater 6 on the outer wall surface of the exceeding zone is turned off. Control. In step S23, it is determined that the molten resin temperature ta in at least one of the compression zone Z22 and the measurement zone Z23 (for example, in the vicinity of the subsequent process of the compression zone Z22) exceeds a set temperature to (for example, 150 ° C.). In response to the result, the heater 6a installed on the outer wall surface of the measurement zone Z23 adjacent to the post-process of the compression zone Z22 is turned off. Then, only for the result determined in step S23, the heater 6a in the measurement zone Z23 is controlled to be OFF, and the process proceeds to the next step S27. The determination to proceed to step S27 and the switching process for performing the cooling control process are performed by the calculation unit 28.

  In addition, when the generation of shear heat of the molten resin occurs in the vicinity of the intermediate process of the compression zone Z22, the heater 6b installed on the outer wall surface of the compression zone Z22 is also turned OFF, and the outer wall surface of the compression zone Z22 is also controlled. The cooling control mechanism unit 20 is mounted to cool the outer wall surface of the compression zone Z22, and the amount of heat corresponding to the temperature increase of the molten resin can be suppressed.

  In step S27, after the heater 6a installed on the outer wall surface of the measurement zone Z23 is turned off in step S26, the cooling control mechanism unit 20 installed on the outer wall surface of the measurement zone Z23 is controlled to be turned on. Proceed to step S28.

  By operating the cooling control mechanism unit 20 installed on the outer wall surface of the measurement zone Z23, the outer wall surface of the measurement zone Z23 is blown with compressed air for cooling control, and a set temperature to (for example, 150) of the molten resin temperature is controlled. The amount of heat corresponding to the rise in temperature that has exceeded (° C.) is suppressed from cooling, and the molten resin temperature is lowered to the set temperature to.

  In step S28, it is determined whether or not the molten resin temperature ta in the compression zone Z22 or the measurement zone Z23 has been lowered to a set temperature to (for example, 150 ° C.) by the cooling control by the cooling control mechanism unit 20. When it determines with YES, it progresses to the following step S29, controls the cooling control mechanism part 20 installed in the outer wall surface of the measurement zone Z23 to OFF, returns to step S21, and operation | movement is repeated.

  If NO is determined, the process returns to step S27, the cooling control mechanism 20 installed on the outer wall surface of the measurement zone Z23 is controlled to be turned ON, and the cooling operation is repeated.

  Note that the viscosity of the molten resin is lowered due to the temperature rise caused by the shear heat of the molten resin generated by the rotation of the injection screw 3 in the cylinder 2, but this rate of decrease is relatively low, and it is reduced during induction and grinding. For resin materials that do not cause troubles such as sticking, it is not necessary to operate the cooling control mechanism unit 20, so the various resin materials that are supplied are selected by the calculation unit 28 to correspond to various resin materials. Thus, the cooling control mechanism unit 20 can be operated or deactivated and used together.

  As described above, in the pellet recycling apparatus 1 that recycles the resin material made of the waste plastic material, the heater 6a installed on the outer wall surface of the measurement zone Z23 is OFF-controlled to face the outer wall surface of the measurement zone Z23. The cooling control mechanism unit 20 mounted on is operated via the calculation unit 28, and the outer wall surface temperature of the measurement zone Z23 is lower than a predetermined temperature (for example, 200 ° C.) to a set temperature (for example, 150 ° C.) of the molten resin. By controlling the cooling to the temperature T21, the amount of heat corresponding to the rising temperature of the molten resin due to the shearing heat generated during the kneading by the rotation of the injection screw in the compression zone Z22 or the like is suppressed by cooling within the lead time t21, and the increased molten resin Is lowered to the set temperature. Accordingly, by lowering the injected molten resin to the set temperature, when the molten resin is guided to the cutter unit 9 through the duct 8 of the pellet liner 7, the resin is moved to the inner wall of the duct 8 due to a decrease in viscosity accompanying the temperature increase of the molten resin. There is no trouble such as sticking, and a viscosity that facilitates grinding can be obtained without causing trouble such as sticking to the cutter part 9 when the molten resin is crushed by the cutter part 9.

  Next, the cooling control mechanism 30 of the pellet regenerating apparatus 1 according to the second embodiment of the present invention will be described with reference to FIGS. 1 and 4.

  FIG. 4 is an external explanatory view showing a cooling control mechanism part of a pellet recycling apparatus according to the second embodiment of the present invention. In addition, since the structural block of the cooling control mechanism part according to the second embodiment is substantially the same as that according to the first embodiment, refer to FIG. Description is omitted except for one part.

  The cooling control mechanism 30 of the pellet regenerating apparatus 1 according to the second embodiment of the present invention, as shown in FIG. 4, is a compression used as a cooling control means for the one according to the first embodiment. Instead of air, cooling water (or refrigerant) is used, and instead of the cooling control mechanism unit 20, the cooling control mechanism unit 30 is mounted on the outer wall surface of a predetermined portion (for example, the measurement zone Z33) of the cylinder 2, Even when shear heat is generated during compression kneading of the molten resin in the compression zone 32 or the like, the cooling control mechanism unit 30 attached to the measurement zone Z33 generates a heat amount corresponding to the rising temperature of the molten resin due to the generated shear heat. Cooling is suppressed, and the temperature of the molten resin injected from the cylinder 2 easily guides the molten resin to the cutter unit 9 so that a viscosity at which the molten resin can be easily crushed in the cutter unit 9 is obtained. (For example, 150 ° C) In which cooled controlled so that.

  As in the case of the first embodiment, the pellet recycling apparatus 1 according to the second embodiment of the present invention, for example, as shown in FIG. A hopper 10 equipped with a feeder (not shown), a cylinder 2 for kneading and melting resin fragments comprising an injection screw 3, an injection nozzle part 4, an injection screw 3, an injection nozzle part 4, heaters 6a, 6b, 6c, etc. The injection control unit 5 that rotates the injection screw 3, the pellet liner 7 having the duct 8 that guides the molten resin to the cutter unit 9, the cutter unit 9 that crushes the molten resin into pellets, and the cylinder 2 are injected. A cooling control mechanism 30 or the like for cooling the molten resin to a set temperature is used.

  In the pellet recycling apparatus 1, the cooling control mechanism 30 is mounted on the outer wall surface of a predetermined portion of the cylinder Z32 (for example, the measurement zone Z33), and shear heat is generated when the molten resin is compressed and kneaded in the compression zone 32 or the like. Even if it occurs, the amount of heat corresponding to the temperature rise of the molten resin due to the generated shear heat is suppressed, and the temperature of the molten resin injected from the cylinder 2 easily guides the molten resin to the cutter unit 9, Cooling control is performed so as to obtain a preset temperature (for example, 150 ° C.) at which a viscosity that facilitates pulverization of the molten resin in the cutter unit 9 is obtained.

  The cylinder 2 measures the amount of the molten resin material to be kneaded and melted, and the supply zone (referred to as Z31) for supplying the resin material, the compression zone for kneading and melting the resin material (referred to as Z32), as in the conventional case. The heaters 6c, 6b, 6a and outer wall temperature sensors 37c, 37b, 37a are mounted on the outer wall surfaces of the zones, respectively, and the compression zone Z32 and the measurement zone Z33. Molten resin temperature sensors 36b and 36a for detecting the temperature of the molten resin are mounted on the outer wall surface, respectively, and have a function of kneading and melting resin fragments including the injection screw 3, the injection nozzle portion 4, and the like.

  The cooling control mechanism unit 30 includes, for example, a supply pipe 34 that supplies cooling water, an open / close valve 35 that opens and closes a cooling water supply port attached to the supply pipe 34, and a cylinder 2 that is attached to the supply pipe 34. A cooling pipe 32 mounted so as to be wound around the outer wall surface of a predetermined portion (for example, the measurement zone Z33) a plurality of times, an electromagnetic valve 31 disposed at a connection portion between the supply pipe 34 and the cooling pipe 32, and the cooling pipe 32 A drain pipe 39 for draining the cooling water that has flowed into the cylinder, molten resin temperature sensors 36b and 36a for detecting the temperature of the molten resin installed on the outer wall surfaces of the compression zone Z32 and the measurement zone Z33 of the cylinder 2, and the cylinder 2 Molten tree detected from each outer wall temperature sensor 37c, 37b, 37a installed on the outer wall surface of each zone and each molten resin temperature sensor 36a, 36b On the basis of the detected temperature, the heater heating control is turned off, the calculation unit 28 (according to FIG. 1 (b)) that calculates the cooling water control inflow amount and the like, and the control signal from the calculation unit 28 determines the inflow amount of the cooling water. A cooling water inflow amount control unit (not shown) to be controlled, a cylinder heating control unit 11 for controlling the heat amounts of the heaters 6a, 6b, and 6c by a control signal from the calculation unit 28, and the like.

  Compared to the first embodiment, the calculation unit 28 is a unit in which the compressed air flow rate comparison / determination unit is switched to the cooling water inflow amount comparison / determination unit. By switching to the control unit (not shown), the temperature of the molten resin in the compression zone Z32 and the measurement zone Z33 of the cylinder 2 is set to a set temperature (a temperature within a range where no trouble due to sticking or the like occurs due to a decrease in viscosity of the molten resin For example, the cooling control calculation processing is performed so as not to exceed 150 ° C.).

  The calculation unit 28 performs heating control calculation processing so that the outer wall surface temperature of each zone of the cylinder 2 becomes a predetermined temperature (for example, 200 ° C.), and the molten resin temperatures of the compression zone Z32 and the measurement zone Z33 of the cylinder 2 are set. Cooling control calculation processing is performed so as not to exceed a set temperature (for example, 150 ° C.).

  In the heating control calculation processing for the outer wall surface of each zone, the outer wall surface temperature detection value of each zone of the cylinder 2 detected by each outer wall temperature sensor 37a, 37b, 37c is set to each predetermined temperature (for example, 200 ° C.). ) And a process of controlling the heating by the heaters 6a, 6b, and 6c through the heater heating control unit 11 so that the outer wall surface temperature of each zone becomes a predetermined temperature.

  In the cooling control process, the molten tree temperature detection values detected by the molten resin temperature sensors 36a and 36b installed in the compression zone Z32 and the measurement zone Z33 of the cylinder 2 are set to preset temperature settings (for example, 150 ° C.), and by this comparison determination, it is determined that each detected temperature exceeds each set temperature (for example, 150 ° C.) due to a temperature rise associated with shear heat generated when the resin material is kneaded and melted. In this process, a cooling water inflow amount or the like necessary for cooling the amount of heat corresponding to the rising temperature of the molten resin is calculated, and cooling control is performed. That is, the heating control by the heater 6a provided on the outer wall surface of the measurement zone Z33 of the cylinder 2 is switched to the stopped state, and the calculated cooling water inflow amount signal is sent via a cooling water inflow amount control unit (not shown). The calculated amount of cooling water inflow that is transmitted to the electromagnetic valve 31 connected to the cooling pipe 32 mounted so as to be wound around the outer wall surface of the measurement zone Z33 is a predetermined part of the cylinder 2 (for example, the measurement zone Z23). The amount of heat corresponding to the rising temperature of the molten resin is suppressed by cooling into the cooling pipe 32 mounted so as to be wound around the outer wall surface. The cooling water is sent to the electromagnetic valve 31 through the pipe 34 from the direction of the arrow F31 by opening the opening / closing valve 35 which is a cooling water supply port.

  Thereby, the outer wall surface of the predetermined part (for example, measurement zone Z33) of the cylinder 2 is cooled, and the temperature of the molten resin injected from the injection nozzle unit 4 is controlled to be cooled to a set temperature (for example, 150 ° C.). become.

  In addition, when the generation of shear heat of the molten resin occurs in the vicinity of the intermediate process of the compression zone Z32, the heater 6b installed on the outer wall surface of the compression zone Z32 is also turned off, and the outer wall surface of the compression zone Z32 is also turned off. The cooling control mechanism 30 is mounted to cool the outer wall surface of the compression zone Z32, and the amount of heat corresponding to the temperature rise of the molten resin is suppressed by cooling. Thereby, the amount of heat corresponding to the temperature rise of the molten resin is reliably suppressed by the cooling control mechanism 30 mounted in the compression zone Z32 and the measurement zone Z33 within the lead time, and the temperature of the molten resin is set to the set temperature. It will be lowered to t20.

  Note that the cooling water or the refrigerant, which is the cooling means used in the cooling control mechanism unit 30 according to the second embodiment, is the pellets regenerated by the pellet regeneration apparatus according to the second embodiment. Can be supplied and supplied to a mold temperature controller (not shown) of an injection apparatus installed for injection molding. The inflow supply to the mold temperature controller (direction F32 shown in FIG. 4) is an open / close valve 38 that opens and closes the cooling water supply port to the mold temperature controller mounted near the end of the supply pipe 34. Controlled and done through piping.

  The cooling water poured into the cooling pipe 33 is heated to lower the temperature of the outer wall surface of the measurement zone Z33 of the cylinder 2 (the amount of heat corresponding to the rising temperature of the molten resin material) by heat conduction. Drain in the direction of F33.

  In addition, when this pellet recycling apparatus 1 and an injection apparatus (not shown) for injection-molding pellets are installed and operated on the same floor or the like, cooling water as cooling means used in the cooling control mechanism unit 30 is used. It can be supplied in the F32 direction via the opening / closing valve 38 and used together.

  Note that the viscosity of the molten resin is lowered due to the temperature rise caused by the shear heat of the molten resin generated by the rotation of the injection screw 3 in the cylinder 2, but this rate of decrease is relatively low, and it is reduced during induction and grinding. For resin materials that do not cause trouble such as sticking, it is not necessary to operate the cooling control mechanism unit 30. Therefore, the various resin materials to be supplied are selected by the calculation unit 28 to cope with various resin materials. Thus, the cooling control mechanism 30 can be operated or not operated and used together.

  As described above, since the cooling control mechanism unit using cooling water (or refrigerant) is used instead of the cooling control mechanism unit using compressed air in the first embodiment, the first embodiment In addition to the effects obtained by the pellet recycling apparatus according to the embodiment, a relatively large cooling capacity can be obtained, and the time constant for cooling control can be reduced.

  Next, the cooling control mechanism 40 of the pellet regenerating apparatus 1 according to the third embodiment of the present invention will be described with reference to FIG.

  FIG. 5 is an external explanatory view showing a cooling control mechanism part of a pellet recycling apparatus according to the third embodiment of the present invention. The configuration block of the cooling control mechanism unit according to the third embodiment is substantially the same as that according to the first embodiment, so refer to FIG. Description is omitted except for one part.

  As shown in FIG. 5, the cooling control mechanism 40 of the pellet regenerating apparatus 1 according to the third embodiment of the present invention is the one according to the first embodiment (using compressed air on the outer wall surface of the cylinder 2). The temperature of the molten resin injected from the cylinder 2 is controlled so that the temperature of the molten resin is set to the set temperature), and the cooling of the molten resin injected from the cylinder 2 is directly controlled for cooling. is there.

  For example, as shown in FIG. 5, the pellet recycling apparatus 1 according to the third embodiment of the present invention includes a cylinder 2 that kneads and melts resin fragments including an injection screw 3, an injection nozzle portion 4, a heater 6, and the like. A pellet liner 7 having an induction receiving plate 46 for guiding the molten resin to the pellet liner 7, a duct 8 for guiding the molten resin from the induction receiving plate 46 to the cutter unit 9, a cutter unit 9 for pulverizing the molten resin into pellets, A cooling control mechanism 40 for cooling the molten resin injected from the cylinder 2 to a set temperature, a first temperature sensor 45 for detecting the temperature in the vicinity of the injection port injected from the injection nozzle 4 of the molten resin, and the injected molten A second temperature sensor 47 that detects the temperature of the molten resin after being cooled by the resin cooling control mechanism 40 is formed.

  The pellet recycling apparatus 1 regenerates a resin material made of a waste plastic material such as a defective plastic product or waste, and again produces pellets as a raw material for the synthetic resin product, and is injected from the cylinder 2. The cooling control mechanism 40 is arranged in the vicinity of the tip of the cylinder 2 so that the molten resin is easily guided to the cutter unit 9 and is adjusted and controlled to a set temperature at which the viscosity at which the molten resin can be easily crushed in the cutter unit 9 is obtained. It was established.

  The cooling control mechanism 40 differs depending on the type of resin material made of waste plastic material to be supplied, but when the resin material is kneaded and melted and moved by the rotation of the injection screw 3, shearing heat is generated, and the injection nozzle portion Although the temperature of the molten resin injected from 4 rises, this increased molten resin (injected from the injection nozzle unit 4) is directly cooled with ultra-low temperature air, and is set at a preset temperature (for example, 150 ° C.). Cooling control is performed so as to suppress the rising temperature exceeding.

  In the cylinder 2 used in the pellet recycling apparatus 1 according to the first embodiment, the outer peripheral wall of the cylinder 2 is cooled by cooling means such as compressed air, and the molten resin is controlled to be cooled. In the third embodiment, the outer peripheral wall portion of the cylinder 2 is not cooled, but the molten resin injected from the injection nozzle portion 4 (the one whose temperature exceeds the set temperature) is directly used. Therefore, cooling control is performed so as to keep the temperature within the set temperature.

  The cylinder 2 is provided with a first temperature sensor 45 that detects the temperature of the molten resin in the vicinity of the injection nozzle portion 4 and rises above the set temperature due to shear heat generated by the rotation of the injection screw before being injected. The temperature of the molten resin is detected. A second temperature sensor 47 is mounted on the side of the pellet liner 7 of the induction receiving plate 46 that guides the molten resin connected to the tip of the injection nozzle portion 4 of the cylinder 2, and the set temperature of the molten resin is set. Detect the temperature after cooling the excess temperature rise. The detected temperatures before and after cooling of the molten resin detected from the temperature sensors 46 and 47 are fed back to the calculation unit 28 (according to FIG. 1B), and the cooling control mechanism is based on the amount of heat corresponding to the difference between the detected temperatures. The flow rate of the ultra low temperature air injected from the ultra low temperature air generator 41 provided in the unit 40 is calculated.

  For example, it is assumed that the temperature detected by the first temperature sensor 45 (referred to as t1) is obtained by adding a rise in temperature (referred to as δt1) exceeding the set temperature (referred to as T1) of the molten resin, and the second temperature sensor. The temperature detected at 47 (referred to as t2) is the temperature rise after the rise in the molten resin (referred to as δt1) (referred to as δt2 and cooled so that δt2 becomes zero). This value is equivalent to a value obtained by subtracting the temperature t2 detected by the second temperature sensor 47 from the temperature t1 detected by the first temperature sensor 45 (this value is controlled to become the set temperature T1). The flow rate of the ultra-low temperature air necessary for cooling the amount of heat to be calculated is calculated. That is, t1−t2 = (T1 + δt1) − (T1 + δt2) is set to zero, and the flow rate of the ultra-low temperature air is calculated so that the temperature t2 detected by the second temperature sensor 47 becomes the set temperature T1 of the molten resin. Cooling adjustment control is performed so that the calculated flow rate of the ultra-low temperature air is directly blown onto the molten resin injected from the injection nozzle unit 4 so that the temperature of the molten resin becomes the set temperature.

  The cooling control mechanism unit 40 is, for example, a pipe 43 that supplies compressed air, an open / close valve 44 that opens and closes a compressed air supply port attached to the pipe 43, and a heat dissipation unit that injects low-temperature air attached to the pipe 43. From the ultra-low temperature air generator 41 having the nozzle 42, the induction receiving plate 46 for guiding the molten resin connected to the tip of the injection nozzle portion 4 of the cylinder 2, and the injection nozzle portion 4 attached to the cylinder 2 Detected from the first temperature sensor 45 that detects the temperature of the molten resin before being injected, the second temperature sensor 47 that detects the temperature of the cooled molten resin mounted on the induction receiving plate 46, and each temperature sensor. And a low-temperature air blowing flow rate control unit that controls the blowing flow rate of the ultra-low temperature air by a control signal from the calculation unit 28 (see FIG. 1B). ( And a cylinder temperature control unit 11 for controlling the amount of heat of the heater 6 attached to the cylinder 2 by a control signal from the calculation unit 28.

  The calculation unit 28 is the one used in the pellet regeneration apparatus 1 according to the first embodiment, wherein the compressed air flow rate comparison / determination unit is switched to the ultra-low temperature air blowing flow rate comparison / determination unit. Is switched to a super low temperature air spray flow rate control unit (not shown), and the detected temperature of the molten resin in the vicinity of the injection nozzle 4 detected by the first temperature sensor 45 and the super low temperature air spray detected by the second temperature sensor 47 are switched. The detected temperature of the molten resin cooled in step 1 is compared with each preset temperature set in advance. Then, the temperature detected by the second temperature sensor 47 is detected from the temperature of the molten resin near the injection nozzle portion 4 detected by the first temperature sensor 45 so that the temperature detected by the second temperature sensor 47 becomes a preset temperature. The temperature obtained by subtracting the temperature of the molten resin after cooling, that is, the flow rate of the ultra-low-temperature air necessary for cooling the rising temperature of the molten resin is calculated and controlled.

  The ultra-low temperature air generator 41, for example, generates high-speed overflow by using a special generator to separate the supplied compressed air into cold air and hot air using the internal pressure difference. It is attached to the supply pipe 43 in a state in which an exhaust nozzle 48 for discharging hot air 42 and hot air is provided.

  The ultra-low temperature air generator 41 receives the low-temperature air blowing flow rate calculated by the calculation unit 28 as a control signal from a blowing flow rate control unit (not shown), and receives the low-temperature air blowing flow rate from the cooling nozzle 42. Is directly sprayed on the molten resin on the induction receiving plate 46, and the rising temperature exceeding the set temperature of the molten resin due to the shearing heat of the molten resin generated when the resin material is kneaded and melted in the cylinder 2 is cooled to the set temperature. Thus, cooling control is performed.

  The temperature rise due to the shearing heat of the molten resin generated by the rotation of the injection screw 3 and the rate of decrease in the viscosity of the molten resin due to the temperature rise are different depending on the type of resin material to be supplied. For resin materials that rapidly decrease, such as biodegradable plastics, further cooling treatment is required. Therefore, the cooling capacity is calculated and the cooling flow rate is set in accordance with the type of resin material.

  Next, regarding the cooling processing method of the cooling control unit 40 of the pellet regenerating apparatus 1, the temperature of the molten resin is cooled by cooling the outer wall of the cylinder 2 with compressed air, as in the first embodiment. Instead, since the low-temperature air is directly blown onto the molten resin injected from the cylinder 2 for cooling control, this different cooling method will be described.

  In the cooling control method using low-temperature air, for example, compressed air is supplied and controlled in the direction of F41 from the supply port by opening and closing the open / close valve 44, and ultra-low temperature air including a cooling nozzle 42 and an exhaust pipe 48 attached to the supply pipe 43 is provided. It is supplied to the generator 41. The compressed air supplied to the ultra-low temperature air generator 41 is separated into ultra-low temperature air and hot air by the ultra-low temperature air generator 41, and the blowing flow amount of the ultra-low temperature air calculated by the calculation unit 28 is guided from the cooling nozzle 42 to the induction receiving plate. Cooling is controlled such that the molten resin is sprayed directly in the direction of F42 toward the injected molten resin on 46, and the temperature of the molten resin becomes a set value. Then, the hot air is exhausted from the exhaust pipe 48 in the F43 direction.

  In addition, although the cooling means by compressed air etc. is not arrange | positioned at the outer wall surface of the cylinder 2 of the pellet reproduction | regeneration apparatus 1 which concerns on this 3rd Embodiment, without sticking to this, the 1st or 2nd The cooling means to which the cooling control mechanism 20 (or 30) according to the embodiment is applied can be used in combination. By providing the cooling control mechanism 20 (or 30) in combination, the cooling control becomes more reliable and effective, and each cooling capacity can be halved.

  Note that the viscosity of the molten resin is lowered due to the temperature rise caused by the shear heat of the molten resin generated by the rotation of the injection screw 3 in the cylinder 2, but this rate of decrease is relatively low, and it is reduced during induction and grinding. For resin materials that do not cause troubles such as sticking, it is not necessary to operate the cooling control mechanism unit 40, so the various resin materials supplied are selected by the calculation unit 28 to correspond to various resin materials. Thus, the cooling control mechanism 40 can be operated or deactivated and used together.

  As described above, in the pellet recycling apparatus 1 for recycling pelletized resin material made of waste plastic material, the cooling control mechanism 40 is provided near the tip of the cylinder 2 for kneading and melting the resin material, and the injection screw 3 rotates. The molten resin injected from the injection nozzle part 4 whose temperature has exceeded the set temperature by the shearing heat generated during kneading is directly cooled to suppress the temperature increase, and cooling control is performed so as to maintain the set temperature.

  When the molten resin is guided to the cutter unit 9 through the duct 8 of the pellet liner 7 by this cooling control, troubles such as sticking to the inner wall of the duct 8 caused by a decrease in viscosity accompanying a temperature increase of the molten resin are involved. In addition, even when the molten resin is pulverized by the cutter unit, the temperature can be adjusted and controlled so as to obtain a viscosity that facilitates pulverization without causing trouble such as sticking to the cutter unit. And by the direct cooling to the molten resin by the cooling control mechanism 40, the temperature of the molten resin that has risen can be cooled in a short time, and the structure can be made relatively simple.

  Next, the 1st guidance mechanism part 50 of the pellet reproduction | regeneration apparatus 1 which concerns on the 4th Embodiment of this invention is demonstrated with reference to FIG.

  FIG. 6 is an external appearance explanatory view showing a first guiding mechanism part of a pellet recycling apparatus according to the fourth embodiment of the present invention.

  The pellet recycling apparatus 1 according to the fourth embodiment of the present invention includes, as shown in FIG. 6, for example, a cylinder 2 for kneading and melting resin fragments including an injection screw 3 and an injection nozzle portion 4 and the like, and a molten resin. The cutter unit 9 is pulverized into pellets, and the first induction mechanism unit 50 is provided with a guidance mechanism that guides molten resin to the cutter unit 9 by the flow of compressed air.

  The pellet recycling apparatus 1 regenerates a resin material made of a waste plastic material such as a defective plastic product or waste, and again produces pellets as a raw material for the synthetic resin product. The first guiding mechanism 50 is provided without using a pellet liner so that the molten resin can be easily guided to the cutter unit 9. And this 1st induction | guidance | derivation mechanism part 50 changes with kinds of the resin material which is the waste plastic material supplied, but when the resin material is kneaded and melted and moved by rotation of the injection screw 3, shear heat is generated, As the temperature of the molten resin injected from the injection nozzle portion 4 rises, the viscosity of the molten resin decreases, and troubles due to burrs on the inner walls of ducts and the like generated when the molten resin is guided to the cutter portion 9 are caused. In order to prevent this, the molten resin is guided and moved in the space using compressed air.

  The temperature rise due to the shearing heat of the molten resin generated by the rotation of the injection screw 3 and the rate of decrease in the viscosity of the molten resin due to the temperature rise are different depending on the type of resin material to be supplied. For resin materials that rapidly decline, such as biodegradable plastics, guide plates such as pellet liners are not provided, so there is no trouble such as sticking to the inner wall by the pellet liner, and guided movement in the space. Will be more effective. Since the compressed air is directly blown onto the molten resin to change the direction for induction movement, the effect of cooling the molten resin whose temperature has increased can also be obtained.

  For example, the first guide mechanism unit 50 injects compressed air attached to the pipe 53, a pipe 53 that supplies compressed air, an open / close valve 54 that opens and closes a compressed air supply port attached to the pipe 53, and A compressed air supply controller 51 having a guiding nozzle 52 for guiding the molten resin to the cutter unit 9; a receiving plate 56 for taking in the molten resin connected to the tip of the injection nozzle unit 4 of the cylinder 2; Consists of a cutter unit 9 that pulverizes resin into pellets, and an arithmetic unit 28 (according to FIG. 1 (b)) that computes the flow rate of compressed air necessary to guide molten resin to the cutter unit 9. Has been.

  The calculation unit 28 is a compressed air induction flow rate control unit (not shown) that controls the compressed air flow rate control unit 29 of the one used in the pellet recycling apparatus 1 according to the first embodiment to the cutter unit 9 with molten resin. The compressed air induction flow rate sprayed from the guide nozzle 52 toward the molten resin is calculated and controlled so as to be a flow rate that can guide the molten resin to a predetermined position of the cutter unit 9. Omitted.

  The compressed air supply controller 51 receives, as a control signal from the compressed air induction flow rate control unit (not shown), the compressed air induced flow rate calculated by the calculation unit 28, and this compressed air induced spray flow rate. Is directly sprayed from the guide nozzle 52 toward the molten resin injected from the injection nozzle portion 4 of the cylinder 2 from the upper direction, and the molten resin is applied to the predetermined position of the cutter portion 9 in the space without using a pellet liner. It is controlled so as to be guided and moved.

  Next, with regard to the method of guiding and moving the molten resin by the first guide mechanism unit 50 of the pellet recycling apparatus 1, for example, compressed air is supplied from the supply port to the F51 direction by opening and closing the open / close valve 54 and attached to the supply pipe 53. The compressed air supply controller 51 having the guiding nozzle 52 is supplied. In the compressed air supply controller 51, the amount of the compressed air guided blowing flow calculated by the calculation unit 28 is directly blown from the top toward the F52 direction toward the molten resin injected from the injection nozzle unit 4 from the induction nozzle 52. The molten resin is controlled to be guided and moved in the space without using a pellet liner at a predetermined position of the cutter unit 9.

  In addition, it replaces with the guidance means which guides and moves molten resin using the compressed air by the 1st guidance mechanism part 50 of the pellet reproduction | regeneration apparatus 1 which concerns on the 4th Embodiment of this invention, and concerns on other embodiment. There is a guiding means for guiding and moving the molten resin using a vacuum by the second guiding mechanism unit 60 of the pellet recycling apparatus 1.

  Next, the 2nd guidance mechanism part 60 of the pellet reproduction | regeneration apparatus 1 which concerns on other embodiment is demonstrated with reference to FIG.

  FIG. 7 is an external explanatory view showing a second guiding mechanism part of a pellet recycling apparatus according to another embodiment according to the fourth embodiment of the present invention.

  As shown in FIG. 7, for example, as shown in FIG. 7, the second induction mechanism unit 60 of the pellet recycling apparatus 1 according to the fourth embodiment of the fourth embodiment of the present invention includes a cylinder 2 for kneading and melting resin fragments, The cutter unit 9 pulverizes the resin to form pellets, the second induction mechanism unit 60 including a vacuum induction mechanism that guides the molten resin to the cutter unit 9, and the like.

  The second induction mechanism 60 differs depending on the type of resin material made of waste plastic material to be supplied, but when the resin material is kneaded and melted and moved by the rotation of the injection screw 3, shear heat is generated and the injection nozzle As the temperature of the molten resin injected from the portion 4 rises, the viscosity of the molten resin decreases, and troubles caused by sticking to the inner wall of a duct or the like generated when the molten resin is guided to the cutter portion 9 are prevented. Therefore, the molten resin is guided and moved in the space using the suction air by the vacuum.

  The second induction mechanism 60 includes, for example, a vacuum device that includes a suction first piping 62 that guides the molten resin to the cutter unit 9 and a second piping 63 that discharges air using suction air generated by vacuum. 61, a receiving plate 64 that takes in the molten resin connected to the tip of the injection nozzle 4 of the cylinder 2, a cutter 9 that crushes the molten resin into pellets, and guides the molten resin to the cutter 9 For example, it is composed of a calculation unit 28 (according to FIG. 1B) for calculating the flow rate of the intake air necessary for this.

  The calculation unit 28 is obtained by switching a compressed air induction flow rate control unit (not shown) to a suction air induction flow rate control unit (not shown) with respect to the first induction mechanism unit 50, and the suction air induction flow rate is a molten resin. Since the calculation is controlled so that the flow rate can be guided to a predetermined position of the cutter unit 9, detailed description thereof will be omitted.

  The vacuum device 61 receives the intake air induced flow rate calculated by the calculation unit 28 as a control signal from a compressed air induced flow rate control unit (not shown), and sucks the intake air induced flow rate into the first piping unit. 62, sucked in the F61 direction from the upper direction toward the lower direction, and the molten resin (injected from the injection nozzle portion 4 of the cylinder 2) can be formed in the space without using a pellet liner at a predetermined position of the cutter portion 9. It is controlled so as to be guided and moved. At this time, the sucked air is discharged from the second piping part 63 in the F62 direction.

  In addition, the 1st induction | guidance | derivation mechanism part 50 (or 2nd induction | guidance | derivation mechanism part 60) of the pellet reproduction | regeneration apparatus 1 which concerns on this 4th Embodiment is used together with what concerns on the 1st or 2nd embodiment. Can be applied.

  As described above, in the pellet recycling apparatus 1 that recycles the resin material made of the waste plastic material, the first guide mechanism unit 50 (or the second guide mechanism unit) is provided near the tip of the cylinder 2 that kneads and melts the resin material. 60), and the molten resin injected from the injection nozzle part 4 whose temperature has been raised by shearing heat generated during the kneading by the rotation of the injection screw is guided in the space without using a pellet liner at a predetermined position of the cutter part 9. By controlling so as to move, adjustment control can be easily performed without causing troubles such as sticking to the inner wall of the duct 8 caused by a decrease in viscosity accompanying a rise in temperature of the molten resin. Since the structure is relatively simple without using a pellet liner or the like, the cost can be reduced. Also, as shown in FIG. 6, the heat of the molten resin is agitated by spraying with compressed air or sucking with vacuum as shown in FIG. 7, so that the temperature rise of the molten resin can be suppressed. it can.

  Next, the cylinder rotation moving mechanism part 70 of the pellet reproduction apparatus 1 according to the fifth embodiment of the present invention will be described with reference to FIG.

  FIG. 8 is an external explanatory view showing a cylinder rotation moving mechanism part of a pellet recycling apparatus according to the fifth embodiment of the present invention.

  The pellet recycling apparatus 1 according to the fifth embodiment of the present invention includes, as shown in FIG. 8, for example, a cylinder 2 that kneads and melts resin fragments including an injection screw 3 and an injection nozzle unit 4 and the like, and a molten resin. The cutter unit 9 is pulverized into pellets, and the cylinder rotational movement mechanism unit 70 is provided with a drive mechanism that rotationally moves the cylinder 2 itself to guide the molten resin to the cutter unit 9.

  The pellet recycling apparatus 1 regenerates a resin material made of a waste plastic material such as a defective plastic product or waste, and again produces pellets as a raw material for the synthetic resin product. A cylinder rotational movement mechanism unit 70 is provided to allow molten resin to be easily guided and moved to the cutter unit 9.

  The cylinder rotational movement mechanism 70 varies depending on the type of resin material made of waste plastic material to be supplied, but shearing heat is generated when the resin material is moved while being kneaded and melted by the rotation of the injection screw 3. When the temperature of the molten resin injected from the injection nozzle part 4 rises, the viscosity of the molten resin decreases, and when the molten resin is guided to the cutter part 9, the molten resin sticks to the inner wall of the duct or the like This is provided to prevent the occurrence of the above. In particular, for resin materials whose viscosity greatly decreases due to temperature rise, such as biodegradable plastics, when the molten resin is guided to the cutter unit 9, the sticking to the inner wall of the pellet liner 7 and the like becomes large, which causes trouble. Since the occurrence frequently occurs, without using the pellet liner 7 or the like, the rotational movement mechanism unit 70 is used to rotate and move in the inverted direction so that the axis of the cylinder 2 coincides with the axis of the cutter unit 9, The molten resin is directly injected into the cutter unit 9.

  Note that the cylinder rotational movement mechanism unit 70 may not be used for a resin material or the like whose viscosity does not decrease much even when the temperature of the molten resin rises. Accordingly, in order to switch the operation of the cylinder rotational movement mechanism unit 70 in accordance with the type of resin material supplied, the type of resin material can be selected by the calculation unit 28 (according to FIG. 1B). It is set.

  The cylinder rotation movement mechanism unit 70 is, for example, a gantry 2 on which the cylinder 2 is installed, a rotation mechanism unit 71 for rotating the cylinder 2 installed on the gantry 2 in an inverted direction, and crushing molten resin into a pellet And a calculation unit 28 (based on FIG. 1B) that controls the rotational movement of the molten resin to the cutter unit 9 and the like.

  The calculation unit 28 switches the compressed air flow rate control unit 29 used in the pellet recycling apparatus 1 according to the first embodiment to a rotation control unit (not shown) of the cylinder 2 to correspond to the type of resin material. Since the drive operation of the rotation mechanism 71 is subjected to selection control processing, detailed description is omitted.

  The rotation mechanism unit 71 receives a control signal corresponding to the type of resin material from the calculation unit 28, and in the case where the supplied resin is a resin material having a large decrease in the viscosity coefficient due to a temperature rise, for example, a biodegradable plastic, The axial center C71 of the cylinder 2 is rotated in the inverted direction so as to coincide with the axial center C72 of the cutter unit 9, and the molten resin is directly injected into the cutter unit 9 and guided by its own weight. The rotation mechanism unit 71 is installed on the pedestal 72 where the cylinder 2 is installed. When the supplied resin is a resin material that greatly reduces the viscosity due to a temperature increase, the rotation mechanism unit 71 is driven and operated. In the normal case where the viscosity is not changed so much, it is used in combination with the type of resin material so as not to drive.

  Next, regarding the method of rotational movement of the cylinder 2 by the cylinder rotational movement mechanism unit 70 of the pellet recycling apparatus 1, for example, in the case where the supplied resin is a resin material that greatly reduces the viscosity due to temperature rise, the calculation unit 28 A rotation control signal is transmitted to the rotation mechanism unit 71, and the rotation mechanism unit 71 that has received the rotation control signal causes the cylinder 2 to move in an inverted direction so that the axis C71 of the cylinder 2 coincides with the axis C72 of the cutter unit 9. The rotational movement is controlled, and the molten resin is directly injected into the cutter unit 9 and guided by its own weight. This rotational movement is performed by rotating the cylinder 2 in the R71 direction with the rotation center position P71 of the rotation mechanism 71 installed on the pedestal 72 as a fulcrum. At this time, the hopper 10 for taking in the resin fragments to be supplied is set to change the position of the resin fragment supply port and the like according to the rotational movement of the cylinder 2, although not shown.

  As described above, in the pellet recycling apparatus 1 that recycles the resin material made of waste plastic material, the cylinder 2 is rotated in the inverted direction so that the axis C71 of the cylinder 2 coincides with the axis C72 of the cutter unit 9. A cylinder rotating / moving mechanism unit 70 is provided for moving the molten resin (for example, a material whose viscosity is suddenly lowered due to a rise in the temperature of the shearing heat generated when the resin material is kneaded) directly from the injection nozzle unit 4. By injecting to a predetermined position and guiding with its own weight, the molten resin is guided without causing trouble such as sticking of the molten resin to the inner wall of the pellet liner duct, etc., which occurs due to a decrease in the viscosity of the molten resin. Adjustment control can be easily performed. In molten resin with a small change in viscosity due to temperature rise, the driving operation of the cylinder rotational movement mechanism unit 70 is stopped, and a combined operation in which operation / non-operation can be selected according to the type of resin material is performed. Control is easy, and troubles due to a decrease in the viscosity of the molten resin can be accurately prevented. Further, by rotating the cylinder 2, the heat of the molten resin can be stirred, and the temperature rise of the molten resin can be suppressed.

It is a perspective view which shows the cooling control mechanism part of the pellet reproduction apparatus which concerns on the 1st Embodiment of this invention. It is explanatory drawing which shows an example of the resin control temperature in the pelletization of the resin material by the cylinder of the pellet reproduction apparatus which concerns on the 1st Embodiment of this invention. It is a cooling control flowchart of the cooling control mechanism part of the pellet reproduction | regeneration apparatus which concerns on the 1st Embodiment of this invention. It is external appearance explanatory drawing which shows the cooling control mechanism part of the pellet reproduction apparatus which concerns on the 2nd Embodiment of this invention. It is external appearance explanatory drawing which shows the cooling control mechanism part of the pellet reproduction apparatus which concerns on the 3rd Embodiment of this invention. It is external appearance explanatory drawing which shows the 1st guidance mechanism part of the pellet reproduction apparatus which concerns on the 4th Embodiment of this invention. It is external appearance explanatory drawing which shows the 2nd induction | guidance | derivation mechanism part of the pellet reproduction | regeneration apparatus which concerns on other embodiment which concerns on the 4th Embodiment of this invention. It is external appearance explanatory drawing which shows the cylinder rotational movement mechanism part of the pellet reproduction apparatus which concerns on the 5th Embodiment of this invention. It is explanatory drawing which shows an example regarding the rising temperature characteristic of the molten resin material by the shear heat generated at the time of the melt kneading | mixing of the resin material by the cylinder of the conventional pellet reproduction | regeneration apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Pellet reproduction apparatus 2 ... Cylinder 3 ... Injection screw 4 ... Injection nozzle part 5 ... Drive control part 6 ... Heater 7 ... Pellet liner 8 ... Duct 9 ..Cutter part 10 ... hopper 11 ... cylinder temperature control part 20, 30, 40 ... cooling control mechanism part 21 ... electromagnetic valve 22 ... spraying nozzle 24 ... piping 25 ... Opening / closing valve 26 ... Molten resin temperature sensor 27 ... Outer wall temperature sensor 28 ... Calculation unit 29 ... Compressed air flow rate control unit 31 ... Electromagnetic valve 32 ... Cooling pipe 34 ... Supply pipe 35, 38 ... Open / close valve 36 ... Molten resin temperature sensor 37 ... Outer wall temperature sensor 39 ... Drain pipe 41 ... Ultra-low temperature air generator 42 ... Radiation nozzle 43 ... Piping 44 ... Closed valve 45 ... first temperature sensor 46 ... induction receiving plate 47 ... second temperature sensor 48 ... exhaust pipe 50 ... first induction mechanism 51 ... compressed air supply controller 52 ... Guiding nozzle 53 ... Piping 54 ... Open / close valve 56 ... Receiving plate 60 ... Second guiding mechanism 61 ... Vacuum device 62 ... First piping 63 ...・ Second piping part 64 .. Receiving plate 70... Rotating and moving mechanism part 71... Rotating mechanism part 72.

Claims (3)

In a pellet recycling apparatus that includes a cylinder that melts and kneads a resin material, and that regenerates pellets from the molten resin material,
Resin temperature detection means for detecting the temperature of the resin material in the cylinder;
Cooling means for cooling the outer wall of the cylinder;
And a control means for operating the cooling means when the resin temperature detecting means detects a temperature rise due to shear heat generated during plasticization of the resin material. In a pellet recycling apparatus that includes a cylinder that melts and kneads a resin material, and regenerates the pellet by cutting the melted resin material at the cutter part,
2. A pellet recycling apparatus, comprising: a guiding means for guiding the resin material injected from the cylinder to the cutter portion by air flow. In a pellet recycling apparatus that includes a cylinder that melts and kneads a resin material, and regenerates the pellet by cutting the melted resin material at the cutter part,
A rotating means for rotating the cylinder in an inverted direction;
A pellet recycling apparatus, wherein the cylinder by the rotating means is inverted and the molten resin material injected from the cylinder is guided to the cutter part by its own weight.

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