Method for manufacturing waste plastic molded products, and apparatus for manufacturing waste plastic molded products

Abstract

To provide a novel and excellent production apparatus of a waste plastic molding and a production method of a waste plastic molding, capable of densifying the waste plastic molding and reducing a maintenance load with suppressed reduction in cooling efficiency of a nozzle.SOLUTION: A production method of a waste plastic molding includes a raw material feeding step of feeding a waste plastic raw material into a container, a kneading and heating step of kneading and heating the waste plastic raw material in the container, a transport step of transporting the waste plastic raw material heated to 140°C or more toward a nozzle disposed on a faceplate at an end of the container to communicate between the inside of the container and the outside, projecting from an end face of the faceplate on the outer side of the container, and a cooling step of cooling the nozzle to 100°C or less at least while the waste plastic material is extruded in the nozzle, by spraying a cooling medium to the outer peripheral surface of the nozzle area on the faceplate side, divided from the nozzle area on the opening side by a partition wall attached to the outer peripheral surface of the nozzle.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a waste plastic molded product and an apparatus for manufacturing a waste plastic molded product.

Background Art

[0002] In order to recycle waste plastics contained in household waste and the like, there is a technique of converting waste plastics into chemical raw materials using a coke oven. In order to introduce waste plastics into the coke oven, it is necessary to mold the waste plastics into a molded product having a predetermined shape.

[0003] For example, Patent Document 1 below discloses a technique in which extrusion molding is performed on a waste plastic raw material heated to a predetermined temperature or higher, and when manufacturing a waste plastic molded product, the communication part during extrusion molding is cooled to a temperature lower than the predetermined temperature. According to Patent Document 1, since the melted surface of the waste plastic raw material can be solidified, the expansion of the waste plastic molded product during extrusion or after being extruded from the nozzle of the communication part is suppressed, and high density is achieved.

[0004] Further, Patent Document 2 below discloses an extrusion molding machine having a nozzle having an extrusion port through which a molded product is extruded, a shielding plate provided at a position away from the extrusion port, and a blade provided between the extrusion port and the shielding plate. In the extrusion molding machine of Patent Document 2 below, a blade is disposed in front of the shielding plate in the extrusion direction of the molded product. Therefore, by cutting the molded product with the blade in a state where the extruded molded product hits the shielding plate, a molded product having a certain length corresponding to the distance between the blade and the shielding plate can be obtained.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

[0006] In this study, the inventors found that in the cases of Patent Document 1 and Patent Document 2, a portion of the waste plastic molded material may scatter during cutting, and some of the scattered waste plastic molded material may adhere to the surface of the nozzle. Furthermore, it was found that this makes it difficult for the nozzle temperature to decrease even with cooling, and as a result, there is a concern that the cooling efficiency of the nozzle will decrease. In this specification, the "surface of the nozzle" to which a portion of the waste plastic molded material adheres includes both the outer circumferential surface of the nozzle and the end surface on the opening side.

[0007] Typically, the heat transfer coefficient of a portion of the extruded waste plastic molded product is lower than that of the nozzle during extrusion. Therefore, if a portion of the waste plastic molded product adheres to the nozzle surface, the nozzle's cooling efficiency decreases compared to cases where no portion adheres. This reduced nozzle cooling efficiency prevents sufficient solidification of the molten surface of the waste plastic molded product extruded from the nozzle. In other words, a film is less likely to form on the outer surface (outer surface) of the waste plastic molded product. As a result, a problem arises where the density of the waste plastic molded product decreases.

[0008] In this regard, Patent Documents 1 and 2 do not consider at all how to prevent a portion of the waste plastic molded product from adhering to the nozzle surface. In particular, the shielding plate in Patent Document 2 is merely positioned for the purpose of obtaining a molded product of a certain length, and is not positioned between the nozzle and the cutting tool. For this reason, it is difficult to prevent a portion of the waste plastic molded product from adhering to the nozzle surface even with the shielding plate in Patent Document 2.

[0009] Furthermore, if the cooling efficiency of the nozzle decreases, maintenance to improve the cooling efficiency may be required, such as temporarily stopping the waste plastic molding equipment and performing cleaning to remove some of the molded material that has adhered to the nozzle surface. In addition, preparatory work such as removing the nozzle from the container may be required before the cleaning work. This also leads to the problem of increased maintenance burden.

[0010] The present invention has been made in view of the above problems, and the object of the present invention is to provide a novel and excellent waste plastic molded product manufacturing apparatus and a waste plastic molded product manufacturing method that can increase the density of waste plastic molded products and reduce the maintenance burden by suppressing a decrease in the cooling efficiency of the nozzle. [Means for solving the problem]

[0011] To solve the above problems, according to one aspect of the present invention, a method for manufacturing a waste plastic molded product is provided, which includes: a raw material input step of putting waste plastic raw material into a container; a kneading and heating step of kneading and heating the waste plastic raw material in the container; a transfer step of transferring the waste plastic raw material, heated to 140°C or higher, toward a nozzle provided on a faceplate at the end of the container, which communicates the inside and outside of the container and protrudes from the outer end face of the faceplate on the outside of the container; and a cooling step of cooling the nozzle to 100°C or lower, at least while the waste plastic raw material is pushed out of the nozzle, by spraying a coolant onto the outer surface of the portion of the nozzle on the faceplate side, which is separated from the portion of the nozzle on the opening side by a partition wall attached to the outer surface of the nozzle.

[0012] The system further includes a gas injection step in which gas is injected into the water vapor generated by the spraying of the above-mentioned refrigerant, wherein, when the faceplate is viewed from the front, the space between the faceplate and the partition wall is open to the atmosphere above, below, and on both the left and right sides, and in the gas injection step, the gas may be injected within the space between the faceplate and the partition wall.

[0013] Cooling water may be injected as the refrigerant in the above cooling process.

[0014] In the above cooling process, the refrigerant may be partially sprayed onto the outer surface of the nozzle within the area on the faceplate side, specifically onto the outer surface between one or more partition walls attached to the outer surface of the nozzle away from the faceplate and the partition wall.

[0015] To solve the above problems, according to another aspect of the present invention, a waste plastic molded product manufacturing apparatus is provided, comprising: a container for containing waste plastic raw materials; a transfer unit for transferring the waste plastic raw materials, which have been kneaded inside the container and heated to 140°C or higher, toward a faceplate provided at the end of the container; a nozzle provided on the faceplate at the end of the container, which connects the inside of the container with the outside of the container and protrudes from the outer end face of the faceplate on the side of the container; a partition wall attached to the outer circumferential surface of the nozzle, which divides the nozzle into an opening-side region and a faceplate-side region; and a cooling unit for cooling the nozzle to 100°C or lower by spraying a refrigerant onto the outer circumferential surface within the faceplate-side region of the nozzle.

[0016] The apparatus further comprises a cutting section having a rotating blade for cutting the waste plastic material formed by being extruded from the cooled nozzle to the outside of the container, and the partition wall may be positioned along the rotation surface of the rotating blade.

[0017] The system further includes a gas injection unit that injects gas into the water vapor generated by the spraying of the above-mentioned refrigerant, and when the faceplate is viewed from the front, the space between the faceplate and the partition wall may be open to the atmosphere above, below, and on both the left and right sides.

[0018] The nozzle further comprises one or more partition walls attached to its outer circumferential surface, away from the faceplate, and the cooling unit may partially spray refrigerant onto the outer circumferential surface between the partition wall and the spar wall within the area of ​​the nozzle on the faceplate side. [Effects of the Invention]

[0019] As described above, according to the present invention, by suppressing the decrease in the cooling efficiency of the nozzle, a novel and excellent manufacturing apparatus for waste plastic molded products capable of increasing the density of waste plastic molded products and reducing the maintenance burden, and a method for manufacturing waste plastic molded products are provided.

Brief Description of the Drawings

[0020] [Figure 1] It is a front view showing a configuration example of a manufacturing apparatus for waste plastic molded products according to an embodiment of the present invention. [Figure 2] It is a plan view showing a configuration example of a manufacturing apparatus for waste plastic molded products according to the same embodiment. [Figure 3] It is a cross-sectional view taken along line 3-3 in FIG. 1. [Figure 4A] It is a partial cross-sectional view schematically explaining the state of cooling according to the same embodiment. [Figure 4B] It is an end view taken along line A-A' in FIG. 4A. [Figure 5A] It is an external view schematically explaining a waste plastic molded product according to the same embodiment. [Figure 5B] It is an end view taken along line B-B' in FIG. 5A. [Figure 6] It is a flowchart showing an example of a method for manufacturing a waste plastic molded product according to the same embodiment. [Figure 7] It is a front view showing a configuration example of a manufacturing apparatus for waste plastic molded products according to a modification of an embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0021] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

[0022] <1. Configuration of the Manufacturing Apparatus for Waste Plastic Molded Products> The schematic configuration of a waste plastic molded product P manufacturing apparatus 100 according to one embodiment of the present invention will be described with reference to Figures 1 to 3. Figure 1 is a front view showing an example of the configuration of the waste plastic molded product P manufacturing apparatus 100 according to this embodiment. Figure 2 is a plan view showing an example of the configuration of the waste plastic molded product P manufacturing apparatus 100 according to the same embodiment. Figure 3 is a cross-sectional view showing an example of the configuration of the waste plastic molded product P manufacturing apparatus 100 according to the same embodiment.

[0023] The waste plastic molded product P manufacturing apparatus 100 according to this embodiment is an apparatus for molding a waste plastic molded product P having a predetermined shape by kneading and heating a waste plastic raw material M, and then extruding it. The waste plastic molded product P is, for example, inserted into a coke oven together with coal and recycled as a chemical raw material.

[0024] Here, the waste plastic raw material M includes plastic waste, including used plastic containers. Specifically, the waste plastic raw material M includes plastic waste whose main component is resin materials such as polyethylene, polystyrene, or polypropylene.

[0025] The waste plastic raw material M may be partially crushed before being fed into the waste plastic molded product manufacturing apparatus 100. Alternatively, the waste plastic raw material M may be partially kneaded and heated before being fed into the waste plastic molded product manufacturing apparatus 100. In this case, the kneading and heating of the waste plastic raw material M in the container 110 may be omitted or performed in a simplified manner.

[0026] As shown in Figure 1, the manufacturing apparatus 100 for waste plastic molded products P includes a container 110, a transfer unit 120, a communication unit 130, a cooling unit 140, a gas injection unit 190, and a partition wall 200.

[0027] (container) The container 110 is a housing capable of containing waste plastic raw material M. The container 110 has a hopper 113 that opens toward the Z direction at one end 111 in the Y direction in Figure 1. The waste plastic raw material M is introduced into the container 110 via this hopper 113. Inside the container 110, the waste plastic raw material M is kneaded and heated to 140°C or higher.

[0028] If the heating temperature inside the container 110 is less than 140°C, the waste plastic raw material M will not melt sufficiently, and the surface will not solidify sufficiently during the molding process of the waste plastic molded product P, which will be described later. As a result, high density of the waste plastic molded product P will not be achieved. Furthermore, heating the waste plastic raw material M inside the container 110 to 140°C or higher does not mean that the entire area inside the container 110 is heated to 140°C or higher; it is sufficient that the waste plastic raw material M in the vicinity of the communication section 130, which is in a state where it is to be extruded, is heated to 140°C or higher. Specifically, the temperature inside the container 110 is measured by a temperature sensor 170 provided inside the faceplate 117, which will be described later. In addition, the temperature sensor 170 is provided within a range that can detect the heating temperature of the heater 151 provided inside the faceplate 117.

[0029] Furthermore, a portion of the transfer section 120 is provided inside the container 110, and the waste plastic raw material M is transferred by this transfer section 120 toward the other end 115 in the Y direction of the container 110. A faceplate 117 is provided at the other end 115 of the container 110. The faceplate 117 is a plate-shaped member provided at the other end 115 of the container 110, and a communication section 130 is provided on the faceplate 117. Details of the communication section 130 will be described later. The thickness, shape, etc. of the faceplate 117 can be appropriately set considering the pressing force in extrusion molding, etc.

[0030] (transfer department) The transfer unit 120 transfers the waste plastic raw material M inside the container 110 toward the other end 115 of the container 110. Specifically, the transfer unit 120 has a so-called twin-screw extrusion mechanism, as shown in Figure 2. As shown in Figures 1 and 2, the transfer unit 120 includes, for example, a pair of shafts 121 provided axially along the Y direction inside the container 110, a reduction mechanism 123 connected to the axial ends of the shafts 121, and a drive source 125 that applies rotational force to the shafts 121 via the reduction mechanism 123.

[0031] The outer circumferential surfaces of the pair of shafts 121 are provided with screw portions 127 having helical, blade-like sections. These screw portions 127 transfer the waste plastic raw material M from one end 111 to the other end 115 of the container 110 as the shafts 121 rotate. Furthermore, the rotation of the screw portions 127 on the pair of shafts 121 kneads the waste plastic raw material M and heats it through friction. The rotation directions of the pair of shafts 121 may be the same or opposite, and are appropriately set according to the kneading and heating state of the waste plastic raw material M in the container 110.

[0032] Furthermore, a kneading disc portion 129 may be provided on the pair of shafts 121. As shown in Figure 2, the kneading disc portion 129 is provided in the axial middle of the shaft 121. The rotation of the kneading disc portions 129 provided on the pair of shafts 121 further kneads the waste plastic raw material M and heats it up through friction.

[0033] (Communication part) As shown in Figure 1, the connecting portion 130 is a cylindrical portion with a circular cross-section provided at the other end of the container 110, and connects the inside and outside of the container 110. The waste plastic raw material M is extruded through the connecting portion 130, molded into a predetermined shape, and becomes a waste plastic molded product P.

[0034] As shown in Figure 3, multiple communication sections 130 are provided on the faceplate 117 of the container 110. In particular, the communication sections 130 are provided circumferentially at positions corresponding to the outer circumference of the screw section 127 on the faceplate 117. The communication sections 130 also have nozzles 131 protruding from the outer end face 117A of the faceplate 117. The presence of the nozzles 131 increases the distance over which the waste plastic raw material M comes into contact with the inner circumferential surface 131A of the communication section 130. As a result, the molten surface of the waste plastic raw material M can be solidified by cooling due to heat dissipation associated with contact with the communication section 130, which is kept below a predetermined temperature, as will be described later.

[0035] Furthermore, the moldability of the waste plastic molded product P is improved by increasing the distance over which the waste plastic raw material M contacts the inner circumferential surface 131A of the communication portion 130. That is, after extrusion molding, the waste plastic molded product P has a predetermined diameter. For example, the distance L of the nozzle 131 is set to 20 mm or more.

[0036] (cooling section) The cooling unit 140 cools the communication section 130 to 100°C or below. If the temperature of the communication section 130 remains above 100°C even after cooling by the cooling unit 140, the surface of the molten waste plastic raw material M will not solidify sufficiently. As a result, high density of the waste plastic molded product P will not be achieved. Furthermore, cooling the communication section 130 to 100°C or below does not mean that the entire area of ​​the communication section 130 is cooled to 100°C or below; it is sufficient that the communication section 130 in the area necessary for solidifying the waste plastic raw material M is cooled to 100°C or below. Specifically, as shown in Figure 1, the temperature of the communication section 130 is measured by a temperature sensor 131C provided on the communication section 130. In addition, the temperature sensor 131C is located directly below the water-cooling nozzle 141, which will be described later, and is positioned to measure the temperature of the intermediate portion of the radial thickness of the communication section 130 (see Figure 4A, described later). An example of a temperature sensor 131C is a thermocouple.

[0037] Furthermore, as for the area of ​​the communication section 130 that is cooled, for example, it is sufficient if at least half of the total length of the communication section 130, specifically the tip side (the side outside the container 110), is cooled to 100°C or below. In this case, the temperature sensor 131C is provided on the tip side of the communication section 130 in the longitudinal direction of the communication section 130.

[0038] Preferably, the cooling section 140 cools the communication section 130 to 70°C or below. By keeping the communication section 130 at 70°C or below, the surface of the molten waste plastic raw material M is more thoroughly solidified. As a result, the expansion of the waste plastic raw material M after extrusion molding is further suppressed, and the density of the waste plastic molded product P is increased.

[0039] In particular, the communication section 130 is cooled by heat removal using cooling water W supplied by the cooling section 140. By cooling with cooling water W, which has relatively high cooling efficiency, the molten surface of the waste plastic raw material M is efficiently solidified.

[0040] As shown in Figure 1, the cooling unit 140 includes a water-cooling nozzle 141 and a pump 143 that supplies cooling water W to the water-cooling nozzle 141. The tip of the water-cooling nozzle 141 is positioned opposite the communication unit 130, and cooling water W is sprayed from the tip of the water-cooling nozzle 141 onto the outer circumferential surface 131B of the nozzle 131 of the communication unit 130. As shown in Figure 3, the cooling unit 140 has a plurality of water-cooling nozzles 141, with one water-cooling nozzle 141 provided for each nozzle 131 of the communication unit 130. The spraying of cooling water W includes a form in which a stream of cooling water W flows out toward the communication unit 130, or a form in which mist-like cooling water W is sprayed toward the communication unit 130.

[0041] By spraying cooling water W onto the outer circumferential surface 131B of the nozzle 131 of the communication section 130, the contact area between the cooling water W and the communication section 130 becomes larger compared to the case without the nozzle 131. As a result, the cooling efficiency of the cooling section 140 becomes higher. In addition, by spraying cooling water W onto the outer circumferential surface 131B of the nozzle 131, direct contact of the cooling water W with the waste plastic raw material M during extrusion molding is suppressed, and the amount of excess moisture contained in the waste plastic molded product P is reduced.

[0042] (water vapor) When cooling water W is sprayed onto the communication section 130, water vapor S is generated from the communication section 130 and its surroundings. In this embodiment, since cooling water W is sprayed continuously during the molding process, water vapor S is also generated continuously. A portion of the sprayed cooling water W becomes water vapor S and accumulates around the nozzle of the communication section 130.

[0043] Even if the nozzle of the communication section 130 is cooled to below 100°C, the temperature of the nozzle of the communication section 130 fluctuates during the molding process. That is, a state in which the temperature of the nozzle of the communication section 130 is 100°C is formed during the fluctuations. Also, during the molding process, a state in which the temperature of the nozzle of the communication section 130 is 100°C or higher may occur. For this reason, even if the nozzle of the communication section 130 is cooled to below 100°C, water vapor S may be generated from the nozzle of the communication section 130 during the molding process. Note that water vapor S may be generated not only from the nozzle of the communication section 130, but also from the faceplate 117 that comes into contact with the cooling water around the communication section 130.

[0044] (Gas injection section) As shown in Figure 1, the gas injection unit 190 has an air nozzle 191 opening near the faceplate 117 and an air pump 193 connected to the air nozzle 191. The air pump 193 is connected to the control unit 180. The gas injection unit 190 injects gas G into the water vapor S generated by the spraying of cooling water W. Note that in Figure 2, the gas injection unit 190 is omitted from the illustration for clarity.

[0045] As shown in Figure 3, in this embodiment, gas G is injected from air nozzles 191 located at multiple positions. Specifically, two air nozzles 191 positioned vertically spaced apart on the left side of Figure 3 each inject gas G toward the upper right. Also, two air nozzles 191 positioned vertically spaced apart on the right side of Figure 3 each inject gas G toward the upper left.

[0046] In this embodiment, Figure 3 illustrates a case where two air nozzles 191 are arranged on each of the two left and right sides of the rectangular faceplate 117, but the present invention is not limited to this. For example, one or more air nozzles 191 may be arranged on only one of the four sides of the rectangular faceplate 117 (top, bottom, left, or right), and the arranged one or more air nozzles 191 may inject gas into the nozzle of the communication section 130 from only one direction. In the present invention, regardless of the shape of the faceplate and the arrangement pattern of one or more communication sections, one or more air nozzles may be arranged at any position within 360° around the communication section when the faceplate is viewed from the front, with any injection direction.

[0047] Furthermore, as shown in Figure 3, when viewing the faceplate 117 from the front, the air nozzle 191 is positioned away from the water-cooling nozzle 141 so as not to overlap with it. Therefore, in this embodiment, it is possible to inject gas G at a position away from the position where the cooling water W is sprayed. In addition, in this invention, when viewing the faceplate 117 from the front, the air nozzle 191 and the water-cooling nozzle 141 may be positioned at the same location so as to overlap with each other.

[0048] (heating part) The waste plastic molded product P manufacturing apparatus 100 has a heating unit 150 that can adjust the temperature around the faceplate 117. As shown in Figure 1, the heating unit 150 is, for example, a resistance heating type heater 151 provided inside the faceplate 117. The heater 151 is connected to a heating power supply 153 and heats the faceplate 117 and its vicinity by generating heat inside the faceplate 117. The heating by the heating unit 150 provided on the faceplate 117 at the other end 115 of the container 110 suppresses the temperature drop of the waste plastic raw material M. In other words, the molten state of the waste plastic raw material M inside the communication section 130 is maintained until just before cooling by the cooling unit 140.

[0049] (cutting part) The manufacturing apparatus 100 for waste plastic molded products P has a cutting section 160. As shown in Figure 1, the cutting section 160 includes, for example, a rotating blade 161, a drive source 163, and a cutting shaft 165. The rotating blade 161 is a part with a blade at the end of an arm that extends radially. One end of the cutting shaft 165 is provided at the radial center of the arm of the rotating blade 161. The drive source 163 is attached to the other end of the cutting shaft 165. The drive source 163 applies rotational force to the rotating blade 161 via the cutting shaft 165. The waste plastic raw material M extruded from the communication section 130 is cut by contact with the rotating blade 161, and becomes a waste plastic molded product P.

[0050] Furthermore, the cutting section 160 cuts the waste plastic raw material M that has been extruded in the connecting section 130, which is kept below a predetermined temperature. The waste plastic raw material M is formed by being extruded from the cooled connecting section 130 to the outside of the container 110. As a result, the outer surface of the waste plastic raw material M solidifies, and the outer shape of the waste plastic raw material M is maintained, making it easy to cut. Moreover, the cutting location is better controlled compared to when the waste plastic raw material M breaks at an appropriate length due to its own weight, or when the waste plastic raw material M expands after extrusion molding without its outer surface solidifying. As a result, the shape and dimensions of the waste plastic molded product P become uniform, and in addition to increasing the density of the waste plastic molded product P, an improvement in bulk density is achieved.

[0051] (bulkhead) As shown in Figure 4A, the partition wall 200 divides the area R1 on the opening side of the nozzle 131 and the area R2 on the faceplate 117 side of the nozzle 131. In this embodiment, the partition wall 200 is rectangular, but in the present invention, the shape of the partition wall can be set as appropriate. In this embodiment, the material of the partition wall 200 is, for example, an iron plate, but in the present invention, the material of the partition wall may be other materials.

[0052] In this embodiment, the length of the partition wall 200 in the vertical direction (Z direction) and the length in the horizontal direction (X direction) in Figure 3 is longer than that of the faceplate 117. That is, the partition wall 200 has a larger outer shape than the faceplate 117 in the XZ plane as viewed from the front. However, in the present invention, the dimensions of the partition wall are not limited to this and can be changed as appropriate, as long as it prevents a portion of the waste plastic molded product from adhering to the surface of the nozzle 131.

[0053] Furthermore, in this invention, for example, the thickness of the partition wall 200 may be increased in order to enhance the strength of the component against impact and damage when the rotating blade 161 comes into contact with the partition wall 200. One way to increase the thickness is to bond two iron plates together.

[0054] As shown in Figure 2, the partition wall 200 is attached to the faceplate 117 by fasteners 220 such as bolts. The number of fasteners 220 can be set to one or more as desired. Note that in Figure 1, the fasteners 220 are not shown for clarity. The partition wall 200 is installed facing the faceplate 117 with a gap between them, at a certain distance apart.

[0055] Furthermore, in this embodiment, the auxiliary wall 210 is provided opposite the partition wall 200 at the base side of the nozzle 131 (to the right of the nozzle 131 in Figure 1), in contact with the faceplate 117.

[0056] In this embodiment, the auxiliary wall 210 is made of the same steel plate as the partition wall 200 and has substantially the same dimensions and shape as the partition wall 200. Therefore, in this embodiment, the auxiliary wall 210 has a larger outer shape than the faceplate 117 in the XZ plane when viewed from the front. By providing the auxiliary wall 210, the cooling water W is prevented from splashing towards the faceplate 117, and as a result, the decrease in the cooling efficiency of the nozzle 131 can be suppressed. The material, dimensions, shape, etc. of the auxiliary wall 210 of the present invention can be changed as appropriate, similar to the partition wall 200.

[0057] In this embodiment, a space F serving as a water spraying area is formed between the partition wall 200 and the auxiliary wall 210, and the upper, lower, and left and right sides of space F are open to the atmosphere. However, the auxiliary wall 210 is not essential in this invention. In this invention, even without the auxiliary wall 210, a water spraying area may be formed between the faceplate 117 and the partition wall 200, and the upper, lower, and left and right sides of the space sandwiched between the faceplate 117 and the partition wall 200 may be open to the atmosphere. In other words, in this invention, regardless of the presence or absence of the auxiliary wall 210, the cooling water W only needs to be sprayed onto the outer circumferential surface of the region R2 on the faceplate 117 side of the nozzle 131.

[0058] The width of the space F formed between the partition wall 200 and the auxiliary wall 210 (length in the Y direction in Figure 1) can be set to, for example, about 50 mm, but the present invention is not limited to this and can be changed as appropriate.

[0059] Furthermore, in this embodiment, the partition wall 200 is attached to the outer circumferential surface 131B of the nozzle 131 on the side of the cut portion 160, away from the faceplate 117. Specifically, a through hole is formed in the partition wall 200 at a position corresponding to the opening of the nozzle 131. The diameter of the through hole in the partition wall 200 is approximately the same as the outer diameter of the opening of the nozzle 131. The opening of the nozzle 131 fits into the through hole in the partition wall 200. Therefore, there is virtually no gap between the inner circumferential surface of the through hole in the partition wall 200 and the outer circumferential surface of the opening of the nozzle 131, and they are in close contact.

[0060] In addition, in this invention, a seal may be provided between the inner circumferential surface of the through-hole of the partition wall 200 and the outer circumferential surface of the opening of the nozzle 131. The seal can enhance the adhesion effect of a portion of the waste plastic molded product P to the surface of the nozzle 131.

[0061] Furthermore, in this embodiment, as shown in Figure 4A, the outer surface of the partition wall 200 on the cut portion 160 side is flush with the end face of the opening of the nozzle 131. Therefore, the region R1 on the opening side of the nozzle 131 is substantially only the end face portion of the nozzle 131. Also, the region R2 on the faceplate 117 side of the nozzle 131 is the outer peripheral surface 131B portion of the nozzle 131, located to the right of the partition wall 200 in Figure 4A.

[0062] In this invention, it is not essential that the outer surface of the partition wall 200 on the side of the cut portion 160 be flush with the end face of the opening of the nozzle 131. For example, in this invention, the outer surface of the partition wall 200 on the side of the cut portion 160 may be offset from the end face of the opening of the nozzle 131 toward the faceplate 117, so that the outer peripheral surface of the nozzle 131 on the opening side partially protrudes from the partition wall 200 toward the cut portion 160.

[0063] When the outer peripheral surface of the nozzle 131 on the opening side partially protrudes from the partition wall 200 toward the cutting portion 160, the portion of the outer peripheral surface of the nozzle 131 on the opening side and the portion of the end face of the nozzle 131 constitute the region R1 on the opening side of the nozzle 131. In other words, as long as the adhesion of a portion of the molded product to the surface (outer peripheral surface) of the nozzle 131 in the portion required as a cooling region is prevented, the position of the outer surface of the partition wall 200 toward the cutting portion 160 on the outer peripheral surface 131B of the nozzle 131 is not limited.

[0064] In this embodiment, as shown in Figure 2, the partition wall 200 is positioned along the rotation surface 161A of the rotating blade 161. The rotation surface 161A is the rotational trajectory of the rotating blade 161. However, in this invention, it is not essential that the partition wall 200 is positioned along the rotation surface 161A of the rotating blade 161.

[0065] (Temperature sensor, control unit) As shown in Figure 1, the waste plastic molded product P manufacturing apparatus 100 has a temperature sensor 170 capable of detecting the temperature around the faceplate 117. The temperature sensor 170 is, for example, a thermocouple used while inserted inside the faceplate 117.

[0066] Furthermore, the waste plastic molded product P manufacturing apparatus 100 has a control unit 180, as shown in Figure 1. The control unit 180 controls the molding process of the waste plastic molded product P in the waste plastic molded product P manufacturing apparatus 100. Specifically, when cooling by the cooling unit 140, the control unit 180 controls the amount and pressure of the cooling water W sprayed based on the output from the temperature sensor 131C. The control unit 180 also controls the flow rate of gas G injected by the gas injection unit 190 based on the output from the temperature sensor 131C. The control unit 180 also controls the heating around the faceplate 117 by the heating unit 150 based on the output from the temperature sensor 170. In addition, the control unit 180 controls the rotation speed of the drive source 163 of the cutting unit 160 and the drive source 125 of the transfer unit 120. The functions of the control unit 180 are realized, for example, through the cooperation of a CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), etc. The general configuration of the waste plastic molded product P manufacturing apparatus 100 according to this embodiment has been described above.

[0067] <2. Molding process of waste plastic molded products> Next, the molding process of the waste plastic molded product P according to this embodiment will be described with reference to Figures 4A, 4B, 5A, and 5B. Figure 4A is a schematic partial cross-sectional view illustrating the cooling process according to this embodiment. Figure 4B is an end view taken along line A-A' in Figure 4A. Figure 5A is a schematic external view illustrating the waste plastic molded product P according to this embodiment. Figure 5B is an end view taken along line B-B' in Figure 5A.

[0068] First, the waste plastic raw material M, which has been kneaded in the container 110 and heated to over 140°C, is transferred within the container 110 toward the other end 115 where the faceplate 117 is located. At this time, the waste plastic raw material M, heated to over 140°C, is at least molten on its outer surface within the container 110. Subsequently, as shown in Figure 4A, the waste plastic raw material M passes through the communication section 130 while being extruded. At this time, the temperature of the waste plastic raw material M decreases due to heat dissipation associated with the contact between the waste plastic raw material M and the inner circumferential surface 131A of the communication section 130. In particular, if the communication section 130 has a nozzle 131, the temperature of the waste plastic raw material M decreases further as the distance over which friction occurs increases.

[0069] Furthermore, the communication section 130 is cooled by the cooling section 140 for at least the duration that the waste plastic raw material M is being pushed out. Here, the cooling section 140 cools the communication section 130 to below 100°C, which is the temperature at which solidification of the molten waste plastic raw material M begins. Specifically, the cooling section 140 sprays cooling water W onto the outer circumferential surface 131B of the communication section 130. The gas injection section 190 also injects gas G into the water vapor S generated by the spraying of the cooling water W. The injection of gas G causes the water vapor S to be exhausted from around the communication section 130, preventing it from accumulating around the communication section 130. As a result, cooling of the communication section 130 proceeds while suppressing a decrease in the cooling efficiency of the communication section 130.

[0070] Therefore, as the waste plastic raw material M passes through the communication section 130, it solidifies from the outer circumference in contact with the communication section 130. That is, as shown in Figure 4B, the waste plastic raw material M is pushed out of the communication section 130, forming a solidified region M1 on its outer circumference, and is molded as a waste plastic molded product P. Since a solidified region P1 is formed on the outer circumference of the waste plastic molded product P while passing through the communication section 130, the expansion of the waste plastic molded product P radially outward is suppressed even after it is pushed out of the communication section 130.

[0071] As shown in Figure 5A, the waste plastic molded product P according to this embodiment is a short, roughly rod-shaped molded product with a hard outer shell. Furthermore, as shown in Figure 5B, the waste plastic molded product P has a solidified region P1 formed on the outer surface side when viewed in cross-section. Compared with the waste plastic molded product Q without cooling, whose outer shape is shown by a dashed line in Figure 5B, the waste plastic molded product P according to this embodiment has suppressed radial expansion. The molding process of the waste plastic molded product P according to this embodiment has been described above.

[0072] <3. Method for manufacturing waste plastic molded products> Next, the method for manufacturing the waste plastic molded product P according to this embodiment will be described with reference to Figure 6. Figure 6 is a flowchart showing an example of the method for manufacturing the waste plastic molded product P according to this embodiment. As shown in Figure 6, first, the waste plastic raw material M is put into the container 110 (S101). Subsequently, the waste plastic raw material M is kneaded and heated in the container 110 (S103). At this time, water may be sprayed into the container 110 to adjust the temperature inside the container 110.

[0073] Furthermore, the waste plastic raw material M, heated to 140°C or higher, is transferred toward a communication section 130 provided at the end of the container 110, which connects the inside and outside of the container 110 (S105). In step S105, the waste plastic raw material M is transferred toward the end of the container 110, and the waste plastic raw material M is pushed out through the communication section 130. At this time, while the waste plastic raw material M is being pushed out through the communication section 130, the communication section 130 is cooled to 100°C or lower (S107). In the cooling step (S107) of this embodiment, the cooling water W is sprayed onto the outer circumferential surface of the area R2 on the faceplate 117 side of the nozzle 131 within the space F between the partition wall 200 and the auxiliary wall 210. The cooling water W is also sprayed parallel to the faceplate 117. Water vapor S is generated by the spraying of the cooling water W.

[0074] Furthermore, in step S108, gas G is injected into the generated water vapor S. In this embodiment, in the gas injection step (S108), gas G is injected parallel to the faceplate 117, similar to the spraying direction of the cooling water W.

[0075] In this embodiment, the case in which the gas G is injected parallel to the faceplate 117 is illustrated, but in the present invention, it is not necessary to do so parallel to the faceplate 117. For example, if it is difficult to secure grounding space for the gas injection unit 190 near the water cooling nozzle 141, the gas injection unit 190 can be installed in the gap between multiple cutting units 160 (cutting machines) arranged opposite the opening of the communication unit 130, and the gas G can be injected toward the faceplate 117 from the gap between the multiple cutting units 160. Furthermore, even if it is difficult to inject the gas G parallel to the faceplate 117 in line with the spraying direction of the cooling water W, it is possible to inject enough gas G to exhaust the water vapor S by, for example, using a large-capacity fan or blower.

[0076] Finally, the waste plastic raw material M is extruded from the connecting section 130 and cut by the cutting section 160 to form the waste plastic molded product P.

[0077] In the method for producing the waste plastic molded product P according to this embodiment, steps S103 and S105 have been described as separate processes, but these processes may be performed simultaneously. That is, the waste plastic raw material M may be kneaded and heated in the container 110 while being transferred to the other end 115 of the container 110.

[0078] Furthermore, the cooling step S107 and the gas injection step S108 may start simultaneously, or the gas injection step may start after the cooling step. Also, the gas injection step is performed in parallel with the cooling step, but it may be performed in parallel throughout the entire duration of the cooling step, or it may be performed intermittently in parallel with one or more pauses in between. The above describes a method for manufacturing a waste plastic molded product P according to one embodiment of the present invention.

[0079] (Effects and Benefits) In this embodiment, the partition wall 200 separates the nozzle 131 into two regions: R1 on the opening side and R2 on the faceplate 117 side. The cooling water W, which is the refrigerant, is sprayed onto the outer surface of region R2 on the faceplate 117 side of the nozzle 131. Therefore, even if some of the waste plastic molded product P is ejected from the opening of the nozzle 131, it is difficult for some of the waste plastic molded product P to move to region R2 on the faceplate 117 side of the nozzle 131. Thus, it is prevented that some of the waste plastic molded product P will adhere to the surface of the nozzle 131. As a result, a decrease in the cooling efficiency of the communication section can be suppressed, and the cooling efficiency can be stably maintained.

[0080] Furthermore, in this embodiment, the space sandwiched between the partition wall 200 and the faceplate 117 functions as a spraying area for the cooling water W, which is the refrigerant. Within the spraying area, water vapor is exhausted from around the nozzle 131 by the injected gas. Here, since the top, bottom, and both sides of the spraying area are open to the atmosphere, all four sides of the spraying area—top, bottom, and both sides—can be used as exhaust paths to the atmosphere when exhausting water vapor. For this reason, water vapor can be exhausted from the communication section more quickly compared to when all four sides of the spraying area are not open to the atmosphere.

[0081] In this embodiment, cooling water W is injected as a refrigerant. Here, even if the waste plastic molded product P contains impurities, the partition wall 200 prevents the impurities from mixing into the cooling water W. Examples of impurities contained in the waste plastic molded product P include chlorine dissolved from polyvinyl chloride. Therefore, it is possible to prevent an increase in environmental burden due to the discharge of cooling water W contaminated with impurities into sewage systems, etc. Furthermore, if the cooling water W contaminated with impurities is recovered and the recovered cooling water W is reused, it is possible to avoid a decrease in cooling efficiency due to the impurities.

[0082] Furthermore, in this embodiment, the rotating blade 161 is positioned along the rotating surface 161A of the rotating blade 161, so that the rotating blade does not come into contact with the partition wall 200.

[0083] <Other Embodiments> Although preferred embodiments of the present invention have been described in detail above with reference to the attached drawings, the present invention is not limited to these examples. It is clear to any person with ordinary skill in the art to which the present invention belongs that various modifications or applications can be conceived within the scope of the technical idea described in the claims, and these are also understood to naturally fall within the technical scope of the present invention.

[0084] For example, the above embodiment shows an example of twin-screw extrusion with a pair of shafts, but the present invention is not limited to such an example. For example, it may also be unscrew extrusion with a single shaft.

[0085] Furthermore, although the above embodiment shows an example where the refrigerant is water, the present invention is not limited to such examples. For example, cooling may be performed by air cooling using air as the refrigerant, or cooling may be performed using a liquid refrigerant capable of cooling the communication portion 130 (oil cooling, cooling with a polymer aqueous solution, etc.).

[0086] <Variation> Next, as an example of another embodiment, a modified waste plastic molded product manufacturing apparatus 100A will be described with reference to Figure 7. As shown in Figure 7, the waste plastic molded product manufacturing apparatus 100A further includes a partition wall 222 in addition to the configuration of the waste plastic molded product manufacturing apparatus 100 illustrated in Figure 1. Since the configuration of the waste plastic molded product manufacturing apparatus 100A according to the modified embodiment, other than the partition wall 222, is the same as that of the waste plastic molded product manufacturing apparatus 100 according to this embodiment, the following description will mainly focus on the partition wall 222, and the description of the configuration other than the partition wall 222 will be omitted.

[0087] (Partition wall) As shown in Figure 7, the partition wall 222 is attached to the outer circumferential surface of the nozzle 131, away from the faceplate 117. The partition wall 222 separates the outer circumferential surface between the partition wall 200 and the faceplate 117 within the area of ​​the nozzle 131 on the faceplate 117 side.

[0088] In this embodiment, the partition wall 222 is rectangular, but in the present invention, the shape of the partition wall can be set as appropriate. In this embodiment, the material of the partition wall 222 is, for example, a steel plate, but in the present invention, the material of the partition wall may be other materials. Also, in the modified example illustrated in Figure 7, there are two partition walls 222, but in the present invention, there may be one partition wall, or there may be three or more.

[0089] In this embodiment, the vertical length (Z direction) and depth (X direction) of the partition wall 222 in Figure 7 are longer than those of the panel 117. That is, the partition wall 222 has a larger outer shape than the panel 117 in the XZ plane as viewed from the front. However, in the present invention, the dimensions of the partition wall are not limited to this and can be changed as appropriate. The dimensions and shape of the partition wall in the present invention can be changed as appropriate, similar to the partition wall 200.

[0090] The partition wall 222 can be attached to the panel 117 by fasteners such as bolts, similar to the fasteners 220 in the partition wall 200 exemplified in Figure 2. In Figure 7, for ease of viewing, the fasteners for attaching the partition wall 222 are not shown. The number of fasteners for attaching the partition wall 222 can be set to one or more as desired.

[0091] In the modified example illustrated in Figure 7, the partition wall 222 is installed parallel to the partition wall 200 and the panel 117. However, in this invention, it is not essential that the partition wall 222 is parallel to the partition wall 200 and the panel 117.

[0092] A through-hole is formed in the partition wall 222 at a position corresponding to the outer circumferential surface of the nozzle 131. The diameter of the through-hole in the partition wall 222 is approximately the same as the outer diameter of the outer circumferential surface of the nozzle 131. The outer circumferential surface of the nozzle 131 fits into the through-hole in the partition wall 222. Therefore, there is virtually no gap between the inner circumferential surface of the through-hole in the partition wall 222 and the outer circumferential surface of the nozzle 131, and they are in close contact.

[0093] In addition, in this invention, a seal may be provided between the inner circumferential surface of the through-hole in the partition wall 222 and the outer circumferential surface of the nozzle 131. The seal can enhance the adhesion effect of a portion of the waste plastic molded product P to the surface of the nozzle 131.

[0094] Furthermore, in the modified version, the mounting position of the partition wall 222 relative to the panel 117 can be changed along the Y direction, as shown in the right partition wall 222 of the two partition walls 222 in Figure 7. Figure 7 illustrates that the mounting position of the partition wall 222 can be changed by the dashed lines representing the partition wall 222. Specifically, the mounting position of the partition wall 222 can be changed, for example, by changing the length of the protrusion of the fixing device for attaching the partition wall 222 from the panel 117. Alternatively, the mounting position of the partition wall 222 may be changed by other known methods. By changing the mounting position of the partition wall 222 relative to the panel 117, the separation distance between the partition wall 222 and the bulkhead 200 is also changed.

[0095] In a modified example, the separation distance D formed between the partition wall 200 and the partition wall 222 furthest from the partition wall 200 (the rightmost of the two partition walls 222 in Figure 7) is, for example, about 30 mm. However, in this invention, the separation distance between the partition wall and the partition wall is not limited to this and can be changed as appropriate.

[0096] In the modified configuration, the space F, which serves as a water-spraying area formed between the partition wall 200 and the auxiliary wall 210, is further divided into multiple sections along the length direction (Y direction) of the nozzle 131 by the partition wall 222. In this modified configuration, the amount of cooling water W sprayed from the water-cooling nozzle 141 can be changed for each section separated by the partition wall 222. Figure 7 illustrates a case where the space F is divided into three sections along its length, and also illustrates a state in which cooling water W is sprayed from the water-cooling nozzle 141 to the central part of the three divided spaces F.

[0097] In other words, the water-cooled nozzle 141 of the cooling unit 140 partially sprays refrigerant onto the outer surface of the nozzle 131 within the area on the faceplate 117 side, specifically the outer surface between the partition wall 200 and the partition wall 222. In other words, the cooling pattern of the nozzle 131 is refined.

[0098] In the modified waste plastic molded product manufacturing apparatus 100A, similar to the waste plastic molded product manufacturing apparatus 100 according to this embodiment, it is possible to increase the density of the waste plastic molded product P and reduce the maintenance burden. In the modified example, the water-cooled nozzle 141 of the cooling unit 140 partially sprays refrigerant onto the outer peripheral surface between the partition wall 222 and the partition wall 200 within the area of ​​the nozzle 131 on the faceplate 117 side. As a result, the partition wall 222 prevents the cooling water W from splashing onto the faceplate 117 side. Also, since there is a gap between the partition wall 222 and the faceplate 117, even if the temperature of the partition wall 222 decreases due to contact with the cooling water W, the temperature decrease of the partition wall 222 does not easily affect the faceplate 117. As a result, variations in heating on the faceplate 117 can be reduced.

[0099] In another modified configuration, the partition wall 222 allows cooling water W to be sprayed to specific parts of the nozzle 131 that protrude outward from the faceplate 117, while preventing it from being sprayed to other parts. In other words, the spraying position of the cooling water W can be adjusted. For this reason, for example, by preventing cooling water W from being sprayed to the base and tip of the nozzle 131, excessive cooling of the base and tip can be suppressed. By suppressing excessive cooling, clogging of the waste plastic molded product P at the base and tip of the nozzle 131 can be prevented, thereby improving the productivity of the waste plastic molded product P.

[0100] Furthermore, in another embodiment, the present invention can also be constructed by combining parts of the waste plastic molded product manufacturing apparatus shown in Figures 1 to 7.

[0101] ≪Note≫ The following embodiments are conceptualized herein.

[0102] Embodiment 1 is, The raw material input process involves putting waste plastic raw materials into a container, A kneading and heating step in which the waste plastic raw material is kneaded and heated in the container, A transfer process for transferring the waste plastic raw material, heated to 140°C or higher, toward a nozzle that is provided on a faceplate at the end of the container, which connects the inside and outside of the container, and which protrudes from the outer end face of the faceplate on the container side. A cooling step is performed by spraying a refrigerant onto the outer surface of the nozzle in the area on the faceplate side, which is separated from the area on the opening side of the nozzle by a partition wall attached to the outer surface of the nozzle, thereby cooling the nozzle to 100°C or below for at least the duration that the waste plastic material is pushed out of the nozzle. A method for manufacturing waste plastic molded products, including the following:

[0103] Embodiment 2 is, The system further includes a gas injection step in which gas is injected into the water vapor generated by the spraying of the refrigerant, When the panel is viewed from the front, the space between the panel and the partition wall is open to the atmosphere above, below, and on both sides. In the gas injection step, the gas is injected within the space sandwiched between the faceplate and the partition wall. A method for manufacturing a waste plastic molded product as described in Embodiment 1.

[0104] Embodiment 3 is, In the aforementioned cooling process, cooling water is injected as the refrigerant. A method for manufacturing waste plastic molded articles according to embodiment 1 or 2.

[0105] Appearance 4 is, In the cooling step, the refrigerant is partially sprayed onto the outer surface of the nozzle within the area on the faceplate side, specifically onto the outer surface between one or more partition walls attached to the outer surface of the nozzle away from the faceplate and the partition wall. A method for manufacturing waste plastic molded articles according to any one of embodiments 1 to 3.

[0106] Embodiment 5 is, A container that holds waste plastic raw materials inside, A transfer unit that transfers the waste plastic raw material, which has been kneaded inside the container and heated to 140°C or higher, toward a faceplate provided at the end of the container, A nozzle is provided on the faceplate at the end of the container, connecting the inside of the container with the outside of the container, and protruding from the outer end face of the faceplate on the container side. A partition wall attached to the outer circumferential surface of the nozzle divides the area on the opening side of the nozzle from the area on the faceplate side of the nozzle, A cooling unit that cools the nozzle to 100°C or below by spraying a refrigerant onto the outer surface within the area of ​​the nozzle on the faceplate side, A manufacturing apparatus for waste plastic molded products, equipped with the following features.

[0107] Embodiment 6 is, The device further comprises a cutting section having a rotating blade for cutting the waste plastic raw material, which is formed by being extruded from the cooled nozzle to the outside of the container, The partition wall is positioned along the rotation plane of the rotating blade. A manufacturing apparatus for waste plastic molded products as described in Embodiment 5.

[0108] Embodiment 7 is, The system further includes a gas injection unit that injects gas into the water vapor generated by the spraying of the aforementioned refrigerant, When the panel is viewed from the front, the space between the panel and the partition wall is open to the atmosphere above, below, and on both the left and right sides. A manufacturing apparatus for waste plastic molded products according to embodiment 5 or 6.

[0109] Embodiment 8 is, The nozzle further comprises one or more partition walls attached to its outer peripheral surface, away from the faceplate, The cooling unit partially sprays refrigerant onto the outer surface of the nozzle within the area on the faceplate side, specifically onto the outer surface between the partition wall and the partition wall. A manufacturing apparatus for waste plastic molded products according to any one of embodiments 5 to 7. [Explanation of symbols]

[0110] 100, 100A Waste Plastic Molding Manufacturing Equipment 110 Container 117 Face plate 117A End face 120 Transfer section 130 Communication section 131 Nozzles 131A Inner surface of nozzle 131B Nozzle outer surface 140 Cooling section 150 Heating section 160 Cutting section 161 Rotary blades 161A Rotation surface 190 Gas injection unit 200 Bulkhead 210 Auxiliary wall 222 Partition wall R1 Nozzle opening side region R2 Nozzle faceplate side area F The space between the panel and the partition wall G Gas M Waste plastic raw materials P Waste plastic molded products S Water vapor W Cooling water

Claims

1. The raw material input process involves putting waste plastic raw materials into a container, A kneading and heating step in which the waste plastic raw material is kneaded and heated in the container, A transfer process for transferring the waste plastic raw material, heated to 140°C or higher, toward a nozzle that is provided on a faceplate at the end of the container, which connects the inside and outside of the container, and which protrudes from the outer end face of the faceplate on the container side. A cooling step in which a refrigerant is sprayed onto the outer surface of the nozzle on the faceplate side, which is separated from the opening side of the nozzle by a partition wall attached to the outer surface of the nozzle, thereby cooling the nozzle to 100°C or below for at least the duration that the waste plastic material is pushed out of the nozzle. A method for manufacturing waste plastic molded products, including the following:

2. The system further includes a gas injection step in which gas is injected into the water vapor generated by the spraying of the refrigerant, When the panel is viewed from the front, the space between the panel and the partition wall is open to the atmosphere above, below, and on both sides. In the gas injection step, the gas is injected within the space sandwiched between the faceplate and the partition wall. A method for producing a waste plastic molded product according to claim 1.

3. In the aforementioned cooling process, cooling water is injected as the refrigerant. A method for producing a waste plastic molded product according to claim 1 or 2.

4. In the cooling step, the refrigerant is partially sprayed onto the outer surface of the nozzle within the area on the faceplate side, specifically onto the outer surface between one or more partition walls attached to the outer surface of the nozzle away from the faceplate and the partition wall. A method for producing a waste plastic molded product according to claim 1 or 2.

5. A container that holds waste plastic raw materials inside, A transfer unit that transfers the waste plastic raw material, which has been kneaded inside the container and heated to 140°C or higher, toward a faceplate provided at the end of the container, A nozzle is provided on the faceplate at the end of the container, connecting the inside of the container with the outside of the container, and protruding from the outer end face of the faceplate on the container side. A partition wall attached to the outer circumferential surface of the nozzle divides the area on the opening side of the nozzle from the area on the faceplate side of the nozzle, A cooling unit that cools the nozzle to 100°C or below by spraying a refrigerant onto the outer surface within the area of ​​the nozzle on the faceplate side, A manufacturing apparatus for waste plastic molded products, equipped with the following features.

6. The device further comprises a cutting section having a rotating blade for cutting the waste plastic raw material, which is formed by being extruded from the cooled nozzle to the outside of the container, The partition wall is positioned along the rotation plane of the rotating blade. The apparatus for manufacturing waste plastic molded products according to claim 5.

7. The system further includes a gas injection unit that injects gas into the water vapor generated by the spraying of the aforementioned refrigerant, When the panel is viewed from the front, the space between the panel and the partition wall is open to the atmosphere above, below, and on both the left and right sides. The apparatus for manufacturing waste plastic molded products according to claim 5 or 6.

8. The nozzle further comprises one or more partition walls attached to its outer peripheral surface, away from the faceplate, The cooling unit partially sprays refrigerant onto the outer surface of the nozzle within the area on the faceplate side, specifically onto the outer surface between the partition wall and the partition wall. The apparatus for manufacturing waste plastic molded products according to claim 5 or 6.

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