Plastic product forming processing production line

Abstract

The invention relates to the technical field of plastic molding, and provides a plastic product molding processing production line, which comprises a feeding system for weighing and conveying raw materials; the sheet forming system is connected with the feeding system and used for forming the weighed raw materials into sheets; the flattening and conveying system is connected with the sheet forming system and used for flattening and conveying the sheets; and the product forming system is connected with the flattening and conveying system, is provided with a cutting station and a plurality of plastic suction stations, and is used for cutting the sheets and forming the sheets into plastic products. Through the arrangement, compared with a traditional blow molding and injection molding production line, the production efficiency can be improved, meanwhile, the occupied area of equipment is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of plastic molding, and in particular to a plastic product molding and processing production line. Background Art

[0002] Plastic products have become an indispensable part of modern life due to their light weight, durability, easy processing and cost-effectiveness. With the wide application of plastic products in various fields, related technologies and processes have also made great progress. The current production methods of plastic products mainly include injection molding or blow molding. For example, logistics transfer pallets or similar products are often made of polypropylene (PP) and polyethylene (PE) through injection molding or blow molding.

[0003] However, the blow molding and injection molding molds of similar products are huge in size, high in manufacturing cost, and low in utilization rate. Each blow molding equipment or injection molding equipment can only be equipped with one set of production molds, which has low production efficiency, large floor space, high equipment cost, and high energy consumption. If production efficiency needs to be improved, multiple sets of blow molding or injection molding equipment are needed, but this will greatly increase equipment cost and labor cost.

[0004] Therefore, how to improve production efficiency while taking into account production costs is an important issue that needs to be solved urgently. Summary of the invention

[0005] The present invention provides a plastic product molding production line, which is used to solve the defect in the prior art that it is difficult to balance production efficiency and production cost, and can reduce production cost as much as possible while improving production efficiency.

[0006] The present invention provides a plastic product molding production line, comprising: Feeding system, used to weigh and convey raw materials; A sheet forming system, connected to the feeding system, for forming the weighed raw materials into sheets; A flattening and conveying system, connected with the sheet forming system, for flattening and conveying the sheet; The product forming system is connected with the flattening and conveying system. The product forming system is provided with a cutting station and a plurality of blistering stations for cutting and forming the sheet material into plastic products.

[0007] According to a plastic product molding production line provided by the present invention, the flattening and conveying system includes hot flattening and conveying equipment.

[0008] According to a plastic product forming production line provided by the present invention, the sheet forming system comprises: A screw extrusion module is connected to the feeding system and is used to melt, mix, react and extrude the weighed raw materials; The extrusion die is connected with the screw extrusion module and is used for forming the molten material extruded by the screw extrusion module into a sheet.

[0009] According to a plastic product molding production line provided by the present invention, the screw extrusion module includes an intermediate layer extrusion mechanism and a surface layer extrusion mechanism respectively connected to the feeding system; the intermediate layer extrusion mechanism and the surface layer extrusion mechanism are connected to the extrusion die through a melt distributor.

[0010] According to a plastic product molding production line provided by the present invention, the intermediate layer extrusion mechanism comprises a first screw extruder, a second screw extruder and a foaming agent injection device; The first screw extruder is connected to the feeding system, the inlet of the second screw extruder is connected to the outlet of the first screw extruder, and the outlet is connected to the melt distributor; the second screw extruder is provided with a foaming section, and the foaming agent injection device is connected to the foaming section.

[0011] According to a plastic product molding production line provided by the present invention, the surface layer extrusion mechanism comprises a third screw extruder, the inlet of the third screw extruder is connected to the feeding system, and the outlet is connected to the melt distributor.

[0012] According to a plastic product molding production line provided by the present invention, the first screw extruder is a twin-screw extruder, the second screw extruder is a single-screw extruder, and the third screw extruder is a twin-screw extruder.

[0013] A plastic product molding processing production line provided according to the present invention also includes a control system, which includes a temperature control module and a centralized control module; the temperature control module is used to adjust the working temperature of the equipment in each system, and the centralized control module is used to perform linkage control on the equipment in each system.

[0014] A plastic product molding and processing production line provided according to the present invention also includes a dehumidification and drying system arranged upstream of the feeding system; the dehumidification and drying system at least includes an auxiliary agent dehumidification and drying module, a nucleating agent dehumidification and drying module, a chain extender dehumidification and drying module, a return material dehumidification and drying module and a new material dehumidification and drying module.

[0015] According to a plastic product molding production line provided by the present invention, the product molding system is further provided with a trimming station located downstream of the blistering station, and a stacking station located downstream of the trimming station.

[0016] The plastic product molding processing production line provided by the present invention has raw materials that are weighed by a feeding system and then transported to a sheet molding system. The sheet molding system can mold the raw materials into sheets, and the sheets are pressed and flattened by a flattening and conveying system and then transported to a product molding system. The product molding system is provided with a cutting station and a plurality of blister molding stations. At the cutting station, the sheets are cut according to the required specifications of the products, and the cut sheets enter a plurality of blister molding stations respectively. Each blister molding station can be operated independently, so that the sheets on different blister molding stations can be blister molded at the same time. Compared with the blow molding and injection molding production lines in the related art, the production efficiency can be improved while reducing the floor space occupied by the equipment and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of a plastic product molding production line provided by an embodiment of the present invention.

[0019] Reference numerals: 10. Feeding system; 20. Sheet forming system; 200. Extrusion die; 210. First screw extruder; 211. Second screw extruder; 220. Third screw extruder; 30. Flattening and conveying system; 40. Product forming system; 400. Cutting station; 410. Vacuum forming station; 420. Trimming station; 430. Stacking station; 50. Dehumidification and drying system; 500. Auxiliary agent dehumidification and drying module; 510. Nucleating agent dehumidification and drying module; 520. Chain extender dehumidification and drying module; 530. Return material dehumidification and drying module; 540. New material dehumidification and drying module; 60. Control system; 600. Temperature control module; 610. Centralized control module. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In order to better understand the plastic product molding and processing production line provided by the embodiment of the present invention, its application background is first introduced. At present, the production method of plastic products mainly includes processes such as injection molding or blow molding. Taking logistics transfer pallets or similar products as examples, polypropylene (PP) and polyethylene (PE) are often used as materials for molding by injection molding or blow molding.

[0022] However, the blow molding and injection molding molds of similar products are huge in size, high in manufacturing cost, and low in utilization rate. Each blow molding equipment or injection molding equipment can only be equipped with one set of production molds, which has low production efficiency, large floor space, high equipment cost, and high energy consumption. If production efficiency needs to be improved, multiple sets of blow molding or injection molding equipment are needed, but this will greatly increase equipment cost and labor cost.

[0023] Therefore, how to reduce production costs as much as possible while improving production efficiency is an important issue that needs to be solved urgently.

[0024] In view of the above problems, an embodiment of the present invention provides a plastic product molding and processing production line, which can improve production efficiency while reducing production costs as much as possible.

[0025] Combine the following Figure 1 The present invention describes a plastic product molding production line.

[0026] Reference Figure 1 A plastic product molding production line comprises at least a feeding system 10, a sheet molding system 20, a flattening and conveying system 30 and a product molding system 40; wherein the feeding system 10 is suitable for weighing and transporting raw materials; the sheet molding system 20 is connected with the feeding system 10, and is used to mold the weighed raw materials into sheets; the flattening and conveying system 30 is connected with the sheet molding system 20, and is used to flatten and convey the sheets; the product molding system 40 is connected with the flattening and conveying system 30, and the product molding system 40 is provided with a cutting station 400 and a plurality of blistering stations 410, which are used to cut the sheets and mold them into plastic products.

[0027] In actual applications, the raw materials are weighed by the feeding system 10 and then transported to the sheet forming system 20. The sheet forming system 20 can form the raw materials into sheets. The sheets are pressurized and flattened by the flattening conveying system 30 and then transported to the product forming system 40. The product forming system 40 is provided with a cutting station 400 and a plurality of blister forming stations 410. At the cutting station 400, the sheets are cut according to the required specifications of the products. The cut sheets enter the plurality of blister forming stations 410 respectively. Each blister forming station 410 can be operated independently, so that the sheets on different blister forming stations 410 can be blister formed at the same time. Compared with traditional blow molding and injection molding production lines, it can improve production efficiency while reducing the floor space occupied by the equipment and reducing production costs.

[0028] In one embodiment of the present invention, the feeding system 10 can adopt an existing central feeding system 10, such as the CJ-ZY series, SWITEK series, etc. Its specific model and specifications can be flexibly configured according to actual needs such as production scale, etc., and no specific restrictions are made in the embodiment of the present invention.

[0029] Generally speaking, the feeding system 10 is provided with a raw material storage device, a conveying device and a metering device; wherein, the raw material storage device is used to store raw materials to avoid production interruptions due to raw material shortages, and common raw material storage devices include silos, storage tanks, etc.; the conveying device is used to transport the raw materials from the storage device to the production equipment or processing area, and common ones include belt conveyors, screw conveyors, pneumatic conveying systems, etc.; and the metering device can accurately measure the supply of various raw materials, and common ones include weighing sensors, flow meters, etc.

[0030] It should be pointed out here that the above is only a brief description of the structure and working principle of the feeding system 10, and its purpose is to make it easier to understand the working process and function of the feeding system 10. Of course, the feeding system 10 may also include other structures or equipment. The embodiment of the present invention does not make changes to the structure and working principle of the feeding system 10. Its more specific structure can refer to the prior art and will not be repeated in the embodiment of the present invention.

[0031] In order to prevent moisture in the raw materials from adversely affecting the quality of plastic products, in one embodiment of the present invention, the plastic product molding and processing production line further includes a dehumidification and drying system 50, which is used to dehumidify and dry the raw materials.

[0032] Depending on the type of raw materials, the dehumidification and drying system 50 can also be equipped with multiple dehumidification modules for separately dehumidifying and drying different raw materials. In one embodiment of the present invention, the raw materials include main materials (such as PET) and auxiliary materials (such as nucleating agents, chain extenders, and modifying agents). Therefore, the dehumidification and drying system 50 includes at least an auxiliary agent dehumidification and drying module 500, a nucleating agent dehumidification and drying module 510, a chain extender dehumidification and drying module 520, a recycled material dehumidification and drying module 530, and a new material dehumidification and drying module 540.

[0033] Generally speaking, each dehumidification and drying module includes a feeding part, a dehumidification and drying part and a discharging part; wherein the feeding part is used to transport the raw materials from the barrel or other storage container to the dehumidification and drying part, and a vacuum conveyor can be used specifically. The dehumidification and drying part is used to dehumidify and dry the materials. Based on different working principles and working forms, there are many types of dehumidification and drying parts to choose from, such as adsorption dehumidifiers, refrigeration dehumidifiers, rotary dehumidifiers, vacuum drying systems, hot air circulation drying boxes, etc., which can be flexibly selected according to different needs. Sometimes different types of dehumidifiers can be used in combination to improve the dehumidification and drying effect. The discharging part is mainly used to transport the dried materials to the feeding system 10. In order to avoid the re-humidification of the dried materials in contact with the external wet air and to ensure the conveying efficiency, a vacuum conveyor can be used for the discharging part.

[0034] Similarly, the above is only a brief description of the structure and working principle of the dehumidification and drying module. Its purpose is to more conveniently explain the working process and function of the dehumidification and drying module. Of course, the dehumidification and drying module may also include other structures or equipment. The structure and working principle of the dehumidification and drying module are not changed in the embodiment of the present invention. Its more specific structure can refer to the prior art and will not be repeated in the embodiment of the present invention.

[0035] Different raw materials are dehumidified and dried by the dehumidification and drying module and then transported to the feeding system 10. The feeding system 10 can accurately weigh various raw materials and then transport them to the sheet forming system 20 for sheet forming. In one embodiment of the present invention, the sheet forming system 20 includes a screw extrusion module and an extrusion die 200; wherein the screw extrusion module is connected to the feeding system 10 to melt, mix, react and extrude the weighed raw materials; the extrusion die 200 is connected to the screw extrusion module to form the molten material extruded by the screw extrusion module into a sheet.

[0036] The structure or form of the screw extrusion module and the extrusion die 200 can be flexibly selected according to different production requirements, such as the shape, size, performance requirements and other factors of the sheet, to ensure that the produced sheet meets the required specifications and performance standards.

[0037] In one embodiment of the present invention, the screw extrusion module includes an intermediate layer extrusion mechanism and a surface layer extrusion mechanism respectively connected to the feeding system 10; wherein the intermediate layer extrusion mechanism and the surface layer extrusion mechanism are connected to the basic mold through a melt distributor.

[0038] Specifically, various raw materials including main materials (such as PET) and auxiliary materials (such as nucleating agents, chain extenders, and modifying aids) are accurately weighed by the feeding system 10 and then transported to the middle layer extrusion mechanism and the surface layer extrusion mechanism respectively. The middle layer extrusion mechanism is used to extrude the middle layer melt, and the surface layer extrusion mechanism is used to extrude the surface layer melt. The middle layer melt and the surface layer melt enter the extrusion die 200 after passing through the melt distributor. The surface layer melt wraps the middle layer melt and is extruded through the opening of the extrusion die 200 together to form a multi-layer co-extruded sheet.

[0039] It should be pointed out here that the melt distributor is a device for diverting and distributing the melt flow of thermoplastic plastics, which can be connected to multiple extruders and evenly distribute the melt flow into multiple layers, thereby manufacturing a multi-layer preform. The specific structure and working principle of the melt distributor can refer to the prior art. The specific structure and working principle of the melt distributor are not changed in the embodiment of the present invention. Therefore, the specific structure of the melt distributor is not described in detail in the embodiment of the present invention. In addition, the model, specification parameters, etc. of the melt distributor can be flexibly selected according to different actual needs, such as the number of layers, specifications and performance standards of the sheet, and no specific restrictions are made in the embodiment of the present invention.

[0040] In one embodiment of the present invention, the middle layer extrusion module includes a first screw extruder 210, a second screw extruder 211 and a foaming agent injection device; wherein, the feed port of the first screw extruder 210 is connected to the feeding system 10, the outlet is connected to the inlet of the second screw extruder 211, and the outlet of the second screw extruder 211 is connected to the melt distributor; the second screw extruder 211 is provided with a foaming section, and the foaming agent injection device is connected to the foaming section.

[0041] Specifically, various raw materials including main materials (such as PET) and auxiliary materials (such as nucleating agents, chain extenders, and modifying agents) are precisely weighed by the feeding system 10 and then transported to the first screw extruder 210. The raw materials are melted, mixed, and reacted in the first screw extruder 210 to reach a specified melt strength and then input into the second screw extruder 211. In the foaming section, the melt is fully mixed with the foaming agent injected by the foaming agent injection device to generate an intermediate layer melt, and the intermediate layer melt is extruded through the second screw extruder 211.

[0042] Specifically, the first screw extruder 210 and the second screw extruder 211 are connected by a melt pump, and the raw material is melted in the first screw extruder 210 and then transported to the second screw extruder 211 through the melt pump.

[0043] Specifically, the first screw extruder 210 may be a twin-screw extruder, and the second screw extruder 211 may be a twin-screw extruder.

[0044] Specifically, the foaming agent may be supercritical carbon dioxide or an alkane foaming agent.

[0045] In one embodiment of the present invention, the surface layer extrusion mechanism includes a third screw extruder 220. The raw materials are precisely weighed by the feeding system 10 and then transported to the third screw extruder 220. The raw materials are melted, mixed, and reacted in the third screw extruder 220 to reach a specified melt strength to form a surface layer melt.

[0046] Specifically, the third screw extruder 220 may be a twin-screw extruder.

[0047] It should be noted that the specific models and specifications of the first screw extruder 210 , the second screw extruder 211 , and the third screw extruder 220 can be selected according to actual needs such as capacity design, and are not specifically limited in the embodiments of the present invention.

[0048] Through the above technical scheme, the middle layer extrusion mechanism can extrude the foaming middle layer melt, and the surface layer extrusion mechanism can extrude the surface layer melt. The foaming middle layer melt starts to foam at the extrusion die 200 after passing through the melt distributor. After the surface layer melt passes through the melt distributor, the foaming layer melt is wrapped up and down and then extruded through the opening of the extrusion die 200 together with the foaming layer middle melt to form a three-layer co-extruded foam sheet. Plastic products formed using the above sheet can greatly improve the weight-bearing ratio of the plastic products.

[0049] The specific model and specification of the extrusion die 200 can be selected according to actual needs. As a specific embodiment of the present invention, the extrusion die 200 adopts a hanger-type die. The effective width range of the hanger-type die is 900-1800mm, the opening thickness is 2-6mm, and the hanger-type die is arranged downward at an angle of 15°, which is convenient for delivering the three-layer co-extruded sheet under cast to the sheet flattening conveying system 30.

[0050] It should be pointed out here that the hanger-type mold is a mold structure commonly used in the production of extruded plates (sheets). Its specific structure and working principle can refer to the prior art and will not be described in detail in the embodiments of the present invention.

[0051] It is understandable that the extrusion die 200 includes but is not limited to the structural forms listed above, and other structural forms of the extrusion die 200 are applicable as long as they can achieve the molding of the sheet.

[0052] In one embodiment of the present invention, the flattening conveying system 30 uses a hot flattening conveying device. After the three-layer co-extruded sheet under cast film is sent to the hot flattening conveying device, it is flattened by the hot flattening conveying device and then sent to the product forming system 40.

[0053] In this way, the three-roll calendering equipment on the original three-layer co-extrusion equipment is replaced by the hot pressing flat conveying equipment, so that the sheet material is always kept above the crystallization temperature during the conveying process, thereby realizing the process of direct vacuum forming above the crystallization temperature of the material (such as PET), avoiding the process of traditional plastic products that requires the cooled sheet material to be sent to the vacuum forming machine for reheating, thereby avoiding the crystallization embrittlement that is easy to occur in the production and processing process of the material, and improving the molding rate of the material and the yield rate of the product.

[0054] Generally speaking, hot pressing and flattening conveying equipment generally includes a polytetrafluoroethylene conveyor belt, a herringbone pressure roller, a heater, a frame, a heat preservation cover, etc. The polytetrafluoroethylene conveyor belt transmits the temperature of the heater to the sheet and can also ensure that the sheet does not stick together. The herringbone pressure roller is used to apply oblique pressure to the sheet and flatten it, thereby improving the transverse and longitudinal tensile strength of the sheet.

[0055] It should be pointed out here that the above is only a brief description of the structure and principle of the hot pressing flat conveying equipment, and its purpose is to make it easier to understand the working process and function of the hot pressing flat conveying equipment. Of course, the hot pressing flat conveying equipment can also include other structures. The structure and working principle of the hot pressing flat conveying equipment are not changed in the embodiment of the present invention. Its more specific structure can refer to the prior art, and will not be described in detail in the embodiment of the present invention. In addition, the model, specification parameters, etc. of the hot pressing flat conveying equipment can be flexibly selected according to different actual needs, and no specific restrictions are made in the embodiment of the present invention.

[0056] In one embodiment of the present invention, the product forming system 40 is provided with a cutting station 400 and a plurality of blister forming stations 410; wherein, a cross-cutting machine is provided at the cutting station 400 for cutting the sheet material according to the required specifications of the product; a blister forming mold is provided on each blister forming station 410, and the cut sheet material is sent to the blister forming mold for blister forming after the four sides are fixed.

[0057] The specific structure and working principle of the cross-cutting machine and the blister mold can refer to the prior art, and will not be described in detail in the embodiments of the present invention. The specific models and specifications of the cross-cutting machine and the blister mold can be selected according to the actual needs of the product, and will not be specifically limited in the embodiments of the present invention.

[0058] Specifically, at least two blister stations 410 are provided, and the blister molds on the two blister stations 410 can work together, and each time a mold is installed, it moves to the next station to wait for blister molding, and the other set is on standby. When the extrusion speed is increased, three or more blister stations 410 can be installed to adapt to the production capacity requirements.

[0059] In one embodiment of the present invention, the product forming system 40 is further provided with a trimming station 420 and a stacking station 430; wherein the trimming station 420 is located downstream of the blister forming station 410, and is provided with a trimming machine, which can specifically be a laser trimming machine, and the laser trimming machine is used to remove burrs from the plastic product after demolding; the stacking station 430 is located downstream of the trimming station 420, and is provided with a stacking robot device, which can specifically be a suction cup stacking robot device, and the suction cup stacking robot device is used to stack the plastic products after the burrs are removed.

[0060] In one embodiment of the present invention, the plastic product molding processing production line also includes a control system 60, the control system 60; the control system 60 includes a temperature control module 600 and a centralized control module 610; wherein the temperature control module 600 is used to adjust the working temperature of the equipment in each system, and the centralized control module 610 is used to perform linkage control on the equipment in each system, including but not limited to the feeding system 10, the conveying speed of the hot pressing flat conveying equipment, the cross-cutting machine speed, the blister machine mold conversion speed, and the linkage control of the trimming machine and the stacking robot after demolding.

[0061] Specifically, the temperature control module 600 can use the PID feedback mechanism to achieve precise temperature adjustment based on the proportional control algorithm, the integral control algorithm and the differential control algorithm.

[0062] As a specific embodiment of the present invention, the temperature control module 600 can accurately control the heating zones of each screw (260-280°C), the temperature of each flow channel in the extrusion mold 200 (200-240°C), the temperature of the flattening conveying equipment (180-220°C), and the temperature of the blister mold (heating to 180-200°C before blistering and cooling to 40-60°C after blistering).

[0063] It is to be understood that, without mutual contradiction, those skilled in the art may combine and combine the different embodiments or examples and the features of the different embodiments or examples described in this specification.

[0064] Through the plastic product molding processing production line provided by the embodiment of the present invention, the raw materials are weighed by the feeding system 10 and then conveyed to the sheet molding system 20. The sheet molding system 20 can mold the raw materials into sheets. The sheets are pressed and flattened by the flattening conveying system 30 and then conveyed to the product molding system 40. The product molding system 40 is provided with a cutting station 400 and a plurality of blistering stations 410. At the cutting station 400, the sheets are cut according to the required specifications of the products. The cut sheets enter the plurality of blistering stations 410 respectively. Each blistering station 410 can be operated independently, so that the sheets on different blistering stations 410 can be blister molded at the same time. Compared with the blow molding and injection molding production lines in the related art, it can improve the production efficiency while reducing the floor space occupied by the equipment and reducing the production cost.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A plastic product molding production line, characterized in that: include: A feeding system (10) for weighing and conveying raw materials; A sheet forming system (20), connected to the feeding system (10), is used to form the weighed raw materials into sheets; A flattening and conveying system (30), connected to the sheet forming system (20), for flattening and conveying the sheet; The product forming system (40) is connected to the flattening and conveying system (30). The product forming system (40) is provided with a cutting station (400) and a plurality of blistering stations (410) for cutting and forming the sheet material into plastic products.

2. The plastic product molding production line according to claim 1, characterized in that: The flattening conveying system (30) includes a hot flattening conveying device.

3. The plastic product molding production line according to claim 1, characterized in that: The sheet forming system (20) comprises: A screw extrusion module is connected to the feeding system (10) and is used to melt, mix, react and extrude the weighed raw materials; The extrusion die (200) is connected to the screw extrusion module and is used to shape the molten material extruded by the screw extrusion module into a sheet.

4. The plastic product molding production line according to claim 3, characterized in that: The screw extrusion module comprises an intermediate layer extrusion mechanism and a surface layer extrusion mechanism respectively connected to the feeding system (10); the intermediate layer extrusion mechanism and the surface layer extrusion mechanism are connected to the extrusion die (200) via a melt distributor.

5. The plastic product molding production line according to claim 4, characterized in that: The intermediate layer extrusion mechanism comprises a first screw extruder (210), a second screw extruder (211) and a foaming agent injection device; The first screw extruder (210) is connected to the feeding system (10), the inlet of the second screw extruder (211) is connected to the outlet of the first screw extruder (210), and the outlet is connected to the melt distributor; the second screw extruder (211) is provided with a foaming section, and the foaming agent injection device is connected to the foaming section.

6. The plastic product molding production line according to claim 5, characterized in that: The surface layer extrusion mechanism comprises a third screw extruder (220), the inlet of the third screw extruder (220) is connected to the feeding system (10), and the outlet is connected to the melt distributor.

7. The plastic product molding production line according to claim 6, characterized in that: The first screw extruder (210) is a twin-screw extruder, the second screw extruder (211) is a single-screw extruder, and the third screw extruder (220) is a twin-screw extruder.

8. The plastic product molding production line according to any one of claims 1 to 7, characterized in that: It also includes a control system (60), the control system (60) including a temperature control module (600) and a centralized control module (610); the temperature control module (600) is used to adjust the operating temperature of the equipment in each system, and the centralized control module (610) is used to perform linkage control on the equipment in each system.

9. The plastic product molding production line according to claim 1, characterized in that: It also includes a dehumidification and drying system (50) arranged upstream of the feeding system (10); the dehumidification and drying system (50) includes at least an auxiliary agent dehumidification and drying module (500), a nucleating agent dehumidification and drying module (510), a chain extender dehumidification and drying module (520), a recycled material dehumidification and drying module (530) and a new material dehumidification and drying module (540).

10. The plastic product molding production line according to claim 1, characterized in that: The product forming system (40) is further provided with a trimming station (420) located downstream of the blistering station (410), and a stacking station (430) located downstream of the trimming station (420).

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