Foaming system and process for producing epp foamed particles from epp recycled pieces

Abstract

The application provides a foaming system and process for manufacturing EPP foaming particles from EPP recycled parts, which is applied to the field of foam plastic recycling. The vacuum chamber is arranged outside the die head, and the inside of the vacuum chamber is in a relatively sealed state. The vacuum inside the vacuum chamber is pumped by a vacuum pump to form a negative pressure state. When the plastic extruder is used for fine wire extrusion molding, the screw rotates in the extrusion cylinder to apply extrusion pressure to the fine wire extrusion. The vacuum chamber is pumped by the pipeline to apply pulling force to the fine wire extrusion from the outside. The two cooperate with each other to ensure that the fine wire is more smoothly extruded from the extrusion hole. To a certain extent, the speed of the fine wire extrusion is reduced, the extrusion hole is prevented from being blocked, and the efficiency of the fine wire extrusion molding in the EPP recycling process is improved.

Description

Technical Field

[0001] This application relates to the field of foamed plastic recycling, and in particular to a foaming system and process for producing EPP foamed granules using recycled EPP parts. Background Technology

[0002] EPP products are made from polypropylene foam resin. It is a type of foam plastic, a high-tech and environmentally friendly foam material with excellent properties such as high strength, high resilience, impact resistance, corrosion resistance, and resistance to breakage. It is widely used in various fields of production and daily life. The wide range of applications of EPP products results in a large amount of EPP waste and recyclable parts being generated in daily production and daily life. In order to avoid waste of resources and pollution, EPP waste and recyclable parts are usually recycled and reused. The recycling process requires multiple hot melt extrusion operations on the waste material.

[0003] During the processing of EPP recycled parts, multiple hot melt extrusion operations are required. Especially during plasticizing extrusion, micron-level fine filaments need to be extruded. The extrusion diameter of the corresponding die head is set to 0.2-0.3mm. Due to the small diameter of the extrusion orifice, not only will the extrusion speed be low, but the extrusion orifice may also be blocked, affecting the efficiency of hot melt extrusion of EPP recycled parts. Summary of the Invention

[0004] The purpose of this application is to improve the extrusion efficiency and stability of micron-sized filaments during EPP recycling. Compared with existing technologies, it provides a foaming system and process for producing EPP foamed granules using recycled EPP parts, including a pretreatment section, a reshaping section, a reaction section, and a post-treatment section. The reshaping section includes a mixer, a plastic extruder, and a millimeter-level pelletizer. The plastic extruder includes a main unit, and a horizontally arranged extrusion cylinder is fixedly installed on the top of the main unit. A screw is rotatably installed inside the extrusion cylinder, and a die is fixedly installed at the extrusion port of the screw. The die has numerous parallel extrusion holes inside. A vacuum chamber wrapped around the outside of the die is fixedly installed on the outer end wall of the extrusion cylinder. A vacuum pump connected to the inside of the vacuum chamber is fixedly installed on the top of the main unit. The inner diameter of a single extrusion hole is set to 0.3 mm.

[0005] Furthermore, an electromagnetic slide rail is fixedly installed on the inner end wall of the vacuum chamber, which is on the same straight line as the extrusion cylinder, and an electromagnetic slide block is slidably installed inside the electromagnetic slide rail. An electromagnetic clamp is fixedly installed on the electromagnetic slide block, which is on the same horizontal plane as the numerous extrusion holes.

[0006] Furthermore, an electromagnetic slide block 2 is slidably installed inside the electromagnetic slide rail on the other side of the electromagnetic slide block 1, and an electromagnetic clamp 2 located on the same plane as the electromagnetic clamp 1 is fixedly installed on the electromagnetic slide block 2.

[0007] Furthermore, an electric cutting blade is fixedly installed on the inner end wall of the vacuum chamber, which is located on the upper and lower sides of the electromagnetic slide rail. The electric cutting blade is located on the side close to the mold head and 5cm away from it.

[0008] Furthermore, a cooling unit is fixedly installed on the inner wall of the vacuum chamber, covering the electromagnetic slide rail, and the temperature of the cooling unit gradually decreases from the side closer to the mold head to the side farther away from the mold head.

[0009] Furthermore, a transfer chamber is fixedly connected to the bottom of the vacuum chamber, and valve chambers are fixedly installed on both the upper and lower sides of the transfer chamber. A valve plate is slidably installed inside the valve chamber and seals the port of the transfer chamber. A threaded rod is rotatably installed inside the valve chamber and is parallel to the sliding direction of the valve plate. The threaded rod passes through the valve plate. A servo motor is fixedly installed on the outer end wall of the valve chamber, and the drive shaft of the servo motor is fixedly connected to the threaded rod.

[0010] Furthermore, each valve chamber contains two threaded rods that are rotatably installed. The two threaded rods are respectively located at opposite ends of the same valve plate, and the two threaded rods in the same valve chamber are connected by a transmission belt located outside the valve chamber.

[0011] Furthermore, a pipe is fixedly connected to the end wall of the vacuum chamber and to the air extraction port of the vacuum pump, and a pipe is also fixedly connected to the end wall of the transfer chamber and to the air extraction port of the vacuum pump. A solenoid valve is fixedly installed inside the pipe connected to the transfer chamber.

[0012] Furthermore, the bottom of the transfer compartment is fixedly connected to the discharge compartment located above the main unit, and the top of the main unit is also fixedly installed with a support that runs through the bottom of the discharge compartment. The two ends of the support are symmetrically rotated with conveyor rollers located outside the discharge compartment. The outer sides of the two conveyor rollers are fitted with a conveyor belt that passes through the bottom of the discharge compartment. The top of the main unit is fixedly installed with a servo motor that drives the conveyor rollers.

[0013] This invention also provides a process for producing EPP foamed granules using recycled EPP components, the process comprising the following steps:

[0014] ① After the plastic granules enter the extrusion cylinder, they are conveyed under the continuous rotation of the screw and melted by heat during the conveying process;

[0015] ② The screw rotates continuously to apply pressure to the molten plastic granules, causing them to be extruded outward from the extrusion hole on the die head. Simultaneously, the pipeline is powered on to draw the vacuum chamber into a negative pressure state, pulling the fine filaments formed in the extrusion hole from the outside.

[0016] ③ During the filament extrusion molding process, electromagnetic clamp one grabs the end of the filament and moves away from the die head under the drive of electromagnetic slide one. During this process, electromagnetic clamp two simultaneously grabs the end of the filament and electromagnetic slide two drives electromagnetic clamp two to move in the same direction as electromagnetic slide two.

[0017] ④ When pulled to the middle position of the electromagnetic slide rail, the second electromagnetic slide block drives the second electromagnetic clamp to continue to grab the end of the filament and move away from the die head, while the first electromagnetic clamp releases its grip on the filament and returns to the initial position under the drive of the first electromagnetic slide block.

[0018] ⑤ When the electromagnetic clamp moves away from the die head to the limit position on the electromagnetic slide rail, it releases the grip on the filament and moves back to the die head to reset. Simultaneously, the electric cutting blade is powered on and starts to cut the filament.

[0019] ⑥ Repeat steps ③-⑤ above, and the extruded filaments continue to accumulate at the bottom of the vacuum chamber;

[0020] ⑦ The valve plate in the valve chamber above the transfer chamber is driven to open, and the fine wires accumulated at the bottom of the vacuum chamber fall into the transfer chamber. Then, the upper valve plate closes again, the lower valve plate opens, and the fine wires fall onto the conveyor belt at the bottom of the discharge chamber. The lower valve plate closes again, and the fine wires that have fallen onto the conveyor belt are output outward.

[0021] Compared to existing technologies, the advantages of this application are:

[0022] (1) This application sets the vacuum chamber cover on the outside of the die head and sets the inside of the vacuum chamber in a relatively sealed state. With the help of a vacuum pump, the vacuum chamber is evacuated and vacuumed, so that the inside of the vacuum chamber is in a negative pressure state. When the plastic extruder is used for filament extrusion molding, the screw rotates in the extrusion cylinder to apply pressure to the filament extrusion. The vacuum chamber is evacuated by the pipeline and applies a pulling force to the filament extrusion from the outside. The two work together to ensure that the filament is extruded more smoothly from the extrusion hole, which reduces the speed of filament extrusion to a certain extent and can avoid the blockage of the extrusion hole, which is conducive to improving the efficiency of filament extrusion molding in the EPP recycling process.

[0023] (2) By installing the electromagnetic slide rail on the inner end wall of the vacuum chamber and fixing the electromagnetic clamp that can be used to grab the filament on the electromagnetic slide seat that is slidably installed inside the electromagnetic slide rail, the filament can be simultaneously tractioned during the filament extrusion process. This is beneficial to further refine the diameter of the filament after extrusion, and to more conveniently obtain millimeter-level filaments, thereby improving the filament extrusion molding efficiency to a certain extent.

[0024] (3) By setting up electromagnetic slide one and electromagnetic slide two that can move independently on the electromagnetic slide rail, and fixing electromagnetic clamp one and electromagnetic clamp two on electromagnetic slide one and electromagnetic slide two respectively, the extruded filaments are gripped and work together to achieve continuous traction of the extruded filaments, which is conducive to ensuring the continuous uniformity of the filaments being stretched and refined, and improves the work efficiency and work stability to a certain extent.

[0025] (4) By setting the electric cutter on the inner end wall of the vacuum chamber, the extruded filaments are quantitatively cut, which helps to ensure that the extruded filaments can fall stably to the bottom of the vacuum chamber in segments, avoiding the filaments from becoming messy after forming, and ensuring the convenience of subsequent pelletizing by the micron-level pelletizer. At the same time, by setting the electric cutter 5cm away from the die head, the electromagnetic clamp moves closer to the die head and resets to be between the die head and the electric cutter, which helps to ensure the continuous stability of the extruded filaments being gripped by the electromagnetic clamp.

[0026] (5) By installing the cooling unit inside the vacuum chamber, the temperature inside the vacuum chamber is actively reduced, which helps to shorten the curing time after the filament is formed, thereby effectively improving the processing efficiency. At the same time, by setting the position of the cooling unit to be lowered step by step from left to right, the filament is actively cooled and cured in sequence, avoiding the filament from being instantly cooled and cured when it is extruded from the extrusion hole, which helps to ensure the stability of the filament being drawn and refined after extrusion.

[0027] (6) By connecting the transfer chamber to the bottom of the vacuum chamber and installing the valve plate inside the valve chamber fixed at both ends of the transfer chamber, the fine wire inside the vacuum chamber can be smoothly discharged by controlling the opening and closing of the two valve plates one by one, and the negative pressure state inside the vacuum chamber can be stabilized to a great extent, which is conducive to ensuring the stability of the system during operation.

[0028] (7) Connecting the transfer chamber to the vacuum pump through another pipe allows for vacuuming of the transfer chamber before the upper valve plate is opened, which helps to further reduce the impact of the connection of the transfer chamber to the vacuum chamber on the negative pressure state inside the vacuum chamber after the upper valve plate is opened. Attached Figure Description

[0029] Figure 1 This is a three-dimensional view of the overall structure of this application;

[0030] Figure 2 This is a top view of the overall structure of this application;

[0031] Figure 3 This is a front sectional view of the overall structure of this application;

[0032] Figure 4 for Figure 3 Schematic diagram of the structure at point A;

[0033] Figure 5 for Figure 3 Schematic diagram of the structure at point B;

[0034] Figure 6 This is a three-dimensional view of the internal structure of the vacuum chamber in this application;

[0035] Figure 7 This is a three-dimensional structural view of the transfer compartment and valve compartment in this application;

[0036] Figure 8 This is a perspective view of the internal structure of the valve chamber in this application;

[0037] Figure 9 This is an exploded view of the conveyor roller and conveyor belt of this application;

[0038] Figure 10 This is a flowchart of the fine filament extrusion process of this application.

[0039] Explanation of the labels in the diagram:

[0040] 1. Main unit; 101. Extrusion cylinder; 102. Screw; 103. Die head; 104. Extrusion orifice; 2. Vacuum chamber; 201. Electromagnetic slide rail; 202. Electromagnetic slide block one; 203. Electromagnetic clamp one; 204. Electromagnetic slide block two; 205. Electromagnetic clamp two; 206. Electric cutting blade; 207. Refrigeration unit; 3. Vacuum pump; 301. Pipeline; 4. Transfer chamber; 5. Valve chamber; 501. Valve plate; 502. Threaded rod; 503. Servo motor one; 504. Transmission belt; 6. Discharge chamber; 601. Support; 602. Conveyor roller; 603. Conveyor belt; 604. Servo motor two. Detailed Implementation

[0041] The embodiments will be described clearly and completely with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application.

[0042] Example 1:

[0043] This invention provides a foaming system for producing EPP foamed granules using recycled EPP components. Please refer to [link to relevant documentation]. Figure 1 - Figure 10The system includes a pretreatment section, a reshaping section, a reaction section, and a post-processing section. In the pretreatment section, recycled EPP waste products are sorted and screened by color and then further recycled according to their color. The pretreatment section includes a crusher that crushes EPP waste products of the same color into granules. The pretreatment section is also equipped with an extrusion granulator that feeds the crushed EPP waste product granules of the same color into the extrusion granulator. The granules are heated and melted in the extrusion granulator, and then cooled and shaped after extrusion to obtain recycled PP material.

[0044] The remolding section includes a mixer, a plastic extruder, and a millimeter-scale pelletizer. The recycled PP material obtained after pretreatment is mixed with virgin PP material and additives in a certain proportion in the mixer for highly uniform mixing. The mixed plastic pellets are then fed into the plastic extruder, heated and melted, and then extruded again to form millimeter-scale filaments. The filaments are then pelletized by the millimeter-scale pelletizer to form millimeter-scale microparticles.

[0045] The reaction section includes a reaction vessel. The microparticles, which are reshaped by the reshaping section, are mixed with water, dispersant, and nucleating agent in a certain proportion and added to the reaction vessel. The mixture is stirred and heated in the reaction vessel, and carbon dioxide gas is subsequently injected as a foaming agent. After saturation, the gas is released to form foamed microparticles. The foamed microparticles are then washed with cooling water, dehydrated, dispersed, dried, and screened in the post-processing section. After 24 hours of curing, the EPP microparticles are obtained as the finished product.

[0046] The plastic extruder includes a main unit 1, and a horizontally arranged extrusion cylinder 101 is fixedly installed on the top of the main unit 1. A screw 102 is rotatably installed inside the extrusion cylinder 101, and a die head 103 is fixedly installed at the extrusion port of the screw 102. A plurality of extrusion holes 104 arranged side by side are opened inside the die head 103. A vacuum chamber 2 is fixedly installed on the outer end wall of the extrusion cylinder 101 and wraps around the outside of the die head 103. A vacuum pump 3 connected to the inside of the vacuum chamber 2 is fixedly installed on the top of the main unit 1. The inner diameter of a single extrusion hole 104 is set to 0.3 mm.

[0047] When the foaming system is running, the staff connects the system to an external power source, which provides power to the system and enables the various components within the system to start. During the operation of the foaming system, the plastic granules fed into the extrusion cylinder 101 are heated to a molten state by the heating unit on the extrusion cylinder 101. The screw 102, which is rotatably installed inside the extrusion cylinder 101, is driven to rotate by the drive unit on the main unit 1. Through the spiral conveying force generated during the rotation of the screw 102, the molten plastic granules are squeezed towards the die head 103 and extruded from the extrusion hole 104.

[0048] During this process, the vacuum pump 3 is powered on and starts to perform a vacuuming operation in the relatively sealed vacuum chamber 2, so that the inside of the vacuum chamber 2 is in a negative pressure state. Since the extrusion hole 104 is directly connected to the vacuum chamber 2, under the action of air pressure, the extrusion of the filament in the extrusion hole 104 can be externally pulled. The screw 102 rotates in the extrusion cylinder 101 to apply extrusion pressure to the filament. The vacuum chamber 2 is evacuated by the pipe 301, and the extrusion of the filament is pulled from the outside. The two work together to ensure that the filament is extruded more smoothly from the extrusion hole 104.

[0049] Please see Figure 3 , Figure 4 and Figure 6 An electromagnetic slide rail 201, which is aligned with the extrusion cylinder 101, is fixedly installed on the inner wall of the vacuum chamber 2. An electromagnetic slide block 202 is slidably installed inside the electromagnetic slide rail 201. An electromagnetic clamp 203, which is aligned with the extrusion holes 104, is fixedly installed on the electromagnetic slide block 202. During the operation of the foaming system, when the filament is extruded from the extrusion holes 104, the electromagnetic clamp 203 can grasp and hold the end of the filament. During the extrusion process, the electromagnetic slide block 202 drives the electromagnetic clamp 203 to move along the electromagnetic slide rail 201 away from the die head 103. This process is carried out in conjunction with the extrusion of the filament. The pulling force of the electromagnetic clamp 203 applies a tensile force to the extruded filament, which is beneficial for further refining the diameter of the filament after extrusion. In this mode, the inner diameter of the extrusion holes 104 can be appropriately increased, further reducing the probability of blockage caused by the small inner diameter of the extrusion holes 104 during the filament extrusion process.

[0050] Please see Figure 6 An electromagnetic slide block 204 is slidably installed inside the electromagnetic slide rail 201 on the other side of the electromagnetic slide block 202. An electromagnetic clamp 205, which is located on the same plane as the electromagnetic clamp 203, is fixedly installed on the electromagnetic slide block 204. During the operation of the system, the electromagnetic clamp 203 grabs the extruded filament and moves it away from the die head 103, pulling it during the filament extrusion process. The electromagnetic clamp 205 is close to the electromagnetic clamp 203 and simultaneously grabs the filament. The electromagnetic slide block 204, which is fixed to the electromagnetic clamp 205, moves synchronously and in the same direction as the electromagnetic slide block 202. When it is pulled to the middle position of the electromagnetic slide rail 201, the electromagnetic slide block 204 drives the electromagnetic clamp 205 to grab the filament and continue to pull it away from the die head 103. The electromagnetic clamp 203 then releases its grip on the filament and moves back to the die head 103 under the drive of the electromagnetic slide block 202.

[0051] When the electromagnetic clamp 203 moves to its initial position under the drive of the electromagnetic slide 202, the electromagnetic clamp 205, driven by the electromagnetic slide 204, pulls the filament to the far right inside the vacuum chamber 2. At this time, the electromagnetic clamp 203 continues to grip the filament and move away from the die head 103, while the electromagnetic clamp 205 releases its grip on the filament and moves towards the die head 103. When the electromagnetic clamp 205 gets close to the electromagnetic clamp 203, it grips the filament again and moves away from the die head 103 in sync with the electromagnetic clamp 203. The above operation is repeated to apply traction force to the extruded filament and perform stretching and refining operations.

[0052] Please see Figure 4 An electric cutting blade 206 is fixedly installed on the inner wall of the vacuum chamber 2, positioned on the upper and lower sides of the electromagnetic slide rail 201. The electric cutting blade 206 is located on the side closest to the die head 103 and 5cm away from it. During system operation, when the electromagnetic clamp 203 moves and resets towards the die head 103 under the drive of the electromagnetic slide block 202, the electric cutting blade 206 installed inside the vacuum chamber 2 can be powered on to cut the filament. The cutting of the filament by 206 and the traction of the filament by electromagnetic clamp 1 203 and electromagnetic clamp 205 work together to ensure that the extruded and refined filaments fall into the bottom of the vacuum chamber 2 in segments and are neatly arranged. There is a 5cm gap between the electric cutter 206 and the die head 103, so that after the electromagnetic clamp 1 203 moves and resets towards the die head 103, it can be located between the die head 103 and the electric cutter 206, ensuring the convenience of the electromagnetic clamp 1 203 in grasping the extruded filaments.

[0053] Please see Figure 3 and Figure 4 A cooling unit 207 is fixedly installed on the inner wall of the vacuum chamber 2, covering the electromagnetic slide rail 201. The temperature of the cooling unit 207 gradually decreases from the side closer to the die head 103 to the side farther away from the die head 103. During the operation of the system, the cooling unit 207 is powered on and actively cools inside the vacuum chamber 2. By actively applying cooling, the efficiency of filament shaping can be accelerated. In this application, since the temperature on the cooling unit 207 decreases from left to right, the temperature of the filament gradually decreases when it is extruded and pulled to the right. This helps to avoid the filament being suddenly pre-cooled and solidified after being extruded, thus ensuring the stability of its stretching and refining.

[0054] Please see Figure 5 , Figure 7 and Figure 8Vacuum chamber 2 is fixedly connected to transfer chamber 4 at its bottom, and valve chambers 5 are fixedly installed on both the upper and lower sides of transfer chamber 4. Valve plate 501 is slidably installed inside valve chamber 5 and seals the port of transfer chamber 4. Threaded rod 502 is rotatably installed inside valve chamber 5 and is arranged parallel to the sliding direction of valve plate 501. The threaded rod 502 threaded through valve plate 501. Servo motor 503 is fixedly installed on the outer end wall of valve chamber 5, and the drive shaft of servo motor 503 is fixedly connected to threaded rod 502. During the operation of the system, the threaded rod 502, which is connected to its drive shaft, can be driven to rotate by servo motor 503. The movement of valve plate 501 is driven by the rotation of threaded rod 502 and the corresponding thread of valve plate 501.

[0055] Under normal conditions, the valve plates 501 in the upper and lower valve chambers 5 of the transfer chamber 4 are both closed. The upper and lower valve plates 501 open and close evenly and periodically. The upper and lower valve plates 501 are only closed at the same time, and there is no state where the upper and lower valve plates 501 are open at the same time. When the upper valve plate 501 opens, the filaments accumulated at the bottom of the vacuum chamber 2 fall down into the transfer chamber 4. After the filaments enter the transfer chamber 4, the upper valve plate 501 closes again, and then the lower valve plate 501 opens. After the filaments in the transfer chamber 4 fall out, the lower valve plate 501 closes again. This ensures that the filaments can fall out smoothly, and also avoids that the negative pressure state formed by the vacuuming in the vacuum chamber 2 is greatly affected, which is conducive to ensuring its operational stability.

[0056] Please see Figure 8 Each valve chamber 5 contains two rotatably mounted threaded rods 502, which are respectively located at opposite ends of the same valve plate 501. The two threaded rods 502 in the same valve chamber 5 are connected by a transmission belt 504 located outside the valve chamber 5. During operation, the servo motor 503 is energized and starts to drive the threaded rods 502 connected to its drive shaft to rotate. Through the transmission belt 504, the two corresponding threaded rods 502 rotate synchronously, driving the same valve plate 501 to move and perform opening and closing operations. By inserting the threads of the two valve plates 501 into the left and right ends of the valve plate 501, the stability of the movement of the valve plate 501 during opening and closing can be improved, and the obstruction of the falling of the fine wire can be avoided, thus ensuring the stability of the system during operation to a certain extent.

[0057] Please see Figure 3A pipe 301, which is fixedly connected to the suction port of the vacuum pump 3, is fixedly connected to the end wall of the vacuum chamber 2. Similarly, a pipe 301, which is fixedly connected to the suction port of the vacuum pump 3, is fixedly connected to the end wall of the transfer chamber 4. A solenoid valve is fixedly installed in the pipe 301 connected to the transfer chamber 4. During the operation of the system, before the upper valve plate 501 is opened, the solenoid valve installed in the lower pipe 301 is turned on. At this time, the vacuum pump 3 can perform a vacuuming operation in the transfer chamber 4 in advance through the lower pipe 301, further reducing the impact of the connection of the transfer chamber 4 after the upper valve plate 501 is opened on the negative pressure state in the vacuum chamber 2. When the upper valve plate 501 is closed again, the solenoid valve on the lower pipe 301 is closed, and the vacuum pump 3 no longer performs a vacuuming operation in the transfer chamber 4. After the lower valve plate 501 is opened, the filament in the transfer chamber 4 can continue to fall smoothly.

[0058] Please see Figure 1 and Figure 9 The bottom of the transfer chamber 4 is fixedly connected to the discharge chamber 6 located above the main unit 1. The top of the main unit 1 is also fixedly installed with a bracket 601 that runs through the bottom of the discharge chamber 6. Conveying rollers 602 located outside the discharge chamber 6 are symmetrically rotated at both ends of the bracket 601. The outer sides of the two conveying rollers 602 are fitted with a conveyor belt 603 that passes through the bottom of the discharge chamber 6. The top of the main unit 1 is fixedly installed with a servo motor 604 that is connected to the conveying rollers 602. During the operation of the system, when the filaments fall from the transfer chamber 4 into the discharge chamber 6, they will fall onto the conveyor belt 603. At this time, the servo motor 604 is powered on and started, driving the conveying rollers 602 to rotate, which in turn drives the conveyor belt 603 to rotate, and the filaments that have fallen on it are transported outward in an orderly manner. The transported filaments are sent into the millimeter-level pelletizer for pelletizing.

[0059] Example 2:

[0060] This invention provides a process for producing EPP foamed granules using recycled EPP components. Please refer to [link to relevant documentation]. Figure 1 - Figure 10 This includes the following steps:

[0061] Includes the following steps:

[0062] ① After the plastic granules enter the extrusion cylinder 101, they are conveyed under the continuous rotation of the screw 102 and melted by heat during the conveying process;

[0063] ② The screw 102 rotates continuously to apply extrusion pressure to the molten plastic particles, causing them to be extruded outward from the extrusion hole 104 on the die head 103. Simultaneously, the pipe 301 is powered on to draw the vacuum chamber 2 into a negative pressure state, and pulls the filaments formed in the extrusion hole 104 from the outside.

[0064] ③ During the filament extrusion molding process, electromagnetic clamp 203 grabs the end of the filament and moves away from the die head 103 under the drive of electromagnetic slide 202. During this process, electromagnetic clamp 205 simultaneously grabs the end of the filament and electromagnetic slide 204 drives electromagnetic clamp 205 to move in the same direction as electromagnetic slide 202.

[0065] ④ When the electromagnetic slide rail 201 is pulled to the middle position, the electromagnetic slide block 204 drives the electromagnetic clamp 205 to continue to grab the end of the filament and move away from the die head 103. The electromagnetic clamp 203 then releases its grip on the filament and returns to the initial position under the drive of the electromagnetic slide block 202.

[0066] ⑤ When the electromagnetic clamp 205 moves away from the die head 103 to the limit position on the electromagnetic slide rail 201, it releases the grip on the filament and moves back to the die head 103 to reset. Simultaneously, the electric cutting blade 206 is powered on and starts to cut the filament.

[0067] ⑥ Repeat steps ③-⑤ above, and the extruded filaments continue to accumulate at the bottom of vacuum chamber 2;

[0068] ⑦ The valve plate 501 in the valve chamber 5 above the transfer chamber 4 is driven to open, and the fine wires accumulated at the bottom of the vacuum chamber 2 fall into the transfer chamber 4. Then, the upper valve plate 501 closes again, the lower valve plate 501 opens, and the fine wires fall onto the conveyor belt 603 at the bottom of the discharge chamber 6. The lower valve plate 501 closes again, and the fine wires that have fallen onto the conveyor belt 603 are output outward.

[0069] The above are merely the best implementation methods adopted in this application in light of current practical needs, but the scope of protection of this application is not limited thereto.

Claims

1. A foaming system for producing EPP foamed granules using recycled EPP components, comprising a pretreatment section, a reshaping section, a reaction section, and a post-treatment section, wherein, The reshaping unit includes a mixer, a plastic extruder, and a millimeter-scale pelletizer. The plastic extruder includes a main unit (1), and a horizontally arranged extrusion cylinder (101) is fixedly mounted on the top of the main unit (1). A screw (102) is rotatably mounted inside the extrusion cylinder (101). The unit is characterized by: It also includes a die head (103), which is fixedly installed at the extrusion port of the screw (102); Extrusion holes (104), a plurality of the extrusion holes (104) are arranged side by side inside the die head (103); Vacuum chamber (2), which is fixedly installed on the outer end wall of the extrusion cylinder (101) and wrapped around the outside of the die head (103); Vacuum pump (3), which is fixedly installed on the top of the main unit (1) and connected to the inside of the vacuum chamber (2); The extrusion hole (104) is directly connected to the vacuum chamber (2); The inner diameter of a single extrusion orifice (104) is set to 0.3 mm.

2. The foaming system for producing EPP foamed granules using recycled EPP components according to claim 1, characterized in that: An electromagnetic slide rail (201) located on the same straight line as the extrusion cylinder (101) is fixedly installed on the inner end wall of the vacuum chamber (2), and an electromagnetic slide block (202) is slidably installed inside the electromagnetic slide rail (201). An electromagnetic clamp (203) located on the same horizontal plane as the plurality of extrusion holes (104) is fixedly installed on the electromagnetic slide block (202).

3. The foaming system for producing EPP foamed granules using recycled EPP components according to claim 2, characterized in that: The electromagnetic slide rail (201) has an electromagnetic slide block two (204) slidably installed inside, located on the other side of the electromagnetic slide block one (202), and an electromagnetic clamp two (205) is fixedly installed on the electromagnetic slide block two (204) on the same plane as the electromagnetic clamp one (203).

4. The foaming system for producing EPP foamed granules using recycled EPP components according to claim 3, characterized in that: The vacuum chamber (2) is fixedly installed with electric cutting blades (206) on the upper and lower sides of the electromagnetic slide rail (201), and the electric cutting blades (206) are located on the side close to the mold head (103) and 5cm away from it.

5. The foaming system for producing EPP foamed granules using recycled EPP components according to claim 4, characterized in that: A cooling unit (207) is fixedly installed on the inner end wall of the vacuum chamber (2) and covers the electromagnetic slide rail (201). The temperature of the cooling unit (207) gradually decreases from the side closer to the mold head (103) to the side farther away from the mold head (103).

6. The foaming system for producing EPP foamed granules using recycled EPP components according to claim 5, characterized in that: The bottom of the vacuum chamber (2) is fixedly connected to the transfer chamber (4), and valve chambers (5) are fixedly installed on both the upper and lower sides of the transfer chamber (4). A valve plate (501) is slidably installed inside the valve chamber (5) and sealed at the port of the transfer chamber (4). A threaded rod (502) is rotatably installed inside the valve chamber (5) and is parallel to the sliding direction of the valve plate (501). The threaded rod (502) is threaded through the valve plate (501). A servo motor (503) is fixedly installed on the outer end wall of the valve chamber (5), and the drive shaft of the servo motor (503) is fixedly connected to the threaded rod (502).

7. The foaming system for producing EPP foamed granules using recycled EPP components according to claim 6, characterized in that: Two threaded rods (502) are rotatably installed in each valve chamber (5). The two threaded rods (502) are respectively set in the two symmetrical ends on the same valve plate (501). The two threaded rods (502) in the same valve chamber (5) are connected by a transmission belt (504) located outside the valve chamber (5).

8. The foaming system for producing EPP foamed granules using recycled EPP components according to claim 7, characterized in that: The end wall of the vacuum chamber (2) is fixedly connected to a pipe (301) that is connected to the air extraction port of the vacuum pump (3). The end wall of the transfer chamber (4) is also fixedly connected to a pipe (301) that is fixedly connected to the air extraction port of the vacuum pump (3). A solenoid valve is fixedly installed in the pipe (301) that is connected to the transfer chamber (4).

9. The foaming system for producing EPP foamed granules using recycled EPP components according to claim 8, characterized in that: The bottom of the transfer bin (4) is fixedly connected to the discharge bin (6) located above the host (1). The top of the host (1) is also fixedly installed with a bracket (601) that passes through the discharge bin (6). The two ends of the bracket (601) are symmetrically rotated with conveyor rollers (602) located outside the discharge bin (6). The outer sides of the two conveyor rollers (602) are jointly fitted with a conveyor belt (603) that passes through the interior of the discharge bin (6). The top of the host (1) is fixedly installed with a servo motor (604) whose drive shaft is connected to the conveyor rollers (602).

10. A process for a foaming system for producing EPP foamed granules using recycled EPP components according to claim 9, characterized in that, Includes the following steps: Plastic granules are hot-melt extruded using a plastic extruder to form fine filaments with a diameter of 0.2-0.3 mm. The process of using a plastic extruder includes: ① After the plastic granules enter the extrusion cylinder (101), they are conveyed under the continuous rotation of the screw (102) and melted by heat during the conveying process; ② The screw (102) rotates continuously to apply extrusion pressure to the molten plastic particles, causing them to be extruded outward from the extrusion hole (104) on the die head (103). Simultaneously, the pipe (301) is powered on to draw the vacuum chamber (2) into a negative pressure state, and pulls the filaments formed in the extrusion hole (104) from the outside. ③ During the filament extrusion molding process, electromagnetic clamp one (203) grips the end of the filament and moves away from the die head (103) under the drive of electromagnetic slide one (202). During this process, electromagnetic clamp two (205) grips the end of the filament simultaneously, and electromagnetic slide two (204) drives electromagnetic clamp two (205) to move in the same direction as electromagnetic slide one (202). ④ When the electromagnetic slide rail (201) is pulled to the middle position, the electromagnetic slide block two (204) drives the electromagnetic clamp two (205) to continue to grab the end of the filament and move away from the die head (103). The electromagnetic clamp one (203) releases the grip on the filament and returns to the initial position under the drive of the electromagnetic slide block one (202). ⑤ When the electromagnetic clamp (205) moves away from the die head (103) to the limit position on the electromagnetic slide rail (201), it releases the grip on the filament and moves back to the die head (103) to reset. Simultaneously, the electric cutting blade (206) is powered on to cut the filament. ⑥ Repeat steps ③-⑤, and the extruded filaments continue to accumulate at the bottom of the vacuum chamber (2); ⑦ The valve plate (501) in the valve chamber (5) above the transfer chamber (4) is driven to open, and the filaments accumulated at the bottom of the vacuum chamber (2) fall into the transfer chamber (4). Then, the upper valve plate (501) closes again, the lower valve plate (501) opens, and the filaments fall onto the conveyor belt (603) at the bottom of the discharge chamber (6). The lower valve plate (501) closes again, and the filaments that have fallen onto the conveyor belt (603) are output outward.

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