A foamed product and its processing technology and apparatus

Abstract

This invention belongs to the field of foamed plastics technology, specifically a foamed product, its processing technology, and apparatus. It includes an extruder barrel with an extrusion screw rotatably mounted within it, and a dispersion and addition component mounted on the extruder barrel. This component is used to disperse and add a foaming agent into the polyolefin. By using a dispersion and addition component, the invention utilizes a small-diameter, uniformly dispersed conveyor needle to transport foaming agent particles, thereby retaining these particles in the insertion holes formed by the conveyor needle. Increasing the density and dispersion of the insertion holes effectively enhances the dispersion of the foaming agent particles during addition. Combined with the mixing action of the extruder barrel and the extrusion screw, this effectively enhances the uniformity of the dispersion of the foaming agent particles in the raw materials, resulting in a uniformly dispersed bubble structure in the finished foamed product.

Description

Technical Field

[0001] This invention belongs to the field of foamed plastics technology, specifically a foamed product and its processing technology and apparatus. Background Technology

[0002] Polyolefin foamed building materials refer to profiles made from plastics such as polyethylene and polypropylene, with the addition of inorganic filler masterbatch, weather-resistant masterbatch, color masterbatch, foaming agent and regulator, through mixing, melt extrusion, molding, cooling and cutting. Because polyolefin foamed building materials are non-toxic, environmentally friendly and have excellent performance, they are widely used in the construction industry.

[0003] Continuous extrusion foaming is one of the production processes for polyolefin foamed building materials. Due to its advantages such as high production efficiency and stable product quality, continuous extrusion foaming is widely used. In the continuous extrusion foaming process, plastic particles and foaming agents need to be mixed first, followed by heating and stirring to ensure that the foaming agent is evenly distributed in the molten polyolefin. However, in practical applications, it has been found that, on the one hand, the particle size of polyolefin and foaming agent is different, and the stirring resistance of polyolefin in the hot melt state is relatively large, making it difficult to disperse the foaming agent in polyolefin. On the other hand, because the foaming agent has a certain hygroscopic effect, and the foaming agent particles are prone to agglomeration under electrostatic action, the difficulty of dispersing the foaming agent in polyolefin is further increased.

[0004] The related technology discloses a foamed polypropylene masterbatch extrusion equipment, application number CN2023113622261. This solution sets a grinding chamber in the extruder, and the extrusion screw cooperates with the grinding chamber to shear and grind the raw material into small particles. At the same time, the extrusion screw drives the grinding roller to rotate, and the grinding roller cooperates with the grinding box to grind the foaming agent. The ground foaming agent is mixed with the raw material, and the mixing is more uniform. However, in the actual application process, it was found that because the polyolefin in the hot melt state is relatively viscous, it is not easy to quickly disperse the powdered foaming agent when it is added to the polyolefin.

[0005] In view of this, the present invention proposes a foamed product and its processing technology and apparatus to solve the above-mentioned technical problems. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies and solve the aforementioned technical problems, this invention proposes a foamed product and its processing technology and apparatus.

[0007] The technical solution adopted by the present invention to solve its technical problem is: the foamed product processing device of the present invention includes an extruder barrel, an extrusion screw is rotatably installed in the extruder barrel, and the interior of the extruder barrel is sequentially divided into a solid conveying section, a melting section and a melt conveying section;

[0008] It also includes a dispersion addition component, which is mounted on the extruder barrel and is used to disperse the foaming agent into the polyolefin;

[0009] The dispersion addition component includes a connecting housing, a drive roller, and a delivery needle;

[0010] A connecting shell is fixedly installed on the extruder barrel. The connecting shell is aligned with the melt conveying section and is electrically connected to the inner cavity of the extruder barrel.

[0011] A drive roller is rotatably installed inside the connecting shell. The drive roller is connected to a drive motor. A storage cavity is opened inside the drive roller. A material pipe is installed on the connecting shell for conveying foaming agent particles into the storage cavity.

[0012] The drive roller has uniformly distributed mounting holes, and the conveying needle is mounted on the drive roller through the mounting holes. The conveying needle has uniformly distributed microgrooves.

[0013] It also includes a forced telescopic assembly, which is mounted on the connecting housing and is used to drive the delivery needle to reciprocate inside and outside the storage cavity.

[0014] Preferably, a scraper ring is fixedly installed at the connection between the mounting hole and the storage cavity, and a flow-blocking plate is fixedly installed at the connection between the connecting shell and the inner cavity of the extruder barrel.

[0015] Preferably, the dispersion additive components are provided in multiple sets, and the multiple sets of dispersion additive components are evenly arranged along the spiral direction of the extrusion screw.

[0016] Preferably, the forced telescopic assembly includes an irregularly shaped rod, an assembly plate, and a sliding column;

[0017] The irregularly shaped rod is fixedly installed on the connecting shell, and the irregularly shaped rod extends into the storage cavity. A limiting groove is formed at one end of the irregularly shaped rod located in the storage cavity.

[0018] The delivery needles are divided into multiple groups, and the delivery needles in the same group are fixedly connected by an assembly plate.

[0019] Each of the assembly plates has a sliding column fixedly installed at the end facing the irregular rod, and the sliding column extends into the limiting groove.

[0020] Preferably, a separator ring is fixedly installed inside the storage cavity, the separator ring and the drive roller are designed coaxially, the foaming agent particles are located between the separator ring and the inner wall of the storage cavity, and the delivery needle passes through the separator ring.

[0021] Preferably, the delivery needle is composed of a needle tube and an elastic sheet. The needle tube is a hollow tubular structure with uniformly perforated surfaces. An elastic sheet is fixedly installed on the inner wall of the needle tube. The elastic sheet is made of a high-temperature resistant elastic material.

[0022] Preferably, a pressure regulating tube is fixedly installed on the assembly plate, and the pressure regulating tube is electrically connected to the corresponding needle tube cavity. A compressor, a condenser and an expansion valve are installed on the connecting shell. The compressor, expansion valve, pressure regulating tube, needle tube and condenser constitute a refrigeration system for cooling the needle tube.

[0023] Preferably, the elastic sheet protrudes outward from the needle tube in its initial state.

[0024] A processing technology for foamed products, the process comprising the following steps:

[0025] S1: The polyolefin raw material is fed into the over-homogenization chamber by negative pressure suction and is heated in the over-homogenization chamber;

[0026] S2: HDPE, filler masterbatch, color masterbatch, and weather-resistant masterbatch are weighed according to the proportion and fed into the mixer. After mixing, the mixture is conveyed to the transition silo and continuously fed into the extruder barrel under negative pressure conveying.

[0027] S3: The raw material is transported, heated and stirred in the extruder barrel under the conveying of the extrusion screw. When the molten raw material is conveyed to the melt conveying section, the dispersion addition component and the forced expansion component work together to evenly disperse the foaming agent in the raw material.

[0028] S4: After the raw materials and foaming agent are mixed, they are continuously transported and stirred under the action of the extrusion screw. They are then extruded through the extruder head at the end of the extruder barrel, shaped and cooled in the mold, and then traction, cutting, subsequent processing and assembly to produce the finished product.

[0029] A foamed product comprising a core layer and a surface layer, wherein the surface layer is distributed above and below the core layer, and the core layer and the surface layer constitute a three-layer overlapping structure.

[0030] The core layer is composed of the following materials:

[0031] HDPE 84.3%;

[0032] 10% filler masterbatch;

[0033] Masterbatch 3%;

[0034] Foaming agent regulator 0.15%;

[0035] Foaming agent 0.25%;

[0036] Polymer dispersant 0.3%;

[0037] Weather-resistant masterbatch 2%;

[0038] The surface layer is composed of the following materials:

[0039] HDPE, along with abrasion-resistant and scratch-resistant resins, accounted for 96.7% of the total.

[0040] Masterbatch 3%;

[0041] Wood grain color masterbatch 0.3%.

[0042] The beneficial effects of this invention are as follows:

[0043] 1. The foamed product and its processing technology and apparatus of the present invention, by setting up a dispersion addition component, utilizes a small-diameter, uniformly dispersed conveying needle to transport foaming agent particles, thereby allowing the foaming agent particles to be retained in the insertion holes formed by the conveying needle. By increasing the density and dispersion of the insertion holes, the dispersion degree of the foaming agent particles during addition can be effectively enhanced. Combined with the stirring and mixing action of the extruder barrel and extrusion screw, the dispersion uniformity of the foaming agent particles in the raw materials can be effectively enhanced, thereby making the bubbles in the finished foamed product uniformly dispersed.

[0044] 2. The foaming product and its processing technology and apparatus described in this invention, through continuous cooling of the conveying needle, can cause the molten raw material in contact with the conveying needle to gradually solidify, thereby reducing the difficulty of separating the conveying needle from the raw material. Furthermore, since the conveying needle is in the molten raw material, its heat absorption efficiency is increased, thereby increasing the evaporation rate of the refrigerant, thus reducing the cooling effect of the conveying needle. At this time, the elastic sheet inside the needle tube expands under the action of thermal expansion and contraction, thereby pushing the foaming agent particles out of the micro-groove. Attached Figure Description

[0045] The invention will now be further described with reference to the accompanying drawings.

[0046] Figure 1 This is a perspective view of the present invention;

[0047] Figure 2 This is a three-dimensional view of the dispersed addition of components in this invention;

[0048] Figure 3 This is a perspective view of the dispersed addition of components in this invention;

[0049] Figure 4 This is a diagram of the internal structure of the connected shell;

[0050] Figure 5 It is a 3D diagram of an irregularly shaped rod;

[0051] Figure 6 It is a 3D view of the drive roller;

[0052] Figure 7 It is an assembly diagram of the delivery needle and the assembly plate;

[0053] Figure 8 This is a cross-sectional view of the delivery needle;

[0054] Figure 9 This is a partial cross-sectional view of the present invention;

[0055] Figure 10 yes Figure 9 A magnified view of a section at point A in the middle;

[0056] Figure 11 Flowchart of the method of this invention;

[0057] In the diagram: 1. Extruder barrel; 11. Solid conveying section; 12. Melting section; 13. Melt conveying section; 2. Connecting shell; 21. Drive roller; 22. Storage chamber; 23. Material tube; 24. Mounting hole; 25. Conveying needle; 26. Microgroove; 27. Needle tube; 28. Elastic sheet; 31. Baffle plate; 4. Shaped rod; 41. Limiting groove; 42. Assembly plate; 43. Sliding column; 5. Separating ring; 6. Pressure regulating pipe; 61. Compressor; 62. Condenser; 63. Expansion valve. Detailed Implementation

[0058] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0059] like Figures 1 to 10 As shown, the foaming product processing device of the present invention includes an extruder barrel 1, in which an extrusion screw is rotatably installed. The interior of the extruder barrel 1 is sequentially divided into a solid conveying section 11, a melting section 12 and a melt conveying section 13.

[0060] It also includes a dispersion addition component, which is mounted on the extruder barrel 1 and is used to disperse the foaming agent into the polyolefin;

[0061] The dispersion addition component includes a connecting housing 2, a drive roller 21, and a conveying needle 25;

[0062] A connecting shell 2 is fixedly installed on the extruder barrel 1. The connecting shell 2 is aligned with the melt conveying section 13 and is electrically connected to the inner cavity of the extruder barrel 1.

[0063] A drive roller 21 is rotatably installed inside the connecting shell 2. The drive roller 21 is externally connected to a drive motor. A storage cavity 22 is opened inside the drive roller 21. A material pipe 23 is installed on the connecting shell 2 for conveying foaming agent particles into the storage cavity 22.

[0064] The drive roller 21 has uniformly distributed mounting holes 24, and the conveying needle 25 is mounted on the drive roller 21 through the mounting holes 24. The conveying needle 25 has uniformly distributed microgrooves 26.

[0065] It also includes a forced telescopic assembly, which is mounted on the communicating housing 2 and is used to drive the delivery needle 25 to reciprocate within and outside the storage cavity 22.

[0066] In the continuous extrusion foaming process, plastic granules are fed into the feeding hopper on the extruder barrel 1. Under the action of gravity, the raw material will automatically flow into the extruder barrel 1. Simultaneously, the extrusion screw driven by the power equipment rotates. When the extrusion screw rotates, the raw material is pushed to move, heat and melt in the extruder barrel 1 through friction. During this process, the foaming agent particles are dispersed and added to the molten raw material through the dispersion addition component. Combined with the stirring action of the extrusion screw on the molten raw material, the difficulty of uniformly mixing the foaming agent and the plastic raw material is effectively reduced.

[0067] Specifically, under the conveying action of the extrusion screw, the plastic raw material sequentially enters the solid conveying section 11, the melting section 12, and the melt conveying section 13 of the extruder barrel 1. In the solid conveying section 11, the solid plastic raw material is compacted by the action of the inner wall of the extruder barrel 1 and the extrusion screw. After initial compaction, the raw material enters the melting section 12, also known as the compression section. During conveying, the raw material is further compacted and plasticized, and any air entrained in the plastic is forced back to the feed hopper and discharged to the outside. Simultaneously, the raw material is continuously subjected to external heating from the extruder barrel 1 and the stirring, mixing, and shearing action of the extrusion screw and the barrel. When the raw material reaches the melt conveying section 13, it has completely transformed from a solid to a molten state. During transport in this section, the drive roller 21, driven by an external drive motor, maintains the same speed as the raw material. The conveying needles 25 mounted on the moving roller 21, in conjunction with the forced telescopic component, undergo a cyclical motion of inserting into the raw material, pulling out the raw material, and retracting into the storage cavity 22 during rotation. During the cyclical motion of the conveying needles 25, when the conveying needles 25 are in the storage cavity 22, the foaming agent particles adhere to the microgrooves 26 on the surface of the conveying needles 25, and then follow the conveying needles 25 into the raw material. Under the viscous action of the raw material, when the conveying needles 25 detach from the raw material, the foaming agent particles in the microgrooves 26 are left in the raw material. Under the continuous rotation of the drive roller 21, the numerous conveying needles 25 form uniform insertion holes in the raw material, thereby dispersing the foaming agent in the raw material. Then, when the raw material continues to move, it will be subjected to the stirring, mixing, and shearing action of the extrusion screw and the extruder barrel 1 again, thereby dispersing the foaming agent particles in the raw material.

[0068] This invention utilizes a dispersion addition component, employing a small-diameter, uniformly dispersed delivery needle 25 to transport foaming agent particles. This allows the foaming agent particles to be retained in the insertion holes formed by the delivery needle 25. By increasing the density and dispersion of the insertion holes, the dispersion degree of the foaming agent particles during addition can be effectively enhanced. Combined with the stirring and mixing action of the extruder barrel 1 and the extrusion screw, the uniformity of the dispersion of the foaming agent particles in the raw materials can be effectively enhanced, resulting in uniformly dispersed bubbles in the finished foamed product.

[0069] In a preferred embodiment of the present invention, a scraper ring is fixedly installed at the connection between the mounting hole 24 and the storage cavity 22, and a flow-blocking plate 31 is fixedly installed at the connection between the connecting shell 2 and the inner cavity of the extruder barrel 1.

[0070] The scraping ring and the flow-blocking plate 31 can prevent the molten raw material from flowing into the storage cavity 22 and the inner cavity of the connecting shell 2. On the other hand, they can also scrape the surface of the conveying needle 25, thereby intercepting the foaming agent particles on the surface of the conveying needle 25. The foaming agent particles in the microgrooves 26 on the surface of the conveying needle 25 can be carried, so that the content of foaming agent particles carried by the conveying needle 25 during a single transport is relatively fixed. Combined with the number of conveying needles 25 and the density of the insertion holes, the uniformity of the addition of foaming agent particles can be effectively enhanced.

[0071] In a preferred embodiment of the present invention, the dispersing additive components are provided in multiple sets, and the multiple sets of dispersing additive components are evenly arranged along the spiral direction of the extrusion screw.

[0072] The setup of multiple sets of dispersed additive components allows the molten raw material between the extruder barrel 1 and the extrusion screw to come into contact from different angles, thereby reducing dead zones in the addition of foaming agent and enhancing the uniformity of foaming agent addition.

[0073] In a preferred embodiment of the present invention, the forced telescopic component includes an irregular rod 4, an assembly plate 42, and a sliding column 43;

[0074] The irregular rod 4 is fixedly installed on the communicating shell 2. The irregular rod 4 extends into the storage cavity 22. A limiting groove 41 is formed at one end of the irregular rod 4 located in the storage cavity 22.

[0075] The delivery needles 25 are divided into multiple groups, and the delivery needles 25 in the same group are fixedly connected by the assembly plate 42.

[0076] Each of the assembly plates 42 has a sliding column 43 fixedly installed at the end facing the irregular rod 4, and the sliding column 43 extends into the limiting groove 41.

[0077] During the continuous addition of foaming agent, as the drive roller 21 rotates continuously, the irregularly shaped rod 4, fixedly mounted on the connecting housing 2, generates relative movement with the drive roller 21. Since the conveying needles 25 are divided into multiple groups, and the conveying needles 25 in the same group are fixedly connected by the assembly plate 42, and the assembly plate 42 is connected to the irregularly shaped rod 4 through the sliding column 43 and the limiting groove 41, the rotation of the drive roller 21 drives the conveying needles 25 to rotate, thereby causing relative movement between the assembly plate 42 and the irregularly shaped rod 4. At this time, the sliding column 43 slides in the limiting groove 41. During the sliding process, the irregularly shaped rod 4 moves relative to the drive roller 21 in the circumferential direction. The different spacing between the rollers 21 enables the pushing and pulling of the sliding column 43, thereby changing the distance between the assembly plate 42 and the axis of the drive roller 21. When the distance between the assembly plate 42 and the axis of the drive roller 21 increases, the conveying needle 25 moves from the storage cavity 22 into the inner cavity of the extruder barrel 1. When the distance between the assembly plate 42 and the axis of the drive roller 21 decreases, the conveying needle 25 moves from the inner cavity of the extruder barrel 1 into the storage cavity. During the periodic extension and retraction of the conveying needle 25, the conveying needle 25 continuously conveys the foaming agent particles to the molten raw material through the microgrooves 26 on its surface, thereby achieving continuous addition of the foaming agent.

[0078] In a preferred embodiment of the present invention, a partition ring 5 is fixedly installed inside the storage cavity 22, the partition ring 5 is coaxially designed with a drive roller 21, the foaming agent particles are located between the partition ring 5 and the inner wall of the storage cavity 22, and the delivery needle 25 passes through the partition ring 5.

[0079] By fixing and installing the separator ring 5 in the storage cavity 22, the foaming agent particles are isolated from the shaped rod 4. On the one hand, this can effectively reduce the probability of the foaming agent particles clogging the limiting groove 41 and ensure the smooth movement of the sliding column 43 in the limiting groove 41. On the other hand, during the movement of the assembly plate 42 and the conveying needle 25, only the conveying needle 25 passes through the foaming agent particles, which effectively reduces the resistance of the foaming agent particles to the movement of the assembly plate 42.

[0080] In a preferred embodiment of the present invention, the delivery needle 25 is composed of a needle tube 27 and an elastic sheet 28. The needle tube 27 is a hollow tubular structure with uniformly open holes on its surface. An elastic sheet 28 is fixedly installed on the inner wall of the needle tube 27. The elastic sheet 28 is made of a high-temperature resistant elastic material.

[0081] The delivery needle 25 is constructed using a needle tube 27 and an elastic sheet 28. In practical applications, when the delivery needle 25 retracts into the storage cavity 22, the foaming agent particles enter the microgrooves 26 on the surface of the delivery needle 25 under the action of gravity. Since the microgrooves 26 are composed of holes on the surface of the needle tube 27 and the elastic sheet 28, when the delivery needle 25 moves into the extruder barrel 1, the delivery needle 25 is scraped by the scraper ring. During the scraping process, when the foaming agent particles in the microgrooves 26 are subjected to the scraping force, they can enhance the retention effect of the microgrooves 26 on the foaming agent particles by pushing the elastic sheet 28 to deform slightly.

[0082] In a preferred embodiment of the present invention, a pressure regulating pipe 6 is fixedly installed on the assembly plate 42. The pressure regulating pipe 6 is electrically connected to the inner cavity of the corresponding needle tube 27. A compressor 61, a condenser 62 and an expansion valve 63 are installed on the connecting shell 2. The compressor 61, the expansion valve 63, the pressure regulating pipe 6, the needle tube 27 and the condenser 62 constitute a refrigeration system for cooling the needle tube 27.

[0083] In a preferred embodiment of the present invention, the elastic sheet 28 protrudes outward from the needle tube 27 in the initial state.

[0084] Using needle tube 27 as the evaporator, during the entire operation, compressor 61 draws the evaporated refrigerant from needle tube 27 through a pipeline, compresses the refrigerant, and then delivers the compressed refrigerant to needle tube 27 via condenser 62, expansion valve 63, and pressure regulating pipe 6. The refrigerant then evaporates in needle tube 27, causing it to absorb heat and cool. When the delivery needle 25 is located in extruder barrel 1, the delivery needle 25 continuously cools, allowing the molten material in contact with the delivery needle 25 to gradually solidify, thus reducing the difficulty of separating the delivery needle 25 from the material. Furthermore, because the delivery needle 25 is located within the molten material... When the refrigerant is in the middle, its heat absorption efficiency increases, which in turn increases the evaporation rate of the refrigerant. As a result, the cooling effect of the delivery needle 25 decreases. At this time, the elastic sheet 28 inside the needle tube 27 expands under the action of thermal expansion and contraction, which pushes the foaming agent particles out of the microgroove 26. When the delivery needle 25 is in the storage cavity 22, the heat transfer outside the delivery needle 25 slows down, so the temperature of the delivery needle 25 continues to decrease. Under the action of thermal expansion and contraction, the elastic sheet 28 contracts, which causes the elastic sheet 28 that was initially protruding outward to gradually flatten. This increases the volume of the microgroove 26, making it easier to collect the foaming agent particles.

[0085] like Figure 11 As shown, a foamed product processing technology includes the following steps:

[0086] S1: HDPE raw materials are fed into the over-homogenization chamber by negative pressure suction conveying, and homogenization is carried out in the over-homogenization chamber;

[0087] S2: After weighing the homogenized HDPE, filler masterbatch, color masterbatch, and weather-resistant masterbatch according to the proportion, it is fed into the mixer and then conveyed to the transition silo after the mixing is completed. Under the action of negative pressure conveying, it is continuously fed into the extruder barrel 1.

[0088] S3: The raw material is transported, heated and stirred in the extruder barrel 1 under the conveying of the extrusion screw. When the molten raw material is conveyed to the melt conveying section 13, the dispersion addition component and the forced expansion component work together to evenly disperse the foaming agent in the raw material.

[0089] S4: After the raw materials and foaming agent are mixed, they are continuously transported and stirred under the action of the extrusion screw, and then extruded through the extruder head at the end of the extruder barrel 1. After being shaped and cooled in the mold, the finished product is made by traction, cutting, subsequent processing and assembly.

[0090] A foamed product comprising a core layer and a surface layer, wherein the surface layer is distributed above and below the core layer, and the core layer and the surface layer constitute a three-layer overlapping structure.

[0091] The core layer is composed of the following materials:

[0092] HDPE 84.3%;

[0093] 10% filler masterbatch;

[0094] Masterbatch 3%;

[0095] Foaming agent regulator 0.15%;

[0096] Foaming agent 0.25%;

[0097] Polymer dispersant 0.3%;

[0098] Weather-resistant masterbatch 2%;

[0099] The surface layer is composed of the following materials:

[0100] HDPE, along with abrasion-resistant and scratch-resistant resins, accounted for 96.7% of the total.

[0101] Masterbatch 3%;

[0102] Wood grain color masterbatch 0.3%.

[0103] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A foamed product processing apparatus, comprising an extruder barrel (1), wherein an extrusion screw is rotatably mounted in the extruder barrel (1), and the interior of the extruder barrel (1) is sequentially divided into a solid conveying section (11), a melting section (12) and a melt conveying section (13). Its features are: It also includes a dispersion addition component, which is mounted on the extruder barrel (1) and is used to disperse the foaming agent into the polyolefin; The dispersion addition component includes a connecting housing (2), a drive roller (21), and a delivery needle (25). A connecting shell (2) is fixedly installed on the extruder barrel (1). The connecting shell (2) is aligned with the melt conveying section (13). The connecting shell (2) is electrically connected to the inner cavity of the extruder barrel (1). A drive roller (21) is rotatably installed inside the connecting shell (2). The drive roller (21) is connected to a drive motor. A storage cavity (22) is opened inside the drive roller (21). A material pipe (23) is installed on the connecting shell (2) for conveying foaming agent particles into the storage cavity (22). The drive roller (21) has uniformly distributed mounting holes (24), and the conveying needle (25) is mounted on the drive roller (21) through the mounting holes (24). The conveying needle (25) has uniformly distributed microgrooves (26). It also includes a forced telescopic assembly, which is mounted on the connecting housing (2) and is used to drive the delivery needle (25) to reciprocate inside and outside the storage cavity (22).

2. The foaming product processing apparatus according to claim 1, characterized in that: A scraper ring is fixedly installed at the connection between the mounting hole (24) and the storage cavity (22), and a flow-blocking plate (31) is fixedly installed at the connection between the connecting shell (2) and the inner cavity of the extruder barrel (1).

3. The foaming product processing apparatus according to claim 2, characterized in that: The dispersion additive components are provided in multiple sets, and the multiple sets of dispersion additive components are evenly arranged along the spiral direction of the extrusion screw.

4. The foaming product processing apparatus according to claim 3, characterized in that: The forced telescopic assembly includes a shaped rod (4), an assembly plate (42), and a sliding column (43). The irregular rod (4) is fixedly installed on the communicating shell (2), the irregular rod (4) extends into the storage cavity (22), and a limiting groove (41) is opened at one end of the irregular rod (4) in the storage cavity (22). The delivery needles (25) are divided into multiple groups, and the delivery needles (25) in the same group are fixedly connected by an assembly plate (42); Each of the assembly plates (42) has a sliding column (43) fixedly installed at the end facing the shaped rod (4), and the sliding column (43) extends into the limiting groove (41).

5. The foaming product processing apparatus according to claim 4, characterized in that: A separator ring (5) is fixedly installed inside the storage cavity (22). The separator ring (5) is coaxially designed with the drive roller (21). The foaming agent particles are located between the separator ring (5) and the inner wall of the storage cavity (22). The delivery needle (25) passes through the separator ring (5).

6. The foaming product processing apparatus according to claim 5, characterized in that: The delivery needle (25) is composed of a needle tube (27) and an elastic sheet (28). The needle tube (27) is a hollow tubular structure with uniformly open holes on the surface. An elastic sheet (28) is fixedly installed on the inner wall of the needle tube (27). The elastic sheet (28) is made of high-temperature resistant elastic material.

7. The foaming product processing apparatus according to claim 6, characterized in that: A pressure regulating pipe (6) is fixedly installed on the assembly plate (42). The pressure regulating pipe (6) is connected to the inner cavity of the corresponding needle tube (27). A compressor (61), a condenser (62) and an expansion valve (63) are installed on the connecting shell (2). The compressor (61), expansion valve (63), pressure regulating pipe (6), needle tube (27) and condenser (62) constitute a refrigeration system for cooling the needle tube (27).

8. The foaming product processing apparatus according to claim 7, characterized in that: The elastic sheet (28) initially protrudes outward from the needle tube (27).

9. A processing technology for foamed products, characterized in that: The foamed product processing technology uses the foamed product processing apparatus of claim 8, and the process includes the following steps: S1: The polyolefin raw material is fed into the over-homogenization chamber by negative pressure suction and is heated in the over-homogenization chamber; S2: Weigh HDPE, filler masterbatch, color masterbatch and weather-resistant masterbatch according to the proportion and feed them into the mixer. After the mixing is completed, the mixture is transported to the transition silo and continuously fed into the extruder barrel (1) under the action of negative pressure conveying. S3: The raw material is transported, heated and stirred in the extruder barrel (1) under the conveying of the extrusion screw. When the molten raw material is conveyed to the melt conveying section (13), the dispersion addition component and the forced expansion component work together to evenly disperse the foaming agent in the raw material. S4: After the raw materials and foaming agent are mixed, they are continuously transported and stirred under the action of the extrusion screw. They are then extruded through the extruder head at the end of the extruder barrel (1), shaped and cooled in the mold, and then traction, cutting, subsequent processing and assembly to make the finished product.

10. A foamed product, characterized in that: The foamed product is prepared using the foamed product processing technology described in claim 9; the foamed product includes a core layer and a surface layer, wherein the surface layer is distributed above and below the core layer, and the core layer and the surface layer constitute a three-layer overlapping structure; The core layer is composed of the following materials: HDPE 84.3%; 10% filler masterbatch; Masterbatch 3%; Foaming agent regulator 0.15%; Foaming agent 0.25%; Polymer dispersant 0.3%; Weather-resistant masterbatch 2%; The surface layer is composed of the following materials: HDPE, along with abrasion-resistant and scratch-resistant resins, accounted for 96.7% of the total. Masterbatch 3%; Wood grain color masterbatch 0.3%.

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