Plastic hollow pipe network and its manufacturing mold and manufacturing method
By designing a hollow plastic pipe network and using polypropylene or polyethylene materials and C-type molds for extrusion molding, the problems of heavy weight and high recycling costs of existing solid plastic nets have been solved, realizing the production of lightweight, highly resilient, and recyclable hollow pipe networks.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-10-12
- Publication Date
- 2026-04-07
AI Technical Summary
Existing solid plastic mesh products are heavy and have high recycling costs, while traditional foamed mesh production is costly and wasteful.
The design employs a hollow plastic tube network, using materials such as polypropylene or polyethylene. It is formed by extrusion molding through a C-shaped mold, avoiding the use of foaming agents. Combined with water cooling and hot roller forming processes, it produces a lightweight and highly resilient mesh material.
It enables low-cost, green and environmentally friendly production of hollow pipe networks, which have high resilience, can replace foam nets for packaging, and are easy to recycle.
Smart Images
Figure CN112172082B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of plastic mold technology, and specifically relates to a plastic hollow pipe network, its manufacturing mold, and manufacturing method. Background Technology
[0002] Existing traditional products are solid plastic mesh products or physically and chemically foamed plastic mesh products, generally produced by plastic extrusion through a die and mold. Solid products are generally heavy, inconvenient to use in some fields, and costly and wasteful during recycling. Summary of the Invention
[0003] To overcome the shortcomings of existing technologies, this invention provides a plastic hollow tube network, its manufacturing mold, and manufacturing method. This invention's plastic hollow tube network can replace foam netting for packaging products, featuring low cost, environmental friendliness, and recyclability. It can also replace floor mats, exhibiting high resilience. The mold used in this invention results in a simple structure, eliminating the need for foaming agents and producing lighter plastic hollow tube networks.
[0004] The above-mentioned objective of this invention is achieved through the following technical solution:
[0005] A plastic hollow pipe network is provided, the raw materials of which include elastomer material and auxiliary materials; wherein the elastomer material is polypropylene or polyethylene or a modified material of both; wherein the auxiliary materials include: linear material, elastomer, tackifier, anti-aging agent, and UV stabilizer.
[0006] The proportion of raw materials used can be determined based on the required hardness of the hollow fiber mesh. If a higher hardness is needed, use polypropylene or polyethylene accounting for 70-80 wt% of the total weight, with other auxiliary materials such as linear binder not exceeding 20 wt%, elastomer not exceeding 5 wt%, tackifier not exceeding 5 wt%, anti-aging agent 1 wt%, and UV stabilizer 1 wt%; the total proportion of other auxiliary materials should be 20-30 wt%. Conversely, if a lower hardness is required, elastomer should account for 70-80 wt%, and other auxiliary materials should account for 20-30 wt% of the total weight.
[0007] This invention provides an extrusion die for manufacturing the aforementioned hollow plastic mesh, producing tubular strip-shaped plastic mesh. On a production line for extruding diamond or square mesh, the extrusion die is designed with the following structure:
[0008] An extrusion C-type mold includes an inner mold and an outer mold. The inner mold is fixed on the inner rotating body of the die head, and the outer mold is fixed on the outer rotating body of the die head. The outer circumference of the inner mold is provided with C-shaped discharge mesh holes, and the inner circumference of the outer mold is provided with C-shaped discharge mesh holes.
[0009] The outer mold is fixed to the outer rotating body of the mold head through the outer mold fixing hole and screws, and the inner mold is fixed to the inner rotating body of the mold head through the inner mold fixing hole and screws;
[0010] When the die head rotates, the inner rotating body of the die head rotates in opposite directions to the outer rotating body of the die head, and the material is discharged from the C-shaped discharge mesh, forming intersecting hollow mesh holes. Depending on the product requirements, the diameter of the C-shaped discharge mesh holes can be changed by using different molds. The size of the C-shaped holes can generally vary from 1 to 100 mm.
[0011] C-type molds are more difficult to process and are made of high-grade nitrided steel, such as 38CrMoAl. After tempering and nitriding processes, the wear resistance of the mold is increased.
[0012] A process for manufacturing a plastic hollow pipe network using the above-mentioned mold:
[0013] Step 1: Heat the materials to the normal operating temperature, i.e., the elastomer material (polypropylene, polyethylene, and materials with added elastomers) and the auxiliary materials (tackifiers or anti-aging agents) are heated to 170-220℃, and then extrusion begins;
[0014] Step 2: After the material passes through the mold, the die head can be rotated to make the inner and outer molds rotate relative to each other. Because the mold is made into a C-shaped hole, after the material is extruded by rotation, the C-shaped hole becomes an O-shaped hole, forming a square or diamond-shaped tubular plastic mesh.
[0015] Step 3: The plastic mesh tube is cooled by the cooling water in the water tank, shaped by the shaping sleeve inside the water tank, and planed and unfolded underwater. It is then pulled out from the rubber roller on the water tank. After passing through the water spraying device to remove water stains from the mesh tube, it is heated by the roller in the mold constant temperature machine. The mesh tube is dehydrated and shaped twice by the hot roller to make the surface of the mesh tube smoother, resulting in the final product.
[0016] The advantages of this invention compared to the prior art are:
[0017] This invention provides a hollow plastic tube network that can replace foamed netting for packaging products, featuring low cost, environmental friendliness, and recyclability. It can also replace floor mats, offering high resilience. The mold used in this invention results in a simple structure and allows for the production of lighter hollow plastic tube networks without the need for foaming agents. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the diamond-shaped plastic hollow pipe network of the present invention.
[0019] Figure 2 This is a schematic diagram of the plastic hollow pipe network grid of the present invention.
[0020] Figure 3 This is a structural diagram of the C-type die for the extrusion port.
[0021] Figure 4 This is a schematic diagram of the outer mold of the C-shaped extrusion mold.
[0022] Figure 5 This is a schematic diagram of the inner mold of the C-shaped extrusion mold.
[0023] In the figure: 1. Outer mold fixing hole, 2. Inner mold fixing hole, 3. C-shaped discharge mesh hole, 4. Outer mold, 5. Inner mold, 6. Outer rotating part of the mold head, 7. Inner rotating part of the mold head. Detailed Implementation
[0024] The present invention is described in detail below through specific embodiments, but this does not limit the scope of protection of the present invention. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can all be obtained commercially. Example
[0025] A type of hollow plastic pipe network, the raw materials of which include polypropylene, polyethylene, and auxiliary materials; the auxiliary materials include linear materials, elastomers, tackifiers, anti-aging agents, and UV stabilizers.
[0026] Polypropylene and polyethylene account for 70-80 wt% of the total formulation, while other auxiliary materials account for 20-30 wt%. The hollow mesh tube is in the shape of a diamond mesh (e.g., Figure 1 (as shown)
[0027] An extrusion die is used to manufacture the aforementioned hollow plastic mesh, producing tubular strip-shaped plastic mesh. On a production line for extruding diamond-shaped mesh, the extrusion die is designed with the following structure:
[0028] An extrusion C-type mold includes an inner mold 5 and an outer mold 4. The inner mold 5 is fixed on the inner rotating body 7 of the die head, and the outer mold 4 is fixed on the outer rotating body 6 of the die head. The outer circumference of the inner mold 5 is provided with C-shaped discharge mesh holes 3, and the inner circumference of the outer mold 4 is provided with C-shaped discharge mesh holes 3.
[0029] The outer mold 4 is fixed to the outer rotating body 6 of the mold head through the outer mold fixing hole 1 and screws, and the inner mold 5 is fixed to the inner rotating body 7 of the mold head through the inner mold fixing hole 2 and screws.
[0030] like Figure 3The inner mold 5 is fixed to the inner rotating body 7 of the mold head through the inner mold fixing hole 2. The inner mold 5 is fixed to the inner rotating body 7 with screws and is positioned by the sub-hole of the inner rotating body 7 to ensure accurate installation. The outer mold 4 is fixed to the outer rotating body 6 of the mold head through the outer mold fixing hole 1. Because the C-shaped discharge mesh holes 3 of the inner mold 5 and the outer mold 4 have the same diameter, the outer mold 4 is positioned by the inner mold 5 to ensure the installation accuracy of the inner mold 5 and the outer mold 4. When the raw material passes through the C-shaped discharge mesh hole 3 of the mold, the mold head is started to rotate. The inner rotating body 7 and the outer rotating body 6 of the mold head rotate in opposite directions through gears. The outer mold 4 and the inner mold 5 also rotate relative to each other at the same time, thus forming a hollow mesh.
[0031] A process for manufacturing a plastic hollow pipe network using the above-mentioned mold:
[0032] Step 1: Heat the material to the normal operating temperature, i.e., for polypropylene and polyethylene, heat to 170°C, and then start extrusion;
[0033] Step 2: After the material passes through the mold, the die head can be rotated to make the inner and outer molds rotate relative to each other. Because the mold is made into a C-shaped hole, after the material is extruded by rotation, the C-shaped hole becomes an O-shaped hole, forming a diamond-shaped tubular plastic mesh.
[0034] Step 3: The plastic mesh tube is cooled by the cooling water in the water tank, shaped by the shaping sleeve inside the water tank, and planed and unfolded underwater. It is then pulled out from the rubber roller on the water tank. After passing through the water spraying device to remove water stains from the mesh tube, it is heated by the roller in the mold constant temperature machine. The mesh tube is dehydrated and shaped twice by the hot roller to make the surface of the mesh tube smoother, resulting in the final product.
[0035] Figure 4 This is a schematic diagram of the outer mold of the C-type extrusion die. Figure 4 In the diagram, A is the mold thickness, B is the discharge port height, D1 is the mold diameter, D2 is the mold fixing hole diameter, D3 is the discharge port diameter, D4 is the C-type discharge mesh diameter, and D5 is the C-type discharge mesh inner diameter.
[0036] Figure 5 This is a schematic diagram of the inner mold of the C-type extrusion die. Figure 5 In the diagram, A is the mold thickness, B is the discharge port height, d1 is the discharge port diameter, d2 is the mold fixing hole diameter, d3 is the positioning sub-hole diameter, d4 is the C-type discharge mesh diameter, and d5 is the C-type discharge mesh inner diameter.
[0037] The diameter D3 of the outer mold outlet is equal to the diameter d1 of the inner mold outlet.
[0038] The diameter D4 of the C-type discharge mesh of the outer mold is equal to the diameter d4 of the C-type discharge mesh of the inner mold.
[0039] The inner diameter D5 of the C-type discharge mesh of the outer mold is equal to the inner diameter d5 of the C-type discharge mesh of the inner mold. Example
[0040] A type of hollow plastic pipe network, the raw materials of which include polypropylene, polyethylene, and auxiliary materials; the auxiliary materials include linear materials, elastomers, tackifiers, anti-aging agents, and UV stabilizers.
[0041] Polypropylene and polyethylene account for 70-80 wt% of the total formulation, while other auxiliary materials account for 20-30 wt%. The hollow mesh tube is in the shape of a grid (e.g., ...). Figure 2 (as shown)
[0042] An extrusion die is used to manufacture the aforementioned hollow plastic mesh, producing tubular strip-shaped plastic mesh. On the production line for extruding grid mesh, the extrusion die is designed with the following structure:
[0043] An extrusion C-type mold includes an inner mold 5 and an outer mold 4. The inner mold 5 is fixed on the inner rotating body 7 of the die head, and the outer mold 4 is fixed on the outer rotating body 6 of the die head. The outer circumference of the inner mold 5 is provided with C-shaped discharge mesh holes 3, and the inner circumference of the outer mold 4 is provided with C-shaped discharge mesh holes 3.
[0044] The outer mold 4 is fixed to the outer rotating body 6 of the mold head through the outer mold fixing hole 1 and screws, and the inner mold 5 is fixed to the inner rotating body 7 of the mold head through the inner mold fixing hole 2 and screws.
[0045] like Figure 3 The inner mold 5 is fixed to the inner rotating body 7 of the mold head through the inner mold fixing hole 2. The inner mold 5 is fixed to the inner rotating body 7 with screws and is positioned by the sub-hole of the inner rotating body 7 to ensure accurate installation. The outer mold 4 is fixed to the outer rotating body 6 of the mold head through the outer mold fixing hole 1. Because the C-shaped discharge mesh holes 3 of the inner mold 5 and the outer mold 4 have the same diameter, the outer mold 4 is positioned by the inner mold 5 to ensure the installation accuracy of the inner mold 5 and the outer mold 4. When the raw material passes through the C-shaped discharge mesh hole 3 of the mold, the mold head is started to rotate. The inner rotating body 7 and the outer rotating body 6 of the mold head rotate in opposite directions through gears. The outer mold 4 and the inner mold 5 also rotate relative to each other at the same time, thus forming a hollow mesh.
[0046] A process for manufacturing a plastic hollow pipe network using the above-mentioned mold:
[0047] Step 1: Heat the material to the normal operating temperature, i.e., polypropylene, polyethylene and modified materials are heated to 170°C, and then extrusion begins;
[0048] Step 2: After the material passes through the mold, the die head can be rotated to make the inner and outer molds rotate relative to each other. Because the mold is made with C-shaped holes, after the material is extruded by rotation, the C-shaped holes become O-shaped holes, forming a grid-like tubular plastic mesh.
[0049] Step 3: The plastic mesh tube is cooled by the cooling water in the water tank, shaped by the shaping sleeve inside the water tank, and planed and unfolded underwater. It is then pulled out from the rubber roller on the water tank. After passing through the water spraying device to remove water stains from the mesh tube, it is heated by the roller in the mold constant temperature machine. The mesh tube is dehydrated and shaped twice by the hot roller to make the surface of the mesh tube smoother, resulting in the final product.
[0050] Figure 4 This is a schematic diagram of the outer mold of the C-type extrusion die. Figure 4 In the diagram, A is the mold thickness, B is the discharge port height, D1 is the mold diameter, D2 is the mold fixing hole diameter, D3 is the discharge port diameter, D4 is the C-type discharge mesh diameter, and D5 is the C-type discharge mesh inner diameter.
[0051] Figure 5 This is a schematic diagram of the inner mold of the C-type extrusion die. Figure 5 In the diagram, A is the mold thickness, B is the discharge port height, d1 is the discharge port diameter, d2 is the mold fixing hole diameter, d3 is the positioning sub-hole diameter, d4 is the C-type discharge mesh diameter, and d5 is the C-type discharge mesh inner diameter.
[0052] The diameter D4 of the C-type discharge mesh of the outer mold is equal to the diameter d4 of the C-type discharge mesh of the inner mold.
[0053] The inner diameter D5 of the C-type discharge mesh of the outer mold is equal to the inner diameter d5 of the C-type discharge mesh of the inner mold.
[0054] By using different die heads, one type rotates both the inner and outer molds simultaneously to produce diamond-shaped mesh; the other type rotates the inner mold while the outer mold remains stationary to produce square-shaped mesh. Different shapes of mesh can be made by changing the die head.
[0055] The embodiments described above are merely preferred embodiments of the present invention, and not all feasible embodiments of the present invention. Any obvious modifications made by those skilled in the art without departing from the principles and spirit of the present invention should be considered to be included within the scope of protection of the claims of the present invention.
Claims
1. A type of hollow plastic pipe network, characterized in that, The raw materials include elastomers and additives; the elastomers are polypropylene or polyethylene or modified versions of both. The auxiliary materials include: linear materials, elastomers, tackifiers, anti-aging agents, and UV stabilizers; The proportion of raw materials used should be determined according to the required hardness of the hollow fiber mesh. If a high hardness is required, the elastomer material should account for 70-80 wt% of the total weight, and other auxiliary materials should be as follows: linear material not exceeding 20 wt%, elastomer not exceeding 5 wt%, tackifier not exceeding 5 wt%, anti-aging agent 1 wt%, and UV stabilizer 1 wt%. The total proportion of other auxiliary materials should be 20-30 wt% of the total weight. Conversely, the elastomer material needs to account for 70-80 wt%, and other auxiliary materials need to account for 20-30 wt% of the total weight; The plastic hollow pipe network is manufactured using an extrusion C-type mold, including an inner mold (5) and an outer mold (4); the inner mold (5) is fixed on the inner rotating body (7) of the die head, and the outer mold (4) is fixed on the outer rotating body (6) of the die head. The outer circumference of the inner mold (5) is provided with C-shaped discharge mesh holes (3); the inner circumference of the outer mold (4) is provided with C-shaped discharge mesh holes (3); the outer mold (4) is fixed on the outer rotating body (6) of the die head through the outer mold fixing hole (1) and screws. The mold (5) is fixed to the inner rotating body (7) of the mold head through the inner mold fixing hole (2) and screws; the inner mold (5) is fixed to the inner rotating body (7) of the mold head with screws and is positioned through the sub-port of the inner rotating body (7); when the material passes through the C-shaped discharge mesh hole (3) of the mold, the mold head is started to rotate, and the inner rotating body (7) of the mold head and the outer rotating body (6) of the mold head rotate in opposite directions through gears, and the outer mold (4) and the inner mold (5) also rotate in opposite directions at the same time, thereby forming a hollow mesh; The diameter D3 of the outer mold outlet is equal to the diameter d1 of the inner mold outlet; The diameter D4 of the C-type discharge mesh of the outer mold is equal to the diameter d4 of the C-type discharge mesh of the inner mold; The inner diameter D5 of the C-type discharge mesh of the outer mold is equal to the inner diameter d5 of the C-type discharge mesh of the inner mold.
2. A manufacturing process for the plastic hollow pipe network as described in claim 1: characterized in that, the steps are as follows:
1. Heat the materials to the normal operating temperature, i.e., heat the elastomer material and auxiliary materials to 170-220℃, and then start extrusion; Step 2: After the material passes through the mold, the die head is rotated to make the inner and outer molds rotate relative to each other. Because the mold is made into a C-shaped hole, after the material is extruded by rotation, the C-shaped hole becomes an O-shaped hole, forming a square or diamond-shaped tubular plastic mesh. Step 3: The plastic mesh tube is cooled by the cooling water in the water tank, shaped by the shaping sleeve inside the water tank, and planed and unfolded underwater. It is then pulled out from the rubber roller on the water tank. After passing through the water spraying device to remove water stains from the mesh tube, it is heated by the roller in the mold constant temperature machine. The mesh tube is dehydrated and shaped twice by the hot roller to make the surface of the mesh tube smoother, resulting in the final product.
Citation Information
Patent Citations
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