Net-clamping TPU material, forming equipment and forming process of net-clamping TPU material

Abstract

The invention discloses a net-clamping TPU material, forming equipment and a forming process thereof.The net-clamping TPU material comprises a TPU film layer, a net cloth film layer, a TPU film layer and a PP paper layer, the forming equipment comprises a rack, an unwinding device, a cooling device, a winding device, a TPU film casting extruder, a cutting device and a material distributing device, the winding device is provided with a winding roller, and the winding roller is provided with a winding roller; the unwinding device is provided with a screen cloth film placing roller, a PP paper placing roller and an unwinding frame, the cooling device is provided with two cooling rollers, a cooling forming space is formed between the two cooling rollers, the cooling device is installed on the machine frame in the mode that the size of the cooling forming space can be adjusted, and the output end of the TPU film casting extruder falls above the cooling forming space; the cutting device is provided with a material passing roller, and cutting knives are arranged above the two ends of the material passing roller in the axial direction. The material distributing device is provided with a plurality of material distributing roller sets, each material distributing roller set is provided with a separating roller and two clamping rollers, and the separating rollers are located above the two clamping rollers. Compared with the prior art, the surface of the product is smoother, and the forming process is simpler.

Description

Technical Field

[0001] The present invention relates to the technical field of TPU materials, and particularly relates to a mesh TPU material, a forming device and a forming process thereof. Background Art

[0002] TPU materials are widely used in the fields of shoes, clothing, bags, etc. TPU materials can enhance the appearance and texture of products. Generally, TPU films are extruded by a TPU film casting and extrusion machine in advance, and then the TPU films are adhered to the surface of the products by a film laminating device to improve the aesthetics and functionality of the product surface. In the prior art, such as the leather film laminating device in the application number 2020200563248, it includes an unwinding device, a sizing device, a baking device, a film laminating device, a cooling device and a winding device. The film laminating device has two film laminating rollers which are arranged up and down opposite to each other and rotatably installed on the leather film laminating device. An overfeeding gap for materials to pass through is formed between the two film laminating rollers at an interval up and down. During use, there is a leather base fabric that has been preliminarily processed and awaits film lamination on the unwinding device. The leather base fabric is sized by the sizing device, and the baking device heats the leather base fabric to a soft state and then passes it through the overfeeding gap of the film laminating device. Two film unwinding rollers for unwinding TPU films are arranged outside the film laminating rollers, and the TPU films passing through the overfeeding gap are unwound on both the upper and lower sides of the leather base fabric at the same time. The leather base fabric is located between the two TPU films. Under the action of the two film laminating rollers, the two TPU films are respectively adhered to the upper and lower surfaces of the leather base fabric, and finally, after cooling and forming, it reaches the winding device for winding.

[0003] Before film lamination, the above-mentioned film laminating device needs to extrude and wind the TPU film in advance by a TPU film casting and extrusion machine, and then adhere the TPU film to the base fabric through the film laminating roller. In this way, after the base fabric is processed, it is compounded with the TPU film. If the dust on the surface of the base fabric is not completely cleaned or the surface material of the base fabric is uneven, it is easy to cause bubbles on the TPU film on the base fabric or the TPU film cannot be smoothly adhered to the base fabric, resulting in poor flatness of the product, affecting the quality of the product, and increasing the production process and production cost.

[0004] In view of this, the inventor of this case conducted in-depth research on the problem, and thus this case was born. Summary of the Invention

[0005] The purpose of the present invention is to provide a mesh TPU material with a flat surface and good quality, as well as a forming device and a forming process that can produce high-quality products with a flat surface.

[0006] To achieve the purpose, the present invention adopts the following technical solutions:

[0007] A sandwich mesh TPU material, comprising a TPU film layer and a base fabric layer. The TPU film layer has two layers, and the base fabric layer is located between the two TPU film layers; the base fabric layer is a mesh fabric film layer, and a number of through holes that penetrate the mesh fabric film and are spaced apart are densely distributed on the mesh fabric film layer, and a PP paper layer is provided on one side of the TPU film layer facing away from the mesh fabric film layer.

[0008] In the sandwich mesh TPU material of the present invention, the mesh fabric film layer is located between the two TPU film layers. The through holes on the mesh fabric film layer can enable mutual penetration between the two TPU film layers during the composite process, making the connection between the two TPU film layers more firm. Moreover, the setting of the PP paper layer can improve the anti-slip, moisture-proof and compressive properties of the entire sandwich mesh TPU material, and also make the surface of the entire sandwich mesh TPU material flatter.

[0009] A forming device for a sandwich mesh TPU material, comprising a frame and a unwind device, a cooling device and a winding device installed on the frame. The winding device has a winding roller, and the extending direction of the winding roller is the front-back direction; it further includes a TPU film casting extruder, a dividing device and a material distributing device installed on the frame. The unwind device has a mesh fabric film placing roller for winding the mesh fabric film thereon, a PP paper placing roller for winding the PP paper thereon, and a unwind rack for detachably placing the winding roller thereon. The cooling device has two cooling rollers arranged opposite to each other horizontally. A cooling forming space is formed between the two cooling rollers, and the cooling device is installed on the frame in a manner that can adjust the size of the cooling forming space. The TPU film casting extruder has an extrusion outlet extending along the length direction of the cooling forming space. The extrusion outlet falls within the width range of the cooling forming space and is above the cooling forming space, and the length of the extrusion outlet is greater than the width of the mesh fabric film on the mesh fabric film placing roller. The winding device is outside the output end of the cooling device;

[0010] The dividing device is located between the cooling device and the winding device. The dividing device has a material passing roller for the product to pass over and a cutting knife for cutting the front and rear ends of the product flat. The cutting knives are respectively arranged above the two ends in the axial direction of the material passing roller, and there is a cutting distance between the cutting edge of the cutting knife and the material passing roller;

[0011] The material distributing device is located between the dividing device and the winding device. The material distributing device has a number of material distributing roller groups. Each material distributing roller group is arranged horizontally at intervals, and each material distributing roller group has a separating roller and two horizontally opposite clamping rollers. The separating roller is above the two clamping rollers.

[0012] The mesh fabric film placing roller is outside the upper left side of the two cooling rollers, the PP paper placing roller is outside the upper right side of the two cooling rollers, the material passing roller is outside the left side of the two cooling rollers, the winding roller is outside the left side of the material passing roller, there are two material distributing devices, and the two material distributing devices are respectively outside the front end and the rear end of the material passing roller, and the unwind rack is outside the right side of the two cooling rollers.

[0013] The mesh cloth film placing roller and the PP paper placing roller are both rotatably installed on the machine frame through placing frames. The placing frame has a mesh cloth film placing frame for the mesh cloth film placing roller to rotatably place on, and a PP paper placing frame for the PP paper placing roller to rotatably place on. The mesh cloth film placing frame is outside the left side of the two cooling rollers, the PP paper placing frame is outside the right side of the two cooling rollers, the unwinding frame is outside the right side of the PP paper placing frame, and the mesh cloth film placing frame, the PP paper placing frame and the unwinding frame all have two vertical blocks arranged at intervals in the front-rear direction. The top surface of the vertical block is concavely provided with an arc-shaped groove. A limiting rod that can extend into or out of the upper end of the arc-shaped groove is screwed at the upper end of the vertical block. The limiting rod is horizontally arranged in the left-right direction, and the top surface of the unwinding frame is higher than the top surface of the placing frame.

[0014] The two cooling rollers are divided into a left cooling roller and a right cooling roller. Left vertical blocks erected on the machine frame are provided on the front and rear sides of the left cooling roller. The left cooling roller is rotatably installed on the two left vertical blocks. Right vertical blocks slidably installed on the machine frame are erected on the front and rear sides of the right cooling roller. The right cooling roller is rotatably installed on the two right vertical blocks. A driving device extending in the left-right direction and capable of driving the right vertical block to move left and right is provided outside the right side of the right cooling roller on the machine frame.

[0015] Above the material passing roller, a horizontally arranged mounting rod parallel to the material passing roller is suspendedly installed. The two cutting knives are arranged at intervals front and back relatively, and the cutting knives are erected. The cutting edges of the cutting knives face the material passing roller. The two cutting knives are rotatably sleeved on the mounting rod in a manner that can adjust the distance between them left and right in a facing or separating direction.

[0016] The material distributing device has a material distributing frame. The material distributing frame is erected. The clamping rollers are horizontally arranged and perpendicular to the material distributing frame. The two clamping rollers are divided into a first clamping roller and a second clamping roller. The first clamping roller and the second clamping roller are arranged at a horizontal interval to form a clamping distance. The first clamping roller is rotatably sleeved on the material distributing frame. The second clamping roller is swingably installed on the material distributing frame in a manner that can move towards or away from the first clamping roller. An aggregate bucket is provided below the clamping distance, and the above-mentioned separating rollers are rotatably installed above the side of the first clamping roller facing the cutting device.

[0017] At the position of the second clamping roller on the material distributing frame, a horizontally arranged fixed rod protrudes. A lower hinge block protrudes from the top surface of the left end of the fixed rod. An upper swing block erected is hinged to the upper end of the lower hinge block. The second clamping roller is rotatably installed on the upper right side of the upper end of the upper swing block.

[0018] On the opposite side of the two material distributing frames, an introducing and separating roller is rotatably installed. The introducing and separating roller is parallel to the separating roller, and the introducing and separating roller is installed on the material distributing frame in a manner that can swing up and down along the separating roller.

[0019] A forming device for a flat screen TPU material of the present invention; compared with the prior art, the TPU film casting extruder can directly extrude the TPU film and compound it with the mesh cloth film and the PP paper, enabling the layers of the flat screen TPU material to be flatly adhered to each other, improving the flatness of the product surface, making the compound quality between the TPU film and the mesh cloth film layer better, with uniform material and high product quality; moreover, the processing is simple, the processing process is saved, and the production cost is reduced; furthermore, the setting of the material distribution device also enables the waste cut off to recycle the PP paper, with a relatively high recycling rate.

[0020] A forming process for a flat screen TPU material, comprising the following steps:

[0021] Step 1, prepare the forming device for the flat screen TPU material. A mesh cloth film is wound around the mesh cloth film placing roller, and a PP paper is wound around the PP paper placing roller. The temperature resistance of the mesh cloth film is 120°C - 180°C, and the TPU raw material is in the TPU film casting extruder.

[0022] Step 2, feeding: Place the mesh cloth film placing roller in step 1 above the left side of the two cooling rollers correspondingly, and place the PP paper placing roller in step 1 above the right side of the two cooling rollers correspondingly. Pull the ends of the mesh cloth film and the PP paper into the cooling forming distance between the two cooling rollers and pass under the material passing roller, and then pull them to the winding roller for winding. A compounding distance is formed between the mesh cloth film and the PP paper for the TPU raw material extruded by the TPU film casting extruder to be compounded inside.

[0023] Step 3, forming the first layer of TPU film: Start the PP paper placing roller, the mesh cloth film placing roller and the winding roller, and the conveying speeds of the PP paper and the mesh cloth film are 3 - 6 m / min. Then start the TPU film casting extruder. The TPU raw material in step 2 is extruded from the TPU film casting extruder and flows downward into the compounding distance. Then start the relative movement of the two cooling rollers. The TPU raw material flows into the compounding distance. The TPU raw material is between the mesh cloth film and the PP paper, and is cooled and clamped by the cooling rollers to form the first layer of TPU film. The output ends of the two cooling rollers output a preliminary formed product in which the mesh cloth film, the first layer of TPU film and the PP paper are compounded together, and the preliminary formed product is wound on the winding roller; among them, the temperature of the TPU raw material output from the output end of the TPU film casting extruder is 150°C - 180°C, the temperature of the TPU raw material between the mesh cloth film and the PP paper is 110°C - 170°C. At this time, the temperature of the TPU raw material is less than the temperature resistance of the mesh cloth film and the temperature difference between the two is 15°C - 50°C, and the relative extrusion pressure of the two cooling rollers is 0.15 Mpa - 0.45 Mpa.

[0024] Step 4, forming and cutting of the second layer of TPU film: Take down the initially formed product in a roll from Step 3 and place it on the unwind rack, and place a new winding roller at the winding device. Then pull the end of the initially formed product on the unwind rack into the cooling and forming spacing. Start the TPU film casting extruder, and the TPU raw material is extruded from the TPU film casting extruder and flows downward into the cooling and forming spacing. Then the two cooling rollers move relatively, and the TPU raw material flows onto the side of the mesh film layer of the initially formed product facing away from the first layer of TPU film. After being cooled by the cooling rollers and clamped, a second layer of TPU film is formed on the side of the mesh film layer of the initially formed product facing away from the first layer of TPU film. The output ends of the two cooling rollers output a formed product in which the second layer of TPU film, the mesh film, the first layer of TPU film, and the PP paper are laminated together. Pass the formed product output from the output ends of the two cooling rollers through the cutting spacing. When passing through the cutting spacing, two cutting knives cut off the front and rear ends of the formed product. The parts cut off from the front and rear ends of the formed product are waste strips. Separate the PP paper on the two waste strips at the front and rear ends from the waste strips. The PP paper on the waste strip passes over a separation roller and enters between two clamping rollers below the separation roller. The PP paper is output downward between the two clamping rollers. The remaining first layer of TPU film, second layer of TPU film, and mesh film on the waste strip jointly pass over another separation roller and enter between two clamping rollers below the separation roller, or the remaining first layer of TPU film, second layer of TPU film, and mesh film on the waste strip are separated respectively and each passes over other separation rollers and enters between two clamping rollers below the corresponding separation roller. The formed product passes over the top surface of the material passing roller to the new winding roller for winding into a roll of sandwich mesh TPU material with the front and rear of its first layer of TPU film, second layer of TPU film, mesh film, and PP paper flat and aligned; wherein, the temperature of the TPU raw material output from the output end of the TPU film casting extruder is 150°C - 180°C, the temperature of the TPU raw material between the mesh film and the PP paper is 110°C - 170°C. At this time, the temperature of the TPU raw material is less than the temperature resistance of the mesh film and the temperature difference between the two is 15°C - 50°C, and the relative extrusion pressure of the two cooling rollers is 0.15 Mpa - 0.45 Mpa.

[0025] Compared with the prior art, a sandwich mesh TPU material forming device and its forming process of the present invention have the following beneficial effects:

[0026] First, through the dividing device, the formed sandwich mesh TPU material can be formed into a regular sheet structure, which is more conducive to subsequent processing and forming;

[0027] Second, through the material distributing device, the PP paper on the waste strip can be recycled and reused, and the recycling rate of waste materials is high;

[0028] III. Since there are through holes in the mesh film layer and the TPU raw material extruded from the output end of the TPU film casting extruder 6 has a temperature, under the extrusion of the cooling roller, the TPU raw material is likely to penetrate into the through holes of the mesh film, thus better compounding with the mesh film to form a TPU film, which enables the mesh film layer to better adhere to the first TPU film and the second TPU film;

[0029] IV. Since the surface of the PP paper is smooth and flat, the TPU film is extruded and compounded on the surface of the PP paper through extrusion, making the adhesion between each film layer better, and also making the surface of the sandwiched mesh TPU material smoother. Moreover, the setting of the PP paper makes the moisture-proof, compressive and anti-slip properties of the entire sandwiched mesh TPU material better.

[0030] V. The TPU film is directly extruded from the output end of the TPU film casting extruder and compounded with other film layers, eliminating the need for rewinding every time the TPU film is compounded, reducing the processing flow, improving production efficiency and reducing production costs. Moreover, directly extruding and compounding the TPU film reduces the chance of the TPU film surface contacting dust, making the sandwiched mesh TPU material have better flatness. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural hierarchy diagram of the sandwiched mesh TPU material of the present invention.

[0032] Figure 2 It is a schematic structural diagram of the present invention.

[0033] Figure 3 It is a schematic structural diagram of the unwinding device, cooling device, winding device and TPU film casting extruder of the present invention.

[0034] Figure 4 It is a schematic structural diagram of the cooling device and the TPU film casting extruder of the present invention.

[0035] Figure 5 It is a schematic structural diagram of the dividing device and the material distributing device of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0036] In order to further explain the technical solution of the present invention, the following will be elaborated in detail with reference to the drawings.

[0037] A sandwiched mesh TPU material, as Figure 1As shown in the figure, it includes a TPU film layer and a base fabric layer. The TPU film layer has two layers, and the base fabric layer is located between the two TPU film layers; the base fabric layer is a mesh fabric film layer, and a number of through holes that penetrate the mesh fabric film and are spaced apart are densely arranged on the mesh fabric film layer. Moreover, a PP paper layer is provided on one side of one TPU film layer facing away from the mesh fabric film layer 13. The two TPU film layers are divided into a first TPU film layer and a second TPU film layer. The side of the first TPU film layer facing away from the mesh fabric film layer is the PP paper layer. That is, the layers of the entire mesh TPU material are sequentially divided into a PP paper layer 11, a first TPU film layer 12, a mesh fabric film layer 13, and a second TPU film layer 14.

[0038] For a mesh TPU material of the present invention, the mesh fabric film layer 13 is located between the two TPU film layers. The through holes on the mesh fabric film layer 13 can enable mutual penetration between the two TPU film layers during the composite process, making the connection between the two TPU film layers more firm. Moreover, the setting of the PP paper layer can improve the anti-slip, moisture-proof, and compressive properties of the entire mesh TPU material, and also make the surface of the entire mesh TPU material smoother.

[0039] A forming device for a mesh TPU material, as Figures 2 - 5 shown, includes a frame 2 and a unwind device, a cooling device 4, a winding device 5, a TPU film casting extruder 6, a dividing device 7, and a material distributing device installed on the frame. The winding device 5 has a winding roller. Taking the extending direction of the winding roller as the front-rear direction, the way of winding the film product by the rotation of the winding roller is a well-known technology to those skilled in the art and will not be elaborated here.

[0040] The unwinding device has a fabric film placing roller 31 for winding the fabric film thereon, a PP paper placing roller 32 for winding the PP paper thereon, and a unwinding rack 33 for detachably placing the winding roller thereon. The winding device 5 is outside the output end of the cooling device 4. Specifically, the fabric film placing roller 31 is outside the upper left side of the two cooling rollers, the PP paper placing roller 32 is outside the upper right side of the two cooling rollers, the unwinding rack 33 is outside the right side of the PP paper placing roller 32, and the winding roller is outside the left side of the fabric film placing roller 31. That is, both the fabric film placing roller 31 and the PP paper placing roller 32 are rotatably mounted on the machine frame 2 through a placing rack. The placing rack has a fabric film placing rack 311 for rotatably placing the fabric film placing roller 31 thereon and a PP paper placing rack 321 for rotatably placing the PP paper placing roller 32 thereon. The fabric film placing rack 311 is outside the left side of the two cooling rollers, the PP paper placing rack 321 is outside the right side of the two cooling rollers, and the unwinding rack 33 is outside the right side of the PP paper placing rack 321. Moreover, the fabric film placing rack 311, the PP paper placing rack 321, and the unwinding rack 33 all have two vertical blocks arranged at intervals in the front-rear direction. The top surface of the vertical block is concavely provided with an arc-shaped groove 100. A limiting rod that can extend into or out of the upper end of the arc-shaped groove 100 is screwed at the upper end of the vertical block. The limiting rod is horizontally arranged in the left-right direction. And the top surface of the unwinding rack 33 is higher than the top surface of the placing rack. The fabric film placing roller 31, the PP paper placing roller 32, and the winding roller are all circular roller bodies. And rotating rods matching the arc-shaped groove 100 are provided at both ends of the circular roller body in the front-rear direction. The limiting rod is stacked and pressed inside the rotating rod. During application, the two rotating rods of the fabric film placing roller 31 are correspondingly rotated and extended into the arc-shaped groove 100 of the fabric film placing rack 311, the two rotating rods of the PP paper placing roller 32 are correspondingly rotated and extended into the arc-shaped groove 100 of the PP paper placing rack 321, the two rotating rods of the winding roller are correspondingly rotated and extended into the arc-shaped groove 100 of the PP paper placing rack 321, and the limiting rod is moved to the right to make the top surface of the arc-shaped groove 100 in a closed state. The setting of the limiting rod makes the circular roller body not easy to shake up and down when unwinding the product.

[0041] The cooling device 4 has two cooling rollers arranged oppositely in the lateral direction, and a cooling and forming gap 200 is formed between the two cooling rollers. The cooling device 4 is installed on the frame 2 in a manner that can adjust the size of the cooling and forming gap 200. Specifically, the two cooling rollers are divided into a left cooling roller 41 and a right cooling roller 42. On the front and rear sides of the left cooling roller 41, there are left vertical blocks 411 erected on the frame 2. The left cooling roller 41 is rotatably installed on the two left vertical blocks 411. That is, there are two left vertical blocks 411, and the two left vertical blocks 411 are vertically spaced in the front-rear direction on the top surface of the frame 2. The left vertical blocks 411 are provided with rotation ports penetrating in the front-rear direction, and the front and rear end portions of the left cooling roller 41 are respectively rotatably inserted into the two rotation ports. On the front and rear sides of the right cooling roller 42, there are right vertical blocks 421 slidably installed on the frame 2. The right cooling roller 42 is rotatably installed on the two right vertical blocks 421. The way the right cooling roller 42 is rotatably installed on the right vertical blocks 421 is similar to the way the left cooling roller 41 is rotatably installed on the left vertical blocks 411. On the right side outside the right cooling roller 42 on the frame 2, there is a driving device extending in the left-right direction and capable of driving the right vertical blocks 421 to move left and right. That is, sliders are provided on the bottom surfaces of the two right vertical blocks 421, and slide rails slidably engaged with the sliders are provided at the positions corresponding to the sliders on the top surface of the frame 2. On the front end and rear end of the top surface of the frame 2 outside the right vertical blocks 421, there are respectively driving cylinders 21. The driving cylinders 21 are arranged towards the left, and the output ends of the two driving cylinders 21 are respectively connected to the two right vertical blocks 421. The two driving cylinders 21 constitute the above-mentioned driving device. During application, the driving cylinders 21 are started to drive the right vertical blocks 421 to move left and right on the slide rails, and then drive the right cooling roller 42 to move left and right. By controlling the driving cylinders 21, the right cooling roller 42 moves left and right relative to the left cooling roller 41. When the processed product enters the cooling and forming gap 200 for extrusion, the extrusion pressure of the right cooling roller 42 relative to the left cooling roller 41 can be controlled. The method of controlling the extrusion pressure of the right cooling roller 42 relative to the left cooling roller 41 by the driving cylinders is a well-known technology, and the method of cooling the product entering the cooling and forming gap 200 by the two cooling rollers is also a well-known technology, so no more details will be described here. For example, the working mode of the cooling roller with the application number 2023224638983 is similar to the cooling mode of the two cooling rollers in the present invention.

[0042] The TPU film casting and extrusion machine 6 has an extrusion port extending along the length direction of the cooling and forming spacing 200. The extrusion port falls within the width range of the cooling and forming spacing 200 and is directly above the cooling and forming spacing 200. Moreover, the length of the extrusion port is greater than the width of the mesh cloth film on the mesh cloth film placing roller 31. The manner in which the TPU film casting and extrusion machine 6 extrudes the TPU film from the extrusion port is a well-known technology and will not be elaborated here. For example, the manner of extruding the TPU film in the patent application with the application number 2020202292096 is similar to the manner in which the TPU film casting and extrusion machine 6 of the present invention extrudes the TPU film into the cooling and forming spacing 200 for forming. During application, the output end of the TPU film casting and extrusion machine 6 extrudes the TPU raw material, and under the cooling and extrusion of the two cooling rollers, a TPU film is formed within the cooling and forming spacing 200. Since the length of the extrusion port is greater than the width of the mesh cloth film on the mesh cloth film placing roller 31, after forming, the width of the TPU film can be greater than the width of the mesh cloth film.

[0043] The dividing device 7 is located between the cooling device 4 and the winding device 5. The dividing device 7 has a material passing roller 71 for the product to pass over and a cutting knife 72 for cutting the front and rear ends of the product flat. Above the two ends in the axial direction of the material passing roller 71, the above-mentioned cutting knives 72 are respectively provided. There is a cutting spacing between the cutting edge of the cutting knife 72 and the material passing roller 71. Specifically, the material passing roller 71 is located outside the left sides of the two cooling rollers, and the winding roller is located outside the left side of the material passing roller 71. Above the material passing roller 71, a horizontally arranged mounting rod 711 parallel to the material passing roller 71 is suspended and installed. The two cutting knives are arranged at intervals front and back, and the cutting knives are arranged vertically with the cutting edges facing the material passing roller. The two cutting knives 72 are rotatably sleeved on the mounting rod 711 in a manner that can adjust the distance between them left and right. That is, the mounting rod 711 is a circular rod body. The two cutting knives 72 are arranged at intervals front and back, and the cutting knife 72 is sleeved on the mounting rod 711 through a sleeving block 721. The top surface of the sleeving block 721 is recessed with a screwing port connected to the hollow chamber of the sleeving block 721. A tightening rod that abuts against the outer side wall of the mounting rod 711 is screwed and installed in the screwing port of the sleeving block 721. During application, since the PP paper may be displaced during lamination, causing the two sides of the PP paper to be misaligned and laminated with other film layers, resulting in uneven edges on both sides of the product. To ensure that the width of the product is the same, the dividing device is used to cut the front and rear ends of the finally formed product. The product output from the cooling and forming spacing 200 is in the form of a strip-shaped sheet structure and is output to the left and bypasses the top surface of the material passing roller 71. According to the required size of the product, the relative spacing distance between the two cutting knives 72 is adjusted. The lower ends of the two cutting knives 72 correspond to the front and rear positions of the top surface of the product passing over the material passing roller 71. During the process of the product passing through the cutting spacing, the two cutting knives 72 cut off the front and rear ends of the product to form waste strip one and waste strip two, and the remaining product becomes a regular square sheet and is finally wound by the winding roller.

[0044] The material dividing device is located between the dividing device 7 and the winding device 5. There are two material dividing devices, which are respectively located outside the front end and the rear end of the material passing roller 71. The material dividing device has a material dividing frame 81. There are several groups of material dividing roller groups on the material dividing frame 81. Each group of material dividing roller groups is arranged at a horizontal interval, and each group of material dividing roller groups has a separating roller 82 and two horizontally opposite clamping rollers 83. The separating roller 82 is located above the two clamping rollers 83. Specifically, the material dividing frame 81 is erected. The clamping rollers 83 and the separating roller 82 are horizontally arranged and perpendicular to the material dividing frame 81. The clamping rollers 83 are horizontally arranged in the front-back direction or the clamping rollers 83 are horizontally arranged in the left-right direction. Here, taking the clamping rollers 83 being horizontally arranged in the left-right direction as an example, the two clamping rollers 83 are divided into a first clamping roller 831 and a second clamping roller 832. The first clamping roller 831 and the second clamping roller 832 are arranged at an interval in the front-back direction to form a clamping distance. An aggregate bucket is arranged below the clamping distance. The first clamping roller 831 is rotatably sleeved on the material dividing frame 81. That is, a convex rod 811 protrudes from the position on the left side of the material dividing frame 81 corresponding to the first clamping roller 831. A through hole penetrating in the left-right direction is opened on the first clamping roller. The convex rod 811 extends out of the through hole, and a limiting block for restricting the first clamping roller from detaching from the convex rod 811 is connected to the left end of the convex rod 811. The second clamping roller 832 is swingably installed on the material dividing frame 81 in a manner that can move towards or away from the first clamping roller 831. That is, a horizontally arranged fixed rod 812 protrudes from the position below the second clamping roller 832 on the material dividing frame 81. An under hinge block protrudes upwards from the top surface of the left end of the fixed rod 812. An upper swing block erected is hinged to the upper end of the under hinge block. The second clamping roller is rotatably installed on the upper right side of the upper end of the upper swing block. That is, a horizontally arranged cross bar is locked to the upper end of the upper swing block. A through port penetrating in the left-right direction is opened on the second clamping roller. The cross bar passes through the outside of the right side of the through port, and a limiting block for restricting the second clamping roller from detaching from the cross bar is arranged at the right end of the cross bar. The separating roller 82 is rotatably installed above the side of the first clamping roller 831 facing the dividing device. During application, taking two groups of material dividing roller groups as an example, the PP paper on the waste strip one and the waste strip two is separated, and the PP paper of the product passing through the cutting distance is at the bottom surface. The PP paper of the waste strip one jointly crosses the separating roller 82 at the rear side on the front-end material dividing frame 81 and passes through the clamping distance corresponding to the lower part of the separating roller, and finally is collected by the aggregate bucket. The other film layers on the waste strip one jointly pass through the separating roller 82 at the front side on the front-end material dividing frame 81 and pass through the clamping distance corresponding to the lower part of the separating roller. Similarly, the PP paper of the waste strip two jointly crosses the separating roller 82 at the front side on the rear-end material dividing frame 81 and passes through the clamping distance corresponding to the lower part of the separating roller, and finally is collected by the aggregate bucket. The other film layers on the waste strip two jointly pass through the separating roller 82 at the rear side on the rear-end material dividing frame 81 and pass through the clamping distance corresponding to the lower part of the separating roller, and finally is collected by the aggregate bucket.Furthermore, the second clamping roller 832 can move relative to the first clamping roller, and the distance between the second clamping roller 832 and the first clamping roller 831 can be adjusted relatively, which facilitates the insertion of PP paper or other film layers into the clamping distance.

[0045] For a forming device for sandwich mesh TPU material of the present invention, during application, the ends of the mesh cloth film and the PP paper are pulled into the cooling and forming distance 200. The TPU film casting extruder 6 is started, and the extrusion outlet of the TPU film casting extruder 6 extrudes TPU raw material between the ends of the mesh cloth film and the PP paper. The right cooling roller moves leftward, and the cooling functions of the two cooling rollers are started, so that the TPU raw material is cooled and extruded to form the first layer of TPU film between the mesh cloth film and the PP paper. The output ends of the two cooling rollers output a preliminarily formed product in which the mesh cloth film, the first layer of TPU film, and the PP paper are laminated together. The preliminarily formed product output from the two cooling rollers then passes over the bottom surface of the material passing roller 71 to the winding roller for winding, and the mesh cloth film is on the outermost layer. Then, the winding roller with the preliminarily formed product is removed and placed on the unwinding rack 33 for unwinding. The right cooling roller returns to its original position, and the end of the preliminarily formed product is pulled into the cooling and forming distance 200. The TPU film casting extruder 6 is started, and the extrusion outlet of the TPU film casting extruder 6 extrudes TPU raw material onto the side of the mesh cloth film of the preliminarily formed product facing away from the first layer of TPU film. The right cooling roller moves leftward again, and the cooling functions of the two cooling rollers are started, so that the TPU raw material is cooled and extruded to form the second layer of TPU film on the outer side of the mesh cloth film. The output ends of the two cooling rollers output a formed product in which the second layer of TPU film, the mesh cloth film, the first layer of TPU film, and the PP paper are laminated together. The formed product is cut through the cutting distance to cut out waste strip one and waste strip two, and the PP paper of waste strip one and waste strip two is separated by the material separating device. The remaining formed product forms a regular formed product and is finally wound by the winding roller; compared with the prior art, the TPU film casting extruder can directly extrude the TPU film and laminate it with the mesh cloth film and the PP paper, enabling the layers of the sandwich mesh TPU material to be flatly laminated together, improving the flatness of the product surface, making the lamination quality between the TPU film and the mesh cloth film layer better, with uniform material and high product quality; moreover, the processing is simple, the processing process is saved, and the production cost is reduced; furthermore, the setting of the material separating device also enables the waste cut off to recycle the PP paper, with a relatively high recycling and reuse rate.

[0046] In the present invention, preferably, an introduction and separation roller 812 is rotatably installed on one side of the two material racks 81 facing each other. The introduction and separation roller 812 is arranged parallel to the separation roller 82, and the introduction and separation roller 812 is installed on the material rack 81 in a manner that it can swing up and down along the separation roller 82. Specifically, the introduction and separation roller 812 is horizontally arranged in the left-right direction, and a swing rod that is inclined downward and connected to the material rack is connected to the right end of the introduction and separation roller 812. The lower end of the swing rod is hinged to the material rack 81. The way the lower end of the swing rod is hinged to the material rack 81 is similar to the way the second clamping roller 832 is hinged to the upper swing block, and will not be elaborated here. During application, if the waste strip is divided into PP paper and other film layers, after the waste strip is cut, the introduction and separation roller 812 first separates the PP paper and other film layers, and then the PP paper and other film layers respectively pass over the corresponding separation roller 82, so that the waste strip separated into each layer can be conveyed more smoothly.

[0047] A forming process for a mesh TPU material includes the following steps:

[0048] Step 1, prepare the forming equipment for the mesh TPU material. A mesh fabric film is wound around the mesh fabric film placing roller 31, and PP paper is wound around the PP paper placing roller 32. The temperature resistance of the mesh fabric film is 120°C - 180°C, and the TPU raw material is in the TPU film casting extruder 6.

[0049] Step 2, feeding: Place the mesh fabric film placing roller 31 in step 1 above the left side of the two cooling rollers correspondingly, and place the PP paper placing roller 32 in step 1 above the right side of the two cooling rollers correspondingly. Pull the ends of the mesh fabric film and the PP paper to the inside of the cooling forming distance 200 between the two cooling rollers and pass under the material passing roller 71 and then pull to the winding roller for winding. A composite distance is formed between the mesh fabric film and the PP paper for the TPU raw material extruded by the TPU film casting extruder 6 to be compounded inside.

[0050] Step 3, forming the first layer of TPU film: The PP paper placing roller 32, the mesh cloth film placing roller 31 and the winding roller are started, and the conveying speeds of the PP paper and the mesh cloth film are 3 - 6 m / min. Then, the TPU film casting extruder 6 is started. The TPU raw material from Step 2 is extruded from the TPU film casting extruder 6 and flows downward to the compounding gap. After that, the relative movement of the two cooling rollers is started. The TPU raw material flows into the compounding gap. The TPU raw material is between the mesh cloth film and the PP paper, and through the cooling and clamping of the cooling rollers, a first layer of TPU film clamped between the mesh cloth film and the PP paper is formed. The initial formed product composed of the mesh cloth film, the first layer of TPU film and the PP paper is output from the output ends of the two cooling rollers and wound on the winding roller, and the driving cylinder resets. Among them, the temperature of the TPU raw material output from the output end of the TPU film casting extruder 6 is 150°C - 180°C, and the temperature of the TPU raw material between the mesh cloth film and the PP paper is 110°C - 170°C. At this time, the temperature of the TPU raw material is lower than the temperature resistance of the mesh cloth film and the temperature difference between them is 15°C - 50°C. The relative extrusion pressure of the two cooling rollers is 0.15 Mpa - 0.45 Mpa, and the relative extrusion pressure of the two cooling rollers can be controlled by the above-mentioned driving cylinder. The conveying speeds of the mesh cloth film and the PP paper can be controlled by controlling the winding speed of the winding roller, or the unwinding speeds of the mesh cloth film placing roller 31 and the PP paper placing roller 32 can be controlled to control the conveying speeds of the mesh cloth film and the PP paper. The methods of controlling the output speed of the mesh cloth film and the conveying speed of the PP paper and the method of controlling the relative extrusion pressure of the two cooling rollers are all well-known technologies and will not be elaborated here.

[0051] Step 4, forming and cutting of the second-layer TPU film: Remove the initially formed product in roll form from Step 3 and place it on the unwind rack 33. Place a new winding roller at the winding device. Then pull the end of the initially formed product on the unwind rack 33 into the cooling forming gap 200. Start the TPU film casting extruder 6. The TPU raw material is extruded from the TPU film casting extruder 6 and flows downward towards the cooling forming gap 200. Then the two cooling rollers move relative to each other. The TPU raw material flows onto the side of the mesh film layer of the initially formed product facing away from the first-layer TPU film. After being cooled by the cooling rollers and clamped, a second-layer TPU film is formed on the side of the mesh film layer of the initially formed product facing away from the first-layer TPU film. The output ends of the two cooling rollers output a formed product in which the second-layer TPU film, the mesh film, the first-layer TPU film, and the PP paper are laminated together. Pass the formed product output from the output ends of the two cooling rollers around the cutting gap. When passing through the cutting gap, the two cutting knives 72 cut off the front and rear ends of the formed product. The parts cut off from the front and rear ends of the formed product are waste strips. The waste strips on the front and rear ends are waste strip one and waste strip two respectively. At this time, waste strip one and waste strip two also have the second-layer TPU film, the mesh film, the first-layer TPU film, and the PP paper. Separate the PP paper on waste strip one and waste strip two from the waste strips. The PP paper on waste strip one passes over the rear separating roller 82 on the front material separating rack and enters between the two clamping rollers 83 corresponding to the lower part of this separating roller 82. This PP paper is output downward between the two clamping rollers 83. The remaining first-layer TPU film, second-layer TPU film, and mesh film on waste strip one jointly pass over the front separating roller 82 on the front material separating rack and enter between the two clamping rollers 83 corresponding to the lower part of this separating roller 82. At this time, there are two groups of separating roller sets on one material separating rack, or the remaining first-layer TPU film, second-layer TPU film, and mesh film on waste strip one are separated respectively and pass over other separating rollers 82 on the front material separating rack one by one and enter between the two clamping rollers 83 corresponding to the lower part of the corresponding separating roller 82. At this time, there are four groups of separating roller sets on the front material separating rack; Similarly, the PP paper on waste strip two passes over the front separating roller 82 on the rear material separating rack and enters between the two clamping rollers 83 corresponding to the lower part of this separating roller 82. This PP paper is output downward between the two clamping rollers 83. The remaining first-layer TPU film, second-layer TPU film, and mesh film on waste strip two jointly pass over the rear separating roller 82 on the rear material separating rack and enter between the two clamping rollers 83 corresponding to the lower part of this separating roller 82;Alternatively, the remaining first-layer TPU film, second-layer TPU film, and mesh film on the second waste strip are separated one by one, pass over other separating rollers 82 on the rear-end material distributing rack, and enter between two clamping rollers 83 below the corresponding separating rollers 82. At this time, there are four groups of material distributing roller sets on the rear-end material distributing rack, and the remaining formed products form regular formed products that pass over the top surface of the material passing roller 71 to the winding roller for winding into a roll of clamped mesh TPU material with the first-layer TPU film, second-layer TPU film, mesh film, and PP paper aligned neatly front and back. The winding speed of the winding roller is 3 - 6 m / min; among them, the temperature of the TPU raw material output from the output end of the TPU film casting extruder 6 is 150°C - 180°C, and the temperature of the TPU raw material between the mesh film and the PP paper is 110°C - 170°C. At this time, the temperature of the TPU raw material is lower than the temperature resistance of the mesh film, and the temperature difference between the two is 15°C - 50°C. The relative extrusion pressure of the two cooling rollers is 0.15 Mpa - 0.45 Mpa.

[0052] Compared with the prior art, a clamped mesh TPU material forming device and its forming process of the present invention have the following beneficial effects:

[0053] First, through the dividing device, the formed clamped mesh TPU material can be formed into a regular sheet structure, which is more conducive to subsequent processing and forming;

[0054] Second, through the material distributing device, the PP paper on the waste strip can be recycled and reused, and the recycling rate of waste materials is high;

[0055] Third, since there are through holes in the mesh film layer and the TPU raw material extruded from the output end of the TPU film casting extruder 6 has a temperature, under the extrusion of the cooling rollers, the TPU raw material easily penetrates into the through holes of the mesh film, so as to better composite with the mesh film to form a TPU film, thus enabling the mesh film layer to better adhere to the first TPU film and the second TPU film;

[0056] Fourth, due to the smooth and flat surface of the PP paper, the TPU film is extruded and laminated on the surface of the PP paper, making the adhesion between each film layer better, and also making the surface of the clamped mesh TPU material smoother. Moreover, the setting of the PP paper makes the moisture-proof, compressive, and anti-slip properties of the entire clamped mesh TPU material better.

[0057] Fifth, the TPU film is directly extruded from the output end of the TPU film casting extruder and laminated with other film layers, without the need for winding each time when laminating the TPU film, reducing the processing process, improving production efficiency, and reducing production costs; moreover, directly extruding and laminating the TPU film reduces the chance of the TPU film surface contacting dust, making the product flatness better.

[0058] The product form of the present invention is not limited to the illustrations and embodiments in this case. Any person's appropriate changes or modifications with a similar idea should be regarded as not departing from the patent scope of the present invention.

Claims

1. A double-web TPU material, comprising a TPU film layer and a base fabric layer. The TPU film layer has two layers, and the base fabric layer is located between the two TPU film layers; characterized in that: The base fabric layer is a mesh fabric film layer. A number of through holes that penetrate the mesh fabric film and are arranged at intervals are densely distributed on the mesh fabric film layer. And a PP paper layer is provided on one side of the TPU film layer facing away from the mesh fabric film layer.

2. A forming device for a flat-fabric TPU material, comprising a frame and a unwinding device, a cooling device and a winding device mounted on the frame, the winding device having a winding roller, with the extending direction of the winding roller being the front-back direction; characterized in that: It further includes a TPU film casting and extrusion machine, a splitting device and a material distributing device installed on a frame. The unwinding device has a mesh fabric placing roller for winding the mesh fabric thereon, a PP paper placing roller for winding the PP paper thereon, and an unwinding rack for detachably placing the winding roller thereon. The cooling device has two cooling rollers arranged oppositely horizontally. A cooling and forming space is formed between the two cooling rollers. And the cooling device is installed on the frame in a manner that can adjust the size of the cooling and forming space. The TPU film casting and extrusion machine has an extrusion port extending along the length direction of the cooling and forming space. The extrusion port falls within the width range of the cooling and forming space and is above the cooling and forming space. And the length of the extrusion port is greater than the width of the mesh fabric on the mesh fabric placing roller. The winding device is outside the output end of the cooling device. The unwinding rack is outside one side of the two cooling rollers. The splitting device is between the cooling device and the winding device. The splitting device has a material passing roller for the product to pass over and a cutter for cutting the front and rear ends of the product flat. The cutters are respectively arranged above the two ends in the axial direction of the material passing roller. There is a cutting space between the cutting edge of the cutter and the material passing roller. The material distributing device is between the splitting device and the winding device. The material distributing device has a number of material distributing roller groups. Each material distributing roller group is arranged horizontally at intervals. And each material distributing roller group has a separating roller and two horizontally opposite clamping rollers. The separating roller is above the two clamping rollers.

3. The forming device for a flat-fabric TPU material according to claim 2, characterized in that: The mesh fabric placing roller is outside the upper left side of the two cooling rollers. The PP paper placing roller is outside the upper right side of the two cooling rollers. The material passing roller is outside the left side of the two cooling rollers. The winding roller is outside the left side of the material passing roller. There are two material distributing devices. The two material distributing devices are respectively outside the front end and the rear end of the material passing roller. The unwinding rack is outside the right side of the two cooling rollers.

4. The forming device for a flat screen TPU material according to claim 3, characterized in that: Both the mesh fabric placing roller and the PP paper placing roller are rotatably installed on the frame through placing frames. The placing frame has a mesh fabric placing frame for rotatably placing the mesh fabric placing roller thereon and a PP paper placing frame for rotatably placing the PP paper placing roller thereon. The mesh fabric placing frame is outside the left side of the two cooling rollers. The PP paper placing frame is outside the right side of the two cooling rollers. The unwinding rack is outside the right side of the PP paper placing frame. And both the mesh fabric placing frame, the PP paper placing frame and the unwinding rack have two vertical blocks arranged at intervals in the front-rear direction. An arc-shaped groove is recessed on the top surface of the vertical block. A limiting rod that can extend into or out of the upper end of the arc-shaped groove is screwed at the upper end of the vertical block. The limiting rod is horizontally arranged in the left-right direction. And the top surface of the unwinding rack is higher than the top surface of the placing frame.

5. The forming device for a flat-fabric TPU material according to claim 3, characterized in that: The two cooling rollers are divided into a left cooling roller and a right cooling roller. Left vertical blocks vertically arranged on the frame are provided on the front and rear sides of the left cooling roller, and the left cooling roller is rotatably installed on the two left vertical blocks. Right vertical blocks slidably installed on the frame are vertically arranged on the front and rear sides of the right cooling roller, and the right cooling roller is rotatably installed on the two right vertical blocks. A driving device extending in the left-right direction and capable of driving the right vertical block to move left and right is provided outside the right side of the right cooling roller on the frame.

6. The forming device for a flat-fabric TPU material according to claim 3, wherein: Above the material passing roller, a mounting rod horizontally arranged and parallel to the material passing roller is suspended and installed. Two cutting knives are arranged at intervals front and back relatively, and the cutting knives are vertically arranged with the cutting edges facing the material passing roller. The two cutting knives are rotatably sleeved on the mounting rod in a manner that the distance between them can be adjusted to move towards or away from each other left and right.

7. The forming device for the double - wire TPU material according to claim 3, characterized in that: The material distributing device has a material distributing frame which is vertically arranged. The clamping rollers are horizontally arranged and perpendicular to the material distributing frame. The two clamping rollers are divided into a first clamping roller and a second clamping roller. The first clamping roller and the second clamping roller are arranged at a horizontal interval to form a clamping distance. The first clamping roller is rotatably sleeved on the material distributing frame, and the second clamping roller is swingably installed on the material distributing frame in a manner that it can move towards or away from the first clamping roller. An aggregate bucket is provided below the clamping distance, and the above-mentioned separating rollers are rotatably installed above one side of the first clamping roller facing the cutting device.

8. The forming device for a flat-fabric TPU material according to claim 7, characterized in that: At the position of the second clamping roller on the material distributing frame, a horizontally arranged fixed rod protrudes. On the top surface of the left end of the fixed rod, a lower hinge block protrudes. An upper swing block vertically arranged is hinged to the upper end of the lower hinge block, and the second clamping roller is rotatably installed on the upper right side of the upper end of the upper swing block.

9. The forming device for the flat-fabric TPU material according to claim 8, characterized in that: On the opposite sides of the two material distributing frames, an introducing and separating roller is rotatably installed. The introducing and separating roller is parallel to the separating roller, and the introducing and separating roller is installed on the material distributing frame in a manner that it can swing up and down along the separating roller.

10. A forming process for a flat-fabric TPU material, characterized in that: Including the following steps: Step 1, prepare the forming equipment for the sandwiched TPU material according to any one of claims 2-9. A mesh cloth film is wound on the mesh cloth film placing roller, and a PP paper is wound on the PP paper placing roller. The temperature resistance of the mesh cloth film is 120°C - 180°C, and the TPU raw material is in the TPU film casting extruder. Step 2, feeding: Place the mesh cloth film placing roller in step 1 above the left side of the two cooling rollers correspondingly, and place the PP paper placing roller in step 1 above the right side of the two cooling rollers correspondingly. Pull the ends of the mesh cloth film and the PP paper into the cooling forming distance between the two cooling rollers, pass under the material passing roller, and then pull them to the take-up roller for winding. A composite distance for the TPU raw material extruded by the TPU film casting extruder to be compounded therein is formed between the mesh cloth film and the PP paper. Step 3, forming the first layer of TPU film: The PP paper placing roller, the mesh cloth film placing roller, and the winding roller are started, and the conveying speeds of the PP paper and the mesh cloth film are 3 - 6 m / min. Then the TPU film casting extruder is started, and the TPU raw material in Step 2 is extruded from the TPU film casting extruder and flows downward to the compounding gap. Then the relative movement of the two cooling rollers is started. The TPU raw material flows into the compounding gap, and the TPU raw material is between the mesh cloth film and the PP paper, and forms the first layer of TPU film through the cooling and clamping of the cooling rollers. The initial formed product composed of the mesh cloth film, the first layer of TPU film, and the PP paper is output from the output ends of the two cooling rollers and wound on the winding roller; among them, the temperature of the TPU raw material output from the output end of the TPU film casting extruder is 150°C - 180°C, the temperature of the TPU raw material between the mesh cloth film and the PP paper is 110°C - 170°C. At this time, the temperature of the TPU raw material is lower than the temperature resistance of the mesh cloth film and the temperature difference between the two is 15°C - 50°C, and the relative extrusion pressure of the two cooling rollers is 0.15 Mpa - 0.45 Mpa; Step 4, forming and cutting of the second layer of TPU film: Remove the initially formed product in a roll from Step 3 and place it on the unwinding rack, and place a new winding roll at the winding device. Then, pull the end of the initially formed product on the unwinding rack into the cooling and forming spacing. Start the TPU film casting and extrusion machine. The TPU raw material is extruded from the TPU film casting and extrusion machine and flows downward into the cooling and forming spacing. Then, the two cooling rolls move relative to each other. The TPU raw material flows onto the side of the mesh fabric film layer of the initially formed product facing away from the first layer of TPU film. After being cooled by the cooling rolls and clamped, a second layer of TPU film is formed on the side of the mesh fabric film layer of the initially formed product facing away from the first layer of TPU film. The output ends of the two cooling rolls output a formed product in which the second layer of TPU film, the mesh fabric film, the first layer of TPU film, and the PP paper are laminated together. Pass the formed product output from the output ends of the two cooling rolls through the cutting spacing. When passing through the cutting spacing, two cutting knives cut off the front and rear ends of the formed product. The parts cut off from the front and rear ends of the formed product are waste strips. Separate the PP paper on the two waste strips at the front and rear ends from the waste strips. The PP paper on the waste strips passes over a separation roll and enters between two clamping rolls below the separation roll. The PP paper is output downward between the two clamping rolls. The remaining first layer of TPU film, second layer of TPU film, and mesh fabric film on the waste strips jointly pass over another separation roll and enter between two clamping rolls below the separation roll, or the remaining first layer of TPU film, second layer of TPU film, and mesh fabric film on the waste strips are separated respectively and each passes over other separation rolls and enters between two clamping rolls below the corresponding separation roll. The formed product passes over the top surface of the feeding roll to the new winding roll for winding into a roll of sandwich TPU material with the front and rear of its first layer of TPU film, second layer of TPU film, mesh fabric film, and PP paper flat and aligned; wherein, the temperature of the TPU raw material output from the output end of the TPU film casting and extrusion machine is 150°C - 180°C, the temperature of the TPU raw material between the mesh fabric film and the PP paper is 110°C - 170°C. At this time, the temperature of the TPU raw material is less than the temperature resistance of the mesh fabric film and the temperature difference between the two is 15°C - 50°C. The relative extrusion pressure of the two cooling rolls is 0.15 Mpa - 0.45 Mpa.

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