Preparation device and preparation process of TPEE three-layer co-extrusion polyester light-shielding film

Abstract

This invention belongs to the technical field of light-blocking film preparation, specifically relating to a preparation device and process for a TPEE three-layer co-extruded polyester light-blocking film. The production line includes an edge-cutting and edge-recovering process where, during the current edge-cutting and edge-recovering process, the edge material is crushed by an edge-cutting crusher and then fed into hopper B by a fan, thus recycling the edge material online. This ensures the flatness after winding, controls constant tension, solves the problem of elastic shrinkage and wrinkling, and ensures the stability of edge material transport. The TPEE three-layer co-extruded light-blocking film uses a fabric-plastic composite material made by combining TPEE hot melt adhesive with polyester woven fabric and polyester non-woven fabric adhesive, ensuring the compatibility of the fabric and plastic. This lays the foundation for post-use recycling, reuse, energy conservation, environmental protection, and carbon emission reduction. Furthermore, the resulting TPEE fabric-plastic composite material can be used in roller blinds, soft curtains, folding curtains, honeycomb blinds, and light-blocking and sun-shading fabric-plastic composite materials, making a significant contribution to energy conservation and environmental protection.

Description

Technical Field

[0001] This invention belongs to the technical field of light-shielding film preparation, specifically relating to a preparation device and process for a TPEE three-layer co-extruded polyester light-shielding film. Background Technology

[0002] The material properties of TPEE three-layer co-extruded polyester light-blocking film are compatible with PET polyester fabric and chemical fiber polyester cloth, solving the problem of 100% recycling, granulation, and reuse of fabric-plastic composite materials after disposal. This saves a significant amount of original PET raw materials, greatly reducing carbon emissions while conserving virgin materials. The black layer of the three-layer co-extruded film achieves 100% light blocking and UV protection, reducing indoor temperature for greater comfort, lowering air conditioner compressor operating frequency, and saving on household electricity costs. This lightweight light-blocking film differs from traditional PU-coated light-blocking films. Compared to curtains and PVC coated blackout films, it uses only one-fifth of the material, significantly saving petrochemical raw materials. Compared to the coating process, it saves a lot of energy. The equipment installation only requires a 150-square-meter factory. A three-layer co-extrusion film production line consumes only 100 kilowatts per hour and can produce more than 2,000 meters of film per hour. It is more than twice as efficient as the traditional PU and PVC coating process. It is formed in one step. The coating process for blackout fabric requires a black base layer first, followed by a colored layer, which requires at least two repeated processes. Its efficiency cannot be compared with that of the co-extrusion equipment.

[0003] The material application is as follows: the main raw material and polyolefin modified color masterbatch are mixed and used. It is efficient and simple, and color masterbatch of various colors can be prepared according to different color requirements. The carrier is designed to correspond to the TPEE main material, with good compatibility, strong coloring power, and stable and reliable film formation.

[0004] The resulting rolled co-extruded blackout film uses a low-temperature, high-flow TPEE adhesive combined with polyester fabric, ensuring the compatibility of the three materials: fabric, film, and adhesive. This lays the foundation for subsequent end-use waste gas recycling and regeneration, achieving the goals of 100% recycling, energy conservation, and emission reduction. The TPEE three-layer co-extruded polyester blackout film can also be used in everyday home and travel products such as fabric-plastic composite curtains, fabric-plastic composite roller blinds, fabric-plastic composite honeycomb blinds, fabric-plastic composite blackout fabrics, camping tents, and parasols. Based on the high breathability and moisture permeability of TPEE material, it can also be applied to smart wearable products, including down jackets, military and police uniforms, and breathable and moisture-permeable raincoats. The TPEE three-layer co-extruded film incorporates graphene antibacterial, bacteriostatic, mildew-proof, and anti-mite mother liquor, further ensuring the safety, environmental friendliness, comfort, double-sided film, and multi-functional efficiency of the product. Official testing has fully met the expected goals.

[0005] Based on TPEE (polyester polyether thermoplastic elastomer) materials, this invention is compatible with PET and PBT polyester fiber fabrics, achieving 100% recyclability and resulting in energy saving, reduced consumption, and emission reduction. Due to its high and low temperature resistance, its rigidity without cracking, and its softness, it can be applied to various home furnishing products such as honeycomb blinds, roller blinds, and fabric-plastic composite curtains that provide heat insulation, light blocking, and UV protection. TPEE materials can also be designed for high breathability and moisture permeability, making it suitable for smart wearable devices. Its superior anti-aging properties ensure durability. The light-blocking, breathable, and moisture-permeable membrane features a three-layer co-extrusion structure: a light-blocking layer at the bottom and a coloring layer at the top, allowing for various colors. Only 15 grams of color masterbatch are needed per square meter, saving material usage and making it lightweight and inexpensive. Incorporating graphene functional masterbatch enables long-term antibacterial, antifungal, and far-reaching negative ion release, creating a multi-functional membrane.

[0006] In the preparation of light-shielding film, the edges need to be trimmed and collected. Currently, the trimmed edges need to be reused to save energy and reduce emissions. Therefore, special attention needs to be paid to the transfer of the trimmed edges, because due to tension issues, the trimmed edges may fall off the guide rollers when entering the crusher. This phenomenon has become a problem that urgently needs to be solved by those in the field. Summary of the Invention

[0007] The purpose of this invention is to provide an apparatus and process for preparing a TPEE three-layer co-extruded polyester light-shielding film, so as to solve the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a preparation device and process for a TPEE three-layer co-extruded polyester light-shielding film, comprising a preparation production line arranged in a straight line, including a chilled water unit, a one-to-three dehumidification and vacuum drying unit, three hoppers (A, B, and C), three sets of screws, a distributor, a mold, a rubber roller section, a patterned roller section, a peeling roller section, a base plate, a corona generator, a traction trimming roller section, an edge-receiving crusher, a flattening olive roller, a constant tensioner, and a winding and changing section. Raw materials with different properties from the three sets of screws are fed into a specially designed extrusion mold through the distributor to produce film. The one-to-three dehumidification and vacuum drying unit is connected to the three hoppers (A, B, and C) by pipes. The chilled water unit is connected to the rubber roller section by pipes, with two pipes, one for water inlet and the other for water outlet. The edge-receiving crusher is located on one side of the traction trimming roller section and is used for trimming and crushing edge material. The edge-receiving crusher is connected to hopper B by a crushing material air duct.

[0009] The present invention further explains that the preparation process includes the following steps: Step S1: The equipment is arranged in a straight line. Pre-prepared modified TPEE raw materials are circulated through a three-way dehumidification and vacuum drying unit, corresponding to three extruders. The materials are automatically fed into the three extruders and continuously dried using the three-way dehumidification and vacuum drying unit. Then, the materials are continuously and quantitatively fed into three hoppers (A, B, and C) in real time. Step S2: The material enters the screw and is heated to the required processing temperature by the screw. Then, it is extruded, with three layers co-extruded corresponding to the screw: the middle and bottom layers are light-shielding layers, and the top layer is a coloring layer. Step S3: The chilled water unit introduces cooling water into the stripping roller. The extruded material enters the mold and rubber roller section. The chilled water unit uses a three-way configuration to introduce cooling water into the stripping roller section, the patterned roller section, and the rubber roller section. Step S4: The material is introduced into the traction trimming roller section via a corona machine for further processing, while simultaneously trimming the edges. The edge material is then crushed by an edge crusher and returned to hopper B via a pneumatic conveying system and a crushed material duct. After being flattened by a constant tension device and a flattening olive roller, it enters the winding and changing section for automatic meter counting and film cutting. Step S5: The material is rolled up, unwound, packaged, placed on shelves, and stored. Step S6: After the co-extruded film is prepared, a TPEE hot melt adhesive fabric-plastic composite equipment is installed. At the same time, the pre-woven and dyed PET polyester fabric is placed on a constant tension fabric spreading frame. After applying adhesive through an adhesive mold, it is laminated with the constant tension film, flattened, and rolled up to form a multifunctional fabric-plastic composite fabric. This achieves the goal of 100% recyclability, crushing, granulation, and regeneration after use, making it energy-saving and environmentally friendly.

[0010] The present invention further explains that the traction trimming roller section in step S4 includes two bases, roller one, roller two, roller three, a cutter, two guide wheels, and a tension chamber. The edge-collecting crusher is equipped with a take-up shaft, and the cut material is collected into the edge-collecting crusher through the two guide wheels and the take-up shaft. Rollers one, two, and three are all axially connected between the two bases. Rollers two and three are arranged vertically opposite each other and press against the light-shielding film. Roller one is located to the left of roller three, and the light-shielding film is located on the surface of roller one. The cutter is fixedly installed between the two bases and located above roller one. The tension chamber is fixedly installed above one of the bases and located on the right side of roller three. One of the guide wheel bearings is installed above the front base, and the bottom bearing of the other guide wheel is installed on the connecting shaft. The lower end of the connecting shaft is fixed with a telescopic joint, and the lower end of the telescopic joint is fixedly connected with a connecting rod. The bottom end of the connecting rod is fixed with a slider. The bottom of the inner wall of the tension chamber is fixed with a slide rail and a motor. The slider is slidably connected to the inner wall of the slide rail. The output end of the motor is fixedly connected with a gear. A toothed plate is fixed on one side of the connecting rod, and the toothed plate and the gear mesh with each other.

[0011] The present invention further illustrates that an arc ball is fixed on one side of the connecting shaft, a guide block is fixed on the right side of the inner wall of the tension cavity, a guide rod is slidably connected to the inner wall of the guide block, a fixing rod is fixed at the left end of the guide rod, six extrusion balls are evenly fixed on one side of the fixing rod, and a spring is fixed between the right side of the fixing rod and the right side of the inner wall of the tension cavity; after the connecting shaft moves, the arc ball and the extrusion balls come into contact with each other.

[0012] The present invention further illustrates that the expansion joint is elastic.

[0013] The present invention further illustrates that a threaded hole is provided on the right side of the tension cavity, and a threaded rod is threadedly connected to the threaded hole; in the initial state, there is a gap between the left end of the threaded rod and the right side of the fixed rod, and both the left end of the threaded rod and the right side of the fixed rod are magnetic and have the same magnetic poles, and the spring is sleeved on the outside of the threaded rod.

[0014] The present invention further explains that the motor rotates in the following manner: it rotates clockwise N times and then counterclockwise N times.

[0015] The present invention further explains that the number of clockwise and counterclockwise rotations N of the motor includes five and ten. When the number of clockwise and counterclockwise rotations N of the motor is ten, the threaded rod rotates slightly. When the number of clockwise and counterclockwise alternating rotations N of the motor is five, the threaded rod rotates significantly, and the initial position of the arc ball is located in the middle of the six extrusion balls.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention moves the guide wheel to the right, which pushes the cutting material to the right, thereby stretching the cutting material. This avoids the phenomenon of material jamming and detachment during the winding process due to loosening and low tension. After stretching the cutting material, the motor rotates counterclockwise to release the cutting material again. This repeated tightening and loosening of the cutting material ensures proper tension. On the one hand, it can ensure smooth operation of the winding process, and on the other hand, it can prevent the cutting material from breaking due to continuous tension. Moreover, the faster the winding and cutting speed of the edge-shrinking crusher, the more times the motor rotates clockwise and counterclockwise. At this time, the winding speed is fast and the cutting speed is also fast. In order to ensure that the cutting material enters the edge-shrinking crusher smoothly, the tension force on the cutting material is increased, which fully prevents the cutting material from detaching from the guide wheel.

[0017] During the movement of the connecting shaft to the right, the arc ball moves. When the arc ball comes into contact with the extrusion ball, the extrusion ball is subjected to force, which pushes the spring through the fixed rod to deform. The guide rod slides inside the guide block, and the reaction force generated by the spring applies force to the arc ball. This can prevent the edge material from breaking due to excessive speed of the connecting shaft, thus affecting the conveying of the edge material and improving the conveying stability. When the arc ball and the extrusion ball come into contact and squeeze each other, the connecting shaft is subjected to force, and the arc ball is pressed above the extrusion ball, as shown in the figure. The telescopic joint is stretched and deformed, which causes the guide wheel to move upward slightly. Then the arc ball reaches between the two extrusion balls and is elastically reset by the telescopic joint, which causes the guide wheel to bounce up and down slightly. When the guide wheel is conveying the cutting material, when the cutting material leaves the limiting groove, it can be bounced back into the limiting groove, so that the cutting material is always in the limiting groove, maintaining the guiding ability of the cutting material and improving the cutting material conveying efficiency. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the production line for the light-shielding film preparation process of the present invention;

[0020] Figure 2 This is a structural schematic diagram of the traction trimming roller section of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of the expansion cavity of the present invention;

[0022] Figure 4 This is a plan view of the expansion cavity of the present invention;

[0023] Figure 5 This is a schematic diagram showing the positional relationship between the extruded ball and the arc ball after the connecting shaft of the present invention has moved;

[0024] Figure 6 This is a schematic diagram showing the positional relationship between the internal structures of the expansion cavity of the present invention;

[0025] Figure 7 This is a schematic diagram showing the positional relationship between the extruded ball and the arc ball in Embodiment 2 of the present invention;

[0026] Figure 8 This is a schematic diagram showing the positional relationship between the extruded ball and the arc ball in Embodiment 3 of the present invention;

[0027] In the diagram: 1. Base; 2. Roller 1; 3. Roller 2; 4. Roller 3; 5. Cutter; 6. Guide wheel; 61. Connecting shaft; 611. Arc ball; 62. Expansion joint; 63. Connecting rod; 631. Toothed plate; 64. Slider; 7. Tension chamber; 71. Slide rail; 72. Motor; 721. Gear; 73. Guide block; 731. Guide rod; 732. Fixed rod; 733. Extrusion ball; 74. Spring; 75. Threaded rod; 8. Limiting groove. Detailed Implementation

[0028] The following detailed, non-limiting description of the technical solution of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] Please see Figures 1-8 The present invention provides a technical solution: a preparation device and preparation process for a TPEE three-layer co-extruded polyester light-shielding film, including a preparation production line, which is arranged in a straight line and includes a chilled water unit, a one-to-three dehumidification and vacuum drying unit, three hoppers (A, B, and C), three sets of screws, a distributor, a mold, a rubber roller section, a patterned roller section, a peeling roller section, a base plate, a corona machine, a traction trimming roller section, an edge crushing machine, a flattening olive roller, a constant tensioner, and a winding and changing section. Raw materials with different properties from the three sets of screws are fed into a specially designed extrusion mold through the distributor to produce film.

[0030] The three-in-one dehumidification vacuum dryer unit is connected to the pipes of the three hoppers A, B, and C. The chilled water unit is connected to the pipes of the rubber roller section, and there are two pipes, one for water inlet and the other for water outlet. The edge-receiving crusher is located on one side of the traction cutting roller section and is used for cutting and receiving edges and crushing edge materials. The edge-receiving crusher is connected to the B hopper by a crushing material air pipe.

[0031] The preparation process includes the following steps:

[0032] Step S1: The equipment is arranged in a straight line. The pre-made modified raw material of TPEE is circulated through the three-way dehumidification and vacuum drying unit, corresponding to three sets of extruders. The material is automatically sucked in and fed through the three-way dehumidification and vacuum drying unit. Then, it is continuously fed into the three hoppers A, B, and C in real time and quantitatively.

[0033] Step S2: The material is fed into the screw and heated to the required processing temperature by the screw. Then it is extruded, and three layers are co-extruded corresponding to the screw. The middle and bottom layers are light-shielding layers, and the top layer is a coloring layer.

[0034] Step S3: The chilled water unit introduces cooling water into the stripping roller, and the extruded material enters the mold and rubber roller step surface. The chilled water unit adopts a one-to-three configuration to introduce cooling water into the stripping roller section, and the patterned roller section and the rubber roller section are pressed against each other.

[0035] Step S4: The material is introduced into the traction cutting roller section through the corona machine for the next section. At the same time, the edge is cut. The edge material is crushed by the edge crusher and then sent back to the B hopper through the air conveying system and the crushed material air duct. After being flattened by the constant tensioner and the flattening olive roller, it enters the winding and changing section for automatic meter counting and automatic film cutting.

[0036] Step S5: Rolling, unwinding, packaging, placing on shelves, and warehousing;

[0037] Step S6: After the co-extruded film is prepared, a TPEE hot melt adhesive fabric-plastic composite equipment is set up. At the same time, the pre-woven and dyed PET polyester fabric is placed on the constant tension fabric spreading frame. After being glued through the glue application mold, it is laminated with the constant tension film, flattened and rolled up to form a multifunctional fabric-plastic composite fabric. This achieves the goal of 100% recyclability, crushing and granulation after use, which is energy-saving and environmentally friendly.

[0038] The traction cutting roller section in step S4 includes two bases 1, roller one 2, roller two 3, roller three 4, cutter 5, two guide wheels 6 and tension chamber 7. The edge crusher is equipped with a winding shaft, and the cut material is collected into the edge crusher through the two guide wheels 6 and the winding shaft.

[0039] Rollers 1 (2), 2 (3), and 3 (4) are all axially connected between two bases 1. Rollers 2 (3) and 3 (4) are arranged vertically opposite each other and press against the light-shielding film. Roller 1 (2) is located to the left of roller 3 (4), and the light-shielding film is located on the surface of roller 1 (2). The cutter 5 is fixedly installed between the two bases 1 and above roller 1 (2). The tension chamber 7 is fixedly installed above one of the bases 1 and to the right of roller 3 (4). One guide wheel 6 is bearing-mounted above the front base 1, and the other guide wheel 6... The bottom bearing is installed on the connecting shaft 61. The lower end of the connecting shaft 61 is fixed with a telescopic joint 62. The lower end of the telescopic joint 62 is fixedly connected to the connecting rod 63. The bottom end of the connecting rod 63 is fixed with a slider 64. The bottom of the inner wall of the tension chamber 7 is fixed with a slide rail 71 and a motor 72. The slider 64 is slidably connected to the inner wall of the slide rail 71. The output end of the motor 72 is fixedly connected with a gear 721. A toothed plate 631 is fixed on one side of the connecting rod 63, and the toothed plate 631 and the gear 721 mesh with each other.

[0040] The cut material enters the right side of the rear guide wheel 6 through the right side of the front guide wheel 6, and then enters the edge crusher through the surface of the winding shaft to crush the edge material. When winding the cut material, the motor 72 first rotates clockwise, driving the gear 721 to rotate clockwise. Through meshing with the toothed plate 631, the gear 721 drives the connecting rod 63 to move to the right. The connecting rod 63 moves to the right along the slide rail 71 through the slider 64, thereby driving the guide wheel 6 to move to the right through the telescopic joint 62 and the connecting shaft 61, pressing the cut material to the right, thus stretching the cut material. This prevents the material from getting stuck or falling off during winding due to loose tension. After stretching the cut material, the motor 72 rotates counterclockwise to release the cut material again. This repeated tightening and loosening of the cut material ensures a smooth winding process and prevents the material from breaking due to continuous tension.

[0041] A circular arc ball 611 is fixed on one side of the connecting shaft 61, a guide block 73 is fixed on the right side of the inner wall of the tension cavity 7, a guide rod 731 is slidably connected to the inner wall of the guide block 73, a fixing rod 732 is fixed on the left end of the guide rod 731, six extrusion balls 733 are evenly fixed on one side of the fixing rod 732, and a spring 74 is fixed between the right side of the fixing rod 732 and the right side of the inner wall of the tension cavity 7.

[0042] After the connecting shaft 61 moves, the arc ball 611 and the extruded ball 733 come into contact with each other;

[0043] As the connecting shaft 61 moves to the right, it drives the arc ball 611 to move. When the arc ball 611 moves to contact the extrusion ball 733, the extrusion ball 733 is subjected to force and pushes the spring 74 to deform through the fixed rod 732. The guide rod 731 slides inside the guide block 73. Through the reaction force generated by the spring 74, a force is applied to the arc ball 611, thereby avoiding the edge material from breaking due to the excessive speed of the connecting shaft 61, which affects the conveying of the edge material and improves the conveying stability.

[0044] Expansion joint 62 is elastic;

[0045] Example 1:

[0046] When the arc-shaped sphere 611 and the extrusion sphere 733 come into contact and compress each other, the connecting shaft 61 is subjected to force, and at the same time, the arc-shaped sphere 611 is pressed above the extrusion sphere 733, as... Figure 5 As shown, the telescopic joint 62 is stretched and deformed, causing the guide wheel 6 to move upward slightly. Then, the arc ball 611 reaches between the two extrusion balls 733 and is elastically reset by the telescopic joint 62, causing the guide wheel 6 to bounce up and down slightly. When the guide wheel 6 is conveying the cutting material, if the cutting material leaves the limiting groove 8, it can bounce back into the limiting groove 8, so that the cutting material is always in the limiting groove 8, maintaining the guiding ability of the cutting material and improving the cutting material conveying efficiency.

[0047] A threaded hole is provided on the right side of the tension chamber 7, and a threaded rod 75 is threadedly connected inside the threaded hole;

[0048] In the initial state, there is a gap between the left end of the threaded rod 75 and the right side of the fixed rod 732, and both the left end of the threaded rod 75 and the right side of the fixed rod 732 are magnetic with the same magnetic poles. The spring 74 is sleeved on the outside of the threaded rod 75.

[0049] Example 2:

[0050] When the material cutting speed is high, the motor 72 rotates rapidly in both clockwise and counterclockwise directions, which speeds up the tightening process and further prevents material breakage, providing a more stable transmission. At this time, the operator can rotate the threaded rod 75, causing it to move to the left while rotating. The magnetic repulsion at the left end of the threaded rod 75 pushes the fixed rod 732 to the left, causing the spring 74 to deform under tension. When the arc ball 611 and the extrusion ball 733 come into contact and compress each other, the fixed rod 732 is forced to the right, and the spring 74 deforms in the opposite direction, resulting in a smaller force on the arc ball 611. This reduces the buffer strength and prevents insufficient tension, thus preventing the material from detaching from the guide wheel 6. At the same time, the magnetic repulsion provides a certain buffer for the connecting shaft 61, ensuring the buffer effect and preventing the guide wheel 6 from moving to the right, which increases the instability of tension and affects the material transmission effect.

[0051] The motor 72 rotates clockwise N times and then counterclockwise N times.

[0052] The number of clockwise and counterclockwise rotations N of motor 72 includes five and ten. When the number of clockwise and counterclockwise rotations N of motor 72 is ten, the threaded rod 75 rotates slightly.

[0053] When the number of clockwise and counterclockwise rotations N of the motor 72 is five, the threaded rod 75 rotates extensively, and the initial position of the arc ball 611 is located in the middle of the six extruded balls 733.

[0054] Example 3:

[0055] By controlling the number of clockwise and counterclockwise rotations of motor 72, the amplitude of reciprocating movement of guide wheel 6 is controlled, thereby controlling the tension. When the winding speed is fast, the cutting material is less likely to detach from guide wheel 6. At this time, the number of clockwise and counterclockwise rotations of motor 72 is five. When the amplitude of reciprocating movement of guide wheel 6 is small, that is, the speed is faster, on the one hand, the tension can be guaranteed, and on the other hand, the reciprocating frequency of guide wheel 6 can be increased without increasing the energy consumption of motor 72, thereby ensuring the conveying quality of edge material.

[0056] At this point, the reciprocating movement of the guide wheel 6 needs to be buffered, as does the up-and-down movement of the guide wheel 6. By rotating the threaded rod 75, it is rotated so that the arc ball 611 is located in the middle of the six extrusion balls 733. In this way, the arc ball 611 can contact the extrusion balls 733 no matter whether it moves to the left or right, so that the guide wheel 6 can continuously jump and be buffered in both reciprocating movements. This effectively avoids the edge material from breaking or falling off and causing the conveying to be interrupted. When the guide wheel 6 moves back and forth at high speed, the edge material is kept in the limiting groove 8, providing efficient and stable transmission.

[0057] The overall device has a simple structure and low manufacturing cost.

[0058] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A preparation process for a TPEE three-layer co-extruded polyester light-shielding film, characterized in that: The preparation process includes the following steps: Step S1: The equipment is arranged in a straight line. The pre-made modified raw material of TPEE is circulated through the three-way dehumidification and vacuum drying unit, corresponding to three sets of extruders. The material is automatically sucked in and fed through the three-way dehumidification and vacuum drying unit. Then, it is continuously fed into the three hoppers A, B, and C in real time and quantitatively. Step S2: The material is fed into the screw and heated to the required processing temperature by the screw. Then it is extruded, and three layers are co-extruded corresponding to the screw. The middle and bottom layers are light-shielding layers, and the top layer is a coloring layer. Step S3: The chilled water unit introduces cooling water into the stripping roller, and the extruded material enters the mold and rubber roller step surface. The chilled water unit adopts a one-to-three configuration to introduce cooling water into the stripping roller section, and the patterned roller section and the rubber roller section are pressed against each other. Step S4: The material is introduced into the traction cutting roller section through the corona machine for the next section. At the same time, the edge is cut. The edge material is crushed by the edge crusher and then sent back to the B hopper through the air conveying system and the crushed material air duct. After being flattened by the constant tensioner and the flattening olive roller, it enters the winding and changing section for automatic meter counting and automatic film cutting. Step S5: Rolling, unwinding, packaging, placing on shelves, and warehousing; Step S6: After the co-extruded film is prepared, a TPEE hot melt adhesive cloth-plastic composite equipment is provided. At the same time, the pre-woven and dyed PET polyester fabric is placed on the constant tension fabric spreading frame. After applying adhesive through the adhesive mold, it is composited with the constant tension film, flattened and rolled up to form a multifunctional cloth-plastic composite fabric. This achieves the goal of 100% recyclability, crushing and granulation after use, which is energy-saving and environmentally friendly. The traction trimming roller section in step S4 includes two bases (1), roller one (2), roller two (3), roller three (4), cutter (5), two guide wheels (6), and tension chamber (7). The edge-receiving crusher is equipped with a take-up shaft, and the cut material enters the edge-receiving crusher through the right side of the front guide wheel (6) and the right side of the rear guide wheel (6) and the surface of the take-up shaft. Roller 1 (2), Roller 2 (3), and Roller 3 (4) are all axially connected between two bases (1). Roller 2 (3) and Roller 3 (4) are arranged vertically opposite each other and press against the light-shielding film. Roller 1 (2) is located to the left of Roller 3 (4), and the light-shielding film is located on the surface of Roller 1 (2). The cutter (5) is fixedly installed between the two bases (1) and is located above Roller 1 (2). The tension chamber (7) is fixedly installed above one of the bases (1) and is located to the right of Roller 3 (4). One of the guide wheels (6) is mounted on the upper part of the front base (1), and the other guide wheel (6) is mounted on the upper part of the front base (1). The bottom bearing is installed on the connecting shaft (61). The lower end of the connecting shaft (61) is fixed with a telescopic joint (62). The lower end of the telescopic joint (62) is fixedly connected to the connecting rod (63). The bottom end of the connecting rod (63) is fixed with a slider (64). The bottom of the inner wall of the tension chamber (7) is fixed with a slide rail (71) and a motor (72). The slider (64) is slidably connected to the inner wall of the slide rail (71). The output end of the motor (72) is fixedly connected with a gear (721). A toothed plate (631) is fixed on one side of the connecting rod (63), and the toothed plate (631) and the gear (721) mesh with each other. When the cut material is wound up, the motor (72) first rotates clockwise, driving the gear (721) to rotate clockwise. Through meshing with the toothed plate (631), the connecting rod (63) moves to the right. The connecting rod (63) moves to the right along the slide rail (71) via the slider (64), thereby driving the guide wheel (6) to move to the right through the telescopic joint (62) and the connecting shaft (61), pushing the cut material to move to the right, thereby stretching the cut material. After stretching the cut material, the motor (72) rotates counterclockwise, thereby releasing the cut material again, and the cut material is tightened and loosened repeatedly. The apparatus for preparing TPEE three-layer co-extruded polyester light-shielding film includes a production line, which is arranged in a straight line and includes a chilled water unit, a one-to-three dehumidification and vacuum drying unit, three hoppers (A, B, and C), three sets of screws, a distributor, a die, a rubber roller section, a patterned roller section, a peeling roller section, a base plate, a corona machine, a traction trimming roller section, an edge crushing machine, a flattening olive roller, a constant tensioner, and a winding and changing section. Raw materials with different properties from the three sets of screws are fed into a specially designed extrusion die through the distributor to produce film. The three-in-one dehumidification vacuum drying unit is connected to the pipes of the three hoppers A, B, and C. The chilled water unit is connected to the pipes of the rubber roller section, and there are two pipes, one for water inlet and the other for water outlet. The edge-receiving crusher is located on one side of the traction cutting roller section and is used for cutting and receiving edges and crushing edge materials. The edge-receiving crusher is connected to the B hopper by a crushing material air pipe.

2. The preparation process of a TPEE three-layer co-extruded polyester light-shielding film according to claim 1, characterized in that: A circular arc ball (611) is fixed on one side of the connecting shaft (61), a guide block (73) is fixed on the right side of the inner wall of the tension cavity (7), a guide rod (731) is slidably connected to the inner wall of the guide block (73), a fixing rod (732) is fixed on the left end of the guide rod (731), six extrusion balls (733) are evenly fixed on one side of the fixing rod (732), and a spring (74) is fixed between the right side of the fixing rod (732) and the right side of the inner wall of the tension cavity (7). After the connecting shaft (61) moves, the arc ball (611) and the extrusion ball (733) come into contact with each other.

3. The preparation process of a TPEE three-layer co-extruded polyester light-shielding film according to claim 2, characterized in that: The expansion joint (62) is elastic.

4. The preparation process of a TPEE three-layer co-extruded polyester light-shielding film according to claim 3, characterized in that: The tension chamber (7) has a threaded hole on the right side, and a threaded rod (75) is threadedly connected inside the threaded hole. In the initial state, there is a gap between the left end of the threaded rod (75) and the right side of the fixed rod (732), and both the left end of the threaded rod (75) and the right side of the fixed rod (732) are magnetic and have the same magnetic poles. The spring (74) is sleeved on the outside of the threaded rod (75).

5. The preparation process of a TPEE three-layer co-extruded polyester light-shielding film according to claim 4, characterized in that: The motor (72) rotates clockwise N times and then counterclockwise N times.

6. The preparation process of a TPEE three-layer co-extruded polyester light-shielding film according to claim 5, characterized in that: The number of clockwise and counterclockwise rotations N of the motor (72) includes five and ten. When the number of clockwise and counterclockwise rotations N of the motor (72) is ten, the threaded rod (75) rotates slightly. When the number of clockwise and counterclockwise rotations N of the motor (72) is five, the threaded rod (75) rotates extensively, and the initial position of the arc ball (611) is located in the middle of the six extrusion balls (733).

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