Preparation process of polypropylene coating material

Abstract

The invention relates to the technical field of polypropylene preparation, and particularly provides a preparation process of a polypropylene coating material. The preparation process of the polypropylene film coating material comprises the following steps: firstly, primarily mixing the polypropylene resin, 10-20% of diester phthalate, 0.1-2% of trioctyltin and 20-30% of magnesium silicate to form a prepared material, then pouring the prepared material into a high-speed mixer, adding xylene as a solvent, stirring at a high speed, and cooling to room temperature to obtain the polypropylene film coating material. The preparation method comprises the following steps: fully dissolving and mixing prepared materials to form a mixed material, introducing the mixed material into an extruder for melting and extruding to form a film-shaped material, finally introducing the film-shaped material into a heat-seal stretcher, and carrying out heat-seal stretching, cutting and coiling on the film-shaped material and a polyamide interlayer film by the heat-seal stretcher to obtain the polyamide interlayer film. And preparing the required polypropylene film coating material. The flexibility and ductility of the polypropylene film coating material are effectively improved, so that the output efficiency is improved, meanwhile, the polypropylene film coating material has better heat resistance and mechanical strength, and the service life of the polypropylene film coating material is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of polypropylene preparation, and in particular provides a process for preparing a polypropylene coating material. Background Art

[0002] Polypropylene is an environmentally friendly polymer material with excellent mechanical properties, electrical properties, and chemical resistance. It is widely used in the manufacture of automotive interior and exterior trims, daily necessities, decorative materials, packaging materials, electronic appliances, textiles, medical devices and other products. Due to its excellent performance, mature production technology and low cost, polypropylene has become one of the fastest growing and highest-yielding polymer materials.

[0003] In recent years, the application of polypropylene materials has gradually expanded to the field of coated products, such as surface coating of automotive interior parts, furniture, decorative materials, etc. However, the traditional preparation process has certain limitations in terms of flexibility, ductility, heat resistance and mechanical strength, which limits its poor plastic retention when coated on the surface of objects, resulting in deformation or even disappearance of surface textures or patterns. Summary of the invention

[0004] Based on this, it is necessary to provide a polypropylene coating material preparation process to solve at least one technical problem in the background technology.

[0005] A polypropylene coating material preparation process, the preparation process comprising the following steps:

[0006] Step S1: preparing polypropylene resin, 10%-20% of phthalic acid diester, 0.1%-2% of trioctyltin and 20%-30% of magnesium silicate and preliminarily mixing them to form a prepared material;

[0007] Step S2: pouring the prepared materials into a high-speed mixer, adding xylene as a solvent, and stirring at a high speed to fully dissolve and mix the prepared materials to form a mixed material;

[0008] Step S3: introducing the mixed material into an extruder for melting and extrusion to form a film-like material;

[0009] Step S4: introducing the film-like material into a heat-sealing stretching machine, and the heat-sealing stretching machine heat-seals, stretches, cuts, and rolls up the film-like material and the polyamide interlayer film to produce the desired polypropylene coating material;

[0010] The heat sealing stretching machine described in the above step S4 includes a heat sealing stretching frame, a material connection and cutting assembly, a feeding assembly, a sandwich assembly, a pressing assembly and a discharging assembly. The heat sealing stretching frame includes a cutting frame, a sandwich stretching frame, a heat sealing frame, a conveying seat and a feeding frame. The bottom of the cutting frame is fixedly installed on the side of the installation bottom surface adjacent to the extruder. The extruder is provided with a waste collection box at one end of the cutting frame away from the extruder. One end of the outer side wall of the sandwich stretching frame is fixedly installed on the inner side wall of the cutting frame away from the waste collection box. The outer side wall of the heat sealing frame is fixedly installed on the inner side wall of the sandwich stretching frame away from the waste collection box. The conveying seat is fixedly installed on the bottom of the cutting frame, the interlayer stretching frame and the heat sealing frame at one end away from the waste collection box, the feeding frame is fixedly installed on the interlayer stretching frame at one end away from the waste collection box, the material receiving and cutting assembly is slidably installed in the cutting frame, the feeding assembly is slidably installed in the feeding frame, the interlayer assembly is slidably installed on the outside of the interlayer stretching frame, the pressing assembly is slidably installed in the heat sealing frame and the conveying seat, the discharging assembly is installed on the inner side wall of the heat sealing frame adjacent to one end of the waste collection box, and the discharging assembly is used to transfer, discharge and store the manufactured polypropylene coating material.

[0011] As a further improvement of the present invention, a conveying frame is arranged in the middle of the cutting frame, and the conveying frame is arranged adjacent to the extruder for guiding and conveying the film-like material. The sandwich stretching frame comprises a sandwich frame and a stretching frame. The outer side wall of the sandwich frame is fixedly mounted on the inner side wall of the cutting frame away from one end of the waste collection box, the outer side wall of the stretching frame is fixedly mounted on the inner side wall of the sandwich frame adjacent to one end of the waste collection box, a driving plate is convexly provided on the top surface of the sandwich frame adjacent to one end of the waste collection box, the feeding frame comprises a feeding table and a sensor frame, and one side of the feeding table is located at the stretching frame away from the waste collection At the bottom of one end of the collection box, the bottom of the sensor frame is fixedly installed on the other side of the feeding platform, and one end of the sensor frame is fixedly connected to the end of the interlayer frame away from the waste collection box. A feeding sliding groove is recessed on the top surface of the feeding platform, and a feeding pushing plate is slidably arranged in the feeding sliding groove. A pushing cylinder is arranged on one side of the feeding platform, and the output shaft of the pushing cylinder is fixedly connected to the feeding pushing plate, and clamping claws are arranged on both sides of the feeding pushing plate. A discharge platform is arranged at both ends of the top surface of the feeding platform, and a plurality of workpieces to be rolled are arranged on the length direction of the discharge platform. The sensor frame is used to identify and draw lines on the workpieces to be rolled.

[0012] As a further improvement of the present invention, the material receiving and cutting assembly includes two cutting slide rails, a spur rack, a cutting mounting plate, a cutting cylinder, a material receiving cylinder, a cutting element and a material receiving element. The two cutting slide rails are fixedly mounted on both sides of the top of the cutting frame, the inner side wall of the spur rack is fixedly mounted on the inner side of the top of the cutting frame, the bottom of the cutting mounting plate is slidably mounted on one end of the top surface of the cutting frame, a cutting motor mounting groove is recessed through the middle of the inner side of the bottom surface of the cutting mounting plate, a cutting drive motor is arranged in the cutting motor mounting groove, a driving gear is arranged on the output shaft of the cutting drive motor, the driving gear is meshed and connected with the spur rack, and the bottom of the cutting mounting plate A cutting cylinder mounting groove is concavely provided through the middle part of the surface, and the bottom of the cutting cylinder is fixedly installed in the cutting cylinder mounting groove. First guide holes are concavely provided through the four corners in the middle part of the bottom surface of the cutting mounting plate, and first guide columns are slidably provided on the four first guide holes. Claw mounting plates are respectively protruded from both ends of the bottom surface of the cutting mounting plate, and electric-controlled clamping claws are protruded obliquely from the bottom of the outer side walls of the two clamping claw mounting plates. The material receiving cylinder is fixedly installed in the middle part of the outer side of the bottom surface of the cutting mounting plate, the top surface of the cutting element is fixedly installed on the output shaft of the cutting cylinder and is arranged in the cutting frame, and the top of the material receiving element is fixedly installed on the output shaft of the material receiving cylinder.

[0013] As a further improvement of the present invention, the cutting element includes a cutting plate, a cutting drive plate, a cutting motor and a hot cutting knife. The middle part of the top surface of the cutting plate is fixedly installed in the output shaft of the cutting cylinder, and the four corners of the top surface of the cutting plate are respectively fixedly connected to the bottom ends of the four first guide columns. A plurality of cutting mounting strips are convexly provided on the inner side of the bottom surface of the cutting plate along the length direction, and a positioning mounting strip is convexly provided at the bottom of the outer side wall of each cutting mounting strip. The bottom surface of the cutting driving plate is fixedly installed on the outer side walls of the plurality of positioning mounting strips, so that the length direction of the cutting driving plate is the same as the length direction of the cutting driving plate. Cutting mounting blocks are respectively convexly provided at both ends of the top surface of the cutting driving plate, and first rotating holes are respectively penetrated through the middle of the two cutting mounting blocks, and a first threaded rod is arranged between the two first rotating holes. The cutting motor is fixedly installed on the outer side wall of one of the cutting driving plates, and the output shaft of the cutting motor is fixedly connected to one end of the first threaded rod. Two cutting guide rods are also arranged between the inner side walls of the two cutting mounting blocks. The two ends of the bottom of the hot cutting knife are slidably installed on one end of the two cutting guide rods, and the bottom of the hot cutting knife is also penetrated through a concave threaded hole and is installed on one end of the first threaded rod through the threaded hole.

[0014] As a further improvement of the present invention, the material receiving element includes two material receiving guide columns, a material receiving hot pushing plate and a material receiving rotating rod. The top ends of the two material receiving guide columns are respectively fixedly installed on the two ends of the outer side of the bottom surface of the cutting mounting plate. The middle part of the material receiving hot pushing plate is fixedly connected to the output shaft of the material receiving cylinder, and the two ends of the material receiving hot pushing plate are slidably installed in the middle part of the two material receiving guide columns. The two ends of the bottom surface of the material receiving hot pushing plate are convexly provided with clamping columns, and the two ends of the material receiving rotating rod are fixedly installed on the bottom ends of the two clamping columns. A rotating sleeve is rotatably provided in the middle part of the outer wall of the material receiving rotating rod.

[0015] As a further improvement of the present invention, the feeding assembly includes a feeding plate, a feeding cylinder, a feeding mounting plate and a plurality of feeding claws. The bottom surface of the feeding plate is slidably mounted on the top surface of the stretching frame, and a feeding drive motor is arranged inside the feeding plate. A feeding cylinder mounting groove is recessed through the middle part of the feeding plate, the middle part of the feeding cylinder is fixedly mounted in the feeding cylinder mounting groove, the middle part of the top surface of the feeding mounting plate is fixedly mounted in the output shaft of the feeding cylinder, and a plurality of feeding claws are installed on the bottom of the feeding mounting plate along the length direction for grabbing and transporting the workpiece to be rolled.

[0016] As a further improvement of the present invention, the sandwich assembly includes a sandwich mounting plate, a longitudinal drive cylinder, a transverse drive cylinder, a sandwich drive plate and a clamping element. The bottom surface of the sandwich mounting plate is slidably mounted on the top surface of the sandwich frame. A longitudinal cylinder mounting groove is recessed on the inner side of the top surface of the sandwich mounting plate. The middle part of the longitudinal drive cylinder is fixedly mounted in the longitudinal cylinder mounting groove. Concave sandwich sliding holes are respectively penetrated at the four corners of the middle of the top surface of the sandwich mounting plate. A sandwich guide rod is slidably arranged on each sandwich sliding hole. The transverse drive cylinder is fixedly mounted on one end of the top surface of the sandwich mounting plate, and the output shaft of the transverse drive cylinder is fixedly connected to the end wall of the drive plate. The top surface of the sandwich driving plate is fixedly connected to the output shaft of the longitudinal driving cylinder, and the four corners of the top surface of the sandwich driving plate are respectively fixedly connected to the bottom ends of the four sandwich guide rods, and a sandwich mounting platform is respectively provided at the end and the middle of the top surface of the sandwich driving plate away from the waste collection box, a sandwich rotating shaft is rotatably arranged between the tops of the two sandwich mounting platforms, a rotating motor is arranged at one end of the sandwich rotating shaft, a polyamide sandwich film is rolled up on the sandwich rotating shaft, a clamping cylinder mounting groove is recessed through the end of the inner side of the sandwich driving plate away from the sandwich mounting platform, a clamping cylinder is arranged in the clamping cylinder mounting groove, and a clamping element is fixedly mounted on the output shaft of the clamping cylinder.

[0017] As a further improvement of the present invention, the clamping element includes a clamping plate, a micro-controlled cylinder, a roller mounting platform, a clamping mounting platform, a guide cylinder, a guide mounting plate and a plurality of guide wheels. One end of the bottom surface of the clamping plate is fixedly mounted on the output shaft of the clamping cylinder, and micro-controlled slide rails are protruding from both ends of the outer side of the clamping plate. One end of the bottom of the roller mounting platform is fixedly mounted on the middle part of the clamping plate away from the interlayer mounting platform. A roller cylinder is protruding from the top of the roller mounting platform. A roller is provided on the output shaft of the roller cylinder. The micro-controlled cylinder is fixedly mounted on the clamping plate. On the inner side, the two ends of the bottom surface of the clamping mounting platform are slidably mounted on two micro-control slide rails, and the output shaft of the micro-control cylinder is fixedly connected to the clamping mounting platform, a guide sliding hole is recessed through one end of the clamping mounting platform, the guide cylinder is fixedly mounted on one end of the clamping mounting platform adjacent to the interlayer mounting platform, and the guide cylinder output is fixedly connected to the guide mounting plate through the guide sliding hole, a guide wheel mounting plate is provided at the bottom of one end of the guide mounting plate adjacent to the interlayer mounting platform, and a plurality of guide wheels are rotatably mounted on the top surface of the guide wheel mounting plate along the length direction.

[0018] As a further improvement of the present invention, the pressing assembly includes a stretching mounting plate, a stretching cylinder, a pressing and stretching frame, a pressing mounting plate, a pressing positioning motor, a driven wheel, a pressing plate, a hot pressing block and a transfer cooling element. The end wall of the stretching mounting plate is fixedly mounted on the inner side of the feeding table adjacent to one end of the waste collection box, and stretching slide rails are respectively arranged on both sides of the top surface of the stretching mounting plate. The stretching cylinder is fixedly mounted on the top surface of the feeding table adjacent to one end of the waste collection box, and the two sides of the bottom of the pressing and stretching frame are respectively slidably mounted in the two stretching slide rails, and the output shaft of the stretching cylinder is fixedly connected to the pressing and stretching frame. The top and bottom of the stretching frame are rotatably provided with driving wheels respectively, and the driving wheel at the bottom is also provided with a micro motor. The bottom surface of the pressing mounting plate is slidably provided on the top surface of the conveying seat, the pressing positioning motor is fixedly installed on the inner side of the top surface of the conveying seat, the driven wheel is rotatably installed on the outer side of the top surface of the conveying seat, and a conveyor belt is sleeved between the driven wheel and the output shaft of the pressing positioning motor. A positioning block is convexly provided on the top surface of the pressing mounting plate, and the positioning block is fixedly connected to one end of the conveyor belt. A pressing driving cylinder is provided in the middle of the top surface of the pressing mounting plate, and pressing guide rods are convexly provided at the four corners of the top surface of the pressing mounting plate. The middle part is fixedly mounted on the output shaft of the pressing driving cylinder, and the four corners of the pressing plate are slidably mounted on the top of the four pressing guide rods respectively. The two ends of the top surface of the pressing plate are convexly provided with a placing table, and the top surface of the placing table is concavely provided with a placing groove, which is used to place the workpiece to be rolled. A plurality of pressing cylinders are convexly provided on the top surface of the pressing plate along the length direction. The bottom of the hot pressing block is fixedly mounted on the output shafts of the plurality of pressing cylinders. The transfer cooling element is slidably mounted on the heat sealing frame; the transfer cooling element includes a transfer mounting plate, a transfer cylinder, a transfer plate, two transfer mounting tables and two transfer buckle blocks, and the transfer mounting plate The bottom surface is slidably installed on one end of the top surface of the heat sealing frame, a transfer motor is arranged inside the transfer mounting plate, a transfer cylinder mounting groove is recessed through the middle part of the transfer mounting plate, the middle part of the transfer cylinder is fixedly installed in the transfer cylinder mounting groove, the middle part of the top surface of the transfer plate is fixedly installed on the output shaft of the transfer cylinder, preset sliding grooves are respectively recessed at both ends of the top surface of the transfer plate, two transfer mounting platforms are slidably installed on the two preset sliding grooves, and a transfer clamping cylinder is also arranged between the inner ends of the two transfer mounting platforms and the two ends of the transfer mounting plates, and two transfer buckle blocks are fixedly installed on the bottom of the inner ends of the two transfer mounting platforms.

[0019] As a further improvement of the present invention, the above step S4 includes the following steps:

[0020] Step S41: Start the push cylinder to make the feeding push plate slide inward along the feeding sliding groove, move the workpiece to be rolled to the bottom of the feeding mounting plate, then start the feeding cylinder and clamp the workpiece to be rolled using a plurality of feeding clamps;

[0021] Step S42: Start the feeding drive motor, move the feeding plate to the bottom of the pressing plate, and place it between the two placement tables, then start the pressing positioning motor so that the positioning block and the pressing stretching frame are arranged opposite to each other;

[0022] Step S43: Start the pressing driving cylinder to move the workpiece to be rolled on the pressing plate to a position between the two driving wheels, and then start the stretching cylinder so that the workpiece to be rolled is clamped between the two driving wheels of the pressing and stretching frame, completing the preparation work;

[0023] Step S44: the film material extruded by the extruder is sequentially passed through the rotating sleeve, the conveying frame and the interlayer assembly and rolled onto the workpieces to be rolled on the two placement tables, and then the micro motor is started to rotate the workpieces to be rolled and perform heat sealing and stretching operations;

[0024] Step S45: Start the micro-control cylinder and the guide cylinder, so that the multiple guide wheels on the guide wheel mounting plate move synchronously, and the polyamide interlayer film is rolled up together with the film-like material on the outer wall of the workpiece to be rolled together with the rotating roller;

[0025] Step S46: multiple pressing cylinders are started synchronously to perform thermal pressing and stretching winding on the polyamide interlayer film and the film-like material on the workpiece to be wound;

[0026] Step S47: When the winding length is reached, the cutting motor will start, so that the hot cutter will move along the cutting guide rod toward one end of the waste collection box, and the hot cutter will cut the film material to complete the automatic cutting of the polypropylene coated material.

[0027] The beneficial effects of the present invention are as follows:

[0028] 1. The polypropylene coating material produced by this process is added with polypropylene resin, 10%-20% of phthalic acid diester, 0.1%-2% of trioctyltin and 20%-30% of magnesium silicate, and the polyamide interlayer film is applied as an interlayer in the polypropylene coating material by thermal method, which effectively improves the flexibility and ductility of the polypropylene coating material, thereby improving the output efficiency. At the same time, it has good heat resistance and mechanical strength, prolongs its service life, helps to reduce the replacement frequency of the polypropylene coating material, and reduces resource consumption and environmental impact.

[0029] 2. The present invention can automatically and efficiently complete the heat-sealing stretching, cutting and winding work. By starting multiple cylinders such as the push cylinder, the feeding cylinder, the pressing drive cylinder, the stretching cylinder and multiple drive motors such as the cutting drive motor and the feeding drive motor, the entire work process is automated, reducing the need for manual operation and improving production efficiency. By starting the pressing positioning motor and the transfer cylinder, the workpiece to be rolled and the transfer plate and other components are accurately positioned, ensuring the precise position of the workpiece at different working stages, ensuring the accuracy and consistency of the work. The clamping jaws, guide wheels and rollers are used to control the workpiece. The coordinated effect of other components realizes the clamping and guiding of the workpiece and film-like materials to be rolled, ensures the stability and correctness of the workpiece during movement, and avoids material deviation and dislocation. At the same time, through the heating and extension of the hot pressing block and the pressing cylinder, the thermal pressing and stretching winding of the polyamide interlayer film and film-like materials are realized, ensuring the quality and reliability of the product. Finally, through the start-up of the cutting motor and the transfer cylinder, the cutting and transfer of the film-like material are realized. At the same time, the transfer plate and the discharging assembly are used to cool the manufactured polypropylene coated material, ensuring the integrity and cooling effect of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a three-dimensional schematic diagram of an embodiment of the present invention.

[0031] Figure 2 It is a three-dimensional schematic diagram of another embodiment of the present invention.

[0032] Figure 3 It is a three-dimensional schematic diagram of yet another embodiment of the present invention.

[0033] Figure 4 It is a three-dimensional schematic diagram of a material splicing and cutting assembly in one embodiment of the present invention.

[0034] Figure 5 It is a three-dimensional schematic diagram of a material splicing and cutting assembly in another embodiment of the present invention.

[0035] Figure 6 It is a three-dimensional schematic diagram of a sandwich assembly in one embodiment of the present invention.

[0036] Figure 7 It is a three-dimensional schematic diagram of a sandwich assembly in another embodiment of the present invention.

[0037] In the figure:

[0038] 10. Heat-sealing stretching machine; 11. Extruder; 20. Heat-sealing stretching frame; 21. Cutting frame; 211. Waste collection box; 212. Conveying frame; 22. Sandwich stretching frame; 221. Sandwich frame; 222. Stretching frame; 223. Driving plate; 23. Heat-sealing frame; 24. Conveying seat; 25. Feeding frame; 251. Feeding table; 252. Sensing frame; 253. Feeding slide groove; 254. Feeding push plate; 255. Pushing cylinder; 256. Clamping claw; 257. Unwinding table; 258. Workpiece to be rolled; 30. Material receiving and cutting assembly; 31. Cutting slide rail; 32. Straight rack; 33. Cutting mounting plate; 331. Cutting motor mounting groove; 332. Cutting drive motor; 333. Cutting cylinder mounting groove; 334, first guide hole; 335, first guide column; 336, clamping jaw mounting plate; 337, electric control clamping jaw; 34, cutting cylinder; 35, receiving cylinder; 36, cutting element; 361, cutting plate; 362, cutting drive plate; 363, cutting motor; 364, hot cutting knife; 365, cutting mounting strip; 366, positioning mounting strip; 367, cutting mounting block; 368, first rotating hole; 369, first threaded rod; 360, cutting guide rod; 37, receiving element; 371, receiving guide column; 372, receiving hot push plate; 373, receiving rotating rod; 374, clamping column; 375, rotating sleeve; 40, feeding assembly; 41, feeding plate; 42, feeding cylinder; 43, feeding mounting plate; 44 , feeding clamp; 45, feeding cylinder mounting groove; 50, sandwich assembly; 51, sandwich mounting plate; 511, longitudinal cylinder mounting groove; 512, sandwich slide hole; 513, sandwich guide rod; 52, longitudinal drive cylinder; 53, transverse drive cylinder; 54, sandwich drive plate; 541, sandwich mounting platform; 542, sandwich shaft; 543, clamping cylinder mounting groove; 544, clamping cylinder; 55, clamping element; 551, clamping plate; 552, micro-control cylinder; 553, clamping mounting platform; 554, roller mounting platform; 555, guide cylinder; 556, guide mounting plate; 557, guide wheel; 558, micro-control slide rail; 550, roller cylinder; 561, roller; 562, guide wheel mounting plate; 60, pressure 61. Stretching mounting plate; 611. Stretching slide rail; 62. Stretching cylinder; 63. Pressing stretching frame; 631. Driving wheel; 632. Micro motor; 64. Pressing mounting plate; 641. Positioning block; 642. Pressing driving cylinder; 643. Pressing guide rod; 65. Pressing positioning motor; 651. Driven wheel; 652. Conveyor belt; 66. Pressing plate; 661. Placement table; 662. Placement groove; 68. Hot pressing block; 67. Transfer cooling element; 671. Transfer mounting plate; 672. Transfer plate; 673. Transfer cylinder; 674. Transfer mounting table; 675. Transfer buckle block; 676. Transfer cylinder mounting groove; 677. Preset slide groove; 678. Transfer clamping cylinder; 70. Discharging assembly. DETAILED DESCRIPTION

[0039] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0040] In the description of the present invention, it should be noted that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0042] See also Figures 1 to 7 , a polypropylene coating material preparation process, including the preparation process comprising the following steps:

[0043] Step S1: preparing polypropylene resin, 10%-20% of phthalic acid diester, 0.1%-2% of trioctyltin and 20%-30% of magnesium silicate and preliminarily mixing them to form a prepared material;

[0044] Step S2: pouring the prepared materials into a high-speed mixer, adding xylene as a solvent, and stirring at a high speed to fully dissolve and mix the prepared materials to form a mixed material;

[0045] Step S3: introducing the mixed material into the extruder 11 for melting and extrusion to form a film-like material;

[0046] Step S4: introducing the film-like material into the heat-sealing stretching machine 10, and the heat-sealing stretching machine 10 heat-seals, stretches, cuts, and rolls up the film-like material and the polyamide interlayer film to produce the desired polypropylene coating material;

[0047] The heat sealing stretching machine 10 described in the above step S4 includes a heat sealing stretching frame 20, a material receiving and cutting assembly 30, a feeding assembly 40, a sandwich assembly 50, a pressing assembly 60 and a discharging assembly 70. The heat sealing stretching frame 20 includes a cutting frame 21, a sandwich stretching frame 22, a heat sealing frame 23, a conveying seat 24 and a feeding frame 25. The bottom of the cutting frame 21 is fixedly installed on the side of the installation bottom surface adjacent to the extruder 11. The extruder 11 is provided with a waste collection box 211 at one end of the cutting frame 21 away from the extruder 11. One end of the outer side wall of the sandwich stretching frame 22 is fixedly installed on the inner side wall of the cutting frame 21 away from the waste collection box 211. The outer side wall of the heat sealing frame 23 is fixedly installed on the inner side wall of the sandwich stretching frame 22 away from the waste collection box 211. Adjacent to one end of the waste collection box 211, the conveying seat 24 is fixedly installed on the bottom of the cutting frame 21, the interlayer stretching frame 22 and the heat sealing frame 23 away from the end of the waste collection box 211, the feeding frame 25 is fixedly installed on the end of the interlayer stretching frame 22 away from the waste collection box 211, the material receiving and cutting assembly 30 is slidably installed in the cutting frame 21, the feeding assembly 40 is slidably installed in the feeding rack 25, the interlayer assembly 50 is slidably installed on the outside of the interlayer stretching frame 22, the pressing assembly 60 is slidably installed in the heat sealing frame 23 and the conveying seat 24, and the discharging assembly 70 is installed on the inner side wall of the heat sealing frame 23 adjacent to the end of the waste collection box 211, and the discharging assembly 70 is used to transfer, discharge and store the manufactured polypropylene coating material.

[0048] A conveying frame 212 is arranged in the middle of the cutting frame 21. The conveying frame 212 is arranged adjacent to the extruder 11 and is used to guide and convey the film-like material. The sandwich stretching frame 22 includes a sandwich frame 221 and a stretching frame 222. The outer side wall of the sandwich frame 221 is fixedly installed on the inner side wall of the cutting frame 21 away from the end of the waste collection box 211. The outer side wall of the stretching frame 222 is fixedly installed on the inner side wall of the sandwich frame 221 adjacent to the end of the waste collection box 211. A driving plate 223 is convexly provided on the top surface of the sandwich frame 221 adjacent to the end of the waste collection box 211. The feeding frame 25 includes a feeding table 251 and a sensor frame 252. One side of the feeding table 251 is located at the bottom of the end of the stretching frame 222 away from the waste collection box 211. The bottom of the sensor frame 252 is fixedly installed on the other side of the feeding table 251, and one end of the sensor frame 252 is fixedly connected to the end of the interlayer frame 221 away from the waste collection box 211. The top surface of the feeding table 251 is recessed with a feeding sliding groove 253, and a feeding pushing plate 254 is slidably arranged in the feeding sliding groove 253. A pushing cylinder 255 is arranged on one side of the feeding table 251, and the output shaft of the pushing cylinder 255 is fixedly connected to the feeding pushing plate 254. Clamping claws 256 are arranged on both sides of the feeding pushing plate 254. A discharge table 257 is arranged at both ends of the top surface of the feeding table 251, and a plurality of workpieces 258 to be rolled are arranged on the discharge table 257 along the length direction. The sensor frame 252 is used to identify and draw lines on the workpieces 258 to be rolled.

[0049] The material receiving and cutting assembly 30 includes two cutting slide rails 31, a spur rack 32, a cutting mounting plate 33, a cutting cylinder 34, a material receiving cylinder 35, a cutting element 36 and a material receiving element 37. The two cutting slide rails 31 are fixedly mounted on both sides of the top of the cutting frame 21. The inner side wall of the spur rack 32 is fixedly mounted on the inner side of the top of the cutting frame 21. The bottom of the cutting mounting plate 33 is slidably mounted on one end of the top surface of the cutting frame 21. A cutting motor mounting groove 331 is recessed in the middle of the inner side of the bottom surface of the cutting mounting plate 33. A cutting drive motor 332 is disposed in the cutting motor mounting groove 331. A driving gear is disposed on the output shaft of the cutting drive motor 332. The driving gear is meshed and connected with the spur rack 32. The middle of the bottom surface of the cutting mounting plate 33 is recessed. A cutting cylinder mounting groove 333 is recessed, and the bottom of the cutting cylinder 34 is fixedly mounted in the cutting cylinder mounting groove 333. First guide holes 334 are respectively recessed through the four corners in the middle of the bottom surface of the cutting mounting plate 33. First guide columns 335 are slidably arranged on the four first guide holes 334. Claw mounting plates 336 are respectively protruded from both ends of the bottom surface of the cutting mounting plate 33. Electric-controlled claws 337 are obliquely protruded from the bottom of the outer side walls of the two claw mounting plates 336. The material receiving cylinder 35 is fixedly mounted in the middle of the outer side of the bottom surface of the cutting mounting plate 33. The top surface of the cutting element 36 is fixedly mounted on the output shaft of the cutting cylinder 34 and is arranged in the cutting frame 21. The top of the material receiving element 37 is fixedly mounted on the output shaft of the material receiving cylinder 35.

[0050] The cutting element 36 includes a cutting plate 361, a cutting drive plate 362, a cutting motor 363 and a hot cutting knife 364. The middle of the top surface of the cutting plate 361 is fixedly installed in the output shaft of the cutting cylinder 34, and the four corners of the top surface of the cutting plate 361 are respectively fixedly connected to the bottom ends of the four first guide columns 335. A plurality of cutting installation strips 365 are protruded along the length direction on the inner side of the bottom surface of the cutting plate 361. A positioning installation strip 366 is obliquely protruded at the bottom of the outer side wall of each cutting installation strip 365. The bottom surface of the cutting drive plate 362 is fixedly installed on the outer side walls of the plurality of positioning installation strips 366, so that the length direction of the cutting drive plate 362 is the same as the length direction of the cutting drive plate 362. Cutting mounting blocks 367 are respectively provided at both ends of the top surface of 362, and first rotating holes 368 are respectively penetrated through the middle of the two cutting mounting blocks 367, and a first threaded rod 369 is arranged between the two first rotating holes 368. The cutting motor 363 is fixedly installed on the outer side wall of one of the cutting drive plates 362, and the output shaft of the cutting motor 363 is fixedly connected to one end of the first threaded rod 369. Two cutting guide rods 360 are also arranged between the inner side walls of the two cutting mounting blocks 367. The two ends of the bottom of the hot cutting knife 364 are slidably installed on one end of the two cutting guide rods 360. The bottom of the hot cutting knife 364 is also penetrated by a threaded hole and is installed on one end of the first threaded rod 369 through the threaded hole.

[0051] The material receiving element 37 includes two material receiving guide columns 371, a material receiving hot pushing plate 372 and a material receiving rotating rod 373. The top ends of the two material receiving guide columns 371 are respectively fixedly installed on the two ends of the outer side of the bottom surface of the cutting mounting plate 33. The middle part of the material receiving hot pushing plate 372 is fixedly connected to the output shaft of the material receiving cylinder 35, and the two ends of the material receiving hot pushing plate 372 are slidably installed in the middle part of the two material receiving guide columns 371. The two ends of the bottom surface of the material receiving hot pushing plate 372 are convexly provided with clamping columns 374. The two ends of the material receiving rotating rod 373 are fixedly installed on the bottom ends of the two clamping columns 374. A rotating sleeve 375 is rotatably provided in the middle part of the outer wall of the material receiving rotating rod 373.

[0052] The feeding assembly 40 includes a feeding plate 41, a feeding cylinder 42, a feeding mounting plate 43 and a plurality of feeding claws 44. The bottom surface of the feeding plate 41 is slidably mounted on the top surface of the stretching frame 222, and a feeding drive motor is arranged inside the feeding plate 41. A feeding cylinder mounting groove 45 is recessed through the middle part of the feeding plate 41. The middle part of the feeding cylinder 42 is fixedly mounted in the feeding cylinder mounting groove 45. The middle part of the top surface of the feeding mounting plate 43 is fixedly mounted in the output shaft of the feeding cylinder 42. A plurality of feeding claws 44 are installed at the bottom of the feeding mounting plate 43 along the length direction for grabbing and transporting the workpiece 258 to be rolled.

[0053] The sandwich assembly 50 includes a sandwich mounting plate 51, a longitudinal driving cylinder 52, a transverse driving cylinder 53, a sandwich driving plate 54 and a clamping element 55. The bottom surface of the sandwich mounting plate 51 is slidably mounted on the top surface of the sandwich frame 221. The inner side of the top surface of the sandwich mounting plate 51 is concavely provided with a longitudinal cylinder mounting groove 511. The middle part of the longitudinal driving cylinder 52 is fixedly mounted in the longitudinal cylinder mounting groove 511. The four corners of the middle part of the top surface of the sandwich mounting plate 51 are respectively penetrated with sandwich sliding holes 512. A sandwich guide rod 513 is slidably arranged on each sandwich sliding hole 512. The transverse driving cylinder 53 is fixedly mounted on one end of the top surface of the sandwich mounting plate 51, and the output shaft of the transverse driving cylinder 53 is fixedly connected to the end wall of the driving plate 223. The sandwich driving plate 54 The top surface is fixedly connected to the output shaft of the longitudinal driving cylinder 52, and the four corners of the top surface of the interlayer driving plate 54 are respectively fixedly connected to the bottom ends of the four interlayer guide rods 513, and the top surface of the interlayer driving plate 54 is respectively provided with interlayer mounting platforms 541 at one end away from the waste collection box 211 and the middle part, and an interlayer rotating shaft 542 is rotatably arranged between the tops of the two interlayer mounting platforms 541, a rotating motor is arranged at one end of the interlayer rotating shaft 542, and a polyamide interlayer film is rolled up on the interlayer rotating shaft 542, and a clamping cylinder mounting groove 543 is recessed through the inner side of the interlayer driving plate 54 away from the interlayer mounting platform 541, a clamping cylinder 544 is arranged in the clamping cylinder mounting groove 543, and a clamping element 55 is fixedly mounted on the output shaft of the clamping cylinder 544.

[0054] The clamping element 55 includes a clamping plate 551, a micro-control cylinder 552, a roller mounting platform 554, a clamping mounting platform 553, a guide cylinder 555, a guide mounting plate 556 and a plurality of guide wheels 557. One end of the bottom surface of the clamping plate 551 is fixedly mounted on the output shaft of the clamping cylinder 544. Micro-control slide rails 558 are respectively provided at both ends of the outer side of the clamping plate 551. One end of the bottom of the roller mounting platform 554 is fixedly mounted on the middle part of one end of the clamping plate 551 away from the sandwich mounting platform 541. A roller cylinder 550 is provided on the top of the roller mounting platform 554. A roller 561 is provided on the output shaft of the roller cylinder 550. The micro-control cylinder 552 is fixedly mounted on the clamping plate 5 On the inner side of 51, both ends of the bottom surface of the clamping mounting platform 553 are slidably mounted on two micro-control slide rails 558, and the output shaft of the micro-control cylinder 552 is fixedly connected to the clamping mounting platform 553, and a guide sliding hole is recessed through one end of the clamping mounting platform 553, and the guide cylinder 555 is fixedly mounted on one end of the clamping mounting platform 553 adjacent to the interlayer mounting platform 541, and the output of the guide cylinder 555 is fixedly connected to the guide mounting plate 556 through the guide sliding hole, and a guide wheel mounting plate 562 is provided at the bottom of one end of the guide mounting plate 556 adjacent to the interlayer mounting platform 541, and a plurality of guide wheels 557 are rotatably mounted on the top surface of the guide wheel mounting plate 562 along the length direction.

[0055] The pressing assembly 60 includes a stretching mounting plate 61, a stretching cylinder 62, a pressing stretching frame 63, a pressing mounting plate 64, a pressing positioning motor 65, a driven wheel 651, a pressing plate 66, a hot pressing block 68 and a transfer cooling element 67. The end wall of the stretching mounting plate 61 is fixedly mounted on the inner side of the feeding table 251 adjacent to one end of the waste collection box 211. The top surface of the stretching mounting plate 61 is respectively provided with stretching slide rails 611. The stretching cylinder 62 is fixedly mounted on the top surface of the feeding table 251 adjacent to the waste collection box 211. At one end of the collecting box 211, the two sides of the bottom of the pressing and stretching frame 63 are slidably installed in the two stretching slide rails 611, and the output shaft of the stretching cylinder 62 is fixedly connected to the pressing and stretching frame 63. The top and bottom of the pressing and stretching frame 63 are rotatably provided with driving wheels 631, and the driving wheel 631 at the bottom is also provided with a micro motor 632. The bottom surface of the pressing mounting plate 64 is slidably arranged on the top surface of the conveying seat 24, and the pressing positioning motor 65 is fixedly installed on the inner side of the top surface of the conveying seat 24. The wheel 651 is rotatably mounted on the outer side of the top surface of the conveying seat 24, a conveyor belt 652 is sleeved between the driven wheel 651 and the output shaft of the pressing positioning motor 65, a positioning block 641 is convexly provided on the top surface of the pressing mounting plate 64, and the positioning block 641 is fixedly connected to one end of the conveyor belt 652, a pressing driving cylinder 642 is arranged in the middle of the top surface of the pressing mounting plate 64, and pressing guide rods 643 are convexly provided at the four corners of the top surface of the pressing mounting plate 64, and the pressing driving cylinder 66 is fixedly installed in the middle of the pressing plate 66. 642 output shaft, and the four corners of the pressing plate 66 are slidably mounted on the top of the four pressing guide rods 643 respectively, and a placing platform 661 is convexly provided at both ends of the top surface of the pressing plate 66, and a placing groove 662 is concavely provided on the top surface of the placing platform 661, and the placing groove 662 is used to place the workpiece 258 to be rolled, and a plurality of pressing springs are convexly provided on the top surface of the pressing plate 66 along the length direction, and the bottom of the hot pressing block 68 is fixedly mounted on the top of the plurality of pressing springs, and the transfer cooling element 67 is slidably mounted on the heat sealing frame 23.

[0056] The transfer cooling element 67 includes a transfer mounting plate 671, a transfer cylinder 673, a transfer plate 672, two transfer mounting platforms 674 and two transfer buckle blocks 675. The bottom surface of the transfer mounting plate 671 is slidably mounted on one end of the top surface of the heat sealing frame 23. A transfer motor is arranged inside the transfer mounting plate 671. A transfer cylinder mounting groove 676 is recessed through the middle part of the transfer mounting plate 671. The middle part of the transfer cylinder 673 is fixedly mounted in the transfer cylinder mounting groove 676. The middle part of the top surface of the transfer plate 672 is fixedly mounted on the output shaft of the transfer cylinder 673. Pre-set slide grooves 677 are respectively recessed at both ends of the top surface of the transfer plate 672. The two transfer mounting platforms 674 are slidably mounted on the two preset slide grooves 677. A transfer clamping cylinder 678 is also arranged between the inner ends of the two transfer mounting platforms 674 and the two ends of the transfer mounting plate 671. The two transfer buckle blocks 675 are fixedly mounted on the bottom of the inner ends of the two transfer mounting platforms 674.

[0057] The above step S4 comprises the following steps:

[0058] Step S41: Start the push cylinder 255, so that the feeding push plate 254 slides inward along the feeding sliding groove 253, and moves the workpiece 258 to be rolled to the bottom of the feeding mounting plate 43, and then start the feeding cylinder 42, and use a plurality of feeding clamps 44 to clamp the workpiece 258 to be rolled;

[0059] Step S42: Start the feeding drive motor, move the feeding plate 41 to the bottom of the pressing plate 66, and place it between the two placement tables 661, then start the pressing positioning motor 65, so that the positioning block 641 is arranged opposite to the pressing stretching frame 63;

[0060] Step S43: Start the pressing driving cylinder 642 to move the workpiece 258 to be rolled on the pressing plate 66 to a position between the two driving wheels 631, and then start the stretching cylinder 62 to clamp the workpiece 258 between the two driving wheels 631 of the pressing and stretching frame 63, thus completing the preparation work;

[0061] Step S44: The film material extruded by the extruder 11 is sequentially passed through the rotating sleeve 375, the conveying frame 212 and the interlayer assembly 50 and rolled onto the workpiece 258 to be rolled on the two placement tables 661, and then the micro motor 632 is started to rotate the workpiece 258 to perform heat sealing and stretching operations;

[0062] Step S45: Start the micro-control cylinder 552 and the guide cylinder 555, so that the multiple guide wheels 557 on the guide wheel mounting plate 562 move synchronously, and the combined roller 5610 guides the polyamide sandwich film, so that the polyamide sandwich film is smoothly sent to the film-like material and adhered to the film-like material. As the workpiece 258 to be rolled rotates, the polyamide sandwich film will be rolled together with the film-like material on the outer wall of the workpiece 258 to be rolled;

[0063] Step S46: multiple pressing cylinders are started synchronously to perform thermal pressing and stretching winding on the polyamide interlayer film and the film-like material of the workpiece 258;

[0064] Step S47: When the winding length is reached, the cutting motor 363 will start, so that the hot cutter 364 will move along the cutting guide rod 360 toward one end of the waste collection box 211, and the hot cutter 364 will cut the film material to complete the automatic cutting of the polypropylene coating material.

[0065] For example, in one embodiment, before heat-sealing, stretching, cutting and winding, the push cylinder 255 needs to be started first, so that the output shaft of the push cylinder 255 is extended, so that the feeding push plate 254 slides inward along the feeding sliding groove 253, and then the clamping claw 256 on the feeding push plate 254 is used to clamp the workpiece 258 to be wound on the unloading table 257 and move it inward until the workpiece 258 to be wound moves to the right below the feeding mounting plate 43, and then the feeding cylinder 42 is started so that the feeding cylinder 42 is pressed. The output shaft of the cylinder 42 extends, pushing the feeding mounting plate 43 downward, so that the multiple feeding claws 44 will clamp the workpiece 258 to be rolled, and then the feeding drive motor will be started, so that the feeding plate 41 moves along the stretching frame 222 to the bottom of the pressing plate 66 and is placed between the two placement tables 661, and then the pressing positioning motor 65 will be started to make the conveyor belt 652 rotate and drive. Since the positioning block 641 is fixedly connected to one end of the conveyor belt 652, the pressing mounting plate 64 will follow along the conveyor belt 652. The top surface of the seat 24 moves until the positioning block 641 is arranged opposite to the pressing and stretching frame 63, and then the pressing driving cylinder 642 is started to extend the output shaft of the pressing driving cylinder 642, so that the pressing plate 66 will move up along the four pressing guide rods 643 until the workpiece 258 to be rolled on the pressing plate 66 moves to the position between the two driving wheels 631, and then the stretching cylinder 62 is started to extend the output shaft of the stretching cylinder 62, pushing the pressing and stretching frame 63 to rotate along the stretching slide rail 611. The cooling element 67 is moved until the workpiece 258 to be rolled is clamped between the two driving wheels 631 of the pressing and stretching frame 63, and the preparation work is completed. Then, the film material extruded by the extruder 11 is passed through the rotating sleeve 375, the conveying frame 212 and the interlayer assembly 50 in sequence and rolled onto the workpiece 258 to be rolled on the two placement tables 661. Then, the micro motor 632 is started, so that the micro motor 632 drives the driving wheel 631 to rotate, and then the workpiece 258 to be rolled is rotated to perform the heat sealing and stretching operation.

[0066] When the micro motor 632 is started, the rotary motor will start, causing the sandwich shaft 542 to rotate, so that the polyamide sandwich film rolled on the sandwich shaft 542 will be led out, and at the same time, the micro-control cylinder 552 will start, so that the output shaft of the micro-control cylinder 552 will extend to push the clamping mounting table 553 to move along the micro-control slide rail 558, and at the same time, the guide cylinder 555 will start to retract, so that the guide mounting plate 556 approaches one end of the clamping mounting table 553, so that the guide wheel mounting plate 562 moves synchronously, so that the multiple guide wheels 557 on the guide wheel mounting plate 562 follow the same movement. The workpiece 258 to be rolled rotates, and the polyamide sandwich film will be rolled up on the outer wall of the workpiece 258 together with the film-like material, so that the diameter of the workpiece 258 to be rolled increases. At this time, the hot pressing block 68 will be heated and fitted to the outer wall of the film-like material, and a plurality of pressing cylinders will be extended synchronously, so that the polyamide sandwich film and the film-like material rolled up on the workpiece 258 to be rolled will be thermally pressed and stretched.

[0067] When the winding length is reached, the cutting motor 363 will start, causing the first threaded rod 369 to rotate, so that the hot cutter 364 will move along the cutting guide rod 360 toward one end of the waste collection box 211, and the hot cutter 364 will cut the film material to complete the cutting of the polypropylene coated material. Then the pressing positioning motor 65 will be started again to make the conveyor belt 652 rotate and drive, and the pressing mounting plate 64 will be moved to the bottom of the transfer cooling element 67. Then the transfer cylinder 673 will be started to make the output shaft of the transfer cylinder 673 extend to drive the transfer plate 672 to move downward until the bottom surface of the transfer plate 672 is in contact with the outer wall of the polypropylene coating material to cool the polypropylene coating material. At the same time, the two transfer clamping cylinders 678 will be started synchronously to drive the two transfer mounting platforms 674 to approach each other along the preset slide groove 677 until the two transfer buckle blocks 675 are clamped at both ends of the workpiece 258 to be rolled. Then, the transfer motor will be started to make the transfer mounting plate 671 move along the heat sealing frame 23 to transfer the polypropylene coating material to the discharging component 70, and use the discharging component 70 to transfer, discharge and store the manufactured polypropylene coating material.

[0068] For example, in one embodiment: when further stretching is required, the material receiving cylinder 35 will be started, so that the output shaft of the material receiving cylinder 35 will retract and drive the material receiving hot push plate 372 to move upward along the two material receiving guide columns 371, and then the two clamping columns 374 will pull the material receiving rotating rod 373 to move upward, thereby further stretching the polypropylene coating material on the rotating sleeve 375.

[0069] Installation process: The bottom of the cutting frame 21 is fixedly installed on the side of the installation bottom surface adjacent to the extruder 11, the outer side wall of the sandwich frame 221 is fixedly installed on the inner side wall of the cutting frame 21 away from the waste collection box 211, the outer side wall of the stretching frame 222 is fixedly installed on the inner side wall of the sandwich frame 221 adjacent to the waste collection box 211, the outer side wall of the heat sealing frame 23 is fixedly installed on the inner side wall of the sandwich stretching frame 22 adjacent to the waste collection box 211, the conveying seat 24 is fixedly installed on the cutting frame 21, the sandwich stretching frame 22 and the heat sealing frame 23 The bottom is away from the waste collection box 211, one side of the feeding table 251 is located at the bottom of the stretching frame 222 at the end away from the waste collection box 211, and the bottom of the sensor frame 252 is fixed. The cutting frame 21 is fixedly installed on the other side of the feeding table 251, and one end of the sensor frame 252 is fixedly connected to the end of the sandwich frame 221 away from the waste collection box 211. The two cutting slide rails 31 are fixedly installed on both sides of the top of the cutting frame 21. The inner side wall of the spur rack 32 is fixedly installed on the inner side of the top of the cutting frame 21. The bottom of the cutting mounting plate 33 is slidably installed on one end of the top surface of the cutting frame 21, and the driving gear is meshed with the spur rack 32. The bottom of the cutting cylinder 34 is fixedly installed in the cutting cylinder mounting groove 333, and the receiving cylinder 35 is fixedly installed in the middle of the outer side of the bottom surface of the cutting mounting plate 33. The top surface of the cutting element 36 is fixedly installed on the output shaft of the cutting cylinder 34 and is arranged in the cutting frame 21. The middle of the top surface of the cutting plate 361 is fixedly installed in the output shaft of the cutting cylinder 34, and the cutting The four corners of the top surface of the cutting plate 361 are fixedly connected to the bottom ends of the four first guide columns 335 respectively, and the bottom surface of the cutting drive plate 362 is fixedly installed on the outer side walls of multiple positioning mounting strips 366, so that the length direction of the cutting drive plate 362 is the same as the length direction of the cutting drive plate 362, and the cutting motor 363 is fixedly installed on the outer side walls of one of the cutting drive plates 362, and the output shaft of the cutting motor 363 is fixedly connected to one end of the first threaded rod 369, and the two ends of the bottom of the hot cutting knife 364 are slidably installed on one end of the two cutting guide rods 360, and the top ends of the two material receiving guide columns 371 are fixedly installed on the two ends of the outer side of the bottom surface of the cutting mounting plate 33 respectively, and the middle part of the material receiving hot pushing plate 372 is fixedly connected to the output shaft of the material receiving cylinder 35, and the two ends of the material receiving hot pushing plate 372 It is slidably mounted on the middle of the two material receiving guide columns 371, and both ends of the material receiving rotating rod 373 are fixedly mounted on the bottom ends of the two clamping columns 374. The bottom surface of the feeding plate 41 is slidably mounted on the top surface of the stretching frame 222. The middle part of the feeding cylinder 42 is fixedly mounted in the feeding cylinder mounting groove 45. The middle part of the top surface of the feeding mounting plate 43 is fixedly mounted in the output shaft of the feeding cylinder 42. A plurality of feeding clamps 44 are mounted on the bottom of the feeding mounting plate 43 along the length direction. The bottom surface of the interlayer mounting plate 51 is slidably mounted on the top surface of the interlayer frame 221. The middle part of the longitudinal driving cylinder 52 is fixedly mounted in the longitudinal cylinder mounting groove 511. The transverse driving cylinder 53 is fixedly mounted on one end of the top surface of the interlayer mounting plate 51, and the output shaft of the transverse driving cylinder 53 is fixedly connected to the end wall of the driving plate 223.The top surface of the sandwich driving plate 54 is fixedly connected to the output shaft of the longitudinal driving cylinder 52, and the four corners of the top surface of the sandwich driving plate 54 are respectively fixedly connected to the bottom ends of the four sandwich guide rods 513, one end of the bottom surface of the clamping plate 551 is fixedly installed on the output shaft of the clamping cylinder 544, one end of the bottom of the roller mounting platform 554 is fixedly installed on the middle of one end of the clamping plate 551 away from the sandwich mounting platform 541, the micro-control cylinder 552 is fixedly installed on the inner side of the clamping plate 551, and the two ends of the bottom surface of the clamping mounting platform 553 are slidably installed on two micro-control slide rails 5 58, and the output shaft of the micro-control cylinder 552 is fixedly connected to the clamping mounting platform 553, the guide cylinder 555 is fixedly installed on the clamping mounting platform 553 adjacent to the sandwich mounting platform 541, and the output of the guide cylinder 555 is fixedly connected to the guide mounting plate 556 through the guide sliding hole, the end wall of the stretching mounting plate 61 is fixedly installed on the inner side of the feeding platform 251 adjacent to the end of the waste collection box 211, the stretching cylinder 62 is fixedly installed on the top surface of the feeding platform 251 adjacent to the end of the waste collection box 211, and the two bottom ends of the stretching frame 63 are pressed together. The sides are respectively slidably installed in the two stretching slide rails 611, and the output shaft of the stretching cylinder 62 is fixedly connected to the pressing and stretching frame 63. The bottom surface of the pressing mounting plate 64 is slidably arranged on the top surface of the conveying seat 24. The pressing positioning motor 65 is fixedly installed on the inner side of the top surface of the conveying seat 24. The driven wheel 651 is rotatably installed on the outer side of the top surface of the conveying seat 24. The positioning block 641 is fixedly connected to one end of the conveying belt 652. The middle part of the pressing plate 66 is fixedly installed on the output shaft of the pressing driving cylinder 642, and the four corners of the pressing plate 66 are respectively slidably arranged on the top surface of the conveying seat 24. Installed on the top of four pressing guide rods 643, the bottom of the hot pressing block 68 is fixedly installed on the output shafts of multiple pressing cylinders, the bottom of the transfer mounting plate 671 is slidably installed on one end of the top surface of the heat sealing frame 23, the middle of the transfer cylinder 673 is fixedly installed in the transfer cylinder mounting groove 676, the middle of the top surface of the transfer plate 672 is fixedly installed on the output shaft of the transfer cylinder 673, two transfer mounting platforms 674 are slidably installed on two preset slide grooves 677, and two transfer buckle blocks 675 are fixedly installed on the bottom of the inner ends of the two transfer mounting platforms 674.

[0070] The present invention can achieve:

[0071] 1. The polypropylene coating material produced by this process is added with polypropylene resin, 10%-20% of phthalic acid diester, 0.1%-2% of trioctyltin and 20%-30% of magnesium silicate, and the polyamide interlayer film is applied as an interlayer in the polypropylene coating material by thermal method, which effectively improves the flexibility and ductility of the polypropylene coating material, thereby improving the output efficiency. At the same time, it has good heat resistance and mechanical strength, prolongs its service life, helps to reduce the replacement frequency of the polypropylene coating material, and reduces resource consumption and environmental impact.

[0072] 2. The present invention can automatically and efficiently complete the heat-sealing stretching, cutting and winding work. By starting the push cylinder 255, the feeding cylinder 42, the pressing drive cylinder 642, the stretching cylinder 62 and other multiple cylinders and the cutting drive motor 332, the feeding drive motor and other multiple drive motors, the entire work process is automated, the need for manual operation is reduced, and the production efficiency is improved. By starting the pressing positioning motor 65 and the transfer cylinder 673, the workpiece 258 to be rolled and the transfer plate 672 and other components are accurately positioned, ensuring the precise position of the workpiece at different working stages, ensuring the accuracy and consistency of the work. By clamping the clamping jaws 256 and the guide wheels The coordinated action of components such as 557 and roller 561 realizes the clamping and guiding of the workpiece 258 to be rolled and the film-like material, ensures the stability and correctness of the workpiece during movement, and avoids material deviation and dislocation. At the same time, through the heating and extension of the hot pressing block 68 and the pressing cylinder, the thermal pressing and stretching winding of the polyamide interlayer film and the film-like material are realized, ensuring the quality and reliability of the product. Finally, through the start-up of the cutting motor 363 and the transfer cylinder 673, the cutting and transfer of the film-like material are realized. At the same time, the transfer plate 672 and the discharge assembly 70 are used to cool the manufactured polypropylene coating material, ensuring the integrity and cooling effect of the product.

[0073] The above-mentioned embodiments only express several embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A process for preparing a polypropylene coating material, characterized in that: The following steps are involved: Step S1: preparing polypropylene resin, 10%-20% of phthalic acid diester, 0.1%-2% of trioctyltin and 20%-30% of magnesium silicate and preliminarily mixing them to form a prepared material; Step S2: pouring the prepared materials into a high-speed mixer, adding xylene as a solvent, and stirring at a high speed to fully dissolve and mix the prepared materials to form a mixed material; Step S3: introducing the mixed material into an extruder (11) for melting and extrusion to form a film-like material; Step S4: introducing the film-like material into a heat-sealing stretching machine (10), and the heat-sealing stretching machine (10) heat-seals, stretches, cuts, and rolls up the film-like material and the polyamide interlayer film to produce the desired polypropylene coating material; The heat sealing stretching machine (10) described in the above step S4 comprises a heat sealing stretching frame (20), a material receiving and cutting assembly (30), a feeding assembly (40), a sandwich assembly (50), a pressing assembly (60) and a discharging assembly (70), wherein the heat sealing stretching frame (20) comprises a cutting frame (21), a sandwich stretching frame (22), a heat sealing frame (23), a conveying seat (24) and a feeding frame (25), wherein the bottom of the cutting frame (21) is fixedly mounted on a side of the installation bottom surface adjacent to the extruder (11), and a waste collection box (211) is provided at one end of the cutting frame (21) away from the extruder (11), one end of the outer side wall of the sandwich stretching frame (22) is fixedly mounted on one end of the inner side wall of the cutting frame (21) away from the waste collection box (211), and one end of the outer side wall of the heat sealing frame (23) away from the waste collection box (211) is fixedly mounted on the inner side of the sandwich stretching frame (22). The side wall is adjacent to one end of the waste collection box (211); the conveying seat (24) is fixedly installed on the cutting frame (21), the sandwich stretching frame (22) and the bottom of the heat sealing frame (23) away from the waste collection box (211); the feeding frame (25) is fixedly installed on the end of the sandwich stretching frame (22) away from the waste collection box (211); the material receiving and cutting assembly (30) is slidably installed in the cutting frame (21); the feeding assembly (40) is slidably installed in the feeding frame (25); the sandwich assembly (50) is slidably installed on the outside of the sandwich stretching frame (22); the pressing assembly (60) is slidably installed in the heat sealing frame (23) and the conveying seat (24); the discharging assembly (70) is installed on the inner side wall of the heat sealing frame (23) adjacent to one end of the waste collection box (211); and the discharging assembly (70) is used for transferring, discharging and storing the manufactured polypropylene film material.

2. The process for preparing a polypropylene coating material according to claim 1, characterized in that: A conveying frame (212) is arranged in the middle of the cutting frame (21). The conveying frame (212) is arranged adjacent to the extruder (11) and is used to guide and convey the film-like material. The sandwich stretching frame (22) comprises a sandwich frame (221) and a stretching frame (222). The outer side wall of the sandwich frame (221) is fixedly mounted on the inner side wall of the cutting frame (21) away from the end of the waste collection box (211). The outer side wall of the stretching frame (222) is fixedly mounted on the inner side wall of the sandwich frame (221) adjacent to the end of the waste collection box (211). A driving plate (223) is protrudingly arranged on the top surface of the sandwich frame (221) adjacent to the end of the waste collection box (211). The feeding frame (25) comprises a feeding platform (251) and a sensor frame (252). One side of the feeding platform (251) is located at the bottom of the end of the stretching frame (222) away from the waste collection box (211). The bottom of the sensor frame (252) is fixedly installed on the other side of the feeding platform (251), and one end of the sensor frame (252) is fixedly connected to the end of the interlayer frame (221) away from the waste collection box (211). The top surface of the feeding platform (251) is concavely provided with a feeding sliding groove (253), and a feeding pushing plate (254) is slidably arranged in the feeding sliding groove (253). A pushing cylinder (255) is arranged on one side of the feeding platform (251), and the output shaft of the pushing cylinder (255) is fixedly connected to the feeding pushing plate (254). Clamping claws (256) are arranged on both sides of the feeding pushing plate (254). A discharge platform (257) is arranged at both ends of the top surface of the feeding platform (251), and a plurality of workpieces to be rolled (258) are arranged on the discharge platform (257) along the length direction. The sensor frame (252) is used to identify and draw lines on the workpieces to be rolled (258).

3. The process for preparing the polypropylene coating material according to claim 2, characterized in that: The material receiving and cutting assembly (30) comprises two cutting slide rails (31), a spur rack (32), a cutting mounting plate (33), a cutting cylinder (34), a material receiving cylinder (35), a cutting element (36) and a material receiving element (37). The two cutting slide rails (31) are fixedly mounted on both sides of the top of the cutting frame (21). The inner side wall of the spur rack (32) is fixedly mounted on the inner side of the top of the cutting frame (21). The bottom of the cutting mounting plate (33) is slidably mounted on one end of the top surface of the cutting frame (21). A cutting motor mounting groove (331) is concavely provided in the middle of the inner side of the bottom surface of the cutting mounting plate (33). A cutting drive motor (332) is arranged in the cutting motor mounting groove (331). The output shaft of the cutting drive motor (332) is provided with a driving gear, which is meshed and connected with the spur rack (32). The bottom surface of the cutting mounting plate (33) is provided with a driving gear. A cutting cylinder mounting groove (333) is provided through the bottom of the cutting cylinder (34), the bottom of the cutting cylinder (34) is fixedly mounted in the cutting cylinder mounting groove (333), first guide holes (334) are respectively provided through the four corners in the middle of the bottom surface of the cutting mounting plate (33), and first guide columns (335) are slidably arranged on the four first guide holes (334), claw mounting plates (336) are respectively convexly provided at both ends of the bottom surface of the cutting mounting plate (33), and electric-controlled claws (337) are obliquely convexly provided at the bottom of the outer side walls of the two claw mounting plates (336), a material receiving cylinder (35) is fixedly mounted in the middle of the outer side of the bottom surface of the cutting mounting plate (33), the top surface of the cutting element (36) is fixedly mounted on the output shaft of the cutting cylinder (34) and is arranged in the cutting frame (21), and the top of the material receiving element (37) is fixedly mounted on the output shaft of the material receiving cylinder (35).

4. The process for preparing the polypropylene coating material according to claim 3, characterized in that: The cutting element (36) comprises a cutting plate (361), a cutting drive plate (362), a cutting motor (363) and a hot cutting knife (364). The middle of the top surface of the cutting plate (361) is fixedly installed in the output shaft of the cutting cylinder (34), and the four corners of the top surface of the cutting plate (361) are respectively fixedly connected to the bottom ends of four first guide columns (335). A plurality of cutting installation strips (365) are protruded along the length direction on the inner side of the bottom surface of the cutting plate (361), and a positioning installation strip (366) is obliquely protruded at the bottom of the outer side wall of each cutting installation strip (365). The bottom surface of the cutting drive plate (362) is fixedly installed on the outer side walls of the plurality of positioning installation strips (366), so that the length direction of the cutting drive plate (362) is the same as the length direction of the cutting drive plate (362). Cutting mounting blocks (367) are respectively convexly provided at both ends of the top surface of the plate (362), and first rotating holes (368) are respectively penetrated through the middle of the two cutting mounting blocks (367), and a first threaded rod (369) is arranged between the two first rotating holes (368). The cutting motor (363) is fixedly installed on the outer side wall of one of the cutting drive plates (362), and the output shaft of the cutting motor (363) is fixedly connected to one end of the first threaded rod (369). Two cutting guide rods (360) are also arranged between the inner side walls of the two cutting mounting blocks (367), and the two ends of the bottom of the hot cutting knife (364) are slidably installed on one end of the two cutting guide rods (360), and the bottom of the hot cutting knife (364) is also penetrated with a threaded hole and is installed on one end of the first threaded rod (369) through the threaded hole.

5. The process for preparing the polypropylene coating material according to claim 4, characterized in that: The material receiving element (37) comprises two material receiving guide columns (371), a material receiving hot push plate (372) and a material receiving rotating rod (373). The top ends of the two material receiving guide columns (371) are respectively fixedly mounted on the two ends of the outer side of the bottom surface of the cutting mounting plate (33). The middle part of the material receiving hot push plate (372) is fixedly connected to the output shaft of the material receiving cylinder (35). The two ends of the material receiving hot push plate (372) are slidably mounted on the middle parts of the two material receiving guide columns (371). The two ends of the bottom surface of the material receiving hot push plate (372) are convexly provided with clamping columns (374). The two ends of the material receiving rotating rod (373) are fixedly mounted on the bottom ends of the two clamping columns (374). A rotating sleeve (375) is rotatably arranged on the middle part of the outer wall of the material receiving rotating rod (373).

6. The process for preparing the polypropylene coating material according to claim 5, characterized in that: The feeding assembly (40) comprises a feeding plate (41), a feeding cylinder (42), a feeding mounting plate (43) and a plurality of feeding clamps (44); the bottom surface of the feeding plate (41) is slidably mounted on the top surface of the stretching frame (222); a feeding drive motor is arranged inside the feeding plate (41); a feeding cylinder mounting groove (45) is provided through the middle of the feeding plate (41); the middle of the feeding cylinder (42) is fixedly mounted in the feeding cylinder mounting groove (45); the middle of the top surface of the feeding mounting plate (43) is fixedly mounted in the output shaft of the feeding cylinder (42); and a plurality of feeding clamps (44) are mounted on the bottom of the feeding mounting plate (43) along the length direction for grabbing and transporting the workpiece (258) to be rolled.

7. The process for preparing a polypropylene coating material according to claim 6, characterized in that: The sandwich assembly (50) comprises a sandwich mounting plate (51), a longitudinal driving cylinder (52), a transverse driving cylinder (53), a sandwich driving plate (54) and a clamping element (55). The bottom surface of the sandwich mounting plate (51) is slidably mounted on the top surface of the sandwich frame (221). The inner side of the top surface of the sandwich mounting plate (51) is concavely provided with a longitudinal cylinder mounting groove (511). The middle part of the longitudinal driving cylinder (52) is fixedly mounted in the longitudinal cylinder mounting groove (511). The four corners of the middle part of the top surface of the sandwich mounting plate (51) are respectively penetrated by sandwich sliding holes (512). Each sandwich sliding hole (512) is slidably provided with a sandwich guide rod (513). The transverse driving cylinder (53) is fixedly mounted on one end of the top surface of the sandwich mounting plate (51), and the output shaft of the transverse driving cylinder (53) is fixedly connected to the end wall of the driving plate (223). The top surface of the sandwich driving plate (54) is fixedly connected to the output shaft of the longitudinal driving cylinder (52), and the four corners of the top surface of the sandwich driving plate (54) are respectively fixedly connected to the bottom ends of the four sandwich guide rods (513). The top surface of the sandwich driving plate (54) away from the waste collection box (211) and the middle part are respectively provided with sandwich mounting platforms (541). A sandwich rotating shaft (542) is rotatably arranged between the tops of the two sandwich mounting platforms (541). A rotating motor is arranged at one end of the sandwich rotating shaft (542). A polyamide sandwich film is rolled up on the sandwich rotating shaft (542). A clamping cylinder mounting groove (543) is concavely penetrated at one end of the inner side of the sandwich driving plate (54) away from the sandwich mounting platform (541). A clamping cylinder (544) is arranged in the clamping cylinder mounting groove (543). The clamping element (55) is fixedly installed on the output shaft of the clamping cylinder (544).

8. The process for preparing a polypropylene coating material according to claim 7, characterized in that: The clamping element (55) comprises a clamping plate (551), a micro-control cylinder (552), a roller mounting platform (554), a clamping mounting platform (553), a guide cylinder (555), a guide mounting plate (556) and a plurality of guide wheels (557). One end of the bottom surface of the clamping plate (551) is fixedly mounted on the output shaft of the clamping cylinder (544). Micro-control slide rails (558) are respectively provided at both ends of the outer side of the clamping plate (551). One end of the bottom surface of the roller mounting platform (554) is fixedly mounted on the middle part of one end of the clamping plate (551) away from the interlayer mounting platform (541). A roller cylinder (550) is provided on the top of the roller mounting platform (554). A roller (561) is provided on the output shaft of the roller cylinder (550). The micro-control cylinder (552) is fixedly mounted on the On the inner side of the clamping plate (551), both ends of the bottom surface of the clamping mounting platform (553) are slidably mounted on two micro-control slide rails (558), and the output shaft of the micro-control cylinder (552) is fixedly connected to the clamping mounting platform (553), and a guide sliding hole is concavely provided through one end of the clamping mounting platform (553), and the guide cylinder (555) is fixedly mounted on one end of the clamping mounting platform (553) adjacent to the interlayer mounting platform (541), and the output of the guide cylinder (555) is fixedly connected to the guide mounting plate (556) through the guide sliding hole, and a guide wheel mounting plate (562) is provided at the bottom of one end of the guide mounting plate (556) adjacent to the interlayer mounting platform (541), and a plurality of guide wheels (557) are rotatably mounted on the top surface of the guide wheel mounting plate (562) along the length direction.

9. The process for preparing a polypropylene coating material according to claim 8, characterized in that: The pressing assembly (60) comprises a stretching mounting plate (61), a stretching cylinder (62), a pressing stretching frame (63), a pressing mounting plate (64), a pressing positioning motor (65), a driven wheel (651), a pressing plate (66), a hot pressing block (68) and a transfer cooling element (67). The end wall of the stretching mounting plate (61) is fixedly mounted on the inner side of the feeding platform (251) adjacent to one end of the waste collection box (211). Both sides of the top surface of the stretching mounting plate (61) are respectively provided with stretching slide rails (611). The stretching cylinder (62) is fixedly mounted on the top of the feeding platform (251). The surface is adjacent to one end of the waste collection box (211), the two sides of the bottom of the pressing and stretching frame (63) are respectively slidably installed in the two stretching slide rails (611), and the output shaft of the stretching cylinder (62) is fixedly connected to the pressing and stretching frame (63), the top and bottom of the pressing and stretching frame (63) are respectively rotatably provided with driving wheels (631), and the driving wheel (631) at the bottom is also provided with a micro motor (632), the bottom surface of the pressing installation plate (64) is slidably arranged on the top surface of the conveying seat (24), and the pressing positioning motor (65) is fixedly installed on the inner side of the top surface of the conveying seat (24), A driven wheel (651) is rotatably mounted on the outer side of the top surface of the conveying seat (24); a conveying belt (652) is sleeved between the driven wheel (651) and the output shaft of the pressing positioning motor (65); a positioning block (641) is convexly mounted on the top surface of the pressing mounting plate (64); the positioning block (641) is fixedly connected to one end of the conveying belt (652); a pressing driving cylinder (642) is arranged in the middle of the top surface of the pressing mounting plate (64); pressing guide rods (643) are convexly mounted at the four corners of the top surface of the pressing mounting plate (64); and a pressing driving cylinder (642) is fixedly mounted on the middle of the pressing plate (66). The top of the press plate (66) is provided with a plurality of press cylinders (642) and a plurality of press cylinders (643) are provided on the top of the press plate (66). The four corners of the press plate (66) are respectively slidably mounted on the tops of the four press guide rods (643). The top ends of the press plate (66) are provided with a placing platform (661). The top surface of the placing platform (661) is provided with a placing groove (662). The placing groove (662) is used to place the workpiece (258) to be rolled. The top surface of the press plate (66) is provided with a plurality of press cylinders along the length direction. The bottom of the hot pressing block (68) is fixedly mounted on the output shafts of the plurality of press cylinders. The transfer cooling element (67) is slidably mounted on the heat sealing frame (23).The transfer cooling element (67) comprises a transfer mounting plate (671), a transfer cylinder (673), a transfer plate (672), two transfer mounting platforms (674) and two transfer buckle blocks (675). The bottom surface of the transfer mounting plate (671) is slidably mounted on one end of the top surface of the heat sealing frame (23). A transfer motor is arranged inside the transfer mounting plate (671). A transfer cylinder mounting groove (676) is provided in the middle of the transfer mounting plate (671). The middle of the transfer cylinder (673) is fixedly mounted in the transfer cylinder mounting groove (676). 76), the middle part of the top surface of the transfer plate (672) is fixedly mounted on the output shaft of the transfer cylinder (673), and preset slide grooves (677) are respectively recessed at both ends of the top surface of the transfer plate (672), and two transfer mounting platforms (674) are slidably mounted on the two preset slide grooves (677), and a transfer clamping cylinder (678) is further arranged between the inner ends of the two transfer mounting platforms (674) and the two ends of the transfer mounting plate (671), and two transfer buckle blocks (675) are fixedly mounted on the bottom of the inner ends of the two transfer mounting platforms (674). ; 10. The process for preparing a polypropylene coating material according to claim 1, characterized in that: Step S4 includes the following steps: Step S41: Start the push cylinder (255) to make the feeding push plate (254) slide inward along the feeding sliding groove (253) to move the workpiece (258) to be rolled to the bottom of the feeding mounting plate (43), then start the feeding cylinder (42) and use a plurality of feeding clamps (44) to clamp the workpiece (258) to be rolled; Step S42: Start the feeding drive motor, move the feeding plate (41) to the bottom of the pressing plate (66), and place it between the two placement tables (661), then start the pressing positioning motor (65), so that the positioning block (641) and the pressing stretching frame (63) are arranged opposite to each other; Step S43: Start the pressing driving cylinder (642) to move the workpiece (258) to be rolled on the pressing plate (66) to a position between the two driving wheels (631), and then start the stretching cylinder (62) to clamp the workpiece (258) to be rolled between the two driving wheels (631) of the pressing and stretching frame (63), thereby completing the preparation work; Step S44: the film-like material extruded by the extruder (11) is sequentially passed through the rotating sleeve (375), the conveying frame (212) and the interlayer assembly (50) and rolled onto the workpiece (258) to be rolled on the two placement tables (661), and then the micro motor (632) is started to rotate the workpiece (258) to perform heat sealing and stretching operations; Step S45: Start the micro-control cylinder (552) and the guide cylinder (555), so that the multiple guide wheels (557) on the guide wheel mounting plate (562) move synchronously, and the combined roller (5610) guides the polyamide sandwich film, so that the polyamide sandwich film is smoothly sent into the film-like material and adhered to the film-like material. As the workpiece (258) to be rolled rotates, the polyamide sandwich film will be rolled together with the film-like material on the outer wall of the workpiece (258) to be rolled; Step S46: multiple pressing cylinders are started synchronously to perform thermal pressing and stretching and winding on the polyamide interlayer film and the film-like material on the workpiece (258); Step S47: When the winding length is reached, the cutting motor (363) will start, so that the hot cutter (364) will move along the cutting guide rod (360) toward one end of the waste collection box (211), and the hot cutter (364) will be used to cut the film material to complete the automatic cutting of the polypropylene coated material.

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