A method for producing a low-temperature heat-sealable film and a production apparatus therefor

Abstract

The application relates to the technical field of heat-seal film preparation, and particularly discloses a preparation method and a preparation device of low-temperature heat-seal film, which comprise a base, the top of the base is provided with two supports and two fixed plates, one side of the two fixed plates is provided with a fixing mechanism, the base is provided with a feeding mechanism below the fixing mechanism, the two supports are provided with a cleaning mechanism, the cleaning mechanism comprises two groups of moving plates, and the two sides of the outer wall of one moving plate are provided with edge cutting mechanisms. In the application, the low-temperature heat-seal film prepared by the preparation method has better heat-seal performance, and the service life and stability can be improved; after the low-temperature heat-seal film is prepared, the two ends of the low-temperature heat-seal film are cut off by the two first cutting knives in the preparation device, the low-temperature heat-seal film does not need to be cut again, the quality and efficiency of the low-temperature heat-seal film preparation are improved, and it is ensured that the prepared low-temperature heat-seal film can meet the requirements of customers.

Description

Technical Field

[0001] This invention relates to the field of heat-sealing film preparation technology, specifically to a method and apparatus for preparing a low-temperature heat-sealing film. Background Technology

[0002] Low-temperature heat-sealable film is a new type of packaging material, typically composed of a three-layer composite film: a bottom layer made of materials such as polyethylene, polypropylene, and EVA; a middle layer made of materials such as PET and BOPP; and a top layer made of materials such as polypropylene. Low-temperature heat-sealable film has good heat-sealing performance and high transparency, effectively protecting and displaying goods. It is widely used in the food, pharmaceutical, and cosmetic industries. In the food industry, it is used to package various candies, biscuits, sushi, and other products, maintaining their freshness and taste. In the pharmaceutical industry, it is used to package pharmaceuticals and medical devices, offering excellent airtightness and moisture retention. In the cosmetics industry, it is used to package various beauty and skincare products and makeup products.

[0003] In existing technologies for preparing low-temperature heat-sealable films, factors such as equipment, processes, and materials can lead to inconsistent stability and irregularities at the edges, including burrs or deviations from standard dimensions. Edge trimming can remove these non-compliant parts, allowing the film to achieve the desired size and shape, significantly improving the quality of the low-temperature heat-sealable film and meeting customer needs. However, existing trimming mechanisms use a single, integrated blade. When cutting the film to different widths for rewinding, the blade needs to be disassembled and replaced, which is cumbersome and reduces trimming efficiency and quality, negatively impacting the overall production process. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art by proposing a method and apparatus for preparing a low-temperature heat-sealing film.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A low-temperature heat-sealing film preparation apparatus includes a base, on the top of which two supports and two fixing plates are respectively installed. A conveying roller is installed inside the base. A fixing mechanism for fixing both ends of the roll is provided on the side of the two fixing plates that are close to each other. A feeding mechanism for automatically discharging the wound heat-sealing film downwards is provided below the fixing mechanism on the base. Two cleaning mechanisms for cleaning debris from the surface of the heat-sealing film are installed between the two supports. The cleaning mechanism includes two sets of parallel moving plates. Both outer walls of one of the moving plates are provided with an edge-cutting mechanism for trimming the heat-sealing film.

[0007] Optionally, the fixing mechanism includes a first electric telescopic rod installed on one side of two fixing plates that are close to each other. The telescopic ends of the two first electric telescopic rods are each equipped with a fixing block, and the two ends of the drum are respectively fitted onto the outer walls of the two fixing blocks.

[0008] Optionally, a first sliding groove is provided on the outer wall of the two adjacent sides of the brackets. A double-ended lead screw and a sliding rod are respectively installed inside the two first sliding grooves. Two first sliders are symmetrically installed on the outer wall of the double-ended lead screw and the sliding rod. A moving block is installed on the end of the multiple first sliders away from the first sliding groove.

[0009] Optionally, a second sliding groove is provided on the outer wall of the multiple movable blocks on the side away from the first sliding block, and two second sliding blocks are installed inside the multiple second sliding grooves. The two ends of the two sets of movable plates are respectively rotatably connected to the second sliding blocks that are close to them.

[0010] Optionally, a thickness sensor and a laser sensor are respectively installed on the outer wall of the two sets of moving plates that are close to each other. A cleaning pad is installed on the outer wall of the two sets of moving plates that are close to each other. The interior of the multiple cleaning pads is provided with through grooves for the thickness sensor and the laser sensor. A rubber pad is installed on the outer wall of the two sets of moving plates that are far apart from each other.

[0011] Optionally, the cutting mechanism includes a third slide groove formed on the outer walls of both sides of one of the movable plates, a third slider installed inside each of the two third slide grooves, a rotating rod rotatably mounted on the end of each of the two third sliders away from the third slide groove, and a first cutting blade threadedly mounted on the end of each of the two rotating rods away from the third sliders via two bolts.

[0012] Optionally, a rotating plate is rotatably mounted on the side of one of the movable plates near the drum, and a sponge pad is mounted on the end of the rotating plate away from the movable plate.

[0013] Optionally, a fourth groove is provided on one side of the outer wall of another movable plate, a fourth slider is installed inside the fourth groove, a rotating block is rotatably installed at the end of the fourth slider away from the fourth groove, and a second cutting blade is rotatably installed on the top of the rotating block.

[0014] Optionally, the feeding mechanism includes two second electric telescopic rods installed inside the base. The telescopic ends of the two second electric telescopic rods are jointly mounted with a mounting plate. An abutment plate is slidably mounted on the top of the mounting plate. Multiple springs are installed between the abutment plate and the mounting plate. An arc-shaped frame is rotatably mounted on one outer wall of the abutment plate. A contact switch is mounted at the center of the top of the mounting plate. A protrusion for pressing the contact switch is mounted on the bottom of the abutment plate.

[0015] Optionally, a method for preparing a low-temperature heat-sealing film includes the preparation apparatus described above, and the preparation method further includes the following steps:

[0016] Step 1: Raw material ratio: Select suitable raw materials for preparing low-temperature heat-sealing film, including 68% polypropylene, 14% EVA, 11% modified EPDM rubber powder, 1.2% antioxidant, 1.4% light stabilizer and 4.4% other materials;

[0017] Step 2: Raw material processing: Put the measured raw materials into a high-speed mixer for mixing and stirring. The stirring temperature is 22-32 degrees Celsius, the stirring speed is 300-500 rpm, and the stirring time is 6 min-22 min.

[0018] Step 3: Extrusion operation: Feed the uniformly mixed raw materials from Step 2 into the extruder, control the internal temperature of the extruder to 178-197 degrees Celsius, melt the raw materials, and then extrude the molten material through the casting die into a low-temperature heat-sealing film.

[0019] Step 4: Cooling corona treatment. The extruded low-temperature heat-sealing film obtained in Step 3 is cooled and then subjected to corona treatment to obtain the finished low-temperature heat-sealing film.

[0020] Step 5: Low-temperature heat-sealing film edge trimming and winding: The low-temperature heat-sealing film cooled in Step 4 is rotated by the preparation device mentioned above, so that the roll can be wound into a roll. The wound low-temperature heat-sealing film is then cut by a low-temperature heat-sealing film slitting device to obtain the wound and cut low-temperature heat-sealing film.

[0021] The beneficial effects of this invention are:

[0022] 1. In this invention, the low-temperature heat-sealing film prepared by this method has better heat-sealing performance, and its service life and stability are also improved. After the low-temperature heat-sealing film is prepared through steps one, two, three, and four, the excess parts at both ends of the low-temperature heat-sealing film are cut off by two first cutting blades in the preparation device, eliminating the need to re-unroll and trim the edges of the wound low-temperature heat-sealing film, thus improving the quality and efficiency of the low-temperature heat-sealing film preparation and ensuring that the prepared low-temperature heat-sealing film meets customer needs. Moreover, the distance between the two first cutting blades can be adjusted arbitrarily, making it convenient to cut the low-temperature heat-sealing film into different widths for winding, thus improving the applicability of the first cutting blades.

[0023] 2. In this invention, when the low-temperature heat-sealing film is conveyed between two sets of moving plates, the two sets of moving plates are controlled to move towards each other, causing the two cleaning pads to come into close contact with both sides of the low-temperature heat-sealing film. The debris attached to the surface of the low-temperature heat-sealing film can be automatically cleaned and removed by the two sets of cleaning pads, avoiding the problem of debris being rolled up inside the low-temperature heat-sealing film and affecting the subsequent use of the low-temperature heat-sealing film.

[0024] 3. In this invention, thickness sensors and laser sensors are respectively installed on the outer wall of the two sets of moving plates near the cleaning pad. When the low-temperature heat-sealing film passes between the two sets of moving plates, the thickness and flatness of the low-temperature heat-sealing film can be automatically detected, so that the low-temperature heat-sealing film is rolled up after detection. If the low-temperature heat-sealing film fails the detection, the rolling process can be stopped in time, reducing the adverse effects caused by the failure of the low-temperature heat-sealing film.

[0025] 4. In this invention, as the roll continuously winds the low-temperature heat-sealing film, the diameter of the low-temperature heat-sealing film roll will increase until the outer wall of the low-temperature heat-sealing film roll contacts the top of the abutment plate and is squeezed and pushed against it. This causes the protrusion at the bottom of the abutment plate to press the contact switch, causing the second cutting blade to cut the low-temperature heat-sealing film. The telescopic ends of the two first electric telescopic rods retract, causing the roll to fall downwards to the top of the abutment plate. By controlling the arc frame to rotate downwards and controlling the double-headed screw to drive one of the moving plates near the roll to move, the wound low-temperature heat-sealing film roll is pushed downwards from the top of the abutment plate and the arc frame and discharged, achieving the effect of automatic unloading. Attached Figure Description

[0026] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0027] Figure 1 This is a schematic diagram of the overall structure of a low-temperature heat-sealing film preparation device proposed in this invention;

[0028] Figure 2 for Figure 1 A structural diagram from another angle;

[0029] Figure 3 This is a schematic diagram of the structure in this invention where the double-ended screw and slide bar are separated from the first slide groove;

[0030] Figure 4 This is a schematic diagram of the structure in which the second slider and the second groove are separated in this invention;

[0031] Figure 5 This is a schematic diagram of the structure of one of the movable plates in this invention;

[0032] Figure 6 This is a schematic diagram of the structure of the first cutting blade in this invention;

[0033] Figure 7 This is a schematic diagram of the structure of the other two movable plates in this invention;

[0034] Figure 8 This is a schematic diagram of the structure of the second cutting blade in this invention;

[0035] Figure 9 This is a schematic diagram of the fixing mechanism and the drum in this invention;

[0036] Figure 10 This is a schematic diagram of the feeding mechanism in this invention;

[0037] Figure 11 This is a schematic diagram of the structure in this invention where the abutment plate and the mounting plate are separated.

[0038] In the diagram: 1. Base; 2. Bracket; 3. Fixing plate; 4. Drum; 5. Conveying roller; 6. Moving block; 7. Moving plate; 8. First cutting blade; 9. Second electric telescopic rod; 10. Abutment plate; 11. Double-ended lead screw; 12. First slider; 13. Second slider; 14. Cleaning pad; 15. Through groove; 16. Rubber pad; 17. Third slide groove; 18. Third slider; 19. Rotating rod; 20. Sponge pad; 21. Second cutting blade; 22. Fourth slide groove; 23. Fourth slider; 24. Rotating block; 25. First electric telescopic rod; 26. Fixing block; 27. Mounting plate; 28. Arc frame; 29. ​​Spring; 30. Contact switch; 31. Second slide groove; 32. First slide groove. Detailed Implementation

[0039] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Reference Figures 1-11 A low-temperature heat-sealing film preparation apparatus includes a base 1. Two supports 2 and two fixing plates 3 are respectively installed on the top of the base 1. A conveying roller 5 is installed inside the base 1. A fixing mechanism for fixing both ends of a roll 4 is provided on the side of the two fixing plates 3 that are close to each other. A feeding mechanism for automatically discharging the wound heat-sealing film downwards is provided below the fixing mechanism on the base 1. Two cleaning mechanisms for cleaning debris on the surface of the heat-sealing film are installed between the two supports 2. The cleaning mechanism includes two sets of parallel moving plates 7. One of the moving plates 7 has an edge-cutting mechanism on both outer walls for cutting the heat-sealing film.

[0041] As an optimized technical solution of the present invention, the fixing mechanism includes first electric telescopic rods 25 installed on the side of two fixing plates 3 that are close to each other. Each telescopic end of the two first electric telescopic rods 25 is equipped with a fixing block 26, and both ends of the roll 4 are respectively fitted onto the outer walls of the two fixing blocks 26. In actual use, a first drive motor is pre-installed on the outer wall of the side of the two fixing plates 3 that is far apart from each other. The output ends of the two first drive motors are respectively connected to the two first electric telescopic rods 25, thereby enabling the two first electric telescopic rods 25, the fixing blocks 26, and the fixed roll 4 to rotate together, thus winding up the low-temperature heat-sealing film.

[0042] As a technical optimization of the present invention, a first sliding groove 32 is provided on the outer wall of the two supports 2 that are close to each other. A double-ended lead screw 11 and a sliding rod are respectively installed inside the two first sliding grooves 32. Two first sliders 12 are symmetrically installed on the outer wall of the double-ended lead screw 11 and the sliding rod. A moving block 6 is installed on the end of the multiple first sliders 12 that is away from the first sliding groove 32. A second drive motor is preset on the outer wall of one of the supports 2. The output end of the second drive motor is connected to one end of the double-ended lead screw 11, so that it can drive the two first sliders 12 to move in a direction that is close to or far away from each other.

[0043] As a technical optimization of the present invention, a second sliding groove 31 is provided on the outer wall of the multiple moving blocks 6 on the side away from the first slider 12. Two second sliders 13 are installed inside each of the multiple second sliding grooves 31. The two ends of the two sets of moving plates 7 are rotatably connected to the second sliders 13 that are close to each other. A double-ended screw is preset inside each of the multiple second sliding grooves 31. The two ends of the double-ended screw pass through the two second sliders 13 respectively, so that it drives the two second sliders 13 to move towards each other or away from each other during rotation. A third drive motor is preset inside each of the four second sliders 13. The output end of the third drive motor is connected to the rotating part of the moving plate 7 that is close to each other, so as to drive the moving plate 7 to rotate and adjust.

[0044] As a technical optimization of the present invention, a thickness sensor and a laser sensor are respectively installed on the outer wall of the two sets of moving plates 7 that are close to each other. A cleaning pad 14 is installed on the outer wall of the two sets of moving plates 7 that are close to each other. Each cleaning pad 14 has a through groove 15 for use by the thickness sensor and the laser sensor. A rubber pad 16 is installed on the outer wall of the two sets of moving plates 7 that are far apart from each other. The thickness sensor is a thickness sensor of model HPS-CFL054 in the prior art, which can detect whether the thickness of the low-temperature heat-sealing film is qualified. The laser sensor measures the height difference of the surface of the object being measured by a laser beam to determine the flatness of the surface of the object being measured, thereby it can be used to detect the flatness of the surface of the low-temperature heat-sealing film. The laser sensor is a laser sensor of model LR-ZH500N in the prior art. The cleaning pad 14 set on the side of the two sets of moving plates 7 that are close to each other can automatically clean the debris attached to the surface of the low-temperature heat-sealing film when it passes between the two sets of moving plates 7, so as to avoid the debris being rolled up inside the low-temperature heat-sealing film and affecting the subsequent use of the low-temperature heat-sealing film.

[0045] As a technical optimization of the present invention, the edge-cutting mechanism includes third sliding grooves 17 formed on the outer walls of both sides of one of the movable plates 7. Third sliders 18 are installed inside each of the two third sliding grooves 17. Rotating rods 19 are rotatably mounted on the ends of the two third sliders 18 away from the third sliding grooves 17. First cutting blades 8 are threadedly mounted on the ends of the two rotating rods 19 away from the third sliders 18 via two bolts. First linear motors are pre-installed inside each of the two third sliding grooves 17, which can drive the third sliders 18 to move back and forth within the third sliding grooves 17. The rotating rods 19 are rotatably connected to the third sliders 18 via electric rotating shafts at both ends. The electric rotating shafts can be driven to rotate by an externally pre-installed first driving device, thereby adjusting the first cutting blades 8. The first cutting blades 8 are connected to the rotating rods 19 via bolts, facilitating the disassembly and replacement of dulled first cutting blades 8.

[0046] As a technical optimization of the present invention, a rotating plate is rotatably mounted on the side of one of the movable plates 7 near the drum 4, and a sponge pad 20 is mounted on the end of the rotating plate away from the movable plate 7. The rotating plate is rotatably connected to the outer wall of one of the movable plates 7 through drive shafts provided at both ends. One end of the drive shaft can be connected to the output end of a preset external second drive device, thereby driving the rotating plate and the sponge pad 20 to rotate and adjust. Multiple liquid outlet holes are opened at the end of the rotating plate near the sponge pad 20. The rotating plate can be connected to the output end of a preset external liquid outlet mechanism through a hose, so that the multiple liquid outlet holes can deliver water or easily volatile liquids to the inside of the sponge pad 20 for adsorption and storage.

[0047] As a technical optimization of the present invention, a fourth sliding groove 22 is provided on one outer wall of another movable plate 7. A fourth slider 23 is installed inside the fourth sliding groove 22. A rotating block 24 is rotatably installed at the end of the fourth slider 23 away from the fourth sliding groove 22. A second cutting blade 21 is rotatably installed on the top of the rotating block 24. A second linear motor is preset inside the fourth sliding groove 22, which can drive the fourth slider 23 to move back and forth inside the fourth sliding groove 22. A fourth drive motor is preset inside the fourth slider 23, and the output end of the fourth drive motor is connected to the rotating part of the rotating block 24, thereby driving the rotating block 24 to rotate and adjust. A fifth drive motor is preset inside the rotating block 24, and the output end of the fifth drive motor is connected to the second cutting blade 21, thereby driving the second cutting blade 21 to rotate and adjust.

[0048] As a technical optimization of the present invention, the feeding mechanism includes two second electric telescopic rods 9 installed inside the base 1. The telescopic ends of the two second electric telescopic rods 9 are jointly mounted with a mounting plate 27. An abutment plate 10 is slidably mounted on the top of the mounting plate 27. A plurality of springs 29 are installed between the abutment plate 10 and the mounting plate 27. An arc-shaped frame 28 is rotatably mounted on one side of the outer wall of the abutment plate 10. A contact switch 30 is mounted at the center of the top of the mounting plate 27. A protrusion for pressing the contact switch 30 is mounted on the bottom of the abutment plate 10. A third driving device is pre-installed on one side of the outer wall of the abutment plate 10. The output end of the third driving device is connected to the rotating part of the arc frame 28, thereby driving the arc frame 28 to rotate and adjust. The telescopic ends of the two second electric telescopic rods 9 can drive the mounting plate 27 and the abutment plate 10 to move upward together to a position close to the drum 4. As more and more low-temperature heat-sealing film is wound on the surface of the drum 4, the outer wall of the low-temperature heat-sealing film roll contacts the top of the abutment plate 10 and squeezes and pushes it, causing the protrusion at the bottom of the abutment plate 10 to press the contact switch 30, causing the telescopic ends of the two first electric telescopic rods 25 to retract, so that the drum 4 falls downward to the top of the abutment plate 10. Since one end of the drum 4 is blocked by one of the moving plates 7, it can only be discharged downward by controlling the arc frame 28 to rotate downward, thus achieving the effect of automatic material feeding.

[0049] As a technical optimization of the present invention, a method for preparing a low-temperature heat-sealing film includes the preparation apparatus described above, and the preparation method further includes the following steps:

[0050] Step 1: Raw material ratio: Select suitable raw materials for preparing low-temperature heat-sealing film, including 68% polypropylene, 14% EVA, 11% modified EPDM rubber powder, 1.2% antioxidant, 1.4% light stabilizer and 4.4% other materials;

[0051] Step 2: Raw material processing: Put the measured raw materials into a high-speed mixer for mixing and stirring. The stirring temperature is 22-32 degrees Celsius, the stirring speed is 300-500 rpm, and the stirring time is 6 min-22 min.

[0052] Step 3: Extrusion operation: Feed the uniformly mixed raw materials from Step 2 into the extruder, control the internal temperature of the extruder to 178-197 degrees Celsius, melt the raw materials, and then extrude the molten material through the casting die into a low-temperature heat-sealing film.

[0053] Step 4: Cooling corona treatment. The extruded low-temperature heat-sealing film obtained in Step 3 is cooled and then subjected to corona treatment to obtain the finished low-temperature heat-sealing film.

[0054] Step 5: Low-temperature heat-sealing film edge trimming and winding: The low-temperature heat-sealing film cooled in Step 4 is rotated by the preparation device mentioned above, so that the roll 4 can wind the low-temperature heat-sealing film into a roll. The wound low-temperature heat-sealing film is then slit by the low-temperature heat-sealing film slitting equipment to obtain the wound and slit low-temperature heat-sealing film.

[0055] The remaining materials in step one can be antistatic agents, silicone oil, and colorants. Antistatic agents can be used to reduce static electricity on the surface of the low-temperature heat-sealing film and prevent problems during the bonding process. Silicone oil can be used to improve the smoothness and lubricity of the low-temperature heat-sealing film. Colorants can be added as needed to change the color of the low-temperature heat-sealing film.

[0056] By following the above five steps, a low-temperature heat-sealing film with better heat-sealing performance can be obtained, and the service life and stability of the low-temperature heat-sealing film can also be improved.

[0057] In this invention, when the user uses the device, after the low-temperature heat-sealing film is produced through steps one, two, and three, one end of the low-temperature heat-sealing film is passed through one set of moving plates 7 and attached to the surface of the conveying roller 5. Then, it is passed through another set of moving plates 7 and attached to the surface of the roll 4. As the roll 4 rotates, the low-temperature heat-sealing film can be wound up on the surface of the roll 4.

[0058] When the low-temperature heat-sealing film is conveyed between two sets of moving plates 7, the two sets of moving plates 7 are controlled to move towards each other, causing the two cleaning pads 14 to come into close contact with both sides of the low-temperature heat-sealing film. The debris attached to the surface of the low-temperature heat-sealing film can be automatically cleaned and removed by the two sets of cleaning pads 14, avoiding the problem of debris being rolled up inside the low-temperature heat-sealing film and affecting the subsequent use of the low-temperature heat-sealing film.

[0059] Since both sides of one of the movable plates 7 are provided with first cutting blades 8, the distance between the two first cutting blades 8 can be controlled to match the length of the roll 4 within the two corresponding third sliding grooves 17. At this time, the edges of the low-temperature heat-sealing film passing through the gap between one of the movable plates 7 can be automatically cut off by the two first cutting blades 8. This combines the above steps four and five, eliminating the need to re-unroll the low-temperature heat-sealing film after winding and perform edge trimming, thus improving the efficiency of low-temperature heat-sealing film preparation. Moreover, the distance between the two first cutting blades 8 can be adjusted at will, making it convenient to cut the low-temperature heat-sealing film into different widths for winding, thereby improving the applicability of the first cutting blades 8.

[0060] Meanwhile, thickness sensors and laser sensors are respectively installed on the outer wall of the two sets of moving plates 7 near the cleaning pad 14. When the low-temperature heat-sealing film passes between the two sets of moving plates 7, the thickness and flatness of the low-temperature heat-sealing film can be automatically detected, so that the low-temperature heat-sealing film is rolled up after detection. If the low-temperature heat-sealing film fails the detection, the rolling process can be stopped in time, reducing the adverse effects caused by the failure of the low-temperature heat-sealing film.

[0061] Furthermore, before the aforementioned edge trimming and winding process of the low-temperature heat-sealing film, one end of the low-temperature heat-sealing film can be passed through the two sets of moving plates 7. The moving plates 7 can then be controlled to rotate, causing the rubber pads 16 on one side of each moving plate 7 to rotate close to the low-temperature heat-sealing film. Both sets of moving plates 7 are then controlled to move towards the low-temperature heat-sealing film until the rubber pads 16 are in close contact with it. This allows the two sets of moving plates 7 to clamp and fix both ends of the low-temperature heat-sealing film. Controlling the rotation of the double-headed screw 11 causes the two sets of moving plates 7 to move away from each other, thus smoothly winding the low-temperature heat-sealing film. The low-temperature heat-sealing film is stretched to test its strength. The process of stretching the low-temperature heat-sealing film by moving the two sets of moving plates 7 back and forth can be repeated multiple times to further test its strength. After the strength test, one of the first cutting blades 8 can be controlled to rotate towards the moving plate 7. With the help of the third slider 18, the first cutting blade 8 is driven to cut the tested low-temperature heat-sealing film, avoiding the need to rewind the tested section of low-temperature heat-sealing film onto the surface of the roll 4. The entire testing process is highly automated and requires no manual intervention, thus improving the quality of low-temperature heat-sealing film preparation.

[0062] When testing the strength of the low-temperature heat-sealing film, one set of moving plates 7 near the roll 4 can be controlled to clamp and fix one end of the low-temperature heat-sealing film. At this time, the low-temperature heat-sealing film is horizontally taut between the two supports 2. The distance between the other set of moving plates 7 is increased until the sharp parts of the two first cutting blades 8 just abut against the top of the low-temperature heat-sealing film. Then, the first cutting blades 8 are moved back and forth by the two third sliders 18 to rub the surface of the low-temperature heat-sealing film, so that scratches are present on the surface of the low-temperature heat-sealing film. Then, the above steps for testing the strength of the low-temperature heat-sealing film are repeated to detect whether the scratches have a significant impact on the strength of the low-temperature heat-sealing film, thereby further improving the accuracy of the strength test of the low-temperature heat-sealing film.

[0063] As the roll 4 continuously winds the low-temperature heat-sealing film, the diameter of the film roll increases until the outer wall of the roll contacts the top of the abutment plate 10 and is squeezed and pushed. This causes the protrusion at the bottom of the abutment plate 10 to press the contact switch 30, which in turn causes the fourth slider 23 to drive the second cutting blade 21 to cut the low-temperature heat-sealing film. The telescopic ends of the two first electric telescopic rods 25 retract, causing the roll 4 to fall downwards to the top of the abutment plate 10. Since one end of the roll 4 is blocked by one of the moving plates 7, the low-temperature heat-sealing film roll can only temporarily exist between the abutment plate 10 and the arc frame 28. By controlling the arc frame 28 to rotate downwards and controlling the double-headed screw 11 to drive one of the moving plates 7 near the roll 4 to move, the wound low-temperature heat-sealing film roll is pushed downwards from the top of the abutment plate 10 and the arc frame 28 and discharged, achieving the effect of automatic unloading.

[0064] After the second cutting blade 21 cuts the low-temperature heat-sealing film, the end of the rotating plate away from the moving plate 7 can transport external liquid to the inside of the sponge pad 20, so that the end of the low-temperature heat-sealing film near the cutting part is covered with easily volatile liquid, which facilitates the adhesion of the low-temperature heat-sealing film cutting part to the outer wall of the low-temperature heat-sealing film roll, and avoids the low-temperature heat-sealing film cutting part from falling off the surface of the low-temperature heat-sealing film roll during the feeding process, which would affect the subsequent use.

[0065] After use, a large amount of debris cleaned from the surface of the low-temperature heat-sealing film will accumulate on the side of the multiple cleaning pads 14 away from the roll 4. One set of moving plates 7 close to the roll 4 can be driven by the rotation of the second cutting blade 21 to bring the sharp part of the second cutting blade 21 into contact with the outer wall of the two cleaning pads 14. The fourth slider 23 drives the second cutting blade 21 to scrape and clean the debris accumulated on the outer wall of the two cleaning pads 14. The other two cleaning pads 14, because they preferentially contact the debris on the outer wall of the low-temperature heat-sealing film during use, accumulate more debris on one side of their outer wall. The other two moving plates 7 can be controlled to rotate 180 degrees, driving the side of the other two cleaning pads 14 with accumulated debris to a position close to the second cutting blade 21. After the double-headed screw 11 drives the two sets of moving plates 7 to a close position, the second cutting blade 21 is controlled to rotate to contact the other two cleaning pads 14, so that it can scrape and clean the debris accumulated on one side of the other two cleaning pads 14.

[0066] It can also control one of the moving plates 7 to rotate 180 degrees, causing the rotating plate and sponge pad 20 to rotate to a position close to the other two moving plates 7. By using the liquid outlet at the end of the rotating plate away from the moving plate 7, the cleaning agent is sprayed into the interior of the other two cleaning pads 14 to rinse away the debris that cannot be scraped off. It can also control the other two moving plates 7 to move repeatedly towards each other and away from each other, causing the other two cleaning pads 14 to squeeze and reset each other, further improving the cleaning effect on the other two cleaning pads 14. It can also squeeze out the cleaning agent adsorbed inside the cleaning pads 14 at the same time, which is convenient for subsequent use of the device.

[0067] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A device for preparing a low-temperature heat-sealing film, comprising a base (1), characterized in that, The top of the base (1) is equipped with two brackets (2) and two fixing plates (3). The base (1) is equipped with a conveying roller (5). The two fixing plates (3) are provided with a fixing mechanism for fixing the two ends of the roll (4) on the side that is close to each other. The base (1) is provided with a feeding mechanism for automatically discharging the wound heat-sealing film downwards below the fixing mechanism. Two cleaning mechanisms for cleaning the surface of the heat-sealing film are installed between the two brackets (2). The cleaning mechanism includes two sets of parallel moving plates (7). One of the moving plates (7) is provided with a cutting mechanism for cutting the heat-sealing film on both sides of its outer wall. A thickness sensor and a laser sensor are respectively installed on the outer wall of the two sets of moving plates (7) that are close to each other. A cleaning pad (14) is installed on the outer wall of the two sets of moving plates (7) that are close to each other. A through groove (15) for the thickness sensor and the laser sensor is opened in the interior of each of the multiple cleaning pads (14). A rubber pad (16) is installed on the outer wall of the two sets of moving plates (7) that are far apart from each other. The cutting mechanism includes a third slide groove (17) opened on both sides of the outer wall of one of the movable plates (7). A third slider (18) is installed inside each of the two third slide grooves (17). A rotating rod (19) is rotatably installed at the end of each of the two third sliders (18) away from the third slide groove (17). A first cutting blade (8) is threadedly installed at the end of each of the two rotating rods (19) away from the third slider (18) through two bolts. One of the movable plates (7) is rotatably mounted on the side of the roller (4) near the roller, and a sponge pad (20) is mounted on the end of the rotating plate away from the movable plate (7). Another movable plate (7) has a fourth sliding groove (22) on one side outer wall. A fourth slider (23) is installed inside the fourth sliding groove (22). A rotating block (24) is rotatably installed at the end of the fourth slider (23) away from the fourth sliding groove (22). A second cutting blade (21) is rotatably installed on the top of the rotating block (24). The feeding mechanism includes two second electric telescopic rods (9) installed inside the base (1). The telescopic ends of the two second electric telescopic rods (9) are jointly mounted with a mounting plate (27). A contact plate (10) is slidably mounted on the top of the mounting plate (27). Multiple springs (29) are installed between the contact plate (10) and the mounting plate (27). An arc-shaped frame (28) is rotatably mounted on one side of the outer wall of the contact plate (10). A contact switch (30) is mounted at the center of the top of the mounting plate (27). A protrusion for pressing the contact switch (30) is mounted on the bottom of the contact plate (10).

2. The apparatus for preparing a low-temperature heat-sealing film according to claim 1, characterized in that, The fixing mechanism includes a first electric telescopic rod (25) installed on one side of two fixing plates (3) close to each other. The telescopic ends of the two first electric telescopic rods (25) are each equipped with a fixing block (26). The two ends of the drum (4) are respectively fitted onto the outer walls of the two fixing blocks (26).

3. The apparatus for preparing a low-temperature heat-sealing film according to claim 2, characterized in that, The outer walls of the two supports (2) that are close to each other are provided with first grooves (32). The two first grooves (32) are respectively installed with double-ended screws (11) and slide rods. The outer walls of the double-ended screws (11) and slide rods are symmetrically installed with two first sliders (12). The ends of the multiple first sliders (12) that are away from the first grooves (32) are all equipped with moving blocks (6).

4. The apparatus for preparing a low-temperature heat-sealing film according to claim 3, characterized in that, Each of the multiple movable blocks (6) has a second slide groove (31) on the outer wall away from the first slider (12). Each of the multiple second slide grooves (31) has two second sliders (13) installed inside. The two ends of the two sets of movable plates (7) are rotatably connected to the second sliders (13) that are close to them.

5. A method for preparing a low-temperature heat-sealing film, characterized in that, The preparation method includes the preparation apparatus of claim 4, and further includes the following steps: Step 1: Raw material ratio: Select suitable raw materials for preparing low-temperature heat-sealing film, including 68% polypropylene, 14% EVA, 11% modified EPDM rubber powder, 1.2% antioxidant, 1.4% light stabilizer, and 4.4% other materials; Step 2: Raw material processing: Put the measured raw materials into a high-speed mixer for mixing and stirring. The stirring temperature is 22-32 degrees Celsius, the stirring speed is 300-500 rpm, and the stirring time is 6 min-22 min. Step 3: Extrusion operation: Feed the uniformly mixed raw materials from Step 2 into the extruder, control the internal temperature of the extruder to 178-197 degrees Celsius, melt the raw materials, and then extrude the molten material through the casting die into a low-temperature heat-sealing film. Step 4: Cooling corona treatment. The extruded low-temperature heat-sealing film obtained in Step 3 is cooled and then subjected to corona treatment to obtain the finished low-temperature heat-sealing film. Step 5: Low-temperature heat-sealing film edge trimming and winding: The low-temperature heat-sealing film cooled in step 4 is rotated by the preparation device mentioned above, so that the roll (4) can be wound into a roll, and the wound low-temperature heat-sealing film is slit by the low-temperature heat-sealing film slitting equipment to obtain the wound and slit low-temperature heat-sealing film.

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