A cooling device for POF heat shrink film and a manufacturing process for POF heat shrink film.

Abstract

This invention relates to the field of POF heat shrink film production technology, specifically to a cooling device for POF heat shrink film. The device includes a frame with end frames fixedly installed at both ends. An outer roller is rotatably installed at the other end of each end frame. Three partitions are installed inside the frame, and a cooling box for cooling the POF heat shrink film is fixedly installed inside the frame, between the two right-side partitions. The cooling device and the production process for POF heat shrink film involve two cooling devices, both using air cooling to cool the POF heat shrink film. The POF heat shrink film passes through cooling water, switching from air cooling to water cooling. A dewatering roller then wipes away water stains from the POF heat shrink film. Finally, a third cooling device blows cold air a final time, further drying the POF heat shrink film. This medium-contact cooling method significantly improves the cooling speed.

Description

Technical Field

[0001] This invention relates to the field of POF heat shrink film production technology, specifically to a cooling device for POF heat shrink film and a production process for POF heat shrink film. Background Technology

[0002] POF stands for multilayer co-extruded polyolefin heat shrink film. It is made by using linear low-density polyethylene as the middle layer and copolypropylene as the inner and outer layers. It is plasticized and extruded by five extruders, and then processed by special processes such as die forming and film bubble inflation. At present, POF heat shrink film on the market uses a rapid cooling device in the production process. However, traditional rapid cooling devices can only cool the POF heat shrink film on one side, resulting in poor cooling effect.

[0003] Chinese patent CN210679362U discloses a combined rapid cooling device for POF heat shrink film. This patent involves an inflow pipe through which coolant flows into cooling holes. The POF heat shrink film is moved through the placement holes and connected to an external winding device. Activating the external winding device causes the POF heat shrink film to move. During this movement, the POF heat shrink film contacts the first and second heat-absorbing plates. Because the first and second heat-absorbing plates are made of copper, which has strong heat absorption and conductivity, the POF heat shrink film is effectively cooled. The heat from both sides is absorbed into itself, and the coolant inside the cooling hole then absorbs the heat from the first and second heat-absorbing plates before flowing out through the outlet pipe, thus achieving a double-sided cooling effect and achieving good cooling performance. At the same time, by setting up a U-shaped block, the U-shaped block is connected to a rotating rod by a bearing, and the rotating rod is connected to a roller by a sleeve. Since the first and second limiting blocks are inserted, the roller rotates in the bearing by the rotating rod after being subjected to force. When the external winding device is working, the roller can play a traction role to prevent the POF heat shrink film from getting stuck, further improving the practicality of the cooling device.

[0004] However, in actual operation, the aforementioned patent does not directly dissipate the heat on the POF heat shrink film, but instead uses heat conduction to absorb the heat on the POF heat shrink film. Its cooling rate is indeed relatively slow. At the same time, in this patented technology, the temperature of the coolant in the cooling holes is uniform, and the cooling process cannot be gradual. When the POF heat shrink film suddenly encounters a low-temperature medium, its surface is prone to wrinkles, which leads to a decrease in the quality of the POF heat shrink film. Therefore, this application proposes a cooling device for POF heat shrink film and a production process for POF heat shrink film to solve these problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a cooling device for POF heat shrink film and a production process for POF heat shrink film. It has advantages such as good cooling effect, segmented cooling, and stable quality of POF heat shrink film. It solves the problems of slow heat conduction cooling speed and easy wrinkling of POF heat shrink film after sudden exposure to low temperature medium, which leads to quality degradation.

[0006] To achieve the above-mentioned goals of good cooling effect, segmented cooling, and stable quality of POF heat shrink film, the present invention provides the following technical solution: a cooling device for POF heat shrink film, including a frame, end frames fixedly installed at both ends of the frame, an outer roller rotatably installed at the other end of the end frame, three partitions installed inside the frame, a cooling box for cooling POF heat shrink film fixedly installed inside the frame and between the two right-side partitions, and a first cooling device, a second cooling device, and a third cooling device for performing stepped cooling of POF heat shrink film respectively installed on the left side of each of the three partitions, and a dewatering device for removing water stains from the surface of POF heat shrink film is provided between the cooling box and the third cooling device;

[0007] The first cooling device, the second cooling device, and the third cooling device have the same structure. The air source used by the first cooling device, the second cooling device, and the third cooling device has a temperature of 25°C, 10°C, and 7°C, respectively. The POF heat shrink film is cooled in stages through four levels: the first cooling device, the second cooling device, the cooling box, and the third cooling device.

[0008] The first cooling device includes two cooling frames fixedly mounted on a partition. Several shafts extending into the inside of the cooling frames are rotatably mounted on both sides of the cooling frames. A diversion pipe is fixedly mounted on one side of the two shafts opposite each other. The number of diversion pipes is half the number of shafts. The diversion pipe is a rectangular square tube with chamfered edges. Several nozzles are fixedly mounted evenly at equal intervals on the surface of the diversion pipe.

[0009] A flexible hose is fixedly installed on the side of the diverter pipe away from the nozzle, and an air supply pipe is fixedly installed on the other end of the flexible hose. The air supply pipe is fixedly installed on the partition by a mounting bracket. The surface of the air supply pipe is connected to an external air pump through a delivery pipe. The two cooling frames are distributed on the upper and lower sides of the POF heat shrink film, and the distance between the cooling frames and the POF heat shrink film is between 3 and 6 cm.

[0010] Furthermore, an adjusting dial is fixedly installed on each of the two opposing sides of the shafts. A triangular pointer is fixedly installed on the surface of the adjusting dial. An angle dial adapted to the adjusting dial is fixedly installed on the outer side of the cooling frame and around the shafts. An anti-slip sleeve is fixedly installed on the surface of the shafts and between the inner wall of the cooling frame and the distribution pipe. A fixing device is provided on the inner wall of one side of the cooling frame and on the surface of the anti-slip sleeve.

[0011] Furthermore, the adjusting dial is cylindrical, the angle dial is annular, the angle dial is engraved with angle scales, the anti-slip sleeve is a rubber sleeve, the anti-slip sleeve is cylindrical, and the surface of the anti-slip sleeve is provided with anti-slip threads.

[0012] Furthermore, the fixing device includes a fixed frame fixedly installed on the inner wall of the cooling frame, a movable frame rotatably mounted on the surface of the fixed frame via a shaft, the fixed frame and the movable frame being located outside the anti-slip sleeve, an arc-shaped groove being formed on the opposite side of the fixed frame and the movable frame, and an anti-slip texture being formed on the inner wall of the arc-shaped groove, a fastening rod being rotatably mounted on the side of the movable frame away from the shaft, a limiting ring being fixedly mounted on the surface of the fastening rod and located inside the movable frame, and a limiting block being rotatably connected to the movable frame being fixedly mounted on the bottom end of the fastening rod, and a limiting block being threadedly connected to the fixed frame being fixedly mounted on the bottom of the fixed frame, a fastening groove adapted to the limiting block being formed on the bottom of the fixed frame, and a torsion block being fixedly mounted on the top end of the fastening rod.

[0013] Furthermore, channels for the POF heat shrink film to pass through are provided in the middle of the partition and on both sides of the cooling box. Inner frames are fixedly installed on the inner top and bottom walls of the channels. Tensioning rollers are rotatably installed inside the inner frames. The surface of the tensioning rollers is finely polished. Inner frame rollers are fixedly installed on the inner walls of both sides of the cooling box and below the channels. A ceiling frame is fixedly installed on the inner top wall of the cooling box. A pressure roller for pressing down the POF heat shrink film is rotatably installed at the bottom of the ceiling frame. Cooling water is filled inside the cooling box and below the inner frame rollers.

[0014] Furthermore, the dewatering device includes two dewatering frames fixedly installed inside the frame and located between the cooling box and the third cooling device. Two dewatering rollers that sandwich the POF heat shrink film are rotatably installed on the inner side of the dewatering frames. Each dewatering roller includes a rigid inner roller, a sponge roller is fixedly installed on the surface of the rigid inner roller, and a woolen sleeve is fixedly installed on the surface of the sponge roller. A drive motor is fixedly installed on the front side of the dewatering frame, and the output end of the drive motor extends to the inner side of the dewatering frame and is fixedly connected to the rigid inner roller. The distance between the two dewatering frames is two-thirds of the diameter of the dewatering roller.

[0015] Another technical problem to be solved by the present invention is to provide a production process for POF heat shrink film, including the following steps:

[0016] 1) The POF heat shrink film passes through the frame from left to right via the traction device, allowing the POF heat shrink film to pass through the first cooling device and the second cooling device in sequence;

[0017] 2) When the POF heat shrink film enters the cooling box, the inner frame roller on the left turns the POF heat shrink film downward until the POF heat shrink film is immersed in the cooling water. Then, the pressure roller keeps the POF heat shrink film in the cooling water for a period of time. Finally, the inner frame roller on the right outputs the POF heat shrink film from the cooling box.

[0018] 3) After passing through the cooling box, the POF heat shrink film passes between four dewatering rollers. The water stains on the POF heat shrink film are wiped off by the woolen sleeve. Then, the third cooling device performs the final cooling and blows the water stains on the surface of the POF heat shrink film dry.

[0019] 4) When passing through the partition, the POF heat shrink film is clamped by two tensioning rollers to ensure that the POF heat shrink film remains taut throughout the transportation process and avoids wrinkles.

[0020] 5) After the four-stage cooling process is completed, the product is output from the outer roller on the right and then continues to the subsequent processes.

[0021] Compared with the prior art, the present invention provides a cooling device for POF heat shrink film and a production process for POF heat shrink film, which has the following beneficial effects:

[0022] 1. The cooling device and production process of the POF heat shrink film: The first and second cooling devices both use air cooling to cool the POF heat shrink film. Then, the POF heat shrink film passes through cooling water, switching from air cooling to water cooling mode. Subsequently, the water stains on the POF heat shrink film are wiped off by a dewatering roller. Finally, it passes through the third cooling device for a final cold air blowing, which not only cools the POF heat shrink film again but also dries the water vapor on the POF heat shrink film. Compared with indirect cooling using heat conduction, the direct contact cooling method in this application significantly improves the cooling speed. In addition, the POF heat shrink film is cooled in four stages through the first cooling device, the second cooling device, the cooling box, and the third cooling device, which effectively controls the thermal behavior of the polyolefin material during the cooling process, thereby reducing the wrinkling phenomenon on the surface of the POF heat shrink film and making the transverse and longitudinal tensile properties of the POF film reach more ideal values, thus greatly improving the output quality of the POF heat shrink film.

[0023] 2. The cooling device for the POF heat shrink film and the production process of the POF heat shrink film allow for precise control of the adjustment degree by observing the triangular pointer and the angle dial. This adapts to the cooling requirements of POF heat shrink films of different thicknesses, thus enhancing the practicality of this application. Attached Figure Description

[0024] Figure 1 This is a front sectional view of the present invention;

[0025] Figure 2 This is a partial side sectional view of the first cooling device of the present invention;

[0026] Figure 3 This is a diagram of the shunt pipe for the present invention;

[0027] Figure 4 This is a cross-sectional view of the fixing device of the present invention;

[0028] Figure 5 This is a diagram of the fixing device of the present invention;

[0029] Figure 6 This is a front view of the first cooling device of the present invention;

[0030] Figure 7 For the present invention Figure 1 Enlarged view of A in the middle;

[0031] Figure 8 This is a front view of the present invention.

[0032] In the diagram: 1. Frame, 2. End frame, 3. Outer roller, 4. Partition plate, 41. Channel, 42. Inner frame, 43. Tensioning roller, 5. Cooling box, 51. Inner frame roller, 52. Ceiling frame, 53. Lower pressure roller, 6. First cooling device, 61. Cooling frame, 62. Diverter pipe, 63. Nozzle, 64. Shaft, 65. Adjusting torque disc, 66. Angle dial, 67. Anti-slip sleeve, 68. Fixing device, 681. Fixing frame, 682. Movable frame, 683. Fastening rod, 684. Limiting ring, 685. Limiting block, 7. Second cooling device, 8. Third cooling device, 9. Water removal frame, 10. Water removal roller, 11. Water removal device. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0034] Please see Figure 1 or Figure 8 , a cooling device for a POF heat shrinkable film, comprising a frame 1, end frames 2 are fixedly installed at both ends of the frame 1, and outer rollers 3 are rotatably installed at the other ends of the end frames 2, and the outer rollers are used to ensure that the position of the POF heat shrinkable film when entering and exiting the frame 1 will not deviate.

[0035] Three partitions 4 are installed inside the frame 1, and a cooling box 5 for cooling the POF heat shrinkable film is fixedly installed between the two partitions 4 on the right side inside the frame 1 to achieve the purpose of water cooling. And first cooling devices 6, second cooling devices 7 and third cooling devices 8 for performing stepped cooling on the POF heat shrinkable film are respectively installed on the left sides of the three partitions 4.

[0036] Among them, the first cooling device 6, the second cooling device 7 and the third cooling device 8 have the same structure, but the temperatures of the air sources used by the first cooling device 6, the second cooling device 7 and the third cooling device 8 are 25°C, 10°C and 7°C respectively, and the POF heat shrinkable film passes through the first cooling device 6, the second cooling device 7, the cooling box 5 and the third cooling device 8 in four levels for segmented temperature reduction, so as to achieve gradual stepped temperature reduction.

[0037] Please refer to Figure 1-2 , the first cooling device 6 includes two cooling frames 61 fixedly installed on the partition 4, the two cooling frames 61 are distributed on the upper and lower sides of the POF heat shrinkable film, the distance between the cooling frame 61 and the POF heat shrinkable film is between 3 - 6 cm, the top view shape of the cooling frame 61 is a "匚" shape, and a number of shaft rods 64 extending to the inside of the cooling frame 61 are rotatably installed on both sides of the cooling frame 61.

[0038] Among them, the shaft rods 64 on both sides of the cooling frame 61 correspond to each other, and the corresponding two shaft rods 64 are a group. A flow dividing pipe 62 is fixedly installed on the opposite side of each group of shaft rods 64. The number of flow dividing pipes 62 is half of the number of shaft rods 64. A number of nozzles 63 are evenly fixedly installed on the surface of the flow dividing pipe 62 at equal intervals. After the cold water is blown out through the nozzles 63, the heat on the POF heat shrinkable film can be taken away.

[0039] The flow dividing pipe 62 is a rectangular square pipe, and for safety reasons, the edges of the flow dividing pipe 62 are all chamfered. In addition, a hose is fixedly installed on the side of the flow dividing pipe 62 away from the nozzle 63, the other end of the hose is fixedly installed with an air supply pipe, the air supply pipe is fixedly installed on the partition 4 through a mounting frame, and the surface of the air supply pipe is connected to an external air pump through a delivery pipe, and the cold air is pressurized by the air pump and filled into the pipe.

[0040] Please refer to Figure 3A cylindrical adjusting disc 65 is fixedly installed at the end of the shaft 64 away from the splitter pipe 62, and a triangular pointer is fixedly installed on the surface of the adjusting disc 65. An annular angle dial 66 adapted to the adjusting disc 65 is fixedly installed on the outside of the cooling frame 61 and around the shaft 64.

[0041] The angle dial 66 is marked with angle scales. Therefore, when it is necessary to adjust the angle between the nozzle 63 and the POF heat shrink film, the adjustment dial 65 is turned and the tilt angle of the nozzle 63 can be accurately controlled by observing the triangular pointer and the angle dial 66.

[0042] A cylindrical anti-slip sleeve 67 is fixedly installed on the surface of the shaft 64 and between the inner wall of the cooling frame 61 and the distribution pipe 62. The anti-slip sleeve 67 is a rubber sleeve, and anti-slip threads are provided on the surface of the anti-slip sleeve 67.

[0043] Please see Figure 2 A fixing device 68 is provided on the inner wall of one side of the cooling frame 61 and on the surface of the anti-slip sleeve 67 to fix the diversion pipe 62 after adjusting the angle of the nozzle 63 and prevent the diversion pipe 62 from rotating.

[0044] Please see Figure 2 The fixing device 68 includes a fixed frame 681 fixedly installed on the inner wall of the cooling frame 61, and a movable frame 682 rotatably mounted on the surface of the fixed frame 681 via a shaft. The fixed frame 681 and the movable frame 682 are located on the outside of the anti-slip sleeve 67.

[0045] Please see Figure 4-6 An arc-shaped groove is provided on the opposite side of the fixed frame 681 and the movable frame 682 to wrap the anti-slip sleeve 67. At the same time, in order to improve the friction, anti-slip texture is provided on the inner wall of the arc-shaped groove. A fastening rod 683 is rotatably installed on the side of the movable frame 682 away from the shaft. A limiting ring 684 that is rotatably connected to the movable frame 682 is fixedly installed on the surface of the fastening rod 683 and inside the movable frame 682. At the same time, a limiting block 685 that is threadedly connected to the fixed frame 681 is fixedly installed at the bottom end of the fastening rod 683.

[0046] The fixed frame 681 has a fastening groove at the bottom that is adapted to the limiting block 685. The height of the fastening groove is greater than the thickness of the limiting block 685, so that the limiting block 685 can move to a certain extent, thereby loosening or tightening the fixed frame 681 and the movable frame 682. The top of the fastening rod 683 is fixedly installed with a torsion block, which makes it convenient for workers to tighten the fastening rod 683.

[0047] Please see Figure 1 or Figure 7Channels 41 for passing through the POF heat shrink film are provided in the middle of the partition 4 and on both sides of the cooling box 5. An inner frame 42 is fixedly installed on the inner top wall and inner bottom wall of the channel 41. A tension roller 43 is rotatably installed inside the inner frame 42. In order to prevent the tension roller 43 from scratching the heat shrink film, the surface of the tension roller 43 is finely polished.

[0048] Please see Figure 1 Inner frame rollers 51 are fixedly installed on the inner walls of both sides of the cooling box 5 and below the channel 41. A ceiling frame 52 is fixedly installed on the inner top wall of the cooling box 5. A pressure roller 53 for pressing down the POF heat shrink film is rotatably installed at the bottom of the ceiling frame 52. Cooling water is filled inside the cooling box 5 and below the inner frame rollers 51 for water cooling of the heat shrink film.

[0049] A dewatering device 11 for removing water stains from the surface of the POF heat shrink film is provided between the cooling box 5 and the third cooling device 8.

[0050] Please see Figure 1 or Figure 8 The dewatering device 11 includes two dewatering racks 9 fixedly installed inside the frame 1 and located between the cooling box 5 and the third cooling device 8. Two dewatering rollers 10 are rotatably installed on the inner side of the dewatering racks 9 to sandwich the POF heat shrink film in the middle.

[0051] The dewatering roller 10 includes a rigid inner roller, a sponge roller is fixedly installed on the surface of the rigid inner roller, and a woolen sleeve is fixedly installed on the surface of the sponge roller. The woolen sleeve is used to wipe away water stains on the heat shrink film. A drive motor is fixedly installed on the front of the dewatering frame 9. The output end of the drive motor extends to the inside of the dewatering frame 9 and is fixedly connected to the rigid inner roller, so that the drive motor drives the dewatering roller 10 to rotate. The distance between the two dewatering frames 9 is two-thirds of the diameter of the dewatering roller 10.

[0052] A manufacturing process for POF heat shrink film is provided, including the following steps:

[0053] 1) The POF heat shrink film passes through the frame 1 from left to right via the traction device, allowing the POF heat shrink film to pass through the first cooling device 6 and the second cooling device 7 in sequence;

[0054] 2) When the POF heat shrink film enters the cooling box 5, the inner frame roller 51 on the left turns the POF heat shrink film downward until the POF heat shrink film is immersed in the cooling water. Then, the pressure roller 53 keeps the POF heat shrink film in the cooling water for a period of time. Then, the inner frame roller 51 on the right outputs the POF heat shrink film from the cooling box 5.

[0055] 3) After passing through the cooling box 5, the POF heat shrink film passes between the four dewatering rollers 10. The water stains on the POF heat shrink film are wiped off by the woolen sleeve. Then, the third cooling device 8 performs the final cooling and blows the water stains on the surface of the POF heat shrink film dry.

[0056] 4) When passing through the partition 4, the POF heat shrink film is clamped by two tensioning rollers 43 to ensure that the POF heat shrink film remains taut during the transportation process and avoids wrinkles.

[0057] 5) After the four-stage cooling process is completed, the product is output from the outer roller 3 on the right and then continues the subsequent process.

[0058] The beneficial effects of the above embodiments are as follows: the POF heat shrink film is cooled by air cooling through the first cooling device 6 and the second cooling device 7. Then, the POF heat shrink film passes through cooling water, switching from air cooling to water cooling mode. Subsequently, the water stains on the POF heat shrink film are wiped off by the dewatering roller 10. Finally, the third cooling device 68 blows cold air for the last time, which not only cools the POF heat shrink film again but also dries the water vapor on the POF heat shrink film. Compared with indirect cooling using heat conduction, the direct contact cooling in this application significantly improves the cooling speed. In addition, the POF heat shrink film passes through four levels of segmented cooling, which effectively controls the thermal behavior of the polyolefin material during the cooling process, thereby reducing the phenomenon of wrinkling on the surface of the POF heat shrink film and making the transverse and longitudinal tensile properties of the POF film reach more ideal values, thus greatly improving the output quality of the POF heat shrink film.

[0059] In addition, when it is necessary to adjust the angle between the nozzle 63 and the POF heat shrink film, first tighten the fastening rod 683 to loosen the fixed frame 681 and the movable frame 682, and then rotate the adjusting dial 65 to make the diverter rotate synchronously. The operator only needs to observe the triangular pointer and the angle dial 66 to accurately control the degree of adjustment, which can adapt to the cooling requirements of POF heat shrink film of different thicknesses, thus making the application more practical.

[0060] All electrical components mentioned in the text are electrically connected to the main controller and power supply. The main controller can be a conventional and known device such as a computer, and the existing publicly available power connection technology will not be elaborated in the text.

[0061] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0062] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cooling device for POF heat shrink film, comprising a frame (1), wherein end frames (2) are fixedly installed at both ends of the frame (1), and an outer roller (3) is rotatably installed at the other end of the end frame (2), and three partitions (4) are installed inside the frame (1), characterized in that: A cooling box (5) for cooling POF heat shrink film is fixedly installed inside the frame (1) and between the two partitions (4) on the right side. A first cooling device (6), a second cooling device (7) and a third cooling device (8) for cascading cooling of POF heat shrink film are respectively installed on the left side of the three partitions (4). A dewatering device (11) for removing water stains from the surface of POF heat shrink film is provided between the cooling box (5) and the third cooling device (8). The first cooling device (6), the second cooling device (7) and the third cooling device (8) have the same structure. The air source used by the first cooling device (6), the second cooling device (7) and the third cooling device (8) has a temperature of 25°C, 10°C and 7°C respectively. The POF heat shrink film is cooled in stages by passing through the first cooling device (6), the second cooling device (7), the cooling box (5) and the third cooling device (8). The first cooling device (6) includes two cooling frames (61) fixedly mounted on the partition (4). Several shafts (64) extending into the inside of the cooling frame (61) are rotatably mounted on both sides of the cooling frame (61). A diversion pipe (62) is fixedly mounted on the opposite side of the two shafts (64). The number of diversion pipes (62) is half the number of shafts (64). The diversion pipe (62) is a rectangular square tube. The edges of the diversion pipe (62) are chamfered. Several nozzles (63) are fixedly mounted evenly at equal intervals on the surface of the diversion pipe (62). A hose is fixedly installed on the side of the diverter pipe (62) away from the nozzle (63), and an air supply pipe is fixedly installed on the other end of the hose. The air supply pipe is fixedly installed on the partition (4) by the mounting bracket. The surface of the air supply pipe is connected to an external air pump through the delivery pipe. The two cooling frames (61) are distributed on the upper and lower sides of the POF heat shrink film. The distance between the cooling frame (61) and the POF heat shrink film is between 3 and 6 cm.

2. The cooling device for POF heat shrink film according to claim 1, characterized in that: An adjusting disc (65) is fixedly installed on each of the two shafts (64) on opposite sides. A triangular pointer is fixedly installed on the surface of the adjusting disc (65). An angle dial (66) adapted to the adjusting disc (65) is fixedly installed on the outer side of the cooling frame (61) and around the shaft (64). An anti-slip sleeve (67) is fixedly installed on the surface of the shaft (64) and between the inner wall of the cooling frame (61) and the diversion pipe (62). A fixing device (68) is provided on the inner wall of one side of the cooling frame (61) and on the surface of the anti-slip sleeve (67).

3. A cooling device for POF heat shrink film according to claim 2, characterized in that: The adjusting dial (65) is cylindrical, the angle dial (66) is annular, the angle dial (66) is engraved with angle scales, the anti-slip sleeve (67) is a rubber sleeve, the anti-slip sleeve (67) is cylindrical, and the surface of the anti-slip sleeve (67) is provided with anti-slip threads.

4. A cooling device for POF heat shrink film according to claim 2, characterized in that: The fixing device (68) includes a fixed frame (681) fixedly installed on the inner wall of the cooling frame (61). A movable frame (682) is rotatably mounted on the surface of the fixed frame (681) via a shaft. The fixed frame (681) and the movable frame (682) are located outside the anti-slip sleeve (67). An arc-shaped groove is provided on the opposite side of the fixed frame (681) and the movable frame (682). Anti-slip texture is provided on the inner wall of the arc-shaped groove. The movable frame (682) rotates on the side away from the shaft. A fastening rod (683) is installed, and a limiting ring (684) that is rotatably connected to the movable frame (682) is fixedly installed on the surface of the fastening rod (683) and inside the movable frame (682). A limiting block (685) that is threadedly connected to the fixed frame (681) is fixedly installed at the bottom of the fastening rod (683). A fastening groove that is adapted to the limiting block (685) is opened at the bottom of the fixed frame (681). A torsion block is fixedly installed at the top of the fastening rod (683).

5. A cooling device for POF heat shrink film according to claim 1, characterized in that: The partition (4) has a channel (41) in the middle and on both sides of the cooling box (5) for the POF heat shrink film to pass through. The inner top wall and inner bottom wall of the channel (41) are fixedly installed with an inner frame (42). The tension roller (43) is rotatably installed inside the inner frame (42). The surface of the tension roller (43) is finely polished. The inner walls on both sides of the cooling box (5) and below the channel (41) are fixedly installed with inner frame rollers (51). The inner top wall of the cooling box (5) is fixedly installed with a ceiling frame (52). The bottom of the ceiling frame (52) is rotatably installed with a pressure roller (53) for pressing down the POF heat shrink film. The interior of the cooling box (5) and below the inner frame roller (51) is filled with cooling water.

6. A cooling device for POF heat shrink film according to claim 1, characterized in that: The dewatering device (11) includes two dewatering racks (9) fixedly installed inside the frame (1) and located between the cooling box (5) and the third cooling device (8). Two dewatering rollers (10) that sandwich POF heat shrink film are rotatably installed on the inner side of the dewatering racks (9). Each dewatering roller (10) includes a rigid inner roller, a sponge roller is fixedly installed on the surface of the rigid inner roller, and a woolen sleeve is fixedly installed on the surface of the sponge roller. A drive motor is fixedly installed on the front side of the dewatering racks (9), and the output end of the drive motor extends to the inner side of the dewatering racks (9) and is fixedly connected to the rigid inner roller. The distance between the two dewatering racks (9) is two-thirds of the diameter of the dewatering rollers (10).

7. A production process for POF heat shrink film, characterized in that, Includes the following steps: 1) The POF heat shrink film passes through the frame (1) from left to right via the traction device, allowing the POF heat shrink film to pass through the first cooling device (6) and the second cooling device (7) in sequence. 2) When the POF heat shrink film enters the cooling box (5), the inner frame roller (51) on the left turns the POF heat shrink film downward until the POF heat shrink film is immersed in the cooling water. Then, the lower pressure roller (53) keeps the POF heat shrink film in the cooling water for a period of time. Then, the inner frame roller (51) on the right outputs the POF heat shrink film out of the cooling box (5). 3) After the POF heat shrink film passes through the cooling box (5), it passes between the four dewatering rollers (10) one after another. The water stains on the POF heat shrink film are wiped off by the woolen sleeve. Then, the third cooling device (8) performs the final cooling and blows the water stains on the surface of the POF heat shrink film dry. 4) When passing through the partition (4), the POF heat shrink film is clamped by two tensioning rollers (43) to ensure that the POF heat shrink film remains taut during the transportation process and avoids wrinkles. 5) After the four-stage cooling is completed, the product is output from the outer roller (3) on the right end and then the subsequent process continues.

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