Thermal shrinkage film preparation device and preparation process thereof

Abstract

The invention discloses a thermal shrinkage film preparation device and a preparation process thereof, relates to the technical field of high polymer materials, and solves the problems that a thermal shrinkage film is uneven in thickness, unstable in shrinkage rate and not pre-stretched. The thermal shrinkage film preparation device and the preparation process comprise a fixed base and a thermal shrinkage film rolling film, and a melt co-extrusion structure is installed at one end of the fixed base; the melt co-extrusion structure is used for preparing a heat shrinkage film roll film, the transfer structure is mounted at one end of the melt co-extrusion structure, the template pre-pressing structure is mounted at one end, far away from the melt co-extrusion structure, of the transfer structure, the heat shrinkage film hot-pressing structure is mounted at one end, far away from the transfer structure, of the template pre-pressing structure, and the heat shrinkage film roll film is pre-stretched by the heat shrinkage film hot-pressing structure; according to the preparation method, pre-stretching is carried out in the preparation process of the thermal shrinkage film, the phenomenon that the thermal shrinkage film forms a high-orientation fibrous structure and net-shaped micropores due to the fact that the longitudinal stretching strength and the transverse stretching strength of the thermal shrinkage film are not uniform is avoided, and the mechanical property of the thermal shrinkage film is reduced through pre-stretching of the structure.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and specifically relates to a thermal shrink film preparation device and its preparation process. Background Art

[0002] A thermal shrink film is a plastic packaging material that shrinks when heated, thus tightly wrapping around the product. And this device is aimed at optimizing and improving the equipment on the thermal shrink film processing and product preparation production line.

[0003] The existing Chinese patent with the publication number CN113353381A discloses a thermal shrink film corner cutting device, including an auxiliary mechanism, a clamping mechanism, a chamfering mechanism and a cutting knife mechanism. The auxiliary mechanism includes an auxiliary part, and the auxiliary part includes a bottom knife surface. The clamping mechanism includes clamping plates, and the two clamping plates are used to clamp the opposite sides of the product box to position one side wall of the product box parallel to the bottom knife surface and close to one edge of the bottom knife surface. The chamfering mechanism includes a chamfering plate, and after the chamfering plate moves, it can smooth the thermal shrink film extending out of the product box surface on one side of the side wall close to the bottom knife surface and make the thermal shrink film fit the bottom knife surface. The cutting knife mechanism includes a cutting knife, and the cutting knife is used to punch towards the bottom knife surface to thermally cut the thermal shrink film. A thermal shrink film device includes the above-mentioned thermal shrink film corner cutting device. The above-mentioned thermal shrink film corner cutting device and thermal shrink film device achieve the purpose of improving the corner cutting effect and efficiency. However, this thermal shrink film corner cutting device still has the following defects 1. There are problems such as unstable shrinkage rate, poor high-temperature resistance and uneven thickness caused by improper control of the stretching temperature. In addition, there are also problems with uneven cutting edges and adhesion of the thermal shrink film edges. 2. In the traditional preparation process, the mechanical properties of the pre-stretched film material of the thermal shrink film decline. The thermal shrink film is not pre-stretched during the preparation process, and when the operator stretches it during actual use, it will cause uneven longitudinal and transverse stretching forces of the thermal shrink film, resulting in the formation of a highly oriented fibrous structure and a reticular microporous phenomenon. Summary of the Invention

[0004] The purpose of the present invention is to provide a thermal shrink film preparation device and its preparation process to solve the problems raised in the above background art.

[0005] The technical solution of the present invention is: a thermal shrink film preparation device and preparation process, including a fixed base and a thermal shrink film roll. One end of the fixed base is installed with a melt co-extrusion structure, and the melt co-extrusion structure prepares the thermal shrink film roll. One end of the melt co-extrusion structure is installed with a transfer structure, and one end of the transfer structure away from the melt co-extrusion structure is installed with a template pre-pressing structure. One end of the template pre-pressing structure away from the transfer structure is installed with a thermal shrink film hot-pressing structure, and the thermal shrink film hot-pressing structure pre-stretches the thermal shrink film roll; Among them, the melt co-extrusion structure includes a first motor, a flow divider, and a temperature-controlled hot pressing module. The first motor is installed at the top of the fixed base, and a flow divider is provided on one side of the first motor. A temperature-controlled hot pressing module is provided on one side of the flow divider. Among them, the heat shrink film hot pressing structure includes a fourth motor, a heat shrink film hot pressing die, and a heat shrink film processing die. The fourth motor is installed at the top of the fixed base, and the output end of the fourth motor is connected to the heat shrink film hot pressing die through transmission. A heat shrink film processing die is provided at the bottom of the heat shrink film hot pressing die.

[0006] Furthermore, the melt co-extrusion structure further includes a hollow frame, and the hollow frame is installed at the top of the fixed base. A first motor is installed on one side of the hollow frame, and a heat shrink film raw material is installed at the output end of the first motor. Among them, conduction wheels are installed at the four peripheral edges of the flow divider. A merging base is installed on the side of the flow divider away from the hollow frame. The surface of the heat shrink film raw material contacts the conduction wheels, and the heat shrink film raw material passes through the middle of the merging base after passing through the conduction wheels.

[0007] Furthermore, the melt co-extrusion structure further includes a hollow frame, and the hollow frame is installed at the top of the fixed base. A first motor is installed on one side of the hollow frame, and a heat shrink film raw material is installed at the output end of the first motor. Among them, conduction wheels are installed at the four peripheral edges of the flow divider. A merging base is installed on the side of the flow divider away from the hollow frame. The surface of the heat shrink film raw material contacts the conduction wheels, and the heat shrink film raw material passes through the middle of the merging base after passing through the conduction wheels.

[0008] Furthermore, a convex roller is installed at the top inside the temperature-controlled hot pressing module, and a concave roller is installed at the bottom inside the temperature-controlled hot pressing module. A total of six groups of convex rollers and concave rollers are provided. Among them, the interior of the temperature-controlled hot pressing module is divided into three regions, and two groups of convex rollers and concave rollers are in one region. Among them, the outer shapes of the convex roller and the concave roller are matched and engaged with each other.

[0009] Furthermore, the transfer structure includes a first support plate, and the bottom end of the first support plate is fixedly connected to the fixed base. A second motor is installed on one side of the first support plate, and a driving roller is installed at the output end of the second motor. A heat shrink film roll is in contact connection with the surface of the driving roller.

[0010] Further, the template pre-pressing structure includes a second support plate, and the bottom end of the second support plate is fixedly connected to the fixed base. At the top end of one side of the second support plate, two sets of branch rollers are installed. On one side of the second support plate, a pressure device is installed, and a buffer module is provided at the bottom end of the pressure device. The buffer module is divided into two groups, upper and lower, and an elastic element is installed at the connection of the two buffer modules. Among them, a third electric sliding table is installed on one side of the second support plate close to the buffer module.

[0011] Further, at one end of one side of the second support plate, a second electric sliding table is installed, and a pre-pressing roller is installed at the output end of the second electric sliding table.

[0012] Further, a U-shaped positioning module is installed on the side of the buffer module away from the pre-pressing roller, and a deburring scraper is installed on one side of the U-shaped positioning module. The heat shrinkable film roll passes through the connection of the contact surfaces of the U-shaped positioning module and the deburring scraper.

[0013] Further, on one side of the top end of the fixed base, a first support back plate is fixedly installed. On one side of the first support back plate, a third motor is installed, and a first transmission gear is installed at the output end of the third motor. On the side of the first support back plate away from the first transmission gear, a second transmission gear is installed. Among them, the first transmission belt is in surface contact connection with the first transmission gear and the second transmission gear, and a first transmission base is installed at the bottom end of the first transmission belt. One end of the first transmission base is installed with a second support back plate.

[0014] Further, a fourth motor is installed at one end of the second support back plate, and a third transmission gear is installed at the output end of the fourth motor. There are two sets of the third transmission gears, upper and lower, and the second set of the third transmission gears is installed at the bottom end of the second support back plate. Among them, the two sets of third transmission gears are in surface contact connection with the second transmission belt, and a second moving base is installed on one side of the second transmission belt. A limiting rail is installed on the side of the second support back plate close to the second moving base. Among them, a heat shrinkable film hot pressing die is installed at the bottom end of the limiting rail. A first electric sliding table is installed on one side of the second support back plate, and a positioning clamp is installed on the side of the first electric sliding table close to the heat shrinkable film hot pressing die. Among them, a fifth motor is installed on the side of the fixed base close to the transfer structure, and a transmission tooth is installed at the output end of the fifth motor. An internal tooth groove is installed at the top end of the transmission tooth, and the internal tooth groove and the heat shrinkable film processing die are in meshing transmission, and one side of the internal tooth groove is fixedly connected to the heat shrinkable film processing die.

[0015] A heat shrinkable film preparation process includes the following steps: S1. First, the heat-shrinkable film raw material is shunted by multiple groups of conduction wheels, and then heated, fused, and extruded through the parallel-strand base to be combined into a single heat-shrinkable strip raw material. Then, the heat-shrinkable film raw material is repeatedly extruded through multiple groups of convex rollers and concave rollers. There are six groups of convex rollers and concave rollers respectively in the temperature-controlled hot-pressing module, which are divided into three areas. Two groups of convex rollers and concave rollers form one area. The segmented temperature control method is adopted. The raw material extruded from the parallel-strand base reaches the first area, then the second area, and finally the third area, and is finally output to the drive roller. Moreover, the convex rollers and concave rollers adopt a matching concave-convex shape, so that the raw material is shaped after passing through the convex rollers and concave rollers. S2. By starting the second motor to drive the drive roller to rotate, the heat-shrinkable film roll at the outlet of the melt co-extrusion structure is led to the template pre-pressing structure. The heat-shrinkable film roll is wound around the surfaces of two groups of branch rollers, which can evenly distribute the load during the heat-shrinkable film process on the branch rollers, reduce the burden on a single roller, and extend the service life of the equipment. Then, the heat-shrinkable film roll is inserted into the gap between the U-shaped positioning module and the deburring scraper. The heat-shrinkable film roll is bent towards the heat-shrinkable film hot-pressing structure, so that the deburring scraper can remove the fibers that burst after being strongly pressed and expanded on the surface of the heat-shrinkable film roll. The second electric slide table pushes the pre-pressing roller towards the heat-shrinkable film processing die. When the heat-shrinkable film processing die moves, the role of the pre-pressing roller is to clean the surface of the heat-shrinkable film processing die to avoid sand and debris from affecting the pre-stretching of the heat-shrinkable film roll. In addition, the presser presses downward, the buffer module slides on the third electric slide table, and the role of the elastic element is to buffer. When the buffer module contacts the heat-shrinkable film processing die, it extrudes a groove. S3. Start the fifth motor to drive the transmission gear to rotate. The transmission gear meshes with the internal gear groove to drive the heat-shrinkable film processing die to move towards the heat-shrinkable film hot-pressing die. Start the third motor to drive the first conduction gear to rotate. The first conduction gear drives the first transmission belt to drive, thereby driving the first transmission base to move horizontally. The first transmission base drives the second support backplane to move. The fourth motor drives the third conduction gear to rotate. The third conduction gear drives the second transmission belt to drive, and the second transmission belt drives the second moving base to move up and down. The second moving base moves within the limit range of the limit rail. When the second moving base presses down, it drives the heat-shrinkable film hot-pressing die to press the heat-shrinkable film roll at the top of the heat-shrinkable film processing die. The first electric slide table pushes the positioning clamp towards the heat-shrinkable film processing die. Its role is to limit the position of the heat-shrinkable film hot-pressing die, so as to facilitate controlling the pressure applied to the heat-shrinkable film roll more evenly when the heat-shrinkable film hot-pressing die presses down.

[0016] The present invention provides a heat-shrinkable film preparation device and its preparation process through improvement. Compared with the prior art, it has the following improvements and advantages: First, the heat-shrinkable film raw material is shunted into multiple strands of raw material strips through multiple sets of conduction wheels, sorted and transported, and then heated, fused, extruded, and combined into a single strand of heat-shrinkable strip raw material through a merging base. At this step, parts of the heat-shrinkable film raw material damaged due to external factors such as transportation and temperature can be detected, avoiding the problem of uneven heat-shrinkable film caused by directly processing after multiple heat-shrinkable strips are adhered. Then, the heat-shrinkable film raw material is repeatedly extruded through multiple sets of extrusion and heating rollers. Due to the characteristic that the heat-shrinkable film shrinks and deforms when heated, the elasticity and quality of the heat-shrinkable film raw material will be improved after multiple extrusion and heating by the convex roller and concave roller, the thickness of the whole film will be more uniform, and the risk of interlayer peeling will be reduced, avoiding delamination during heat shrinkage, so as to produce a heat-shrinkable film that meets the standards. In addition, six groups of convex rollers and concave rollers are respectively arranged inside the temperature-controlled hot pressing module, which are divided into three areas. Two groups of convex rollers and concave rollers form one area, adopting a segmented temperature control method. The raw material extruded from the merging base reaches the first area, then the second area, and finally the third area, and finally is output to the driving roller. This temperature-controlled stretching method can make the ductility and shrinkage rate of the finally obtained heat-shrinkable film roll more stable, and the mechanical properties can also be improved. Moreover, the convex rollers and concave rollers adopt mutually matching convex and concave shapes, so that the raw material is shaped after passing through the convex rollers and concave rollers, making the edge section of the heat-shrinkable film neater and avoiding the adhesion problem caused by later cutting and trimming.

[0017] Second, by pre-stretching during the preparation process of the heat-shrinkable film, it is avoided that during actual use by the operator, the stretching force is not controlled, resulting in uneven longitudinal and transverse stretching forces of the heat-shrinkable film, and then the phenomenon that the heat-shrinkable film forms a highly oriented fibrous structure and a network of micropores. This structure improves the mechanical properties of the heat-shrinkable film through the pre-stretched film. Specifically, by starting the second motor to drive the driving roller to rotate, the heat-shrinkable film roll at the molten co-extrusion structure discharge port is led to the template pre-pressing structure, and the heat-shrinkable film roll is wound around the surface of two sets of branch rollers, which can evenly distribute the load during the heat-shrinkable film process on the branch rollers, reduce the burden on a single roller, and extend the service life of the equipment. Then, the heat-shrinkable film roll is inserted into the gap between the U-shaped positioning module and the deburring scraper, and the heat-shrinkable film roll is bent towards the heat-shrinkable film hot pressing structure, so that the deburring scraper can remove the fibers that burst after being strongly pressed and expanded on the surface of the heat-shrinkable film roll. The second electric sliding table pushes the pre-pressing roller towards the heat-shrinkable film processing die. When the heat-shrinkable film processing die moves, the role of the pre-pressing roller is to clean the surface of the heat-shrinkable film processing die to avoid dust and debris affecting the pre-stretching of the heat-shrinkable film roll. In addition, the pressure device presses downward, the buffer module slides on the third electric sliding table, and the role of the elastic element is to buffer. When the buffer module contacts the heat-shrinkable film processing die, it extrudes a groove. In addition, start the fifth motor to drive the transmission gear to rotate. The transmission gear meshes with the embedded tooth groove for transmission, which can drive the heat shrink film processing die to move towards the heat shrink film hot pressing die. Start the third motor to drive the first conduction gear to rotate. The first conduction gear drives the first transmission belt for transmission, thereby driving the first transmission base to move horizontally. The first transmission base drives the second support backplane to move. The fourth motor drives the third conduction gear to rotate. The third conduction gear drives the second transmission belt for transmission. The second transmission belt drives the second moving base to move up and down. The second moving base moves within the restricted range of the limit rail. When the second moving base presses down, it will drive the heat shrink film hot pressing die to squeeze the heat shrink film roll film at the top of the heat shrink film processing die. The first electric slide table pushes the positioning clamp to move towards the heat shrink film processing die. Its function is to limit the position of the heat shrink film hot pressing die, facilitating the control of the pressure exerted on the heat shrink film roll film when the heat shrink film hot pressing die presses down to be more uniform. Description of the Drawings

[0018] The present invention will be further explained below in conjunction with the drawings and embodiments: Figure 1 It is a schematic diagram of the first three-dimensional external structure of the present invention; Figure 2 It is a schematic diagram of the internal sectional three-dimensional view of the temperature control hot pressing module of the present invention; Figure 3 For the present invention Figure 1 Partial enlarged schematic diagram at A in Figure 4 It is a second three-dimensional external view of the present invention; Figure 5 It is an exploded three-dimensional schematic diagram of the heat shrink film hot pressing structure of the present invention; Figure 6 It is a partial three-dimensional enlarged schematic diagram of the fifth motor of the present invention.

[0019] Description of the reference numerals: 1, fixed base; 2, melt co-extrusion structure; 201, first motor; 202, hollow frame; 203, heat shrinkable film raw material; 204, flow divider; 205, conduction wheel; 206, strand base; 207, temperature-controlled hot pressing module; 208, convex roller; 209, concave roller; 3, transfer structure; 301, second motor; 302, first support plate; 303, driving roller; 4, heat shrinkable film roll; 5, heat shrinkable film hot pressing structure; 501, first support back plate; 502, third motor; 503, first conduction gear; 504, second conduction gear; 505, first drive belt; 506, first drive base; 507, second support back plate; 508, fourth motor; 509, second moving base; 510, heat shrinkable film hot pressing die; 511, first electric slide; 512, positioning clamp; 513, heat shrinkable film processing die; 514, embedded tooth groove; 515, fifth motor; 516, drive tooth; 517, third conduction gear; 518, second drive belt; 519, limit rail; 6, template pre-pressing structure; 601, second support plate; 602, branch roller; 603, press; 604, second electric slide; 605, pre-pressing roller; 606, buffer module; 607, elastic element; 608, U-shaped positioning module; 609, deburring scraper; 610, third electric slide. Detailed implementation

[0020] The following will be combined with the attached Figures 1 to 6 The present invention will be described in detail. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] The present invention provides a heat shrinkable film preparation device and preparation process through improvement, including a fixed base 1 and a heat shrinkable film roll 4. One end of the fixed base 1 is installed with a melt co-extrusion structure 2, and the melt co-extrusion structure 2 prepares the heat shrinkable film roll 4. Among them, the melt co-extrusion structure 2 includes a first motor 201, a flow divider 204 and a temperature-controlled hot pressing module 207. The first motor 201 is installed on the top of the fixed base 1, and a flow divider 204 is provided on one side of the first motor 201, and a temperature-controlled hot pressing module 207 is provided on one side of the flow divider 204. The melt co-extrusion structure 2 further includes a hollow frame 202, and the hollow frame 202 is installed on the top of the fixed base 1. A first motor 201 is installed on one side of the hollow frame 202, and a heat shrinkable film raw material 203 is installed at the output end of the first motor 201. Among them, conduction wheels 205 are installed at the four peripheral edges of the flow splitter 204. First, the heat shrink film raw material 203 is split into multiple strands of raw material strips and sorted and transported through multiple groups of conduction wheels 205. A merging base 206 is installed on the side of the flow splitter 204 away from the hollow frame 202. Then, through heating, fusing, and extrusion by the merging base 206, the multiple strands are combined into one heat shrink strip raw material. The heat shrink film raw material 203 is in contact with the surface of the conduction wheels 205, and after passing through the conduction wheels 205, the heat shrink film raw material 203 passes through the middle of the merging base 206. This step can detect the damaged parts of the heat shrink film raw material 203 due to external factors such as transportation and temperature, and avoid the problem of uneven heat shrink film caused by directly processing after multiple heat shrink strips are adhered together. A convex roller 208 is installed at the top end inside the temperature-controlled hot pressing module 207, and a concave roller 209 is installed at the bottom end inside the temperature-controlled hot pressing module 207. There are a total of six groups of convex rollers 208 and concave rollers 209. Among them, the temperature-controlled hot pressing module 207 is divided into three regions, and two groups of convex rollers 208 and concave rollers 209 form one region. There are six groups of convex rollers 208 and concave rollers 209 respectively inside the temperature-controlled hot pressing module 207, which are divided into three regions, and two groups of convex rollers 208 and concave rollers 209 form one region. A segmented temperature control method is adopted. The raw material extruded from the merging base 206 reaches 150 - 160 °C in the first region, then reaches 170 - 180 °C in the second region, and finally reaches 180 - 190 °C in the third region, and finally is output to the driving roller 303. This temperature control and stretching method can make the ductility and shrinkage rate of the finally obtained heat shrink film roll 4 more stable, and the mechanical properties can also be improved. Among them, the outer shapes of the convex roller 208 and the concave roller 209 cooperate with each other. Then, the heat shrink film raw material is repeatedly extruded by the extrusion heat rollers composed of the convex roller 208 and the concave roller 209. Because of the characteristic that the heat shrink film shrinks and deforms when heated, the elasticity and quality of the heat shrink film raw material will be improved after multiple extrusions and heating by the convex roller 208 and the concave roller 209. The thickness of the whole film will be more uniform, and the risk of interlayer peeling will be reduced, avoiding delamination during heat shrinkage, so as to produce a heat shrink film that meets the standards. Moreover, the convex roller 208 and the concave roller 209 adopt mutually cooperating concave and convex outer shapes, so that the raw material is shaped after passing through the convex roller 208 and the concave roller 209, making the edge section of the heat shrink film neater and avoiding the adhesion problem caused by later cutting and trimming. A transfer structure 3 is installed at one end of the melt co-extrusion structure 2. The transfer structure 3 includes a first support plate 302, and the bottom end of the first support plate 302 is fixedly connected to the fixed base 1. A second motor 301 is installed on one side of the first support plate 302, and a driving roller 303 is installed at the output end of the second motor 301. The surface of the driving roller 303 is in contact connection with the heat shrink film roll 4. Moreover, a template pre-pressing structure 6 is installed at one end of the transfer structure 3 away from the melt co-extrusion structure 2. The second motor 301 is started to drive the driving roller 303 to rotate, and the heat-shrinkable film coil 4 at the discharging place of the melt co-extrusion structure 2 is led to the template pre-pressing structure 6. The template pre-pressing structure 6 includes a second support plate 601, and the bottom end of the second support plate 601 is fixedly connected to the fixed base 1. At the top end of one side of the second support plate 601, two sets of branch rollers 602 are installed. By winding the heat-shrinkable film coil 4 around the surfaces of the two sets of branch rollers 602, the load during the heat-shrinkable film process can be evenly distributed on the branch rollers 602, reducing the burden on a single roller and extending the service life of the equipment. A pressure device 603 is installed on one side of the second support plate 601, and a buffer module 606 is provided at the bottom end of the pressure device 603. The buffer module 606 is divided into two upper and lower groups, and an elastic element 607 is installed at the connection of the two buffer modules 606. The function of the elastic element 607 is to buffer. Among them, a third electric sliding table 610 is installed on one side of the second support plate 601 close to the buffer module 606. The pressure device 603 presses downward, and the buffer module 606 slides on the third electric sliding table 610. A heat-shrinkable film hot-pressing structure 5 is installed at one end of the template pre-pressing structure 6 away from the transfer structure 3, and the heat-shrinkable film hot-pressing structure 5 pre-stretches the heat-shrinkable film coil 4; A second electric sliding table 604 is installed at one end of one side of the second support plate 601, and a pre-pressing roller 605 is installed at the output end of the second electric sliding table 604; the second electric sliding table 604 pushes the pre-pressing roller 605 towards the heat-shrinkable film processing die 513. When the heat-shrinkable film processing die 513 moves, the function of the pre-pressing roller 605 is to clean the surface of the heat-shrinkable film processing die 513 to prevent dust and lint from affecting the pre-stretching of the heat-shrinkable film coil 4. A U-shaped positioning module 608 is installed on one side of the buffer module 606 away from the pre-pressing roller 605, and a deburring scraper 609 is installed on one side of the U-shaped positioning module 608. The heat-shrinkable film coil 4 passes through the connection of the contact surfaces of the U-shaped positioning module 608 and the deburring scraper 609. The heat-shrinkable film coil 4 is inserted into the gap between the U-shaped positioning module 608 and the deburring scraper 609, and the heat-shrinkable film coil 4 is bent towards the heat-shrinkable film hot-pressing structure 5, so that the deburring scraper 609 can remove the fibers that burst after being strongly pressed and expanded on the surface of the heat-shrinkable film coil 4; By pre-stretching during the preparation of the heat-shrinkable film, it is avoided that the operator fails to control the stretching force during actual use, resulting in uneven longitudinal and transverse stretching forces of the heat-shrinkable film, and thus the phenomenon of the heat-shrinkable film forming a highly oriented fibrous structure and a reticular micropore. This structure improves the mechanical properties of the heat-shrinkable film by pre-stretching the film. Among them, the heat-shrinkable film hot-pressing structure 5 includes a fourth motor 508, a heat-shrinkable film hot-pressing die 510 and a heat-shrinkable film processing die 513. The fourth motor 508 is installed at the top of the fixed base 1, and the output end of the fourth motor 508 is connected with the heat-shrinkable film hot-pressing die 510 through transmission. The heat-shrinkable film processing die 513 is provided at the bottom end of the heat-shrinkable film hot-pressing die 510.

[0022] On one side of the top end of the fixed base 1, a first support back plate 501 is fixedly installed. A third motor 502 is installed on one side of the first support back plate 501, and a first transmission gear 503 is installed at the output end of the third motor 502. Starting the third motor 502 drives the first transmission gear 503 to rotate. On the side of the first support back plate 501 away from the first transmission gear 503, a second transmission gear 504 is installed. Among them, the first transmission belt 505 is in surface contact connection with the first transmission gear 503 and the second transmission gear 504. The first transmission gear 503 drives the first transmission belt 505 to transmit, and the first transmission base 506 is installed at the bottom end of the first transmission belt 505, so as to drive the first transmission base 506 to move along the horizontal direction. One end of the first transmission base 506 is installed with a second support back plate 507, and the first transmission base 506 drives the second support back plate 507 to move; One end of the second support back plate 507 is installed with a fourth motor 508, and a third transmission gear 517 is installed at the output end of the fourth motor 508. The fourth motor 508 drives the third transmission gear 517 to rotate. There are two groups of the third transmission gears 517 up and down in total, and the second group of the third transmission gears 517 is installed at the bottom end of the second support back plate 507. Among them, the second transmission belt 518 is in surface contact connection with the two groups of the third transmission gears 517. The third transmission gear 517 drives the second transmission belt 518 to transmit, and a second moving base 509 is installed on one side of the second transmission belt 518. The second transmission belt 518 drives the second moving base 509 to move up and down. A limiting rail 519 is installed on the side of the second support back plate 507 close to the second moving base 509, and the second moving base 509 moves within the limiting range of the limiting rail 519. Among them, the heat-shrinkable film hot-pressing die 510 is installed at the bottom end of the limiting rail 519. When the second moving base 509 presses down, it will drive the heat-shrinkable film hot-pressing die 510 to squeeze the heat-shrinkable film roll 4 at the top end of the heat-shrinkable film processing die 513. A first electric sliding table 511 is installed on one side of the second support back plate 507, and a positioning clamp 512 is installed on the side of the first electric sliding table 511 close to the heat-shrinkable film hot-pressing die 510. The first electric sliding table 511 pushes the positioning clamp 512 to move towards the heat-shrinkable film processing die 513. The function is to limit the position of the heat-shrinkable film hot-pressing die 510, so as to facilitate controlling the pressure applied by the heat-shrinkable film hot-pressing die 510 to the heat-shrinkable film roll 4 when pressing down to be more uniform; Among them, a fifth motor 515 is installed on one side of the fixed base 1 close to the transfer structure 3, and a transmission tooth 516 is installed on the output end of the fifth motor 515. The fifth motor 515 is started to drive the transmission tooth 516 to rotate. An embedded tooth groove 514 is installed on the top of the transmission tooth 516. The transmission tooth 516 and the embedded tooth groove 514 are meshed for transmission, and the embedded tooth groove 514 and the heat shrink film processing mold 513 are meshed for transmission. One side of the embedded tooth groove 514 is fixedly connected to the heat shrink film processing mold 513, which can drive the heat shrink film processing mold 513 to move in the direction of the heat shrink film hot pressing mold 510. A heat shrink film preparation process comprises the following steps: S1. First, the heat shrink film raw material 203 is diverted through multiple groups of conduction wheels 205, and then heated, fused, extruded and merged into a heat shrink strip raw material through the stranding base 206, and then repeatedly extruded through multiple groups of convex rollers 208 and concave rollers 209. Six groups of convex rollers 208 and concave rollers 209 are respectively arranged inside the temperature control hot pressing module 207, which are divided into three areas. Two groups of convex rollers 208 and concave rollers 209 are one area. The segmented temperature control method is adopted. The raw material extruded by the stranding base 206 reaches 150-160°C in the first area, then reaches 170-180°C in the second area, and finally reaches 180-190°C in the third area, and finally outputs to the transmission roller 303. The convex roller 208 and the concave roller 209 adopt mutually matching concave and convex shapes, so that the raw material is shaped after passing through the convex roller 208 and the concave roller 209; S2, by starting the second motor 301 to drive the transmission roller 303 to rotate, the heat shrink film roll 4 at the discharge of the molten co-extrusion structure 2 is led to the template pre-pressing structure 6, and the heat shrink film roll 4 is wound on the surface of the two sets of branch rollers 602, so that the load in the heat shrink film process can be evenly distributed on the branch rollers 602, reducing the burden of a single roller and extending the service life of the equipment. Then, the heat shrink film roll 4 is inserted into the gap between the U-shaped positioning module 608 and the deburring scraper 609, and the heat shrink film roll 4 is bent toward the direction of the heat shrink film hot pressing structure 5, so that the deburring scraper 609 can To remove the fibers that burst after being stretched open by strong pressure on the surface of the heat shrink film roll 4, the second electric slide 604 pushes the pre-pressing roller 605 toward the direction of the heat shrink film processing mold 513. When the heat shrink film processing mold 513 moves, the pre-pressing roller 605 cleans the surface of the heat shrink film processing mold 513 to prevent dust and hair from affecting the pre-stretching of the heat shrink film roll 4. In addition, the pressure device 603 applies pressure to the bottom end, and the buffer module 606 slides on the third electric slide 610. The elastic element 607 is used for buffering. When the buffer module 606 contacts the heat shrink film processing mold 513, a groove is squeezed out; S3. Start the fifth motor 515 to drive the transmission gear 516 to rotate. The transmission gear 516 meshes with the embedded tooth groove 514 for transmission, which can drive the heat shrink film processing die 513 to move towards the heat shrink film hot pressing die 510. Start the third motor 502 to drive the first conduction gear 503 to rotate. The first conduction gear 503 drives the first transmission belt 505 for transmission, thereby driving the first transmission base 506 to move horizontally. The first transmission base 506 drives the second support back plate 507 to move. The fourth motor 508 drives the third conduction gear 517 to rotate. The third conduction gear 517 drives the second transmission belt 518 for transmission. The second transmission belt 518 drives the second moving base 509 to move up and down. The second moving base 509 moves within the restricted range of the limit rail 519. When the second moving base 509 presses down, it will drive the heat shrink film hot pressing die 510 to squeeze the heat shrink film roll film 4 at the top of the heat shrink film processing die 513. The first electric slide 511 pushes the positioning clamp 512 to move towards the heat shrink film processing die 513. Its function is to limit the position of the heat shrink film hot pressing die 510, facilitating more uniform pressure applied to the heat shrink film roll film 4 when the heat shrink film hot pressing die 510 presses down. Working principle: First, the heat shrink film raw material 203 is shunted by multiple groups of conduction wheels 205, and then heated, fused, extruded, and merged into a single heat shrink strip raw material through the parallel-strand base 206. Then, the heat shrink film raw material is repeatedly extruded through multiple groups of convex rollers 208 and concave rollers 209. There are six groups of convex rollers 208 and concave rollers 209 respectively inside the temperature-controlled hot pressing module 207, divided into three areas. Two groups of convex rollers 208 and concave rollers 209 form one area, adopting a segmented temperature control method. The raw material extruded from the parallel-strand base 206 reaches 150 - 160 °C in the first area, then reaches 170 - 180 °C in the second area, and finally reaches 180 - 190 °C in the third area, and finally is output to the drive roller 303. Moreover, the convex rollers 208 and concave rollers 209 adopt a mutually matching concave-convex shape, enabling the raw material to be shaped after passing through the convex rollers 208 and concave rollers 209.

[0023] Then, by starting the second motor 301 to drive the transmission roller 303 to rotate, the heat-shrinkable film roll 4 at the discharging position of the melt co-extrusion structure 2 is led to the template pre-pressing structure 6. The heat-shrinkable film roll 4 is wound around the surfaces of the two groups of branch rollers 602, so that the load during the heat-shrinkable film process can be evenly distributed on the branch rollers 602, reducing the burden on a single roller and extending the service life of the equipment. Then, the heat-shrinkable film roll 4 is inserted into the gap between the U-shaped positioning module 608 and the deburring scraper 609. The heat-shrinkable film roll 4 is bent towards the heat-shrinkable film hot-pressing structure 5, enabling the deburring scraper 609 to remove the fibers that burst after being strongly pressed and expanded on the surface of the heat-shrinkable film roll 4. The second electric slide table 604 pushes the pre-pressing roller 605 towards the heat-shrinkable film processing die 513. When the heat-shrinkable film processing die 513 moves, the function of the pre-pressing roller 605 is to clean the surface of the heat-shrinkable film processing die 513 to prevent dust and debris from affecting the pre-stretching of the heat-shrinkable film roll 4. In addition, the pressure device 603 presses towards the bottom end. The buffer module 606 slides on the third electric slide table 610, and the elastic element 607 functions as a buffer. When the buffer module 606 contacts the heat-shrinkable film processing die 513, it extrudes a groove.

[0024] Finally, start the fifth motor 515 to drive the transmission gear 516 to rotate. The transmission gear 516 meshes with the internal gear groove 514 to drive the heat-shrinkable film processing die 513 to move towards the heat-shrinkable film hot-pressing die 510. Start the third motor 502 to drive the first transmission gear 503 to rotate. The first transmission gear 503 drives the first transmission belt 505 to drive, thereby driving the first transmission base 506 to move horizontally. The first transmission base 506 drives the second support back plate 507 to move. The fourth motor 508 drives the third transmission gear 517 to rotate. The third transmission gear 517 drives the second transmission belt 518 to drive. The second transmission belt 518 drives the second moving base 509 to move up and down. The second moving base 509 moves within the limit range of the limit rail 519. When the second moving base 509 presses down, it drives the heat-shrinkable film hot-pressing die 510 to press the heat-shrinkable film roll 4 at the top of the heat-shrinkable film processing die 513. The first electric slide table 511 pushes the positioning clamp 512 towards the heat-shrinkable film processing die 513, and its function is to limit the position of the heat-shrinkable film hot-pressing die 510, facilitating the control of the pressure applied to the heat-shrinkable film roll 4 when the heat-shrinkable film hot-pressing die 510 presses down to be more uniform.

[0025] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat shrinkable film preparation device and preparation process, comprising a fixed base (1) and a heat shrinkable film roll (4), characterized in that: One end of the fixed base (1) is installed with a melt co-extrusion structure (2), and the melt co-extrusion structure (2) prepares a heat-shrinkable film roll (4). One end of the melt co-extrusion structure (2) is installed with a transfer structure (3), and one end of the transfer structure (3) away from the melt co-extrusion structure (2) is installed with a template pre-pressing structure (6). One end of the template pre-pressing structure (6) away from the transfer structure (3) is installed with a heat-shrinkable film hot-pressing structure (5), and the heat-shrinkable film hot-pressing structure (5) pre-stretches the heat-shrinkable film roll (4). Among them, the melt co-extrusion structure (2) includes a first motor (201), a flow divider (204) and a temperature-controlled hot-pressing module (207). The first motor (201) is installed at the top of the fixed base (1), and a flow divider (204) is arranged on one side of the first motor (201). A temperature-controlled hot-pressing module (207) is arranged on one side of the flow divider (204). Among them, the heat-shrinkable film hot-pressing structure (5) includes a fourth motor (508), a heat-shrinkable film hot-pressing die (510) and a heat-shrinkable film processing die (513). The fourth motor (508) is installed at the top of the fixed base (1), and the output end of the fourth motor (508) is connected with a heat-shrinkable film hot-pressing die (510) through transmission. A heat-shrinkable film processing die (513) is arranged at the bottom of the heat-shrinkable film hot-pressing die (510).

2. The heat shrinkable film preparation device according to claim 1, characterized in that: The melt co-extrusion structure (2) further includes a hollow frame (202), and the hollow frame (202) is installed at the top of the fixed base (1). A first motor (201) is installed on one side of the hollow frame (202), and a heat-shrinkable film raw material (203) is installed at the output end of the first motor (201). Among them, conduction wheels (205) are installed on the four peripheral edges of the flow divider (204). A merging base (206) is installed on one side of the flow divider (204) away from the hollow frame (202). The heat-shrinkable film raw material (203) is in contact with the surface of the conduction wheels (205), and the heat-shrinkable film raw material (203) passes through the middle of the merging base (206) after passing through the conduction wheels (205).

3. The heat shrinkable film preparation device according to claim 2, wherein: A convex roller (208) is installed at the top inside the temperature-controlled hot-pressing module (207), and a concave roller (209) is installed at the bottom inside the temperature-controlled hot-pressing module (207). There are a total of six groups of the convex roller (208) and the concave roller (209). Among them, the inside of the temperature-controlled hot-pressing module (207) is divided into three areas, and two groups of the convex roller (208) and the concave roller (209) are in one area. Among them, the outer shapes of the convex roller (208) and the concave roller (209) are matched and engaged with each other.

4. The heat shrinkable film manufacturing apparatus according to claim 1, wherein: The transfer structure (3) includes a first support plate (302), and the bottom end of the first support plate (302) is fixedly connected with the fixed base (1). A second motor (301) is installed on one side of the first support plate (302), and a driving roller (303) is installed at the output end of the second motor (301). The surface of the driving roller (303) is in contact connection with the heat-shrinkable film roll (4).

5. The heat shrinkable film preparation device according to claim 1, characterized in that: The template preloading structure (6) includes a second support plate (601), and the bottom end of the second support plate (601) is fixedly connected to the fixed base (1). At the top end of one side of the second support plate (601), there are two sets of branch rollers (602) installed. On one side of the second support plate (601), there is a pressure device (603) installed. At the bottom end of the pressure device (603), there is a buffer module (606), and the buffer module (606) is divided into two groups, upper and lower. At the connection of the two groups of buffer modules (606), there is an elastic element (607). Among them, on one side of the second support plate (601) close to the buffer module (606), there is a third electric sliding table (610) installed.

6. The heat shrinkable film preparation device according to claim 5, wherein: At one end of one side of the second support plate (601), there is a second electric sliding table (604) installed, and at the output end of the second electric sliding table (604), there is a preloading roller (605) installed.

7. A heat-shrinkable film preparation device according to claim 6, characterized in that: On the side of the buffer module (606) away from the preloading roller (605), there is a U-shaped positioning module (608) installed, and on one side of the U-shaped positioning module (608), there is a deburring scraper (609) installed. The heat shrink film roll (4) passes through the connection of the contact surface of the U-shaped positioning module (608) and the deburring scraper (609).

8. The preparation device of a heat-shrinkable film according to claim 1, characterized in that: On one side of the top end of the fixed base (1), there is a first support backplate (501) fixedly installed. On one side of the first support backplate (501), there is a third motor (502) installed, and at the output end of the third motor (502), there is a first transmission gear (503) installed. On the side of the first support backplate (501) away from the first transmission gear (503), there is a second transmission gear (504) installed. Among them, the surfaces of the first transmission gear (503) and the second transmission gear (504) are in contact connection with a first transmission belt (505), and at the bottom end of the first transmission belt (505), there is a first transmission base (506) installed. At one end of the first transmission base (506), there is a second support backplate (507) installed.

9. A heat-shrinkable film preparation device according to claim 8, characterized in that: At one end of the second support backplate (507), there is a fourth motor (508) installed, and at the output end of the fourth motor (508), there are two sets of third transmission gears (517) installed, up and down. The second set of third transmission gears (517) is installed at the bottom end of the second support backplate (507). Among them, the surfaces of the two sets of third transmission gears (517) are in contact connection with a second transmission belt (518), and on one side of the second transmission belt (518), there is a second moving base (509) installed. On the side of the second support backplate (507) close to the second moving base (509), there is a limiting rail (519) installed. Among them, at the bottom end of the limiting rail (519), there is a heat shrink film hot pressing die (510) installed. On one side of the second support backplate (507), there is a first electric sliding table (511) installed, and on the side of the first electric sliding table (511) close to the heat shrink film hot pressing die (510), there is a positioning clamp (512) installed. Wherein, a fifth motor (515) is installed on one side of the fixed base (1) close to the transfer structure (3), and a transmission gear (516) is installed at the output end of the fifth motor (515). An embedded tooth groove (514) is installed at the top of the transmission gear (516), and the embedded tooth groove (514) is in meshing transmission with the heat shrink film processing die (513). One side of the embedded tooth groove (514) is fixedly connected to the heat shrink film processing die (513).

10. A heat shrinkable film preparation process, comprising a heat shrinkable film preparation device according to any one of claims 2-9, characterized in that, It includes the following steps: S1. First, the heat shrink film raw material (203) is shunted by multiple groups of conduction wheels (205), and then heated, fused, and extruded through the parallel-strand base (206) to be combined into a single heat shrink strip raw material. Then, the heat shrink film raw material is repeatedly extruded through multiple groups of convex rollers (208) and concave rollers (209). Six groups of convex rollers (208) and concave rollers (209) are respectively arranged inside the temperature-controlled hot pressing module (207), which are divided into three areas. Two groups of convex rollers (208) and concave rollers (209) form one area. The segmented temperature control method is adopted. The raw material extruded from the parallel-strand base (206) reaches the first area (150 - 160 °C), then reaches the second area (170 - 180 °C), and finally reaches the third area (180 - 190 °C), and finally is output to the driving roller (303). The convex rollers (208) and concave rollers (209) adopt mutually matching convex and concave shapes, so that the raw material is shaped after passing through the convex rollers (208) and concave rollers (209). S2. By starting the second motor (301) to drive the driving roller (303) to rotate, the heat shrink film roll (4) at the discharging place of the melt co-extrusion structure (2) is led to the template pre-pressing structure (6). The heat shrink film roll (4) is wound around the surfaces of two groups of branch rollers (602), which can evenly distribute the load during the heat shrink film process on the branch rollers (602), reduce the burden on a single roller, and extend the service life of the equipment. Then, the heat shrink film roll (4) is inserted into the gap between the U-shaped positioning module (608) and the deburring scraper (609). The heat shrink film roll (4) is bent towards the heat shrink film hot pressing structure (5), so that the deburring scraper (609) can remove the fibers that burst after the surface of the heat shrink film roll (4) is strongly pressed and expanded. The second electric slide table (604) pushes the pre-pressing roller (605) towards the heat shrink film processing die (513). When the heat shrink film processing die (513) moves, the function of the pre-pressing roller (605) is to clean the surface of the heat shrink film processing die (513) to prevent dust and debris from affecting the pre-stretching of the heat shrink film roll (4). In addition, the pressure device (603) presses towards the bottom end. The buffer module (606) slides on the third electric slide table (610), and the elastic element (607) functions as a buffer. When the buffer module (606) contacts the heat shrink film processing die (513), it extrudes a groove. S3. Start the fifth motor (515) to drive the transmission gear (516) to rotate. The transmission gear (516) meshes with the embedded tooth groove (514) for transmission, which can drive the heat shrink film processing die (513) to move towards the heat shrink film hot pressing die (510). Start the third motor (502) to drive the first conduction gear (503) to rotate. The first conduction gear (503) drives the first transmission belt (505) for transmission, thereby driving the first transmission base (506) to move horizontally. The first transmission base (506) drives the second support backplate (507) to move. The fourth motor (508) drives the third conduction gear (517) to rotate. The third conduction gear (517) drives the second transmission belt (518) for transmission. The second transmission belt (518) drives the second moving base (509) to move up and down. The second moving base (509) moves within the limit range of the limit rail (519). When the second moving base (509) presses down, it will drive the heat shrink film hot pressing die (510) to squeeze the heat shrink film roll film (4) at the top of the heat shrink film processing die (513). The first electric slide (511) pushes the positioning clamp (512) to move towards the heat shrink film processing die (513). Its function is to limit the position of the heat shrink film hot pressing die (510), making it easier to control the pressure applied to the heat shrink film roll film (4) when the heat shrink film hot pressing die (510) presses down more evenly.

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