Production process of laser medium transfer paper

Abstract

A production process of laser medium transfer paper comprises the following steps: S1, coating a BOPET film with a waterborne polyurethane laser transfer coating by adopting a coating machine to form a laser transfer coating; s2, carrying out laser holographic mold pressing on the laser transfer coating by adopting a laser holographic mold pressing machine to form a holographic mold pressing layer, so as to prepare a BOPET laser mold pressing film; s3, evaporating a zinc sulfide medium layer on the BOPET laser molded film on a vacuum coating machine to prepare a BOPET laser medium transfer film; s4, removing impurities and peculiar smell of the BOPET laser medium transfer film on a film splitting machine, and trimming the BOPET laser medium transfer film to prepare a BOPET laser medium transfer finished product film; the thin film splitting machine comprises a machine frame, a thin film unwinding device, an adsorption device, a blowing, humidifying and drying device, a trimming device and a thin film winding device. And S5, compounding, drying and stripping the BOPET laser medium transfer finished product film on a wet compounding machine to prepare the laser medium transfer paper. The laser medium transfer paper free of impurities and low in peculiar smell residue can be prepared.

Description

Technical Field

[0001] The invention relates to the technical field of laser medium transfer paper processing, and in particular to a production process of laser medium transfer paper. Background Art

[0002] Laser transfer paper is divided into laser aluminized transfer paper and laser medium transfer paper according to the different protective layers (reflective layers) that are deposited. Laser aluminized transfer paper is often called laser mirror silver card paper because of the mirror reflection of the aluminum layer and the poor bottom transparency of the aluminum layer. Laser medium transfer paper, commonly used medium material is zinc sulfide, and zinc sulfide itself has a pungent smell similar to rotten eggs. At the same time, due to the poor adhesion between zinc sulfide and solvent-based transfer coatings, the laser transfer coating after holographic molding must be subjected to two corona treatments by a corona machine to make its surface tension reach more than 48 dynes before it can be plated with medium zinc sulfide on a vacuum coating machine. The corona machine will produce a large amount of ozone during corona treatment, and the ozone will not only remain on the coating, but its smell will also irritate the operator.

[0003] At present, the process of vacuum evaporation of zinc sulfide is as follows: a pot is set in the evaporation tank of the vacuum coating machine, and the block zinc sulfide is placed on the pot to heat. When a certain temperature is reached, the zinc sulfide evaporates to form gaseous zinc sulfide. After the gaseous zinc sulfide is cooled at the main roller position of the vacuum coating machine, the gaseous zinc sulfide is deposited on the surface of the evaporated film, and the zinc sulfide evaporated film is obtained after winding. However, the problem with the medium paper evaporated with zinc sulfide by this process is that when evaporating zinc sulfide, in addition to the zinc sulfide deposited on the surface of the evaporated film, there are also a small amount of zinc sulfide particles that have not been completely evaporated. When the paper is compounded, the zinc sulfide particles will produce compound dirty spots and embossing. At the same time, the dirty spots are also the main source of the odor of the medium paper.

[0004] In order to solve the above problems, a Chinese invention patent with authorization announcement number CN102553121B discloses a device and method for removing the odor of zinc sulfide laser dielectric film, wherein the method comprises the following steps: (1) unwinding, the zinc sulfide laser dielectric film enters the desulfurization tank for desulfurization; (2) a pH tester detects the pH value of the Na2HPO4 solution in the desulfurization tank in real time. When the pH value of the Na2HPO4 solution in the desulfurization tank is less than 7.4, the pH tester feeds back the detection information to the controller, and the controller responds to the detection information according to the information. Open the valve switch of the liquid storage tank and automatically add 0.1-0.3 mol / L Na2HPO4 solution; when the pH tester detects that the pH value of the Na2HPO4 solution in the desulfurization tank is maintained between 7.4 and 8.0, the pH tester transmits this information to the controller, and the controller closes the valve of the liquid storage tank based on the information; (3) Then the zinc sulfide laser dielectric film passes through the water spray cleaning device of the clean water tank to remove the Na2HPO4 solution attached to it, enters the squeezing device to remove excess water, and then enters the oven for drying, and finally rolls up. However, this method of removing odor by washing with water has the following problems: (1) Although the zinc sulfide particles on the dielectric film can be washed away by the water washing method, the washed zinc sulfide particles will also fall into the cleaning tank. The zinc sulfide particles that fall into the cleaning tank will also be adsorbed on the surface of the cleaned dielectric film under the flow of water in the cleaning tank, resulting in incomplete removal of the zinc sulfide particles; (2) When using the water washing method, due to the slow drying nature of water, a higher drying temperature must be used to avoid poor drying that causes adhesion and oxidation of the washed dielectric film. If the drying temperature is too high, it will cause defects such as missing, whitening, and blurring of the holographic image on the zinc sulfide dielectric film. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a production process for laser medium transfer paper, which can prepare laser medium transfer paper without impurities and with low odor residue, and can not only solve the problem of incomplete cleaning of zinc sulfide particles in the conventional water washing process, but also prevent the occurrence of defects such as adhesion, oxidation, missing holographic images, whitening, and hollowness caused by poor drying. The technical solution adopted is as follows: A production process of laser medium transfer paper, characterized by comprising the following steps: S1. coating the surface of the BOPET film with a water-based polyurethane laser transfer coating using a coating machine to form a laser transfer coating; S2, using a laser holographic embossing machine to holographically emboss the laser transfer coating to form a holographic embossing layer to obtain a BOPET laser embossing film; S3, evaporating a zinc sulfide dielectric layer on the BOPET laser molded film obtained in S2 on a vacuum coating machine to obtain a BOPET laser dielectric transfer film; S4, removing impurities, removing odors and trimming the BOPET laser medium transfer film obtained in S3 on a film slitting machine to obtain a BOPET laser medium transfer finished product film; The film slitting machine used includes a frame, a film unwinding device, an adsorption device, a blowing humidification and drying device, a trimming device and a film winding device; the film unwinding device, the adsorption device, the blowing humidification and drying device, the trimming device and the film winding device are all installed on the frame and arranged in sequence along the conveying direction of the film; the adsorption device can adsorb impurities and odors on the surface of the film, so as to remove impurities and odors; the blowing humidification and drying device can blow, humidify and dry the surface of the film, so as to remove impurities and odors; the trimming device can trim the film; S5, compounding, drying and peeling the BOPET laser medium transfer finished film obtained in S4 on a wet compounding machine, so that the laser transfer coating of the BOPET laser medium transfer finished film is compounded on the paper through the adhesive layer to make laser medium transfer paper.

[0006] In the above production process, in step S1, the laser transfer coating adopts water-based polyurethane laser transfer coating, which can make the BOPET film free of organic solvent residues, and because the surface tension of the laser transfer coating is high, the laser transfer coating does not need to undergo secondary corona treatment in step S3, and can be directly used for vacuum coating machine to evaporate zinc sulfide dielectric layer, and when the laser transfer coating is transferred to the paper, no varnish layer is required, which reduces the production cost and improves the glossiness of the laser information; in step S4, the film slitting machine can automatically complete the process of removing impurities, removing odors and trimming the BOPET laser dielectric transfer film, which greatly reduces the defects such as dirty spots and embossing caused by zinc sulfide particles in the wet laminating machine in step S5, and at the same time can reduce the process flow and process loss of the laser dielectric film.

[0007] When the film slitting machine is working, the film roll formed by the BOPET laser medium transfer film obtained in step S3 can be installed on the film unwinding device; the BOPET laser medium transfer film released by the film unwinding device passes through the adsorption device, the blowing humidification drying device and the trimming device in sequence under the drive of the film winding device, so as to complete the process of removing impurities, removing odors and trimming the BOPET laser medium transfer film; finally, the obtained BOPET laser medium transfer finished film is wound up at the film winding device; when the BOPET laser medium transfer finished film passes through the adsorption device, the adsorption device humidifies the BOPET laser medium transfer film. The zinc sulfide particles and odor on the surface of the finished film are absorbed to achieve the first impurity and odor removal; when the laser medium transfer film passes through the blowing, humidifying and drying device, the blowing, humidifying and drying device blows, humidifies and dries the surface of the BOPET laser medium transfer finished film to achieve the second impurity and odor removal; when the laser medium transfer film passes through the trimming device, the trimming device cuts the edge of the BOPET laser medium transfer finished film to achieve trimming; finally, the trimmed BOPET laser medium transfer finished film is wound up by the film winding device and then sent to the process equipment of step S5.

[0008] As a preferred embodiment of the present invention, the thickness of the BOPET film used in step S1 is 12um-14um.

[0009] Generally, the coating machine used in step S1 is a coating machine with an anilox roller and a scraper, and the coating anilox roller used is a 200# steel plate, and the coating dry weight is 1.1-1.3 g / ㎡.

[0010] As a preferred embodiment of the present invention, the laser holographic embossing machine used in step S2 is one of a single-plate holographic embossing machine, a single-plate positioning holographic embossing machine and a seamless holographic embossing machine.

[0011] As a preferred embodiment of the present invention, the adsorption device includes a first drive motor, a centrifugal fan, at least one slotted guide roller and at least one suction pipe, the first drive motor and the centrifugal fan are both mounted on a frame, the slotted guide roller is arranged on one side of the film, the slotted guide roller includes a roller body, a first connecting shaft and a second connecting shaft, the first connecting shaft and the second connecting shaft are respectively connected to the center of the two end surfaces of the roller body, the first connecting shaft and the second connecting shaft can be rotatably mounted on the frame and the axes of the two coincide, the first connecting shaft or the second connecting shaft and the power output of the first drive motor The roller body is connected by shaft transmission; the roller body has an air guide cavity inside, and the outer peripheral surface of the roller body is provided with a plurality of strip grooves arranged in sequence along its outer circumference, the extension direction of the strip grooves is consistent with the axial direction of the roller body, and each strip groove is connected with the air guide cavity and corresponds to the surface position of the film; the first connecting shaft is provided with an air guide channel connected with the air guide cavity; the air suction pipe is arranged between the corresponding slotted guide roller and the centrifugal fan, one end of the air suction pipe is connected to the end of the first connecting shaft away from the roller body through a rotating joint, and the other end of the air suction pipe is connected with the air inlet of the centrifugal fan. Specifically, the longitudinal width of the strip groove is 1-2mm, and a strip groove is arranged every 40-50mm in the circumferential direction of the slotted guide roller, and the length of the strip groove is greater than the transverse width of the film. During operation, the slotted guide roller rotates continuously driven by the first drive motor, and at the same time, the centrifugal fan draws air from the air guide cavity inside the roller body through the air suction pipe and the air guide channel of the first connecting shaft, thereby generating negative pressure at each strip slot, and removing zinc sulfide particles and odors on the surface of the finished film transferred by the BOPET laser medium, thereby removing impurities and odors.

[0012] As a further preferred embodiment of the present invention, the number of the slotted guide rollers is multiple, and each slotted guide roller is arranged in sequence along the conveying direction of the film, and some of the slotted guide rollers are arranged on the front side of the film, and the remaining slotted guide rollers are arranged on the back side of the film. Usually, the circumference and rotation speed of each slotted guide roller are consistent. By arranging multiple slotted guide rollers on the front and back sides of the film respectively, it can be ensured that the adsorption device can absorb the zinc sulfide particles and odor on the front and back sides of the BOPET laser medium transfer finished film, further improving its effect of removing impurities and odors.

[0013] As a further preferred embodiment of the present invention, the first connecting shaft on each of the slotted guide rollers is connected to the first drive motor through a transmission mechanism; the transmission mechanism includes a driving pulley, an annular synchronous belt and a plurality of driving pulleys, the driving pulley is fixedly mounted on the output shaft of the first drive motor, the number of driving pulleys is the same as that of the slotted guide rollers and they correspond one to one, and each driving pulley is fixedly mounted on the first connecting shaft or the second connecting shaft of the corresponding slotted guide roller; the driving pulley and each driving pulley jointly tighten the annular synchronous belt. When working, the first drive motor drives the driving pulley to rotate, drives each driving pulley to rotate together through the annular synchronous belt, and then drives each slotted guide roller to rotate synchronously together.

[0014] As a further preferred embodiment of the present invention, a static-eliminating brush is provided on one side of the slotted guide roller, and the static-eliminating brush is parallel to the slotted guide roller. When working, the BOPET laser medium transfer finished film passes between the slotted guide roller and the static-eliminating brush, and the static-eliminating brush can eliminate static electricity on the surface of the BOPET laser medium transfer finished film to improve its effect of removing impurities and odors.

[0015] As a preferred embodiment of the present invention, the blowing humidifying and drying device includes a blowing unit, a humidifying unit and a drying unit, which are sequentially arranged along the conveying direction of the film, the blowing unit is used to blow air to the surface of the film, the humidifying unit is used to humidify the surface of the film, and the drying unit is used to dry the surface of the film. During operation, the BOPET laser medium transfer finished film passes through the blowing unit, the humidifying unit and the drying unit in sequence, and the blowing unit first blows air to the surface of the BOPET laser medium transfer finished film to further remove the zinc sulfide particles and odor on the BOPET laser medium transfer finished film; then, the humid air generated by the humidifying unit has a certain viscosity, which can further remove the odor on the surface of the BOPET laser medium transfer finished film, and at the same time will not pollute the surface of the BOPET laser medium transfer finished film; finally, the drying unit dries the water mist on the surface of the BOPET laser medium transfer finished film.

[0016] As a further preferred embodiment of the present invention, the blowing unit includes a first box, a blower and a plurality of first pipes. The first box and the blower are both mounted on the frame. The front and rear sides of the first box are respectively provided with openings. At least one first guide roller for guiding the film is installed in the first box. The top and bottom of the first box are both provided with a plurality of first blowing ports, and each first blowing port is connected to the air outlet of the blower through a corresponding first pipe. When working, the BOPET laser medium transfer finished film enters the inner cavity of the first box from the opening on the front side of the first box, and comes out from the opening on the rear side of the first box under the guidance of each first guide roller. The wind sent by the blower enters the inner cavity of the first box through each first pipe and each first blowing port, and blows the front and back sides of the BOPET laser medium transfer finished film from the upper and lower sides to remove the zinc sulfide particles and odor on the BOPET laser medium transfer finished film.

[0017] As a further preferred embodiment of the present invention, the humidifying unit includes a humidifier, a second box and a plurality of second pipes. The second box and the humidifier are both mounted on the frame. The front and rear sides of the second box are respectively provided with openings. At least one second guide roller for guiding the film is installed in the second box. The top and bottom of the second box are both provided with a plurality of second blowing ports. Each second blowing port is connected to the air outlet of the humidifier through a corresponding second pipe. The humidifier blows humid air into each second blowing port at a preset wind speed. When working, the BOPET laser medium transfer finished film enters the inner cavity of the second box from the opening on the front side of the second box, and comes out from the opening on the rear side of the second box under the guidance of each second guide roller. The humidifier blows humid air to the front and back sides of the BOPET laser medium transfer finished film entering the inner cavity of the second box through each second pipe and each second blowing port. The humidified air has a certain viscosity and can further remove the odor on the front and back sides of the BOPET laser medium transfer finished film, while not polluting the surface of the BOPET laser medium transfer finished film.

[0018] As a further preferred embodiment of the present invention, the drying unit includes a third box, a hot air device and a plurality of third pipes. The third box and the hot air device are both mounted on the frame. The front and rear sides of the third box are respectively provided with openings. At least one third guide roller for guiding the film is installed in the third box. The top and bottom of the third box are both provided with a plurality of third blowing ports, and each third blowing port is connected to the air outlet of the hot air device through a corresponding third pipe. During operation, the BOPET laser medium transfer finished film enters the inner cavity of the third box from the opening on the front side of the third box, and comes out from the opening on the rear side of the third box under the guidance of each third guide roller. At the same time, the hot air device inputs hot air into the inner cavity of the third box through each third pipe and each third blowing port, and then blows hot air to the front and back of the BOPET laser medium transfer finished film, and dries the front and back of the BOPET laser medium transfer finished film from the upper and lower sides. Since the humidification unit uses humidified air to remove odors, there is only a small amount of water mist on the surface of the BOPET laser media transfer finished film when it enters the third box, so it only needs a lower drying temperature to dry it (such as 70-80℃ (conventional water washing and drying temperature is above 100℃)), and the conveying speed of the BOPET laser media transfer finished film can be increased to more than 130 meters / minute (conventional 80-90 meters / minute).

[0019] The hot air device generally includes a blower and an electric heater, wherein the electric heater is installed at the air outlet of the blower. The air output by the blower is heated by the electric heater and then enters the third pipe.

[0020] The dry air, moist air and hot air blown in are generally discharged through the side walls of each box and are collected and processed.

[0021] As a preferred embodiment of the present invention, the film slitting machine also includes a film shaking mechanism, which is arranged between the adsorption device and the blowing, humidifying and drying device. The film shaking mechanism includes an eccentric shaft, a second drive motor, a cam guide roller, a guide rail, a sliding seat, a shaking guide roller and a gas spring. The second drive motor and the guide rail are both installed on the frame. The eccentric shaft can be rotatably installed on the frame and is drivingly connected to the output shaft of the second drive motor. The cam guide roller is fixedly installed on the eccentric shaft. The sliding seat is installed on the guide rail and slidingly cooperates with the guide rail. The gas spring is arranged between the sliding seat and the frame and is parallel to the guide rail. One end of the gas spring is connected to the sliding seat, and the other end of the gas spring is connected to the frame. The shaking guide roller can be rotatably installed on the sliding seat, and along the conveying direction of the film, the shaking guide roller is behind the cam guide roller. During operation, the second drive motor drives the eccentric shaft to rotate continuously, driving the cam guide roller to rotate eccentrically, causing the length of the film between the cam guide roller and the film winding device to change. At this time, the shaking guide roller and the sliding seat move back and forth along the guide rail under the joint action of the gas spring and the film, causing the film to shake regularly, thereby better removing foreign particles on the film.

[0022] Usually, a plurality of film guide rollers are provided between the film unwinding device and the film winding device, which can guide and tension the film.

[0023] Compared with the prior art, the present invention has the following advantages: This production process of laser media transfer paper can produce laser media transfer paper without impurities and low odor residue. It can not only solve the problem of incomplete cleaning of zinc sulfide particles in conventional water washing processes, but also prevent the occurrence of defects such as adhesion, oxidation, missing holographic images, whitening, and hollowness due to poor drying. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of laser medium transfer paper prepared by the production process of the preferred embodiment of the present invention.

[0025] Figure 2 It is a structural schematic diagram of a film slitting machine in the production process of a preferred embodiment of the present invention.

[0026] Figure 3 yes Figure 2 The diagram shows the connection and coordination between the slotted guide roller, the suction pipe and the centrifugal fan in the film slitting machine. DETAILED DESCRIPTION

[0027] like Figure 1-Figure 3 As shown, the production process of this laser medium transfer paper includes the following steps: S1, coating a water-based polyurethane laser transfer coating on the surface of the BOPET film 1 using a coating machine to form a laser transfer coating 2; S2, using a laser holographic embossing machine to holographically emboss the laser transfer coating 2 to form a holographic embossing layer 20, thereby obtaining a BOPET laser embossing film 100; S3, the BOPET laser molded film 100 obtained in S2 is subjected to a zinc sulfide dielectric layer 3 by evaporation on a vacuum coating machine to obtain a BOPET laser dielectric transfer film 200; S4, removing impurities, removing odors and trimming the BOPET laser medium transfer film 200 obtained in S3 on a film slitting machine to obtain a BOPET laser medium transfer finished product film 300; The film slitting machine used includes a frame 51, a film unwinding device 52, an adsorption device 53, a blowing humidification and drying device 54, a trimming device 55, a film shaking mechanism 56 and a film winding device 57; the film unwinding device 52, the adsorption device 53, the film shaking mechanism 56, the blowing humidification and drying device 54, the trimming device 55 and the film winding device 57 are all installed on the frame 51 and arranged in sequence along the conveying direction of the film; the adsorption device 53 can adsorb impurities and odors on the surface of the film , so as to remove impurities and odors; the blowing humidifying and drying device 54 includes a blowing unit 541, a humidifying unit 542 and a drying unit 543, and the blowing unit 541, the humidifying unit 542 and the drying unit 543 are arranged in sequence along the conveying direction of the film, the blowing unit 541 is used to blow the surface of the film, the humidifying unit 542 is used to humidify the surface of the film, and the drying unit 543 is used to dry the surface of the film; the trimming device 55 can trim the film; S5. Compound, dry and peel off the BOPET laser medium transfer finished film 300 obtained in S4 on a wet compounding machine, so that the laser transfer coating 2 of the BOPET laser medium transfer finished film 300 is compounded on the paper 500 through the adhesive layer 400, thereby obtaining laser medium transfer paper.

[0028] In the above production process, in step S1, the laser transfer coating 2 adopts water-based polyurethane laser transfer coating, which can make the BOPET film 1 free of organic solvent residues, and because the surface tension of the laser transfer coating 2 is high, the laser transfer coating 2 does not need to undergo secondary corona treatment in step S3, and can be directly used for vacuum coating machine to evaporate zinc sulfide medium layer 3, and when the laser transfer coating 2 is transferred onto the paper, no varnish layer is required, which reduces the production cost and improves the glossiness of the laser information; in step S4, the film slitting machine can automatically complete the process of removing impurities, removing odors and trimming the BOPET laser medium transfer film 200, which greatly reduces the defects such as dirty spots and embossing caused by zinc sulfide particles in the wet laminating machine in step S5, and at the same time can reduce the process flow and process loss of the laser medium film.

[0029] In this embodiment, the thickness of the BOPET film 1 used in step S1 is 12 um-14 um.

[0030] In this embodiment, the coating machine used in step S1 is a coating machine with an anilox roller and a scraper, and the coating anilox roller used is a 200# steel plate, and its coating dry weight is 1.1-1.3 g / ㎡.

[0031] In this embodiment, the laser holographic embossing machine used in step S2 is one of a single-plate holographic embossing machine, a single-plate positioning holographic embossing machine and a seamless holographic embossing machine.

[0032] In this embodiment, the adsorption device 53 includes a first drive motor 531, a centrifugal fan 532, a plurality of slotted guide rollers 533 and a plurality of suction pipes 534, the first drive motor 531 and the centrifugal fan 532 are both mounted on the frame 51; the slotted guide rollers 533 are arranged in sequence along the conveying direction of the film, some of the slotted guide rollers 533 are arranged on the front side of the film, and the remaining slotted guide rollers 533 are arranged on the back side of the film; the slotted guide roller 533 includes a roller body 5331, a first connecting shaft 5332 and a second connecting shaft 5333, the first connecting shaft 5332 and the second connecting shaft 5333 are respectively connected to the centers of the two end surfaces of the roller body 5331, the first connecting shaft 5332 and the second connecting shaft 5333 can be rotatably mounted on the frame 51 and the axes of the two coincide; the roller body 5331 has an air guide cavity (not shown in the figure) inside, and the outer surface of the roller body 5331 The circumferential surface is provided with a plurality of strip grooves 53310 arranged in sequence along its outer circumference, and the extension direction of the strip grooves 53310 is consistent with the axial direction of the roller body 5331, and each strip groove 53310 is connected to the air guide cavity and corresponds to the surface position of the film; the first connecting shaft 5332 is provided with an air guide channel (not shown in the figure) connected to the air guide cavity; the first connecting shaft 5332 on each slotted guide roller 533 is connected to the first drive motor 531 through a transmission mechanism 535; the number of suction pipes 534 is the same as that of the slotted guide rollers 533 and they correspond one to one, and the suction pipes 534 are arranged between the corresponding slotted guide rollers 533 and the centrifugal fan 532, one end of the suction pipe 534 is connected to the end of the first connecting shaft 5332 away from the roller body 5331 through a rotating joint 535, and the other end of the suction pipe 534 is connected to the air inlet of the centrifugal fan 532. Specifically, the circumference and rotation speed of each slotted guide roller 533 are consistent, the longitudinal width of the strip slot 53310 is 1-2 mm, and a strip slot 53310 is provided every 40-50 mm in the circumferential direction of the slotted guide roller 533, and the length of the strip slot 53310 is greater than the transverse width of the film. By arranging multiple slotted guide rollers 533 on the front and back sides of the film, it can be ensured that the adsorption device 53 can absorb the zinc sulfide particles and odor on the front and back sides of the BOPET laser medium transfer film 200, further improving its effect of removing impurities and odors.

[0033] The transmission mechanism 535 includes a driving pulley 5351, an annular synchronous belt 5352 and a plurality of driving pulleys 5353. The driving pulley 5351 is fixedly mounted on the output shaft of the first driving motor 531. The number of driving pulleys 5353 is the same as that of the slotted guide rollers 533 and they correspond one to one. Each driving pulley 5353 is fixedly mounted on the first connecting shaft 5332 of the corresponding slotted guide roller 533. The driving pulley 5351 and each driving pulley 5353 jointly tighten the annular synchronous belt 5352. When working, the first driving motor 531 drives the driving pulley 5351 to rotate, and drives each driving pulley 5353 to rotate together through the annular synchronous belt 5352, and then drives each slotted guide roller 533 to rotate synchronously together.

[0034] In this embodiment, the blowing unit 541 includes a first box body 5411, a hair dryer 5412 and a plurality of first pipes 5413. The first box body 5411 and the hair dryer 5412 are both installed on the frame 51. The front and rear sides of the first box body 5411 are respectively provided with openings. At least one first guide roller 5414 for guiding the film is installed in the first box body 5411. The top and bottom of the first box body 5411 are both provided with a plurality of first blowing ports 54110. Each first blowing port 54110 is respectively connected to the air outlet of the hair dryer 5412 through the corresponding first pipe 5413. During operation, the BOPET laser medium transfer film 200 enters the inner cavity of the first box body 5411 from the opening on the front side of the first box body 5411, and comes out from the opening on the rear side of the first box body 5411 under the guidance of each first guide roller 5414; the hair dryer 5412 enters the inner cavity of the first box body 5411 through each first pipe 5413 and each first blowing port 54110, and blows air to the front and back sides of the BOPET laser medium transfer film 200 from the upper and lower sides respectively, so as to remove zinc sulfide particles and odor on the BOPET laser medium transfer film 200.

[0035] In this embodiment, the humidifying unit 542 includes a humidifier 5421, a second box body 5422 and a plurality of second pipes 5423. The second box body 5422 and the humidifier 5421 are both mounted on the frame 51. The front and rear sides of the second box body 5422 are respectively provided with openings. At least one second guide roller 5424 for guiding the film is installed in the second box body 5422. The top and bottom of the second box body 5422 are both provided with a plurality of second air outlets 54220. Each second air outlet 54220 is respectively connected to the air outlet of the humidifier 5421 through a corresponding second pipe 5423. The humidifier 5421 blows humid air into each second air outlet 54220 at a preset wind speed. During operation, the BOPET laser medium transfer film 200 enters the inner cavity of the second box body 5422 from the opening on the front side of the second box body 5422, and comes out from the opening on the rear side of the second box body 5422 under the guidance of each second guide roller 5424; the humidifier 5421 blows humid air to the front and back sides of the BOPET laser medium transfer film 200 entering the inner cavity of the second box body 5422 through each second pipe 5423 and each second blowing port 54220. The humid air has a certain viscosity, which can further take away the odor on the front and back sides of the BOPET laser medium transfer film 200 without polluting the surface of the BOPET laser medium transfer film 200.

[0036] In this embodiment, the drying unit 543 includes a third box body 5431, a hot air device 5432 and a plurality of third pipes 5433. The third box body 5431 and the hot air device 5432 are both installed on a frame. The front and rear sides of the third box body 5431 are respectively provided with openings. At least one third guide roller 5434 for guiding the film is installed in the third box body 5431. The top and bottom of the third box body 5431 are both provided with a plurality of third air outlets 54310. Each third air outlet 54310 is respectively connected to the air outlet of the hot air device 5432 through a corresponding third pipe 5433. During operation, the BOPET laser medium transfer film 200 enters the inner cavity of the third box 5431 from the opening on the front side of the third box 5431, and comes out from the opening on the rear side of the third box 5431 under the guidance of each third guide roller 5434; at the same time, the hot air device 5432 inputs hot air into the inner cavity of the third box 5431 through each third pipe 5433 and each third blowing port 54310, and then blows hot air to the front and back sides of the BOPET laser medium transfer film 200, and dries the front and back sides of the BOPET laser medium transfer film 200 from the upper and lower sides respectively. Since the humidifying unit 542 uses humidified air to remove odors, there is only a small amount of water mist on the surface of the BOPET laser medium transfer film 200 when it enters the third box, so it only needs a lower drying temperature to be dried (such as 70-80°C (conventional water washing and drying temperature is above 100°C)), and the conveying speed of the BOPET laser medium transfer film 200 can be increased to more than 130 m / min (conventional 80-90 m / min).

[0037] In this embodiment, the film shaking mechanism 56 includes an eccentric shaft 561, a second drive motor (not shown in the figure), a cam guide roller 563, a guide rail 564, a sliding seat 565, a shaking guide roller 566 and a gas spring 567. The second drive motor and the guide rail 564 are both installed on the frame 51. The eccentric shaft 561 can be rotatably installed on the frame 51 and is drivingly connected to the output shaft of the second drive motor. The cam guide roller 563 is fixedly installed on the eccentric shaft 561. The sliding seat 565 is installed on the guide rail 564 and slides with the guide rail 564. The gas spring 567 is arranged between the sliding seat 565 and the frame 51 and is parallel to the guide rail 564. One end of the gas spring 567 is connected to the sliding seat 565, and the other end of the gas spring 567 is connected to the frame 51; the shaking guide roller 566 can be rotatably installed on the sliding seat 565. Along the conveying direction of the film, the shaking guide roller 566 is located behind the cam guide roller 563. During operation, the second drive motor drives the eccentric shaft 561 to rotate continuously, driving the cam guide roller 563 to rotate eccentrically, causing the length of the film between the cam guide roller 563 and the film winding device 57 to change. At this time, the shaking guide roller 566 and the sliding seat 565 move back and forth along the guide rail 564 under the joint action of the gas spring 567 and the film, causing the film to shake regularly, thereby better removing foreign particles on the film.

[0038] In this embodiment, a plurality of film guide rollers 58 are provided between the film unwinding device 52 and the film winding device 57 to guide and tension the film.

[0039] The following is a brief description of the working principle of the film slitting machine: During operation, the film roll formed by the BOPET laser medium transfer film 200 obtained in step S3 can be installed on the film unwinding device 52; the BOPET laser medium transfer film 200 released by the film unwinding device 52 passes through the adsorption device 53, the blowing humidification and drying device 54 and the trimming device 55 in sequence under the drive of the film winding device 57, and is wound up at the film winding device 57; when the BOPET laser medium transfer film 200 passes through the adsorption device 53, each slotted guide roller 533 of the adsorption device 53 is driven by the first driving motor 531 to continuously rotate, and at the same time, the centrifugal fan 532 sucks air from the air guide cavity inside the roller body 5331 through the air suction pipe 534 and the air guide channel of the first connecting shaft 5332, and generates negative pressure at each strip slot 53310, so as to remove the zinc sulfide particles and odor on the surface of the BOPET laser medium transfer film 200, thereby achieving the first impurity removal and odor removal; when the BOPET laser medium transfer film 200 passes through the adsorption device 53, the air guide roller 533 of the adsorption device 53 is driven by the first driving motor 531 to continuously rotate, and at the same time, the centrifugal fan 532 sucks air from the air guide cavity inside the roller body 5331 through the air suction pipe 534 and the air guide channel of the first connecting shaft 5332, and generates negative pressure at each strip slot 53310, so as to remove the zinc sulfide particles and odor on the surface of the BOPET laser medium transfer film 200, thereby achieving the first impurity removal and odor removal; When passing through the blowing humidifying and drying device 54, the blowing unit 541 first blows the surface of the BOPET laser medium transfer film 200 to further remove the zinc sulfide particles and odor on the BOPET laser medium transfer film 200; then, the humid air generated by the humidifying unit 542 has a certain viscosity, which can further remove the odor on the surface of the BOPET laser medium transfer film 200 without polluting the surface of the BOPET laser medium transfer film 200; finally, the drying unit 543 dries the water mist on the surface of the BOPET laser medium transfer film 200 to achieve the second impurity removal and odor removal; when the BOPET laser medium transfer film 200 passes through the trimming device 55, the trimming device 55 cuts the edge of the BOPET laser medium transfer film 200 to achieve trimming treatment; finally, the obtained BOPET laser medium transfer finished film 300 is rolled up by the film rolling device 57 and then sent to the subsequent process for processing.

[0040] In addition, it should be noted that the names of the various parts of the specific embodiments described in this specification may be different, and any equivalent or simple changes made based on the structure, features and principles of the patent concept of the present invention are included in the protection scope of the patent of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A production process for laser medium transfer paper, characterized in that The steps include: S1. coating the surface of the BOPET film with a water-based polyurethane laser transfer coating using a coating machine to form a laser transfer coating; S2, using a laser holographic embossing machine to perform laser holographic embossing on the laser transfer coating to form a holographic embossing layer, thereby obtaining a BOPET laser embossing film; S3, evaporating a zinc sulfide dielectric layer on the BOPET laser molded film obtained in S2 on a vacuum coating machine to obtain a BOPET laser dielectric transfer film; S4, removing impurities, removing odors and trimming the BOPET laser medium transfer film obtained in S3 on a film slitting machine to obtain a BOPET laser medium transfer finished product film; The film slitting machine used includes a frame, a film unwinding device, an adsorption device, a blowing humidification and drying device, a trimming device and a film winding device; the film unwinding device, the adsorption device, the blowing humidification and drying device, the trimming device and the film winding device are all installed on the frame and arranged in sequence along the conveying direction of the film; the adsorption device can adsorb impurities and odors on the surface of the film, so as to remove impurities and odors; the blowing humidification and drying device can blow, humidify and dry the surface of the film, so as to remove impurities and odors; the trimming device can trim the film; S5, compounding, drying and peeling the BOPET laser medium transfer finished film obtained in S4 on a wet compounding machine, so that the laser transfer coating of the BOPET laser medium transfer finished film is compounded on the paper through the adhesive layer to make laser medium transfer paper.

2. The production process of laser medium transfer paper according to claim 1, characterized in that: The thickness of the BOPET film used in step S1 is 12um-14um; the laser holographic embossing machine used in step S2 is one of a single-plate holographic embossing machine, a single-plate positioning holographic embossing machine and a seamless holographic embossing machine.

3. The production process of laser medium transfer paper according to claim 1, characterized in that: The adsorption device comprises a first driving motor, a centrifugal fan, at least one slotted guide roller and at least one suction pipe, the first driving motor and the centrifugal fan are both mounted on a frame, the slotted guide roller is arranged on one side of the film, the slotted guide roller comprises a roller body, a first connecting shaft and a second connecting shaft, the first connecting shaft and the second connecting shaft are respectively connected at the center of the two end surfaces of the roller body, the first connecting shaft and the second connecting shaft can be rotatably mounted on the frame and the axes of the two coincide, the first connecting shaft or the second connecting shaft is drivingly connected to the power output shaft of the first driving motor; the roller body has an air guide cavity inside, the outer peripheral surface of the roller body is provided with a plurality of strip grooves arranged in sequence along its outer circumference, the extension direction of the strip grooves is consistent with the axial direction of the roller body, each strip groove is connected to the air guide cavity and corresponds to the surface position of the film; the first connecting shaft is provided with an air guide channel connected to the air guide cavity; the suction pipe is arranged between the corresponding slotted guide roller and the centrifugal fan, one end of the suction pipe is connected to the end of the first connecting shaft away from the roller body through a rotating joint, and the other end of the suction pipe is connected to the air inlet of the centrifugal fan.

4. The production process of laser medium transfer paper according to claim 3, characterized in that: There are multiple slotted guide rollers, which are arranged in sequence along the conveying direction of the film. Some of the slotted guide rollers are arranged on the front side of the film, and the remaining slotted guide rollers are arranged on the back side of the film.

5. The production process of laser medium transfer paper according to claim 4, characterized in that: The first connecting shaft on each of the slotted guide rollers is connected to the first drive motor through a transmission mechanism; the transmission mechanism includes a driving pulley, an annular synchronous belt and multiple transmission pulleys, the driving pulley is fixedly mounted on the output shaft of the first drive motor, the number of transmission pulleys is the same as that of the slotted guide rollers and they correspond one to one, and each transmission pulley is respectively fixedly mounted on the first connecting shaft or the second connecting shaft of the corresponding slotted guide roller; the driving pulley and each transmission pulley jointly tension the annular synchronous belt.

6. The production process of laser medium transfer paper according to claim 3, characterized in that: A static-eliminating brush is arranged on one side of the slotted guide roller, and the static-eliminating brush is parallel to the slotted guide roller.

7. The production process of laser medium transfer paper according to claim 1, characterized in that: The blowing, humidifying and drying device includes a blowing unit, a humidifying unit and a drying unit, which are arranged in sequence along the conveying direction of the film. The blowing unit is used to blow air to the surface of the film, the humidifying unit is used to humidify the surface of the film, and the drying unit is used to dry the surface of the film.

8. The production process of laser medium transfer paper according to claim 7, characterized in that: The blowing unit comprises a first box, a hair dryer and a plurality of first pipes, the first box and the hair dryer are both mounted on the frame, the front and rear sides of the first box are respectively provided with openings, and at least one first guide roller for guiding the film is installed in the first box; a plurality of first blowing ports are both provided at the top and bottom of the first box, and each first blowing port is connected to the air outlet of the hair dryer through a corresponding first pipe; the humidifying unit comprises a humidifier, a second box and a plurality of second pipes, the second box and the humidifier are both mounted on the frame, the front and rear sides of the second box are respectively provided with openings, and at least one first guide roller for guiding the film is installed in the second box two guide rollers; a plurality of second air blowing ports are arranged on the top and bottom of the second box body, and each second air blowing port is connected to the air outlet of the humidifier through a corresponding second pipe, and the humidifier blows humid air into each second air blowing port at a preset wind speed; the drying unit comprises a third box body, a hot air device and a plurality of third pipes, the third box body and the hot air device are both installed on the frame, the front and rear sides of the third box body are respectively provided with openings, and at least one third guide roller for guiding the film is installed in the third box body; a plurality of third air blowing ports are arranged on the top and bottom of the third box body, and each third air blowing port is connected to the air outlet of the hot air device through a corresponding third pipe.

9. The production process of laser medium transfer paper according to claim 1, characterized in that: The film slitting machine also includes a film shaking mechanism, which is arranged between the adsorption device and the blowing, humidifying and drying device. The film shaking mechanism includes an eccentric shaft, a second drive motor, a cam guide roller, a guide rail, a sliding seat, a shaking guide roller and a gas spring. The second drive motor and the guide rail are both installed on the frame. The eccentric shaft can be rotatably installed on the frame and is drivingly connected to the output shaft of the second drive motor. The cam guide roller is fixedly installed on the eccentric shaft. The sliding seat is installed on the guide rail and slidingly cooperates with the guide rail. The gas spring is arranged between the sliding seat and the frame and is parallel to the guide rail. One end of the gas spring is connected to the sliding seat, and the other end of the gas spring is connected to the frame; the shaking guide roller can be rotatably installed on the sliding seat, and along the conveying direction of the film, the shaking guide roller is behind the cam guide roller.

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