Laser film water-based coating printing device and process thereof

Abstract

This application relates to a laser film water-based coating printing apparatus and its process, belonging to the technical field of printing and coating equipment. The apparatus includes a vertical frame, a horizontal frame, a feed roller, an output roller, a cover, and a printing unit. A scraping unit is located downstream of the printing unit. The scraping unit is connected to a rectangular cover via an adjustment structure. A hot scraping structure is slidably installed inside the rectangular cover. The hot scraping structure includes a carrier chamber driven to rise and fall by a first motor and a lead screw. The carrier chamber contains two actuating components driven by a second motor and a worm gear. The actuating components convert the rotational motion into the lateral reciprocating motion of the scraper frame through a pushing component. The scraper frame has a gas flow channel inside and a hemispherical protrusion array on its bottom surface. External hot air is blown out through the gaps between the hemispherical protrusions via the gas flow channel. The process includes coating, scraping posture adjustment, hot air-assisted reciprocating disturbance, and drying and winding. This application, through the combined action of non-contact hot air disturbance and reciprocating shearing, can eliminate longitudinal lines in the coating, prevent material adhesion, and promote surface leveling and shaping.

Description

Technical Field

[0001] This application relates to the technical field of printing and coating equipment, and in particular to a laser film water-based coating printing apparatus and process. Background Technology

[0002] Laser film, a special optical thin film material with rainbow dynamic visual effects, has been widely used in high-end packaging anti-counterfeiting, printed surface decoration and functional coating. The production of laser film usually requires uniformly coating a layer of water-based coating material on the surface of a substrate such as polyester or polypropylene. After subsequent molding or drying, the coating forms a specific micro-nano structure, thereby giving the film a unique optical diffraction effect.

[0003] Currently, Chinese patent application number CN202220687039.5 discloses a color laser film water-based coating printing device, including a support plate, with fixed plates fixedly connected to the front and rear sides of the top of the support plate. A flat plate driven by a hydraulic cylinder is provided on the top left side of the fixed plate, and a cooling box structure is provided on the top right side. The device uses the flat plate on the top left side of the fixed plate, which is lowered by the operator manually rotating the adjustment knob to adapt to the size and thickness of the laser film of different thicknesses, so as to flatten it. The cooling box structure on the far right side allows the laser film surface to be cooled after printing and coating before discharge, preventing paint contamination and unevenness.

[0004] However, the flattening plate of the existing printing equipment uses a contact-type flattening method, which can only eliminate macroscopic wrinkles of the substrate. It lacks an effective means to eliminate longitudinal stripes on the surface of the wet coating caused by the shearing of the doctor blade after coating. Furthermore, there is no intermediate processing step for the wet coating between the printing box and the cooling box. Direct cooling of the undried coating can easily produce drying defects such as orange peel texture and pinholes. In addition, the cold air cooling method is only suitable for ink curing. It is not easy to provide thermal energy to promote leveling for water-based coatings, and direct blowing of cold air can easily cause the coating to flow and deform. Summary of the Invention

[0005] The purpose of this application is to provide a laser film water-based coating printing apparatus and process to solve the problems in the prior art.

[0006] In a first aspect, the laser film water-based coating printing apparatus provided in this application adopts the following technical solution: it includes a vertical frame, a horizontal frame, a feed roller, an output roller, a cover, a door, a printing unit, and a scraping unit. The horizontal frame is horizontally fixed inside the lower middle side of the vertical frame. The feed roller is installed on the top right side of the horizontal frame, and the output roller is installed on the top left side of the horizontal frame. The cover is embedded and fixed in the upper part of the inner side of the vertical frame, and the door is hinged on the left and right sides of the front part of the cover. The printing unit is arranged inside the cover near the feed roller. A scraping unit is provided on the side of the printing unit away from the feed roller, and the upper left part of the scraping unit is fixed to the cover. The scraping unit includes an adjustment structure that is fixed to the cover on the top rear side. A rectangular frame is connected to the right side of the adjustment structure. A horizontal plate is fixed to the top side of the rectangular frame. A hot scraping structure is provided through the inner side of the horizontal plate. The hot scraping structure is slidably connected to the inner side of the rectangular frame. The rear side of the hot scraping structure is connected to an external hot air source through a corrugated pipe.

[0007] By adopting the above technical solution, a scraping unit integrating the adjustment structure and the hot scraping structure is set downstream of the printing unit. This enables non-contact disturbance, smoothing and pre-drying operations to be carried out on the wet coating, which helps to eliminate longitudinal stripes of the coating and prevent scraping material accumulation.

[0008] Preferably, the cross frame is provided with multiple guide rollers, one on each of the left and right sides below the scraping unit, and at least three equidistantly arranged below the printing unit.

[0009] By adopting the above technical solution, the guide rollers are arranged at equal intervals below the printing unit to ensure the flatness of the film surface in the coating area, while the symmetrical arrangement on both sides below the scraping unit can maintain the horizontal state of the film surface in the scraping operation area, thereby improving the uniformity of the coating process.

[0010] Preferably, the adjustment structure includes a fixing plate fixed to the rear side of the cover base. A support slot is integrally fixed to the front bottom side of the fixing plate. The right bottom side of the fixing plate is hinged to the rectangular frame cover via a hinge. A support frame is provided on the left side of the hinge. The support frame is fixedly connected to the bottom of the fixing plate in an inclined shape. A fastening bolt is provided through the bottom of the support frame. When the hot scraping structure is at the bottom, the fastening bolt is used to lock the rectangular frame cover to the bottom of the support frame. An arc-shaped groove is opened on the right side inside the support slot. A locking bolt is provided through the inner side of the arc-shaped groove. It is used to limit and guide the rectangular frame cover to be raised or lowered. After the locking bolt is tightened, it is used to fix the position of the rectangular frame cover and the hot scraping structure.

[0011] By adopting the above technical solution, and utilizing the combination of hinges, supports and arc grooves, the overall tilt angle and working height of the rectangular frame and its internal hot scraping structure can be flexibly adjusted and reliably locked. This facilitates equipment cleaning and maintenance, and can also adapt to the gap requirements of different coating processes.

[0012] Preferably, the hot scraping structure includes a carrier chamber that slides longitudinally within the lower middle side of a rectangular frame. An internally threaded block is embedded on each of the left and right sides of the inner wall of the carrier chamber, and a lead screw is threaded into each of the two internally threaded blocks. A first motor is connected to the top of each lead screw, and the two first motors are respectively fastened to the left and right sides of the top of a horizontal plate. Both lead screws rotate through the inner side of the horizontal plate. A second motor is locked and fixed to the upper middle side of the top of the carrier chamber. A worm gear is connected to the front output end of the second motor, and the front part of the worm gear is inserted and rotates inside a support block. The rear top of the support block is fixed to the carrier chamber. A worm wheel meshes with the bottom side of the worm gear, and the worm wheel rotates through the inner side of a bearing seat. The rear part of the bearing seat is fastened to the carrier chamber. The left and right ends of the worm wheel are respectively connected to a first actuating component and a second actuating component. The rear sides of both the first actuating component and the second actuating component are connected to an external hot air source end through a bellows.

[0013] By adopting the above technical solution, the first motor, in conjunction with the lead screw, can precisely control the vertical working position of the container, while the second motor drives the two moving components simultaneously through the worm gear pair, ensuring the synchronicity of power transmission and the adjustability of the reciprocating motion frequency.

[0014] Preferably, the first action component and the second action component have the same structure and size, and the first action component and the second action component are respectively disposed through the left and right sides inside the cargo compartment.

[0015] By adopting the above technical solution, the symmetrical and identical motion components can ensure that the scraper frame is subjected to balanced force and moves smoothly during the transverse reciprocating motion, thereby improving the uniformity of the coating surface treatment.

[0016] Preferably, the first actuation component includes a support frame fixed to the rear side of the carrier, a pushing component connected to the front side of the carrier, a hot air chamber installed inside the pushing component, and the rear side of the hot air chamber connected to an external hot air source end through a corrugated pipe. A connecting pipe is fixedly connected to the bottom of the hot air chamber, and the connecting pipe slides through the inner side of the bottom of the carrier. The bottom of the connecting pipe is connected to a scraper frame. Rollers are rotatably connected to both sides of the scraper frame. The rollers on both sides are inserted into and roll inside a guide groove block. The top sides of the two guide groove blocks are fixed to the carrier.

[0017] By adopting the above technical solution, the pushing component transmits power to the hot air chamber and scraper frame. With the linear constraint of the rollers and guide groove blocks, the scraper frame can smoothly perform high-frequency lateral reciprocating motion, while ensuring the follow-up reliability of the hot air transmission pipeline.

[0018] Preferably, a gas flow channel is provided through the inside of the scraper frame, and the top side of the gas flow channel is connected to the pipe. The bottom of the scraper frame is provided with a micro-protrusion array composed of multiple hemispherical protrusions, and the bottom outlet of the gas flow channel is opened in the gap area between the hemispherical protrusions.

[0019] By adopting the above technical solution, hot air is blown out from the air outlet in the gap area of ​​the hemispherical protrusion, which can form a micro air cushion isolation layer between the bottom surface of the scraper frame and the wet coating, effectively reducing the adhesion and accumulation of water-based coatings. At the same time, the spherical flow micro vortex can promote the evaporation of solvents on the coating surface and micro leveling.

[0020] Preferably, the pushing component includes an eccentric rotating rod with one end connected to the worm gear shaft. A guide sleeve is rotatably connected to the side of the eccentric rotating rod away from the worm gear. The guide sleeve is fixedly connected to the side of the first push rod. The rear end of the first push rod is rotatably connected to the support frame, and the front end of the first push rod is rotatably connected to the second push rod. The front side of the second push rod is rotatably connected to the guard frame. A first support rod is rotatably connected to the top of the guard frame away from the second push rod. The rear end of the first support rod is rotatably connected to the second support rod, and the rear side of the second support rod is rotatably connected to the support frame.

[0021] By adopting the above technical solution, the eccentric rotating rod, together with the double rocker mechanism consisting of multiple push rods and support rods, can smoothly convert the rotational motion of the worm gear into the horizontal reciprocating linear motion of the guard frame and the hot air chamber. The structure is compact and has good transmission rigidity.

[0022] Preferably, the first push rod and the second support rod are the same size and length, the second push rod and the first support rod are the same size and length, and the bottom of the protective frame is in sliding contact with the cargo compartment.

[0023] By adopting the above technical solution, the guard frame can always maintain a horizontal posture during reciprocating motion, avoiding additional vibration and wear caused by swaying.

[0024] Secondly, this application provides a laser film water-based coating printing process, using the laser film water-based coating printing apparatus as described above, including the following steps: S1. The laser film substrate roll to be coated is installed at the feed roller, and the laser film substrate is pulled to pass through multiple guide rollers inside the cross frame in sequence, so that the laser film substrate is kept flat under the printing unit, and the preset feeding tension is established and maintained by the output roller. S2. Start the printing unit to uniformly transfer and coat the water-based coating material onto the surface of the continuously moving laser film substrate to form a wet coating layer that has not yet dried. S3. By adjusting the position of the locking bolt of the adjustment structure in the arc groove and the tightening state of the fastening bolt, the rectangular frame cover and the hot scraping structure as a whole swing around the hinge to the preset working angle, and position the bottom of the hot scraping structure at a suitable non-contact working height above the wet coating. S4. Start the first motor to adjust the load cell to the working height; start the second motor, and through worm gear and worm wheel transmission, drive the first and second action components to convert the eccentric rotation into the horizontal reciprocating linear motion of the scraper frame along the material feed direction; at the same time, the external hot air source supplies air into the scraper frame, and the hot air is blown from the air outlet in the gap area of ​​the bottom hemispherical protrusion to the wet coating surface, and the coating stripes are eliminated and the surface is accelerated by reciprocating shearing and spherical flow micro vortex. S5. After the disturbance and pre-drying treatment in step S4, the laser film continues to move forward. After passing through the discharge roller, it is fully dried by hot air in the drying unit to completely cure the water-based coating and firmly bond it with the laser film substrate. Then, the completely dried laser film is rolled up to complete the entire printing process of the laser film water-based coating.

[0025] By adopting the above technical solution, the process first passes the wet coating through the non-contact hot air disturbance and reciprocating shearing treatment of the scraping unit, and then enters the drying unit to complete the curing. The whole process can effectively eliminate surface stripe defects, suppress the generation of orange peel texture and pinholes, and finally obtain a laser film product with uniform surface optical effect.

[0026] In summary, this application includes the following beneficial technical effects: 1. This application achieves an integrated operation of non-contact agitation and pre-drying of wet coatings by setting up a combination mechanism of adjustment structure and hot scraping structure; wherein, the adjustment structure utilizes the cooperation of arc groove and locking bolt and hinge connection, so that the rectangular frame cover together with the hot scraping structure can flexibly adjust the working angle and suspension height relative to the material feeding plane within a wide range, which not only facilitates equipment cleaning and maintenance, but also allows for precise setting of working gap according to different coating thicknesses and process requirements, thereby enhancing the adaptability and ease of operation of the device. 2. In the hot scraping structure, this application employs a double rocker mechanism consisting of an eccentric rotating rod, a first push rod, a second push rod, a first support rod, and a second support rod as the pushing component. This smoothly converts the rotational motion of the second motor into a high-frequency reciprocating linear motion of the scraper frame along the transverse direction of the material feed. Simultaneously, the bottom surface of the scraper frame is provided with a micro-protrusion array consisting of multiple hemispherical protrusions. An external hot air source blows hot air evenly out through the air outlet in the gap area between the hemispherical protrusions via a gas flow channel. The hot air generates a spherical micro-vortex effect around the surface of the hemispherical protrusions. Combined with the transverse reciprocating motion of the scraper frame, this applies a uniform and stable pulsating air pressure shearing action to the wet coating surface, effectively eliminating the longitudinal coating streaks that are easily generated by traditional fixed scrapers, and improving the uniformity and consistency of the optical effect on the laser film surface. 3. This application constructs a gas flow channel inside the scraper frame and introduces a controllable hot gas source, so that during the reciprocating motion of the scraper frame, there is always a micro air cushion isolation layer formed by hot gas between its bottom and the wet coating. This air cushion significantly reduces the tendency of water-based coating materials to adhere and accumulate on the bottom surface of the scraper frame, reducing the frequency of equipment shutdown for cleaning. At the same time, the mild pre-drying effect formed by the hot air flow on the coating surface can accelerate solvent evaporation and promote micro-leveling of the coating, thereby suppressing the generation of surface defects such as orange peel texture and pinholes during the subsequent main drying process, ensuring the surface quality of the laser film product. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the printing apparatus of this application; Figure 2 This is a schematic diagram of the internal structure of the cover in this application; Figure 3 This is a schematic diagram of the scraping unit of this application; Figure 4 This is a schematic diagram of the repositioning structure of this application; Figure 5 This is a schematic diagram of the hot scraping structure of this application; Figure 6 This is a schematic diagram of the structure of the first action component of this application; Figure 7 This is a schematic diagram of the structure of the pushing component of this application.

[0028] Explanation of reference numerals in the attached drawings: 1. Vertical frame; 2. Horizontal frame; 21. Guide roller; 3. Feed roller; 4. Discharge roller; 5. Cover; 6. Cover door; 7. Printing unit; 8. Scraping unit; 81. Adjustment structure; 811. Fixing plate; 812. Support frame; 813. Hinge; 814. Support frame; 815. Fastening bolt; 816. Arc groove; 817. Locking bolt; 82. Rectangular frame; 83. Horizontal plate; 84. Hot scraping structure; 841. Loading bin; 842. Lead screw; 843. First motor; 844. Second motor; 845. Worm gear; 846. Support block; 847, worm gear; 848, bearing housing; 849, first actuating assembly; 8410, second actuating assembly; 8491, support frame; 8492, pushing component; 84921, eccentric rotating rod; 84922, guide sleeve; 84923, first push rod; 84924, second push rod; 84925, guard frame; 84926, first support rod; 84927, second support rod; 8493, hot air chamber; 8494, connecting pipe; 8495, scraper frame; 84951, hemispherical protrusion; 8496, roller; 8497, guide groove block. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1 - Appendix Figure 7This application will be described in further detail below.

[0030] Example 1.

[0031] This application provides a laser film aqueous coating printing apparatus, with reference to... Figures 1 to 7 The main support structure includes a vertical frame 1; a horizontal frame 2 is fixedly welded to the lower middle side inside the vertical frame 1; a feed roller 3 is installed on the top right side of the horizontal frame 2; a discharge roller 4 is installed on the top left side of the horizontal frame 2; a cover 5 is embedded and fixed in the upper inner part of the vertical frame 1; the cover 5 is a sealed cover formed by bending sheet metal; the left and right sides of its front are connected by hinges to openable and closable doors 6 for easy internal cleaning and maintenance; a printing unit 7 is set inside the cover 5 near the feed roller 3; the printing unit 7 mainly includes an anilox roller, a back roller and a feeding system, used to transfer water-based coating material to the surface of the substrate.

[0032] A scraping unit 8 is provided on the side of the printing unit 7 away from the feed roller 3 (i.e. downstream along the material feeding direction), and the upper left part of the scraping unit 8 is fixed to the interior of the cover 5; the scraping unit 8 is located above the wet coating and is used to perform non-contact disturbance, smoothing and pre-drying treatment on the freshly applied water-based coating.

[0033] The specific composition of scraping unit 8 is as follows: like Figure 3 , Figure 4 As shown, the scraping unit 8 includes an adjustment structure 81 that is fixed to the cover 5 by screws on the top rear side. A rectangular frame cover 82 is connected to the right side of the adjustment structure 81. The rectangular frame cover 82 is a hollow rectangular metal frame, and a horizontal plate 83 is welded and fixed to the top side inside. A hot scraping structure 84 is provided through the horizontal plate 83, and the hot scraping structure 84 can slide longitudinally along the inner side wall of the rectangular frame cover 82. The rear side of the hot scraping structure 84 is connected to the external hot air source end through a corrugated pipe.

[0034] The main function of the adjustment structure 81 is to adjust the tilt angle and height of the rectangular frame cover 82 and its internal hot scraping structure 84 relative to the material feeding plane. The adjustment structure 81 includes a fixing plate 811 fixed to the cover base 5 on the rear side. A support groove 812 is integrally formed on the front bottom side of the fixing plate 811. The right bottom side of the fixing plate 811 is hinged to the left side wall of the rectangular frame cover 82 via a hinge 813. On the left side of the hinge 813, an inclined support 814 is welded to the bottom of the fixing plate 811. A fastening bolt 815 is provided through the bottom of the support 814. When the hot scraping structure 84 is in the lowest working position, tightening the fastening bolt 815 can fix the side wall of the rectangular frame cover 82 to the bottom of the support 814, thereby fixing the position of the rectangular frame cover 82 and ensuring the stability of the working process.

[0035] An arc-shaped groove 816 is provided on the right side of the support frame 812. A locking bolt 817 is installed through the inner side of the arc-shaped groove 816. The tail of the locking bolt 817 is threaded to the left side wall of the rectangular frame cover 82. When it is necessary to lift the rectangular frame cover 82 for cleaning, the fastening bolt 815 and the locking bolt 817 are loosened, and the rectangular frame cover 82 can be flipped upward around the hinge 813. At this time, the locking bolt 817 slides in the arc-shaped groove 816 to limit and guide. After adjusting to a suitable angle, tightening the locking bolt 817 can fix the spatial position of the rectangular frame cover 82 and the hot scraping structure 84.

[0036] like Figures 5 to 7 As shown, the hot scraping structure 84 includes a carrier 841 that slides longitudinally inside the lower part of the rectangular frame 82. An internally threaded block is embedded and fixed on each of the left and right sides of the inner wall of the carrier 841. Each of the two internally threaded blocks is threadedly connected to a lead screw 842. The top ends of each of the two lead screws 842 are connected to a first motor 843 via a coupling, and the two first motors 843 are respectively fastened to the top left and right sides of the horizontal plate 83 via motor mounts. Both lead screws 842 are rotatably connected to the inner side of the horizontal plate 83 via bearings. Through the synchronous forward and reverse rotation of the two first motors 843, the height position of the carrier 841 within the rectangular frame 82 can be precisely controlled.

[0037] A second motor 844 is fixedly fastened to the upper part of the top of the container 841 by screws. A worm gear 845 is connected to the front output end of the second motor 844. The front end of the worm gear 845 is inserted into and rotates in the inner bearing hole of the support block 846. The rear top of the support block 846 is welded and fixed to the top wall of the container 841. A worm wheel 847 is meshed and driven by the bottom side of the worm gear 845. The worm wheel 847 is rotatably mounted inside the bearing seat 848. The rear part of the bearing seat 848 is fastened to the rear wall of the container 841. Rotating shafts extend from the left and right ends of 47 and are connected to the first actuation component 849 on the left and the second actuation component 8410 on the right. The first actuation component 849 and the second actuation component 8410 have the same structure and size and are symmetrically arranged on the left and right sides inside the carrier 841. The rear sides of the first actuation component 849 and the second actuation component 8410 are connected to the external heat source end (such as the hot air system branch of the printing press or an independent air heater) through high temperature resistant corrugated hoses.

[0038] Taking the first actuation component 849 as an example, its structure is described in detail: The first actuation component 849 includes a support frame 8491 fixed to the rear side of the carrier 841 by screws. A pushing component 8492 for generating horizontal reciprocating motion is connected to the front side of the carrier 841. A hot air chamber 8493 is installed inside the pushing component 8492. The hot air chamber 8493 is a hollow rectangular metal box, and its rear air inlet is connected to an external hot air source end through a corrugated pipe. A rigid pipe 84 is fixedly connected to the bottom of the hot air chamber 8493. 94, and the connecting pipe 8494 slides through and fits inside the opening at the bottom of the container 841; the bottom of the connecting pipe 8494 is welded and fixed to the scraper frame 8495; in order to reduce the frictional resistance of the reciprocating motion and ensure straightness, the left and right sides of the scraper frame 8495 are rotatably connected to rollers 8496 through small shafts, and the rollers 8496 on both sides are inserted into and roll in the C-shaped grooves of the two guide blocks 8497 respectively. The top sides of the two guide blocks 8497 are fixed to the bottom of the container 841 by screws.

[0039] The pushing component 8492 includes an eccentric rotating rod 84921, one end of which is connected to the end shaft of the worm gear 847 via a key. A guide sleeve 84922 is rotatably connected to the end of the eccentric rotating rod 84921 away from the rotation center of the worm gear 847. The side of the guide sleeve 84922 is welded and fixedly connected to the side of the first push rod 84923. The rear end of the first push rod 84923 is rotatably connected to the lower side of the support frame 8491. The front end of the first push rod 84923 is rotatably connected to a second push rod 84924 via a pin. The front side of the second push rod 84924 is rotatably connected to the lower right side of the guard frame 84925. The top of the guard frame 84925 is located away from the second push rod 84924. (i.e., on the left) A first support rod 84926 is rotatably connected, and a second support rod 84927 is rotatably connected to the rear end of the first support rod 84926. The rear side of the second support rod 84927 is rotatably connected to the upper side of the support frame 8491. The first push rod 84923 and the second support rod 84927 are of equal length, and the second push rod 84924 and the first support rod 84926 are of equal length. These four rods form a double rocker mechanism, which enables the protective frame 84925 to always maintain a horizontal posture and move back and forth. The bottom plane of the protective frame 84925 slides in contact with the inner bottom wall of the container 841. The hot air chamber 8493 is fixedly installed in the internal cavity of the protective frame 84925 by bolts.

[0040] The scraper frame 8495 has a sealed gas flow channel inside through deep hole machining or separate welding. The air inlet on the top side of the gas flow channel is connected to the pipe 8494. The bottom surface of the scraper frame 8495 is the working surface. The bottom surface is provided with a micro-protrusion array consisting of multiple hemispherical protrusions 84951 integrally formed or embedded. The height of the spherical crown of the hemispherical protrusion 84951 is preferably 0.5 mm, and the distance between adjacent spherical centers is 2.5 mm. The bottom air outlet of the gas flow channel (e.g., a micro-hole array with a diameter of 0.3 mm) is opened in the recessed gap area between the hemispherical protrusions 84951.

[0041] The printing process based on the above-mentioned device is as follows: S1. Material feeding and tension establishment: The laser film substrate roll to be coated is installed at the feed roller 3, and the film is pulled to pass through multiple guide rollers 21 inside the cross frame 2 in sequence; among them, there are no less than three guide rollers 21 located below the printing unit 7, which are evenly arranged to ensure the flatness of the coating area; one guide roller 21 is distributed on each of the left and right sides below the scraping unit 8 to ensure that the film surface in this area is horizontal. Finally, the film is established and maintained by the discharge roller 4 at the preset feeding tension (usually 50-150N).

[0042] S2. Coating: Start printing unit 7. The anilox roller rotates to transfer the water-based coating material in the material tank to the surface of the laser film substrate, forming a wet coating with uniform thickness but not yet dried.

[0043] S3. Scraping Position Adjustment: According to the coating thickness and process requirements, loosen the locking bolt 817 and the fastening bolt 815, so that the rectangular frame cover 82 swings around the hinge 813, and position the bottom of the hot scraping structure 84 at a suitable non-contact working height above the wet coating (usually the suspension gap is 0.2mm-0.8mm), and then tighten the locking bolt 817 to fix it.

[0044] S4. Hot Gas Assisted Reciprocating Disturbance: The first motor 843 is started, and the lead screw 842 drives the carrier 841 to descend to the finely adjusted working height. Then, the second motor 844 is started, and the worm gear 845 drives the worm wheel 847 to rotate. The eccentric rotating rods 84921 at both ends of the worm wheel 847 rotate accordingly. The eccentric rotating rods 84921 drive the first push rod 84923 to reciprocate through the guide sleeve 84922. In turn, through the second push rod 84924 and the guard frame 84925, the hot gas chamber 8493 and the scraper frame 8495 at the bottom perform high-frequency reciprocating linear motion perpendicular to the material feeding direction (frequency adjustable from 1-8Hz). (Amplitude adjustable from 2-10mm); During this process, an external hot air source (temperature 40-60℃) enters the internal gas flow channel of the scraper frame 8495 through the corrugated pipe, hot air chamber 8493, and pipe 8494, and is finally blown out from the air outlet in the gap area of ​​the bottom hemispherical protrusion 84951; the hot air forms a spherical micro-vortex around the surface of the hemispherical protrusion 84951, applies pulsating air pressure to the wet coating surface, and at the same time performs non-contact airflow shearing on the coating surface by transverse reciprocating motion; it eliminates the longitudinal stripes of the coating, and the hot air also forms an air cushion on the bottom surface of the scraper to prevent material from sticking, and accelerates the evaporation and setting of the solvent on the coating surface.

[0045] S5. Drying and Rewinding: After the S4 treatment, the laser film continues to travel into the drying unit (such as an infrared or hot air oven) at the rear of the cover 5 for thorough drying, so that the water-based coating is completely cured; finally, the dried finished product is rewound externally to complete the entire printing process.

[0046] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A laser film water-based coating printing device, comprising a stand (1), a crossbeam (2) is horizontally fixed inside the lower middle side of the stand (1), a feed roller (3) is installed on the top right side of the crossbeam (2), and a discharge roller (4) is installed on the top left side of the crossbeam (2), a cover (5) is embedded and fixed in the upper inner side of the stand (1), and a cover door (6) is hinged on the left and right sides of the front part of the cover (5), and a printing unit (7) is provided inside the cover (5) on the side close to the feed roller (3); Its features are, The printing unit (7) is provided with a scraping unit (8) on the side away from the feed roller (3), and the upper left part of the scraping unit (8) is fixed to the cover (5). The scraping unit (8) includes an adjustment structure (81) fixed to the cover (5) on the top rear side. A rectangular frame (82) is connected to the right side of the adjustment structure (81). A horizontal plate (83) is horizontally fixed to the top side inside the rectangular frame (82). A hot scraping structure (84) is provided through the inner side of the horizontal plate (83). The hot scraping structure (84) is longitudinally slidably connected to the inner side of the rectangular frame (82). The rear side of the hot scraping structure (84) is connected to the external hot air source end through a corrugated pipe. The hot scraping structure (84) includes a carrier (841) that slides longitudinally inside the lower middle side of a rectangular frame (82). An internally threaded block is embedded on each of the left and right sides of the inner wall of the carrier (841), and a lead screw (842) is threaded into each of the two internally threaded blocks. A first motor (843) is connected to the top of each of the two lead screws (842), and the two first motors (843) are respectively fastened to the top left and right sides of the horizontal plate (83). Both lead screws (842) rotate through the inner side of the horizontal plate (83). A second motor (844) is locked and fixed to the upper middle side of the top of the carrier (841), and the front output end of the second motor (844) is connected to… There is a worm gear (845), and the front part of the worm gear (845) is inserted and rotated inside the support block (846). The top rear side of the support block (846) is fixed to the carrier (841). The bottom side of the worm gear (845) is engaged with a worm wheel (847). The worm wheel (847) rotates through the bearing seat (848), and the rear part of the bearing seat (848) is fastened to the carrier (841). The left and right ends of the worm wheel (847) are respectively connected to the first actuation component (849) and the second actuation component (8410). The rear sides of the first actuation component (849) and the second actuation component (8410) are both connected to the external heat source end through a bellows.

2. The laser film water-based coating printing apparatus according to claim 1, characterized in that: The cross frame (2) is provided with multiple guide rollers (21). There is one guide roller (21) on each of the left and right sides below the scraping unit (8), and there are no less than three guide rollers (21) arranged at equal intervals below the printing unit (7).

3. The laser film water-based coating printing apparatus according to claim 1, characterized in that: The adjustment structure (81) includes a fixing plate (811) fixed to the rear side of the cover (5). A support frame (812) is integrally fixed to the front bottom of the fixing plate (811). The bottom right side of the fixing plate (811) is hinged to the rectangular frame (82) via a hinge (813). A support frame (814) is provided on the left side of the hinge (813). The support frame (814) is fixedly connected to the bottom of the fixing plate (811) in an inclined manner. A fastening bolt is provided through the bottom of the support frame (814). When the hot scraping structure (84) is at the bottom, the fastening bolt (815) is used to lock the rectangular frame (82) to the bottom of the support frame (814). The right side of the support frame (812) is provided with an arc groove (816). A locking bolt (817) is provided through the inner side of the arc groove (816) to limit and guide the rectangular frame (82) to be raised or lowered. After the locking bolt (817) is tightened, it is used to fix the position of the rectangular frame (82) and the hot scraping structure (84).

4. The laser film water-based coating printing apparatus according to claim 1, characterized in that: The first action component (849) and the second action component (8410) have the same structure and size, and the first action component (849) and the second action component (8410) are respectively disposed inside the left and right sides of the compartment (841).

5. The laser film water-based coating printing apparatus according to claim 1, characterized in that: The first action component (849) includes a support frame (8491) fixed to the rear side of the container (841). A pushing component (8492) is connected to the front side of the container (841). A hot air chamber (8493) is installed inside the pushing component (8492). The rear side of the hot air chamber (8493) is connected to an external hot air source through a corrugated pipe. A connecting pipe (8494) is fixedly connected to the bottom of the hot air chamber (8493). The connecting pipe (8494) slides through the inner side of the bottom of the container (841). The bottom of the connecting pipe (8494) is connected to a scraper frame (8495). Rollers (8496) are rotatably connected to both sides of the scraper frame (8495). The rollers (8496) on both sides are inserted into and roll inside a guide groove block (8497). The top sides of the two guide groove blocks (8497) are fixed to the container (841).

6. The laser film water-based coating printing apparatus according to claim 5, characterized in that: The scraper frame (8495) has a gas flow channel running through it, and the top side of the gas flow channel is connected to the pipe (8494). The bottom of the scraper frame (8495) is provided with a micro-protrusion array composed of multiple hemispherical protrusions (84951). The bottom outlet of the gas flow channel is opened in the gap area between the hemispherical protrusions (84951).

7. The laser film water-based coating printing apparatus according to claim 5, characterized in that: The pushing component (8492) includes an eccentric rotating rod (84921) with one end connected to the shaft of the worm gear (847). A guide sleeve (84922) is rotatably connected to the side of the eccentric rotating rod (84921) away from the worm gear (847). The guide sleeve (84922) is fixedly connected to the side of the first push rod (84923). The rear end of the first push rod (84923) is rotatably connected to the support frame (8491). The front end is rotatably connected to a second push rod (84924), the front side of the second push rod (84924) is rotatably connected to a guard frame (84925), the top of the guard frame (84925) away from the second push rod (84924) is rotatably connected to a first support rod (84926), the rear end of the first support rod (84926) is rotatably connected to a second support rod (84927), and the rear side of the second support rod (84927) is rotatably connected to a support frame (8491).

8. The laser film water-based coating printing apparatus according to claim 7, characterized in that: The first push rod (84923) and the second support rod (84927) are the same size and length, the second push rod (84924) and the first support rod (84926) are the same size and length, and the bottom of the protective frame (84925) is in sliding contact with the cargo compartment (841).

9. A laser film water-based coating printing process, using the laser film water-based coating printing apparatus as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1. The laser film substrate roll to be coated is installed at the feed roller (3), and the laser film substrate is pulled around the multiple guide rollers (21) inside the cross frame (2) in sequence, so that the laser film substrate is kept flat under the printing unit (7), and the preset feeding tension is established and maintained by the discharge roller (4). S2. Start the printing unit (7) to uniformly transfer and coat the water-based coating material onto the surface of the continuously moving laser film substrate to form a wet coating that has not been dried. S3. By adjusting the position of the locking bolt (817) of the adjustment structure (81) in the arc groove (816) and the locking state of the fastening bolt (815), the rectangular frame (82) together with the hot scraping structure (84) swings around the hinge (813) to the preset working angle, and the bottom of the hot scraping structure (84) is positioned at a suitable non-contact working height above the wet coating. S4. Start the first motor (843) to adjust the cargo compartment (841) to the working height; The second motor (844) is started, and through the worm gear (845) and worm wheel (847) transmission, the first action component (849) and the second action component (8410) are driven to convert the eccentric rotation into the horizontal reciprocating linear motion of the scraper frame (8495) along the transverse direction of the material feed; at the same time, the external hot air source supplies air into the scraper frame (8495), and the hot air is blown from the air outlet in the gap area of ​​the bottom hemispherical protrusion (84951) to the wet coating surface, and the coating stripes are eliminated and the surface is accelerated by reciprocating shearing and spherical flow micro vortex; S5. After the disturbance and pre-drying treatment in step S4, the laser film continues to move forward. After passing through the discharge roller (4), it is fully dried by hot air in the drying unit so that the water-based coating is completely cured and firmly bonded to the laser film substrate. Then, the completely dried laser film is rolled up to complete the entire printing process of the water-based coating of the laser film.

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