A uniform adhesive coating device for printing rollers

Abstract

This utility model relates to a uniform glue coating device for printing rollers, belonging to the field of printing roller transfer equipment. It includes a glue tank mechanism and a glue tank adjustment mechanism. The glue tank mechanism includes a glue tank plate, a scraper, a glue tank bottom plate, glue tank blocks, and block positioning plates. The glue tank plate is fixedly mounted on the glue tank bottom plate by fasteners. The scraper is clamped between the glue tank plate and the glue tank bottom plate, with its edge in contact with the surface of the printing roller. The scraper, printing roller, arc-shaped concave surface, and glue tank blocks on both sides together form a semi-enclosed glue tank. The glue tank adjustment mechanism is used to adjust the position of the glue tank mechanism relative to the printing roller. A heat conduction channel is provided within the body of the glue tank plate, and a temperature sensor is installed on the glue tank plate. A heat conduction channel is also provided within the body of the glue tank bottom plate, and a temperature sensor is installed on the glue tank bottom plate. By controlling the temperature of the glue tank plate and the glue tank bottom plate, this application solves the technical problem of uneven glue coating on the printing roller caused by the thermal deformation of the scraper.

Description

Technical Field

[0001] This utility model relates to a device for uniformly applying adhesive to a printing roller (anilox roller), and belongs to the field of printing equipment. Background Technology

[0002] In the printing production industry, coating is a crucial process. Solvent-based adhesives, due to their solvent content, offer good fluidity and stability. Using adhesive trays or enclosed doctor blade grooves for adhesive supply and anilox roller coating allows for high coating control precision. Compared to solvent-based adhesives, solvent-free adhesives, lacking solvents, produce less volatile organic compounds and emissions, significantly reducing chemical emissions and aligning with green production trends. However, solvent-free adhesives have poorer fluidity and are prone to curing. When using anilox rollers for solvent-free adhesive coating, heating components are typically required to physically melt the adhesive, reducing its thickness and viscosity. In actual production, it has been found that the doctor blade in the adhesive tray mechanism is prone to deformation due to thermal expansion and contraction during heating, affecting coating uniformity. Therefore, currently, the coating of solvent-free adhesives generally relies on a complex five-roll differential speed coating method. Summary of the Invention

[0003] The purpose of this invention is to provide a uniform adhesive coating device for printing rollers, addressing the problem of uneven adhesive coating on anilox printing rollers caused by heat deformation of the scraper.

[0004] The technical solution adopted by this utility model is as follows: a uniform glue coating device for a printing roller, characterized in that it includes a glue tank mechanism and a glue tank adjustment mechanism. The glue tank mechanism includes a glue tank plate, a scraper, a glue tank bottom plate, glue tank blocks, and block positioning plates. The glue tank plate is fixedly mounted on the glue tank bottom plate by fasteners. The scraper is clamped between the glue tank plate and the glue tank bottom plate. The glue tank plate has an arc-shaped concave surface. The edge of the scraper protrudes from the edge of the arc-shaped concave surface and contacts the surface of the printing roller. Two glue tank blocks are respectively mounted at both ends of the arc-shaped concave surface of the glue tank plate by the block positioning plates. The scraper, the printing roller, the arc-shaped concave surface, and the glue tank blocks on both sides together form a semi-enclosed glue tank. The glue tank adjustment mechanism is used to adjust the position of the glue tank mechanism relative to the printing roller. Therefore, a heat conduction channel is provided in the body of the glue tank plate, and a temperature sensor is provided on the glue tank plate. A heat conduction channel is provided in the body of the glue tank bottom plate, and a temperature sensor is provided on the glue tank bottom plate. This ensures that the glue tank plate and the glue tank bottom plate are controlled within a reasonable deformation temperature range, thus always ensuring the straightness of the scraper.

[0005] Preferably, a heat insulation pad is provided between the glue tank plate and the glue tank bottom plate. The glue tank bottom plate is mounted on the glue tank support arm of the glue tank adjusting mechanism, and the heat insulation pad is provided between the glue tank bottom plate and the glue tank support arm. The provision of two heat insulation pads helps to maintain the temperature of the scraper and the glue tank bottom plate, reducing deformation due to temperature differences.

[0006] Preferably, a sealing gasket is provided between the glue tank block and the glue tank plate to improve the sealing between the glue tank block and the scraper and prevent glue leakage from both sides of the glue tank.

[0007] Preferably, the glue groove adjustment structure includes a glue groove support arm, a glue groove support shaft, a clutch worm gear, and a clutch worm wheel. The glue groove support arm is mounted on the glue groove support shaft via a positioning tension sleeve. The glue groove mechanism is fixedly mounted on the glue groove support arm. Both ends of the glue groove support shaft are slidably mounted on a mounting frame. The clutch worm gear and clutch worm wheel work together to drive the displacement of the glue groove support shaft on the mounting frame, thereby achieving the clutch adjustment of the glue groove mechanism relative to the printing roller. This adapts to printing rollers of different specifications.

[0008] Preferably, the printing roller is provided with a heating element, such as a heating tube, to heat the printing roller to adapt to the transfer of solvent-free adhesive and improve the adhesive transfer rate.

[0009] Preferably, a uniform adhesive impeller is provided on the inner side of the adhesive tank baffle to agitate the adhesive in the adhesive tank and prevent solidified residue from forming at the end.

[0010] Preferably, a fine-tuning screw is provided on the glue tank support arm, and the end of the fine-tuning screw abuts against the bottom plate of the glue tank. When the scraper is deformed, the fine-tuning screw can be manually rotated to act on the glue tank mechanism so that the scraper and the printing roller can make reliable contact.

[0011] Compared with the prior art, the advantages of this utility model are as follows: This application designs a semi-enclosed glue tank for coating the printing roller. Compared with the traditional glue tray method, the glue tank structure can significantly reduce the amount of glue in contact with air, ensuring that the glue does not remain in the glue tank for a long time and age.

[0012] This application incorporates a heat-conducting channel within the glue tank plate and employs a temperature sensor to monitor the real-time temperature of the scraper. The monitored temperature is used to control the optimal temperature of the liquid within the heat-conducting channel. Similarly, a heat-conducting channel is integrated into the glue tank bottom plate, regulating its temperature. A temperature sensor monitors the real-time temperature of the bottom plate, and the temperature of the liquid within the heat-conducting channel is also controlled accordingly. This achieves temperature difference control between the glue tank plate and the bottom plate, ensuring that the scraper does not deform due to temperature fluctuations, thus solving the technical problem of scraper deformation. Furthermore, this application improves the uniformity of glue application; the uniform glue coating device is particularly suitable for solvent-free roller transfer printing processes requiring high-temperature glue coating. Attached Figure Description

[0013] Figure 1 This is an axial sectional view of the uniform adhesive coating device for the printing roller in this embodiment of the present invention;

[0014] Figure 2This is a radial sectional view of the uniform adhesive coating device for the printing roller in an embodiment of this utility model;

[0015] In the diagram, the components are: 1. Printing roller; 2. Heating tube; 3. Scraper; 4. Glue tank bottom plate; 5. Glue tank stop block; 6. Stop block positioning pressure plate; 7. Heat conduction channel; 8. Heat insulation pad; 9. Sealing gasket; 10. Glue spreading impeller; 13. Glue tank support arm; 14. Positioning tension sleeve; 15. Glue tank support shaft; 16. Clutch worm gear; 17. Clutch worm wheel; 18. Mounting bracket; 19. Fine adjustment screw; 20. Temperature sensor; and 21. Glue tank plate. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0017] This embodiment relates to a uniform adhesive coating device for a printing roller, comprising a printing roller 1, an adhesive trough mechanism, and an adhesive trough adjustment mechanism. The adhesive trough mechanism is used to uniformly coat the surface of the printing roller 1 to achieve adhesive transfer. In this embodiment, the printing roller 1 is an anilox printing roller, which is equipped with a heating tube 2 inside to heat the roller body, causing the adhesive to physically melt, thicken, and reduce its stickiness, thereby improving the adhesive transfer rate.

[0018] The glue tank mechanism includes a glue tank plate 21, a scraper 3, a glue tank bottom plate 4, glue tank blocks 5, and block positioning plates 6. A heat conduction channel 7 is provided within the body of the glue tank plate 21, and its temperature is monitored by a temperature sensor 20. A heat conduction channel 7 is also provided within the body of the glue tank bottom plate 4, and its temperature is monitored by a temperature sensor 20. The glue tank plate 21 is fixed to the glue tank bottom plate 4 with fasteners, and a heat insulation pad 8 is placed between them. The scraper 3 is sandwiched between the glue tank plate and the glue tank bottom plate. The glue tank bottom plate 3 is mounted on a glue tank support arm 13, and a heat insulation pad 8 is placed between the glue tank bottom plate 3 and the glue tank support arm 13. The glue tank plate 21 has an arc-shaped concave surface, and the edge of the scraper 3 protrudes from the edge of this arc-shaped concave surface, contacting the surface of the printing roller 1. Two glue tank blocks 5 are respectively positioned at both ends of the glue tank plate 21 via block positioning plates 6, and a sealing gasket 9 is placed between the glue tank blocks 5 and the glue tank plate 21. The scraper 3, the printing roller 1, the arc-shaped concave surface of the glue tank plate 21 and the glue tank baffles 5 on both sides together form a semi-closed glue tank. At the same time, a glue-spreading impeller 10 is provided on the inner side of the glue tank baffles 5, which is used to stir the glue in the glue tank during glue application.

[0019] The glue tray adjustment mechanism is used to adjust the relative position of the glue tray mechanism and the printing roller. It includes a glue tray support arm 13, a glue tray support shaft 15, a positioning tension sleeve 14, a clutch worm gear 16 and a clutch worm wheel 17, and a mounting frame 18. The glue tray support arm 13 is mounted on the glue tray support shaft 15 via the positioning tension sleeve 14. The glue tray mechanism is then fixedly mounted on the glue tray support arm 13. A fine-tuning screw 19 is screwed onto the glue tray support arm 13, with its end pressing against the glue tray bottom plate 4. Fine-tuning of the glue tray mechanism can be achieved by turning the fine-tuning screw. The glue tray support shaft 15 is supported at both ends on bearing seats, which slide in conjunction with the mounting frame 18. The clutch worm gear 16 and clutch worm wheel 17 drive the displacement of the glue tray support shaft 15 on the mounting frame 18, thereby achieving the clutch adjustment between the glue tray mechanism and the printing roller.

[0020] The above-described roller uniform coating device can adjust the distance and axial position of the glue tank mechanism relative to the roller, as well as the adhesion method between the glue tank mechanism and the roller. By controlling the temperature of the glue tank plate and bottom plate, it solves the technical problem of blade deformation due to temperature changes. This application is particularly applicable to the micro-solvent and solvent-free coating processes in roller transfer printing.

[0021] Although the preferred embodiments of the present invention have been described in detail above, it should be clearly understood that various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A uniform adhesive coating device for a printing roller, characterized in that: The system includes a glue tank mechanism and a glue tank adjustment mechanism. The glue tank mechanism includes a glue tank plate, a scraper, a glue tank bottom plate, glue tank blocks, and block positioning plates. The glue tank plate is fixedly mounted on the glue tank bottom plate by fasteners. The scraper is clamped between the glue tank plate and the glue tank bottom plate. The glue tank plate has an arc-shaped concave surface. The edge of the scraper protrudes from the edge of the arc-shaped concave surface and contacts the surface of the printing roller. There are two glue tank blocks, which are respectively mounted at both ends of the arc-shaped concave surface of the glue tank plate by the block positioning plates. The scraper, the printing roller, the arc-shaped concave surface, and the glue tank blocks on both sides together form a semi-enclosed glue tank. The glue tank adjustment mechanism is used to adjust the position of the glue tank mechanism relative to the printing roller. Therefore, a heat conduction channel (7) is provided in the body of the glue tank plate, and a temperature sensor (20) is provided on the glue tank plate. A heat conduction channel (7) is provided in the body of the glue tank bottom plate, and a temperature sensor (20) is provided on the glue tank bottom plate.

2. The uniform coating device for the printing roller according to claim 1, characterized in that: A heat insulation pad (8) is provided between the glue tank plate and the glue tank bottom plate. The glue tank bottom plate is installed on the glue tank support arm of the glue tank adjustment mechanism. A heat insulation pad (8) is provided between the glue tank bottom plate and the glue tank support arm.

3. The uniform coating device for the printing roller according to claim 1, characterized in that: A sealing gasket is provided between the glue groove stop block and the glue groove plate.

4. The uniform coating device for the printing roller according to claim 1, characterized in that: The glue groove adjustment structure includes a glue groove support arm, a glue groove support shaft, a clutch worm gear, and a clutch worm wheel. The glue groove support arm is mounted on the glue groove support shaft via a positioning tension sleeve. The glue groove mechanism is fixedly mounted on the glue groove support arm. The two ends of the glue groove support shaft are slidably mounted on the mounting frame. The displacement of the glue groove support shaft on the mounting frame is driven by the cooperation of the clutch worm gear and the clutch worm wheel to achieve the clutch adjustment of the glue groove mechanism relative to the printing roller.

5. The uniform coating device for the printing roller according to claim 1, characterized in that: The printing roller is equipped with a heating element inside.

6. The uniform coating device for the printing roller according to claim 1, characterized in that: A glue-spreading impeller is provided on the inner side of the glue groove block.

7. The uniform coating device for the printing roller according to claim 4, characterized in that: The adhesive groove support arm is equipped with a fine-tuning screw, the end of which abuts against the bottom plate of the adhesive groove.

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