Uniform gluing device for printing roller

Abstract

The utility model relates to a uniform gluing device for a plate roller, and belongs to the field of plate roller transfer printing equipment. Comprising a glue groove mechanism and a glue groove adjusting mechanism, the glue groove mechanism comprises a scraper, a glue groove bottom plate, a glue groove check block and a check block positioning pressing plate, the scraper is fixedly arranged on the glue groove bottom plate through a fastener, the scraper is provided with an arc-shaped concave face, one edge of the arc-shaped concave face makes contact with the surface of a printing roller, and the other edge of the arc-shaped concave face makes contact with the printing roller. The two glue groove check blocks are arranged at the two ends of the scraper through the check block positioning pressing plates respectively, a semi-closed glue groove is jointly defined by the printing roller, the arc-shaped concave face and the glue groove check blocks on the two sides, and the edge of the scraper is in reliable contact with the printing roller all the time under the elastic supporting effect. And the glue groove adjusting mechanism is used for adjusting the position of the glue groove mechanism relative to the plate roller. The technical problem of non-uniform plate roller gluing caused by thermal deformation of the scraper of the glue groove mechanism is solved.

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 closed-groove systems for dispensing and anilox roller coating allows for high precision in coating control. 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 elements are typically designed to heat the roller and slow down the curing process. 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 contact with the heated anilox roller, thus affecting the uniformity of adhesive application. 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 in 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 scraper, a glue tank bottom plate, glue tank blocks, and block positioning plates. The scraper is fixedly mounted on the glue tank bottom plate by fasteners. The scraper has an arc-shaped concave surface, one edge of which contacts the surface of the printing roller. Two glue tank blocks are respectively mounted on both ends of the scraper by the block positioning plates. The printing roller, the arc-shaped concave surface, and the glue tank blocks on both sides together form a semi-enclosed glue tank. The edge of the scraper is always reliably in contact with the surface of the printing roller due to elastic support. The glue tank adjustment mechanism is used to adjust the position of the glue tank mechanism relative to the printing roller.

[0005] Preferably, a sealing gasket is provided between the glue tank baffle and the scraper to improve the sealing between the glue tank baffle and the scraper and prevent glue leakage from both sides of the glue tank.

[0006] Preferably, a reinforcing groove is provided on the lower surface of the scraper, and the reinforcing groove is close to the edge of the scraper, so that the edge has a tendency to elastically deform. The function of the reinforcing groove is to reduce the strength of the scraper, so that the scraper can undergo slight deformation when subjected to elastic force, thereby better conforming to the surface of the printing roller.

[0007] Preferably, an elastic airbag is provided on the upper surface of the glue tank bottom plate. The elastic airbag is in elastic contact with the scraper. The elastic airbag always elastically supports the scraper, counteracting the heat deformation of the scraper itself and ensuring reliable contact between the scraper and the printing roller.

[0008] Preferably, a heat conduction channel is provided in the body of the scraper, and a heat insulation pad is provided between the scraper and the bottom plate of the glue tank to reduce the heat deformation of the bottom plate of the glue tank.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] Compared with existing technologies, 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, this glue tank structure can significantly reduce the amount of glue in contact with air and delay the curing of the glue. Therefore, it can reduce the amount of solvent used in the glue, reduce the volatile solvents in the production environment, and reduce the evaporation and curing time of the coated product. The design of the elastic support force acting on the doctor blade to counteract the thermal deformation of the doctor blade ensures that the doctor blade and the printing roller are always in reliable contact, improving the uniformity of glue application. The uniform glue coating device of this application is particularly suitable for solvent-free printing roller transfer processes that require high-temperature glue coating. Attached Figure Description

[0014] 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;

[0015] Figure 2 This is a radial sectional view of the uniform adhesive coating device for the printing roller in an embodiment of this utility model;

[0016] 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; 11. Reinforcing groove; 12. Elastic airbag; 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. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0018] 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, and a heating tube 2 is provided inside it to heat the roller body, prolonging the curing of the adhesive and improving the adhesive transfer rate.

[0019] The glue tank mechanism includes 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 scraper 3. The scraper 3 is fixed to the glue tank bottom plate 4 by fasteners, with a heat insulation pad 8 placed between them. The scraper 3 has an arc-shaped concave surface, the edge of which contacts the surface of the printing roller 1. Two glue tank blocks 5 are respectively positioned at both ends of the scraper 1 via the block positioning plates 6. A sealing gasket 9 is placed between the glue tank blocks 5 and the scraper 3. The printing roller 1, the arc-shaped concave surface, and the glue tank blocks 5 on both sides together form a semi-enclosed glue tank. A glue-spreading impeller 10 is provided inside the glue tank blocks 5 to agitate the glue in the tank during application. A reinforcing groove 11 is provided on the lower surface of the scraper 3. The reinforcing groove 11 is close to the edge of the scraper 3, so that the edge has the ability to undergo elastic deformation. Furthermore, an elastic airbag 12 is provided on the upper surface of the glue tank bottom plate 4. The elastic airbag 12 is in elastic contact with the scraper 3. The elastic airbag 12 always elastically supports the scraper 3. Under the action of elastic support, the edge of the scraper 3 is always in reliable contact with the printing roller 1.

[0020] 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.

[0021] 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. It utilizes an elastic airbag to ensure elastic contact between the scraper and the roller, solving the technical problem of uneven glue coating caused by scraper thermal deformation. This application is particularly applicable to the micro-solvent and solvent-free coating processes in roller transfer printing.

[0022] Although the preferred embodiments of this utility model have been described in detail above, it should be clearly understood that various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An apparatus for uniform coating of a plate cylinder, characterized by: The glue groove mechanism comprises a scraper, a glue groove bottom plate, a glue groove block and a block positioning pressing plate, the scraper is fixedly arranged on the glue groove bottom plate through fasteners, the scraper has an arc-shaped concave surface, one edge of the arc-shaped concave surface is in contact with the surface of the plate roller, the glue groove block has two ends arranged at two ends of the scraper through the block positioning pressing plate, the plate roller, the arc-shaped concave surface and the glue groove blocks on two sides jointly form a semi-closed glue groove, and the edge of the scraper is in reliable contact with the plate roller under the action of elastic support; the glue groove adjusting mechanism is used for adjusting the position of the glue groove mechanism relative to the plate roller.

2. An apparatus for uniform coating of a plate cylinder as claimed in claim 1, characterized in that A sealing gasket is arranged between the glue groove block and the scraper.

3. The apparatus for uniform coating of a plate cylinder according to claim 1, characterized in that: A strength reduction groove is arranged on the lower surface of the scraper, the strength reduction groove is close to the edge of the scraper, and the edge has a tendency of elastic deformation.

4. The apparatus for uniform coating of a plate cylinder according to claim 1, characterized in that: An elastic air bag is arranged on the upper surface of the glue groove bottom plate, the elastic air bag is in elastic contact with the scraper, and the elastic air bag always elastically supports the scraper.

5. The apparatus for uniform coating of a plate cylinder according to claim 1, characterized in that: A heat conduction channel is arranged in the body of the scraper, and a heat insulation pad is arranged between the scraper and the glue groove bottom plate.

6. The apparatus for uniform coating of a plate cylinder according to claim 1, characterized in that: The glue groove adjusting structure comprises a glue groove supporting arm, a glue groove supporting shaft, a clutch worm and a clutch worm wheel, the glue groove supporting arm is installed on the glue groove supporting shaft through a positioning tension sleeve, the glue groove mechanism is fixedly installed on the glue groove supporting arm, the glue groove supporting shaft is slidably installed at two ends of the installation frame, and the displacement of the glue groove supporting shaft on the installation frame is driven by cooperation of the clutch worm and the clutch worm wheel to realize clutch adjustment of the glue groove mechanism relative to the plate roller.

7. The apparatus for uniform coating of a plate cylinder according to claim 1, characterized in that: A heating element is arranged in the plate roller.

8. The apparatus for uniform coating of a plate cylinder according to claim 1, characterized in that: An even glue impeller is arranged on the inner side of the glue groove block.

9. The apparatus for uniform coating of a plate cylinder according to claim 6, characterized in that: A fine adjustment screw is arranged on the glue groove supporting arm, and the end of the fine adjustment screw abuts against the glue groove bottom plate.

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