Surface adhesion micropore coating process for paper-based material

Abstract

The invention belongs to the technical field of papermaking, and particularly relates to a surface adhesive microporous coating process for a paper-based material, which comprises the following steps: S1, coating preparation: preparing an adhesive coating by taking polyvinyl alcohol (PVA) and starch as adhesives and taking TiO2 and porcelain clay as pigments; s2, coating: coating a printable coating structure on the surface of the decorative paper-based functional material through a coating machine. Titanium dioxide is concentrated on the surface of the paper-based material through a surface adhesion micropore coating technology, the covering property of the titanium dioxide is fully exerted, meanwhile, the surface smoothness, the surface strength and the printability of the decorative paper-based material are improved, and the ink absorbency, the printing pattern drying rate and the pattern color of the decorative paper-based material are improved; therefore, the printability of the decorative paper-based functional material for printing is improved. The titanium dioxide is added in a surface coating mode, 100% retention of the titanium dioxide is achieved, the covering power of the titanium dioxide is exerted to the maximum extent, the addition amount of the titanium dioxide in the pulp is reduced, the cost is saved, and the strength of the decorative paper-based functional material is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of papermaking, and particularly relates to a surface adhesion microporous coating process for paper-based materials. Background Art

[0002] The surface of the decorative paper-based functional material for printing plays a decorative role on the surfaces of artificial boards and particle boards by printing various patterns. High-quality decorative paper-based functional materials need to have high printing suitability. After printing, it is required that the surface color is uniform, the pattern is clear, and the layering is strong, playing a good decorative role. Surface roughness and evenness are important factors affecting the printing quality of decorative paper-based functional materials. It determines the degree of contact between the paper surface and the printing plate surface or the blanket surface, and directly affects the ink transfer amount, the clarity, fineness, and layering of the printed image, etc. The decorative paper-based functional material is composed of long fibers, short fibers, and a large amount of fillers. During the wet forming process, the fiber interweaving and the distribution of fillers are not uniform, and pores will be formed on the surface of the decorative paper-based material, presenting a rough surface with different heights, thus affecting its printing performance. In addition, in the traditional process for producing decorative paper-based functional materials, the addition amount of fillers such as titanium dioxide is too large, which will cause the loss of fillers and the increase of costs, and at the same time seriously affect the strength of the formed paper. Summary of the Invention

[0003] The purpose of the present invention is to provide a surface adhesion microporous coating process for paper-based materials aiming at the above-mentioned existing technical problems, achieving the effects of improving the printing suitability of the decorative paper-based functional material for printing, saving costs, and ensuring the strength of the decorative paper-based functional material.

[0004] In view of this, the present invention provides a surface adhesion microporous coating process for paper-based materials, including the following steps: S1, Coating production: Prepare an adhesive coating with polyvinyl alcohol (PVA) and starch as adhesives and TiO2 and kaolin as pigments; S2, Coating: Coat a printable coating structure on the surface of the decorative paper-based functional material through a coater.

[0005] In this technical solution, through the surface adhesion microporous coating technology, titanium dioxide is concentrated on the surface of the paper-based material, giving full play to its covering property. At the same time, the surface smoothness, surface strength, and printing suitability of the decorative paper-based material are improved, and its ink absorption property, drying rate of the printed pattern, and pattern color are improved, thereby improving the printing suitability of the decorative paper-based functional material for printing. By adding titanium dioxide in the way of surface coating, 100% retention of titanium dioxide is achieved, maximizing the covering property of titanium dioxide, reducing the addition amount of titanium dioxide in the pulp, saving costs, and ensuring the strength of the decorative paper-based functional material, with its longitudinal tensile index ≥ 20.0 N·m / g and longitudinal wet tensile index ≥ 5.0 N·m / g.

[0006] Furthermore, the coater includes a frame, on which a transfer roller is provided, and also includes: A coating roller, which is arranged below the transfer roller, and there is a paper passing gap between the coating roller and the transfer roller; A glue tank, which is used to contain the adhesive coating; A transfer roller, which is arranged between the glue tank and the coating roller, and part of the transfer roller is immersed in the adhesive coating in the glue tank, and the transfer roller is used to transfer the adhesive coating onto the coating roller; A lifting assembly, which is used to lift and lower the glue tank to adjust the distance between the transfer roller and the glue tank.

[0007] In this technical solution, the distance between the transfer roller and the glue tank can be adjusted as needed, that is, the depth of the transfer roller immersed in the adhesive coating in the glue tank is adjusted to adapt to the production in different situations.

[0008] Furthermore, the lifting assembly includes: An adjusting rod, one end of which is an adjusting handle and the other end is a worm; A rotating shaft, which is rotatably arranged on the frame, and a turbine and a lifting gear are circumferentially and fixedly connected to the rotating shaft, and the turbine meshes with the worm; A lifting rack, which is slidably arranged up and down on the frame and is fixedly connected to the bottom of the glue tank, and the lifting rack meshes with the lifting gear.

[0009] In this technical solution, when it is necessary to adjust the distance between the glue tank and the transfer roller, rotate the adjusting rod to make the worm rotate, drive the turbine to rotate, make the rotating shaft drive the lifting gear to rotate, so that the lifting rack rises and falls to drive the glue tank to move up and down.

[0010] Furthermore, the glue tank has a progressive feeding structure, which is used to make the glue tank gradually rise close to the transfer roller as the liquid level of the adhesive coating in the glue tank gradually drops.

[0011] In this technical solution, the amount of the adhesive coating adhered by the transfer roller each time it rotates one circle can be made basically the same, and does not decrease as the liquid level drops.

[0012] Furthermore, the progressive feeding structure includes: An extension pipe, which is fixedly connected below the glue tank, and the lower end of the above-mentioned lifting rack is slidably arranged in the extension pipe; A feeding spring, which is arranged in the extension pipe, one end of the feeding spring is connected to the inner top wall of the extension pipe, and the other end is connected to the top of the lifting rack.

[0013] In this technical solution, when the adhesive coating in the glue tank decreases during the coating process, the liquid level drops, and the overall weight of the glue tank also decreases. Then, the elastic force of the feed spring is released, causing the glue tank to move upward a little. Under normal circumstances, the feed spring is compressed, but the positional relationship between the extension tube and the lifting rack also remains in a stable balance. Therefore, the step-feed structure does not affect the lifting adjustment of the glue tank by the lifting assembly.

[0014] Further, a limit stop is provided on the lifting rack.

[0015] Further, the limit stop includes two upper and lower blocks.

[0016] In this technical solution, the limit stop can prevent the lifting rack from completely sliding out of the extension tube.

[0017] Further, a cleaning assembly is correspondingly provided for the glue tank. The cleaning assembly is used to clean and wipe the inner wall of the glue tank when replacing the adhesive coating.

[0018] Further, the cleaning assembly includes: A wiping brush, which is interactively arranged in the glue tank, and the cross-sectional shape of the wiping brush matches the cross-sectional shape of the glue tank; A driving assembly, which is used to drive the wiping brush to move along the length direction of the glue tank.

[0019] Further, the driving assembly includes: A driving motor, which is fixedly arranged on the outer side wall of the glue tank; A driving lead screw, which is parallel to the length direction of the glue tank and is circumferentially fixedly connected to the output end of the driving motor, and the wiping brush is helically connected to the driving lead screw.

[0020] In this technical solution, when the adhesive coating in the glue tank is used up and another adhesive coating needs to be replaced, the glue tank needs to be cleaned and then new coating is injected. During cleaning, the driving motor is started to rotate the driving lead screw, which drives the wiping brush to move along the length direction of the driving lead screw, so that the wiping brush wipes and cleans the bottom of the inner wall of the glue tank.

[0021] The beneficial effects of the present invention are: 1. By the surface adhesion microporous coating technology, titanium dioxide is concentrated on the surface of the paper-based material, giving full play to its covering property. At the same time, the surface smoothness, surface strength and printability of the decorative paper-based material are improved, and its ink absorption, drying rate of printed patterns and pattern colors are improved, thereby improving the printing suitability of the decorative paper-based functional material for printing. By adding titanium dioxide in the form of surface coating, 100% retention of titanium dioxide is achieved, maximizing the covering property of titanium dioxide, reducing the addition amount of titanium dioxide in the pulp, saving costs, and ensuring the strength of the decorative paper-based functional material.

[0022] 2. The distance between the transfer roller and the glue tank can be adjusted as needed, that is, the depth of the transfer roller immersed in the adhesive coating in the glue tank can be adjusted to adapt to the production under different conditions.

[0023] 3. The step-feed structure can ensure that the amount of adhesive coating adhered by the transfer roller each time it rotates one circle is basically the same, and does not decrease as the liquid level drops.

[0024] 4. When the adhesive coating in the glue tank decreases during the coating process, the liquid level drops and the overall weight of the glue tank also decreases. Then the elastic force of the feed spring is released, causing the glue tank to move up a little. Under normal circumstances, the feed spring is compressed, but the positional relationship between the extension tube and the lifting rack also remains in a stable balance. Therefore, the step-feed structure does not affect the lifting adjustment of the glue tank by the lifting assembly.

[0025] 5. The limit stop can prevent the lifting rack from completely sliding out of the extension tube.

[0026] 6. The cleaning assembly can clean and wipe the inner wall of the glue tank when replacing the adhesive coating. Description of the Drawings

[0027] Figure 1 is a perspective view of the present invention; Figure 2 is a rear view of the coater; Figure 3 is Figure 2 a partial enlarged view of part A in Figure 4 is Figure 3 a partial enlarged view of part B in Figure 5 is a perspective view of the glue tank and the cleaning assembly; The markings in the figure are indicated as: 1. Frame; 2. Transmission roller; 3. Coating roller; 4. Glue tank; 5. Transfer roller; 6. Lifting assembly; 7. Adjusting rod; 8. Adjusting handle; 9. Worm; 10. Rotating shaft; 11. Turbine; 12. Lifting gear; 13. Lifting rack; 14. Extension tube; 15. Feed spring; 16. Limit stop; 17. Cleaning assembly; 18. Wiping brush; 19. Driving motor; 20. Driving lead screw. Detailed Embodiments

[0028] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope protected by the present application.

[0029] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present application. For the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters in the following drawings denote like items, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0031] It should be noted that in the description of the present application, the orientation or positional relationships indicated by the orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present application and simplifying the description. Without contrary instructions, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as limiting the protection scope of the present application; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0032] It should be noted that in this application, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or elements inherent to such process, method, article or device. Without more limitations, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of this application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0033] Example 1 A surface adhesion microporous coating process for paper-based materials, comprising the following steps: S1, Coating production: Prepare an adhesive coating using polyvinyl alcohol (PVA) and starch as adhesives, and TiO2 and kaolin as pigments; S2, Coating: Coat a printable coating structure on the surface of the decorative paper-based functional material through a coating machine.

[0034] By means of the surface adhesion microporous coating technology, titanium dioxide is concentrated on the surface of the paper-based material, giving full play to its covering property. At the same time, the surface smoothness, surface strength and printability of the decorative paper-based material are improved, and its ink absorbency, drying rate of printed patterns and pattern colors are improved, thereby improving the printing suitability of the decorative paper-based functional material for printing. By adding titanium dioxide through surface coating, 100% retention of titanium dioxide is achieved, maximizing the covering property of titanium dioxide, reducing the addition amount of titanium dioxide in the pulp, saving costs, and ensuring the strength of the decorative paper-based functional material, with its longitudinal tensile index ≥ 20.0 N.m / g and longitudinal wet tensile index ≥ 5.0 N.m / g.

[0035] Example 2 As Figures 1-5 shown, the coating machine includes a frame 1, on which a transmission roller 2 is provided, and further provided with: A coating roller 3, the coating roller 3 is arranged below the transmission roller 2, and there is a paper passing gap between the coating roller 3 and the transmission roller 2; An adhesive tank 4, the adhesive tank 4 is used to hold the adhesive coating; A transfer roller 5 is provided between the glue tank 4 and the coating roller 3. The transfer roller 5 is partially immersed in the adhesive coating in the glue tank 4, and the transfer roller 5 is used to transfer the adhesive coating onto the coating roller 3. A lifting assembly 6 is used to lift and lower the glue tank 4 to adjust the distance between the transfer roller 5.

[0036] The distance between the transfer roller 5 and the glue tank 4 can be adjusted as needed, that is, the depth of the transfer roller 5 immersed in the adhesive coating in the glue tank 4 can be adjusted to adapt to production under different conditions.

[0037] Embodiment 3 As Figure 3 shown, the lifting assembly 6 includes: An adjusting rod 7, one end of the adjusting rod 7 is an adjusting handle 8, and the other end is a worm 9. A rotating shaft 10 is rotatably arranged on the frame 1. A turbine 11 and a lifting gear 12 are circumferentially and fixedly connected to the rotating shaft 10. The turbine 11 meshes with the worm 9. A lifting rack 13 is slidably arranged up and down on the frame 1 and is fixedly connected to the bottom of the glue tank 4. The lifting rack 13 meshes with the lifting gear 12.

[0038] When it is necessary to adjust the distance between the glue tank 4 and the transfer roller 5, rotate the adjusting rod 7 to make the worm 9 rotate, drive the turbine 11 to rotate, and make the rotating shaft 10 drive the lifting gear 12 to rotate, so that the lifting rack 13 rises and falls to drive the glue tank 4 to move up and down.

[0039] Embodiment 4 As Figure 4 shown, the glue tank 4 has a progressive feeding structure, and the progressive feeding structure is used to make the glue tank 4 gradually rise close to the transfer roller 5 as the liquid level of the adhesive coating in the glue tank 4 gradually drops.

[0040] It can make the amount of adhesive coating adhered by the transfer roller 5 each time it rotates one circle basically the same, without decreasing as the liquid level drops.

[0041] The progressive feeding structure includes: An extension pipe 14 is fixedly connected below the glue tank 4, and the lower end of the above-mentioned lifting rack 13 is slidably arranged in the extension pipe 14. A feeding spring 15 is arranged in the extension pipe 14. One end of the feeding spring 15 is connected to the inner top wall of the extension pipe 14, and the other end is connected to the top of the lifting rack 13.

[0042] When the adhesive coating in the glue tank 4 decreases during the coating process, the liquid level drops, and the overall weight of the glue tank 4 also decreases. Then, the elastic force of the feed spring 15 is released, causing the glue tank 4 to move upward a little. Under normal circumstances, the feed spring 15 is compressed, but the positional relationship between the extension tube 14 and the lifting rack 13 also remains in a stable balance. Therefore, the step-feed structure does not affect the lifting adjustment of the glue tank 4 by the lifting assembly 6.

[0043] A limit stop 16 is provided on the lifting rack 13. The limit stop 16 can prevent the lifting rack 13 from completely sliding out of the extension tube 14.

[0044] Embodiment Five As Figure 5 shown, the limit stop 16 includes two upper and lower blocks.

[0045] A cleaning assembly 17 is correspondingly provided for the glue tank 4. The cleaning assembly 17 is used to clean and wipe the inner wall of the glue tank 4 when replacing the adhesive coating.

[0046] The cleaning assembly 17 includes: A wiping brush 18, which is interactively arranged in the glue tank 4, and the cross-sectional shape of the wiping brush 18 matches the cross-sectional shape of the glue tank 4; A driving assembly, which is used to drive the wiping brush 18 to move along the length direction of the glue tank 4.

[0047] The driving assembly includes: A driving motor 19, which is fixedly arranged on the outer side wall of the glue tank 4; A driving lead screw 20, which is parallel to the length direction of the glue tank 4 and is circumferentially fixedly connected to the output end of the driving motor 19. The wiping brush 18 is helically connected to the driving lead screw 20.

[0048] When the adhesive coating in the glue tank 4 is used up and another adhesive coating needs to be replaced, the glue tank 4 needs to be cleaned before injecting new coating. Then, when cleaning, start the driving motor 19 to rotate the driving lead screw 20 to drive the wiping brush 18 to move along the length direction of the driving lead screw 20, so that the wiping brush 18 wipes and cleans the bottom inner wall of the glue tank 4.

[0049] The embodiments of the present application have been described above in conjunction with the accompanying drawings. Without conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection scope of the present application.

Claims

1. A surface adhesion microporous coating process for paper-based materials, characterized in that , including the following steps: S1, Coating production: Prepare an adhesive coating with polyvinyl alcohol (PVA) and starch as adhesives and TiO2 and kaolin as pigments. S2, Coating: Apply a printable coating structure on the surface of the decorative paper-based functional material through a coater.

2. The surface adhesion microporous coating process for a paper-based material according to claim 1, characterized in that, The coater includes a frame (1), on which a transfer roller (2) is provided, and also includes: A coating roller (3), the coating roller (3) is arranged below the transfer roller (2), and there is a paper passing gap between the coating roller (3) and the transfer roller (2); An adhesive tank (4), the adhesive tank (4) is used to hold the adhesive coating; A transfer roller (5), the transfer roller (5) is arranged between the adhesive tank (4) and the coating roller (3), and the transfer roller (5) is partially immersed in the adhesive coating in the adhesive tank (4), and the transfer roller (5) is used to transfer the adhesive coating onto the coating roller (3); A lifting assembly (6), the lifting assembly (6) is used to lift and lower the adhesive tank (4) to adjust the distance between the transfer roller (5) and the coating roller (3).

3. A surface adhesion microporous coating process for paper-based materials according to claim 2, characterized in that, The lifting assembly (6) includes: An adjusting rod (7), one end of the adjusting rod (7) is an adjusting handle (8), and the other end is a worm (9); A rotating shaft (10), the rotating shaft (10) is rotatably arranged on the frame (1), and a turbine (11) and a lifting gear (12) are circumferentially and fixedly connected to the rotating shaft (10), and the turbine (11) meshes with the worm (9); A lifting rack (13), the lifting rack (13) is slidably arranged up and down on the frame (1) and is fixedly connected to the bottom of the adhesive tank (4), and the lifting rack (13) meshes with the lifting gear (12).

4. A surface adhesion microporous coating process for paper-based materials according to claim 3, characterized in that, The adhesive tank (4) has a progressive feeding structure, and the progressive feeding structure is used to gradually raise the adhesive tank (4) closer to the transfer roller (5) as the liquid level of the adhesive coating in the adhesive tank (4) gradually drops.

5. A surface adhesion microporous coating process for paper-based materials according to claim 4, characterized in that, The progressive feeding structure includes: An extension tube (14), the extension tube (14) is fixedly connected below the adhesive tank (4), and the lower end of the above-mentioned lifting rack (13) is slidably arranged in the extension tube (14); A feeding spring (15), the feeding spring (15) is arranged in the extension tube (14), one end of the feeding spring (15) is connected to the inner top wall of the extension tube (14), and the other end is connected to the top of the lifting rack (13).

6. A surface adhesion microporous coating process for paper-based materials according to claim 5, characterized in that, A limit stop block (16) is arranged on the lifting rack (13).

7. A surface adhesion microporous coating process for paper-based materials according to claim 6, characterized in that, The limit stop block (16) includes two upper and lower blocks.

8. A surface adhesion microporous coating process for paper-based materials according to claim 7, characterized in that A cleaning assembly (17) is correspondingly arranged on the adhesive tank (4), and the cleaning assembly (17) is used to clean and wipe the inner wall of the adhesive tank (4) when replacing the adhesive coating.

9. A surface adhesion microporous coating process for a paper-based material according to claim 8, characterized in that, The cleaning assembly (17) includes: A wiping brush (18), the wiping brush (18) is interactively arranged in the adhesive tank (4), and the cross-sectional shape of the wiping brush (18) matches the cross-sectional shape of the adhesive tank (4); A driving assembly, the driving assembly is used to drive the wiping brush (18) to move along the length direction of the adhesive tank (4).

10. A surface adhesion microporous coating process for paper-based materials according to claim 9, characterized in that, The driving assembly includes: A driving motor (19), the driving motor (19) is fixedly arranged on the outer side wall of the adhesive tank (4); A driving lead screw (20), the driving lead screw (20) is parallel to the length direction of the glue tank (4) and is circumferentially fixedly connected to the output end of the driving motor (19), and the wiping brush (18) is helically connected to the driving lead screw (20).

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