A roll coater

Abstract

The application relates to the technical field of coating machines, in particular to a roller coating machine, which comprises a roller coating mechanism, the roller coating mechanism comprises a coating roller, a metering roller and a pattern-eliminating roller, the pattern-eliminating roller is arranged in parallel with the roller shaft of the coating roller, and the roller surface is in contact with the roller surface of the coating roller; the roller coating mechanism comprises a plurality of the pattern-eliminating rollers, and the pattern-eliminating rollers are soft rollers. Through the arrangement of the plurality of pattern-eliminating rollers, especially the fact that the pattern-eliminating rollers are soft rollers, the roller transverse printing on the coating roller can be eliminated in time, and the paint decoration effect is improved.

Description

Technical Field

[0001] This application relates to the technical field of coating machines, specifically a roller coating machine. Background Technology

[0002] A roller coater is a device that uses rollers to apply paint (or adhesives, inks, etc.) to the surface of a substrate (such as flooring, metal sheets, plastic films, paper, or fabrics). The metering roller (or doctor roller) is the core component of the roller coater that controls the coating thickness. It achieves quantitative transfer of paint by precisely controlling the gap between itself and the applicator roller and the inter-roller shear force. Metering rollers are often made of hard, smooth surfaces (such as chrome-plated steel rollers or ceramic rollers) to ensure precise scraping.

[0003] The prior art discloses patent document 1: Chinese patent application publication number CN104589677A, and patent document 2: Chinese patent announcement number CN220111455U.

[0004] According to the apparatus described in Patent Document 1, the roller coating machine used is a two-roller coating machine that uses a smooth metal roller as the metering roller and a rubber roller as the coating roller. In the production process of a roller coating machine that uses a high-hardness, smooth metal roller as the metering roller and a rubber roller as the coating roller, the metering roller presses against the coating roller, leaving horizontal roller marks on the surface of the coating roller. This results in obvious processing ripples on the coating of the substrate, also known as vertical marks or circumferential marks.

[0005] According to Patent Document 2, the apparatus comprises a three-roll coating system consisting of a coating roller, a metering roller, and a texture-removing roller. However, the existing texture-removing roller is not effective at eliminating transverse printing, resulting in poor performance in eliminating processing ripples, and further improvements are needed. Utility Model Content

[0006] This application is made based on the above background, and its purpose is to provide a roller coating machine that can eliminate processing ripples.

[0007] To achieve the above objectives, this application relates to a roller coating machine:

[0008] The system includes a roller coating mechanism, which comprises a coating roller, a metering roller, and a texture-removing roller. The texture-removing roller is configured such that its roller shaft is parallel to the roller shaft of the coating roller, and its roller surface is in contact with the roller surface of the coating roller. The roller coating mechanism includes a plurality of texture-removing rollers, which are soft rollers.

[0009] Preferably, the hardness of the main body of the texture-reducing roller is 20-30 degrees.

[0010] Preferably, the metering roller is positioned on one side of the coating roller, and the texture-removing roller is positioned above the coating roller and close to the metering roller.

[0011] Preferably, the metering roller is positioned in front of the coating roller, according to the conveying direction of the roller coater.

[0012] Preferably, the diameter of the anti-wrinkle roller is 55-65mm.

[0013] Preferably, there is a gap between the roller surfaces of adjacent anti-roughness rollers.

[0014] Preferably, the gap between the roller surfaces of adjacent anti-wrinkle rollers is 18-22 mm.

[0015] Preferably, the anti-wrinkle roller is passively rotated by the coating roller.

[0016] Preferably, the roller coating mechanism includes two of the texture-removing rollers.

[0017] Preferably, the line connecting the axis of one of the anti-roughness rollers and the axis of the coating roller has an acute angle of 128-132° with the conveying surface of the roller coater, and the line connecting the axis of the other anti-roughness roller and the axis of the coating roller has an acute angle of 115-120° with the conveying surface of the roller coater.

[0018] In summary, the roller coating machine provided in this application, by using multiple anti-marking rollers, especially soft rollers, can promptly eliminate roller marks on the coating roller and improve the coating effect compared to the structure of a single anti-marking roller or a hard roller in the prior art. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide further explanation of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0020] Figure 1 This is a schematic diagram of a roller coating machine provided in an embodiment of this application.

[0021] Figure 2 This is a schematic diagram of the working state of the roller coating machine provided in the embodiments of this application.

[0022] Figure 3 This refers to the paint finish achieved by existing roller coating machines.

[0023] Figure 4 This describes the coating effect achieved by using the roller coating machine provided in the embodiments of this application.

[0024] In the above figures: 10, roller coating mechanism; 11, coating roller; 12, metering roller; 13, texture removal roller; 20, conveying mechanism; 30, paint supply mechanism; 40, workpiece; x, conveying direction. Detailed Implementation

[0025] The technical solutions in this application are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] A roller coating machine provided according to an embodiment of this application, such as... Figure 1 As shown, the coating mechanism 10 is mounted above the conveying mechanism 20. The conveying mechanism 20 is a roller conveyor, for example, a structure including a frame, a row of conveying rollers, a motor, a drive belt, etc. A pair of mounting plates are mounted on the frame, on both sides of the row of conveying rollers, by means of screwing or welding. The pair of mounting plates are metal plates with a certain strength and width, suitable for mounting the coating mechanism 10.

[0027] The roller coating mechanism 10 includes a coating roller 11, a metering roller 12, and a texture-removing roller 13. The coating roller 11 can be a structure in which a roller body made of materials such as ethylene propylene rubber (EPDM), neoprene rubber, hyperalone rubber, nitrile rubber, silicone rubber, polyurethane rubber, and butyl rubber is appropriately covered on a roller shaft. The hardness of the roller body, measured using a Shore hardness tester, is 30-35 degrees. Those skilled in the art will understand that, in order to obtain a smooth coating, the coating roller 11 has a large roller diameter; a coating roller 11 of the prior art can be used. The two ends of the roller shaft of the coating roller 11 are mounted on a pair of mounting plates via bearings and are driven by a first motor to rotate actively. The first motor is any type of prior art, and the transmission method between the first motor and the coating roller 11 is also prior art, such as transmission via a belt.

[0028] Additionally, the two ends of the coating roller 11 can be mounted on a pair of first movable plates via bearings, and the first movable plates can be raised and lowered relative to the mounting plates. The lifting and lowering can be driven and controlled by an electric cylinder system, an electric servo screw system, or a manual screw system, to adjust the distance between the coating roller 11 and the conveying surface to accommodate the passage of workpieces 40 of various thicknesses.

[0029] The metering roller 12 is a smooth, hard roller, such as a steel roller or a carbide roller. Those skilled in the art will understand that, in order to achieve controlled coating thickness, the metering roller 12 has a roller diameter approximately equal to that of the coating roller 11; a metering roller 12 of the prior art can be used. The metering roller 12 is configured such that its roller shaft is parallel to that of the coating roller 11, but the bottom of the main body of the metering roller 12 is higher than the bottom of the main body of the coating roller 11 to avoid contact between the metering roller 12 and the surface of the workpiece. The two ends of the roller shaft of the metering roller 12 are mounted on a pair of mounting plates via bearings and are driven by a second motor to rotate actively. The second motor is any of the prior art, and the transmission method between the second motor and the coating roller 11 is also prior art, such as transmission via a belt.

[0030] Additionally, both ends of the metering roller 12 can be mounted on a pair of second movable plates via bearings, and the second movable plates can move up and down or horizontally relative to the mounting plates. The lifting and lowering can be driven and controlled by an electric cylinder system, an electric servo screw system, or a manual screw system. The horizontal movement can be driven by an electric servo screw system or a manual screw system. This is used to adjust the distance between the metering roller 12 and the conveying surface to accommodate workpieces 40 of various thicknesses, and simultaneously adjust the gap between the roller surface of the metering roller 12 and the roller surface of the coating roller 11 to adjust the coating thickness.

[0031] Furthermore, both the first and second motors are configured as speed-adjustable motors, and the coating thickness is adjusted by regulating the speed difference between the metering roller 12 and the coating roller 11. Generally, the speed of the metering roller 12 is greater than that of the coating roller 11. The rotation directions of the metering roller 12 and the coating roller 11 should be opposite, with the coating roller 11 configured to rotate (forward) in the direction of rotation that conveys the workpiece 40 downstream, and correspondingly, the metering roller 12 configured as a reverse-rotation roller.

[0032] In addition, according to the conveying direction x of the roller coating machine, that is, the direction in which the workpiece 40 is conveyed downstream, the metering roller 12 is positioned in front of the coating roller 11, that is, the metering roller 12 is positioned on the downstream side of the coating roller 11, which is conducive to forming a smooth and uniform coating.

[0033] The anti-marking roller 13 is configured such that its roller shaft is parallel to that of the coating roller 11, and its roller surface is in contact with the roller surface of the coating roller 11. It is used to remove the roll markings on the roller surface of the coating roller 12 through contact and relative rotation, restoring the coating surface (i.e., the roller surface) of the coating roller 12. Specifically, the roller coating mechanism 10 provided in this application includes multiple anti-marking rollers 13, such as two or three anti-marking rollers 13; simultaneously, the anti-marking rollers 13 are soft rollers.

[0034] The texture-reducing roller 13 can be a structure in which a roller body made of materials such as ethylene propylene rubber (EPDM), neoprene rubber, hyperalone rubber, nitrile rubber, silicone rubber, polyurethane rubber, and butyl rubber is appropriately covered on the roller shaft. The hardness of its roller body is measured to be 20-30 degrees according to a Shore hardness tester, for example, around 25 degrees.

[0035] Compared to the coating roller 11 and the metering roller 12, the anti-marking roller 13 has a smaller diameter, which is 55-65 mm (e.g., 60 mm). Furthermore, although the roller surface of the anti-marking roller 13 is in contact with the roller surface of the coating roller 11, there is a gap B between adjacent roller surfaces of the anti-marking roller 13, which is preferably 18-22 mm (e.g., 20 mm). This is because, since the roller surface of the anti-marking roller 13 is in contact with the roller surface of the coating roller 11, the anti-marking roller 13 is passively rotated by the coating roller 11, and the contact and relative rotation between the two eliminate the roll markings on the roller surface of the coating roller 11. Here, because the anti-marking roller 13 is passively rotated by the coating roller 11, the anti-marking roller 13 is also configured as a reversing roller. Based on this, the gap between the roller surfaces of adjacent anti-marking rollers 13 facilitates the reversal of the anti-marking roller 13.

[0036] In addition, the anti-roughness roller 13 is positioned above the coating roller 11 and close to the metering roller 12. Taking the positional relationship of the two anti-roughness rollers 13 as an example, the line connecting the axis of one anti-roughness roller 13 and the axis of the coating roller 11 has an acute angle α1 of 130° with the conveying surface of the roller coater, and the line connecting the axis of the other anti-roughness roller 13 and the axis of the coating roller 11 has an acute angle α2 of 118° with the conveying surface of the roller coater.

[0037] Both ends of the multiple anti-roughness rollers 13 are mounted on a pair of third movable plates via bearings. Preferably, the third movable plates move in tandem with the first movable plate, for example, the third movable plates are screwed onto the first movable plate, so that the height of the anti-roughness rollers 13 can be changed accordingly while adjusting the height of the coating roller 11. Alternatively, an arc groove similar to the arc of the coating roller 11 can be formed on the third movable plate, so that the position of the anti-roughness rollers 13 can rotate along the roller surface of the coating roller 11.

[0038] The first movable plate, the second movable plate, and the third movable plate mentioned above are all existing structures and assembly methods.

[0039] In use, the paint supply mechanism 30 supplies paint or other coatings from directly above the gap between the coating roller 11 and the metering roller 12 towards the gap. In some embodiments, the paint supply pipe directly applies the paint or other coating to the gap. In other embodiments, the paint or other coating is first applied to the texture-removing roller 13 closest to the metering roller 12, and then flows along the surface of the texture-removing roller 13 towards the gap. In other words, in this manner, the paint supply mechanism 30 is positioned above the texture-removing roller 13 closest to the metering roller 12. The paint supply mechanism 30 can retain the structure of the paint supply mechanism in existing roller coaters without requiring adaptive modifications.

[0040] In addition, a dust cover can be installed on the mounting plate to prevent dust or other debris from mixing into the paint or other coatings, affecting the paint finish, or causing damage to the roller surface of the texture-removing roller 13.

[0041] In this embodiment, by employing multiple anti-marking rollers 13, particularly since the anti-marking rollers 13 are soft rollers, the roll marks on the coating roller 11 can be eliminated more promptly compared to the structure of a single anti-marking roller or a hard roller in the prior art, thus improving the coating effect. See [link to previous embodiment] for the coating effect before and after the improvement. Figure 3 and Figure 4 As shown in the comparison, Figure 3 The more obvious processing ripples are indicated by red arrows in the text. Figure 4 The painted surface of the workpiece in the process does not have any processing ripples.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A roller coating machine, comprising a roller coating mechanism (10), the roller coating mechanism (10) comprising a coating roller (11), a metering roller (12), and a texture-removing roller (13), wherein the texture-removing roller (13) is configured such that its roller shaft is parallel to the roller shaft of the coating roller (11), and its roller surface is in contact with the roller surface of the coating roller (11); characterized in that, The roller coating mechanism (10) includes a plurality of the texture-removing rollers (13), which are soft rollers.

2. The roller coating machine according to claim 1, characterized in that, The hardness of the main body of the texture-reducing roller (13) is 20-30 degrees.

3. The roller coating machine according to claim 1, characterized in that, The metering roller (12) is positioned on one side of the coating roller (11), and the texture-removing roller (13) is positioned above the coating roller (11) and close to the metering roller (12).

4. The roller coating machine according to claim 3, characterized in that, According to the conveying direction (x) of the roller coater, the metering roller (12) is positioned in front of the coating roller (11).

5. The roller coating machine according to claim 1, characterized in that, The diameter of the texture-removing roller (13) is 55-65 mm.

6. The roller coating machine according to claim 1, characterized in that, There is a gap between the roller surfaces of adjacent anti-roughness rollers (13).

7. The roller coating machine according to claim 6, characterized in that, The gap between the roller surfaces of adjacent anti-roughness rollers (13) is 18-22 mm.

8. The roller coating machine according to claim 1, characterized in that, The texture-removing roller (13) is passively rotated by the coating roller (11).

9. The roller coating machine according to claim 1, characterized in that, The roll coating mechanism includes two of the texture-removing rollers (13).

10. The roller coating machine according to claim 9, characterized in that, The line connecting the axis of one of the anti-roughness rollers (13) and the axis of the coating roller (11) has an acute angle of 128-132° with the conveying surface of the roller coater, and the line connecting the axis of the other anti-roughness roller (13) and the axis of the coating roller (11) has an acute angle of 115-120° with the conveying surface of the roller coater.

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