A method of painting a board

Abstract

The present application relates to the technical field of wood board coating process, and discloses a paint finishing method for a board, the surface of the board has a mechanical way of processing formed texture, the paint finishing method sequentially includes the steps of texture coloring, plane coloring, texture modification and topcoat coating; in the step of texture coloring, the surface of the board is coated with water-based paint, and after the coating is dried, part of the coating formed on the plane of the board is removed by sanding to retain part of the coating formed in the texture; in the step of texture modification, a second paint is continuously coated on the surface of the board using a brush roller group, the brush roller group includes a brush roller group frame, a steel roller with a mesh pattern and a brush roller. After the board is coated using the method, a paint finishing effect of retaining the three-dimensional sense of the concave-convex texture on the surface of the board can be obtained, and the dimensional stability of the board can be improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of wood board coating process, in particular to a paint finishing method of board, and more particularly to a board with mechanical processed concave-convex lines on the surface. BACKGROUND

[0002] It is a common surface decoration treatment method to form various patterns and concave-convex lines on the surface of wood board by mechanical processing, for example, forming radial wire drawing lines by wire drawing process to remove early wood part on the surface of wood board, or forming wood-like radial lines by pressing steel plate or steel roller.

[0003] In the prior art, the paint finishing methods for the board with concave-convex lines on the surface include open paint and closed paint. The open paint refers to paint finishing only on the planar part of the board, and the paint effect of the planar part increases the three-dimensionality of the concave-convex lines. However, the concave part of the lines of the paint finished board has no paint, and the concave part of the lines is mostly the opening of the tube hole, so the concave part of the lines is more likely to absorb moisture from the environment or cause the loss of moisture in the wood, in other words, the paint finished board is more likely to be affected by the temperature and humidity of the environment, and the dimensional stability is poor. Although the closed paint cuts off the channel for the exchange of moisture between the wood and the environment due to the full sealing of the paint, it weakens the three-dimensionality of the concave-convex lines from the visual aspect, and the decoration effect is relatively poor.

[0004] In summary, there is a lack of a paint finishing method in the prior art which can both retain the three-dimensionality of the concave-convex lines on the surface of the board and close the channel for the exchange of moisture between the wood and the environment. SUMMARY

[0005] To achieve the above technical purpose, one aspect of the present application provides a paint finishing method of board, the surface of the board has mechanical processed lines, and the paint finishing method sequentially includes the steps of line coloring, planar coloring, line modification, and topcoat application.

[0006] In the line coloring step, water-based paint is applied to the surface of the board, and after the coating layer is dried, part of the coating layer formed on the planar surface of the board is removed by sanding to retain part of the coating layer formed in the lines.

[0007] In the planar coloring step, the surface of the board is continuously coated with first paint, and the coating amount of the first paint is 25-30 g / m 2 ;

[0008] In the line modification step, the surface of the board is continuously coated with second paint using a brush roller set, and the brush roller set includes a brush roller set frame, a textured steel roller, and a brush roller.

[0009] In the topcoat coating step, a third paint is continuously coated on the surface of the board, and then the board is passed through at least a UV curing lamp group to cure the third paint.

[0010] As a preferred embodiment, in the planar coloring step, the first paint is coated using a rubber roller group, which includes a rubber roller group frame, a flat steel roller, and a rubber roller with a hardness of 35°; in the topcoat coating step, the third paint is coated using a soft rubber roller group, which includes a soft rubber roller frame, a flat steel roller, and a soft rubber roller with a hardness of 20°.

[0011] As a preferred embodiment, in the planar coloring step, the first paint is coated first, and then the board is sequentially passed through an infrared tunnel and a UV curing lamp group to cure the first paint; finally, the first paint is coated again or a fourth paint is coated.

[0012] As a preferred embodiment, in the planar coloring step, when the first paint is coated again or the fourth paint is coated, a soft rubber roller group is used; the first paint is a UV paint, and the fourth paint is an excimer paint.

[0013] As a preferred embodiment, in the planar coloring step, when the first paint is coated again or the fourth paint is coated, the coating amount of the paint is 30-35 g / m 2 .

[0014] As a preferred embodiment, the planar coloring step is repeated once or twice.

[0015] As a preferred embodiment, in the texture modification step, the second paint is coated using two sets of the brush roller group, which are symmetrically arranged with an interval and the screen steel rollers are located on the inner side, and the screen steel rollers of the two sets are rotated in opposite directions.

[0016] As a preferred embodiment, the board, on which thickness sanding and tonguing and grooving have been completed, is pressed by a textured steel roller with a positive texture on the surface, and the texture with a negative texture is formed on the surface of the board after the pressing.

[0017] As a preferred embodiment, when passing through the textured steel roller, the feeding speed of the board is 2.5-3.5 m / min; and the depth of the texture formed after the pressing is 0.3-0.8 mm.

[0018] As a preferred embodiment, after pressing, the surface of the plate is polished using a steel wire roller, when the width of the lines is 0.3-0.5mm and / or the depth is 0.3-0.5mm, a steel wire roller with 0.4-0.5mm Dupont wire is used for polishing; when the width of the lines is 0.5-0.8mm and / or the depth is 0.5-0.8mm, a steel wire roller with 0.6-1.0mm Dupont wire is used for polishing.

[0019] In summary, after the plate with lines on the surface is coated using the paint finishing method disclosed in the present application, the paint finishing effect of retaining the three-dimensional sense of the concave-convex lines on the surface of the plate can be obtained, and the paint finishing method of closing the channel for water exchange between the wood and the environment can improve the dimensional stability of such plate. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 A structural schematic diagram of a brush roller set of Embodiment 1 of the present application.

[0022] Figure 2 A photo of the paint finishing effect of the plate of Embodiment 2 of the present application.

[0023] In the figure: 100, brush roller set, 110, rack, 120, textured steel roller, 130, brush roller, 140, paint pipe, 150, scraper, 500, plate. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0025] Embodiment 1: The embodiments of the present application disclose a paint finishing method for plate, which is particularly suitable for plate with various patterns and lines on the surface formed by mechanical processing, such as weathered plate with radial wire lines formed by taking out early wood part through wire drawing process, 3D embossed plate with wood-like radial lines formed by pressing steel plate or steel roller, etc.

[0026] The paint finishing method comprises, in sequence, (1) a step of coloring the grain, (2) a step of coloring the plane, (3) a step of grain modification, and (4) a step of topcoat application. The technical term "topcoat" used in the step of topcoat application herein refers to the paint on the most surface, which is slightly different from the concept of "topcoat" and "primer" in the traditional concept.

[0027] In the step of coloring the grain, two groups of sponge roller sets are used to apply water-based paint on the surface of the board. The sponge roller set is a prior art, which comprises a frame, a flat steel roller and a sponge roller. The water-based paint used is a prior art, which has a solid content of 15-20%. The board is dried in an infrared tunnel to dry the coating formed by the water-based paint, and after the coating is dried, part of the coating formed on the plane of the board is removed by sanding to retain part of the coating formed in the grain.

[0028] The step of coloring the grain is suitable for forming color in the grain of the board, and improving the three-dimensional effect of the board after paint finishing by increasing the contrast between the plane area and the grain area.

[0029] In the step of coloring the plane, a group of rubber roller sets is used to continue applying the first paint on the surface of the board. The rubber roller set is a prior art, which comprises a frame, a flat steel roller and a rubber roller, and in particular, the hardness of the rubber roller is 35°. The first paint is a prior art UV paint, and the application amount is 25-30 g / m 2 , for example 27±0.2 g / m 2 . After the application of the first paint is completed, the step of (3) grain modification is directly implemented without drying or curing the first paint.

[0030] The purpose of using a harder rubber roller is to control and reduce the application amount of the paint, and when the single application amount is in the range of 25-30 g / m 2 , the coloring treatment of only the plane part of the surface of the board can be basically achieved. Through the treatment and process parameters design of steps (1) and (2), the coloring and painting treatment in the plane area and the grain of the board surface can be independent of each other. The additional benefit of the independent coloring and painting treatment in the plane area and the grain is that it can avoid excessive deposition of UV paint in the grain, which makes the grain shallow and affects the three-dimensional effect of the board after paint finishing.

[0031] Reference Figure 1As shown, in the step of (3) texture modification, a second paint is continuously applied on the surface of the board using a brush roller set 100. The brush roller set 100 includes a frame 110 of a coating machine in the prior art (e.g. the same frame is used with a sponge roller set or a rubber roller set) and a steel anilox roller 120 and a brush roller 130 abutting at their edges. The steel anilox roller 120 is a steel roller with a concave grid pattern on its surface and the brush roller 130 is a roller with a brush body made of glass fiber filaments. A paint pipe 140 applies the second paint on the surface of the steel anilox roller 120 and the excess second paint is accumulated on the blade surface of a doctor blade 150 while only the concave grid pattern of the steel anilox roller 120 is filled with the second paint. As the steel anilox roller 120 rotates and abuts with the brush roller 130 at their edges, the brush roller 130 can brush the second paint in the concave grid pattern away to carry the second paint on the brush body so that the brush roller 130 is in a wet state. When the board 500 passes through the brush roller 130 in the wet state, the brush roller 130 can uniformly apply the second paint on the planar area of the surface of the board and also brush the second paint into the texture while avoiding the problem of making the texture shallow.

[0032] As a preferred embodiment, two brush roller sets 100 are used to apply the second paint in the step of texture modification. The two brush roller sets 100 are symmetrically arranged at intervals with the steel anilox roller 110 inside and the steel anilox rollers 110 of the two brush roller sets 100 rotate in opposite directions. The pair of brush rollers 130 rotating in opposite directions can make the brushing of the second paint in the planar area and the texture more uniform.

[0033] The second paint can be a UV paint, but preferably, the second paint is an excimer paint in the prior art. After the application of the second paint is completed, the step of (4) topcoat application is directly implemented without drying or curing the second paint.

[0034] By the step of (3) texture modification, the UV paint or the excimer paint is applied but not filled in the texture to isolate the wood in the texture from the moisture exchange with the outside so as to improve the dimensional stability of the board while avoiding the problem of making the texture shallow to affect the three-dimensionality.

[0035] In the step of (4) topcoat application, a third paint is continuously applied on the surface of the board using a soft rubber roller set and then the board is passed through at least a UV curing lamp set to cure the third paint. The soft rubber roller set is in the prior art and includes a frame, a flat steel roller and a soft rubber roller, and in particular, the hardness of the soft rubber roller is 20°. The third paint can be a UV paint, but preferably, the third paint is an excimer paint in the prior art. When the excimer paint is selected as the third paint, the board on which the step of topcoat application is completed should be passed through an excimer curing lamp set and a UV curing lamp set to cure the third paint. The application amount of the third paint should be controlled within 35 g / m 2 .

[0036] Example 2: The difference between Example 2 and Example 1 is that in the step of (2) flat color, a set of rubber roller groups is used to continue coating the first paint on the surface of the board; then the board is sequentially passed through an infrared tunnel and a UV curing lamp group to cure the first paint; finally, a set of soft rubber roller groups is used to coat the first paint again, and the amount of the second coating of the first paint is 30-35 g / m 2 After the second coating of the first paint is completed, no drying or curing operation is performed on the layer of the first paint in order to connect with the step of (3) texture modification.

[0037] Example 3: The difference between Example 3 and Example 1 is that in the step of (2) flat color, a set of rubber roller groups is used to continue coating the first paint on the surface of the board; then the board is sequentially passed through an infrared tunnel and a UV curing lamp group to cure the first paint; finally, a set of soft rubber roller groups is used to coat the fourth paint, and the fourth paint is a quasi-molecular paint, and the amount of coating is 30-35 g / m 2 After the coating of the fourth paint is completed, no drying or curing operation is performed on the fourth paint in order to connect with the step of (3) texture modification.

[0038] Example 4: The difference between Example 4 and Example 3 is that the step of flat color is repeated once or twice.

[0039] Example 5: The difference between Example 5 and Example 4 is that the board on which at least the thickness sanding and the tongue and groove are completed is passed through a textured steel roller with a positive texture on the surface and is pressed by the textured steel roller, and after the pressing, a negative texture is formed on the surface of the board. The positive texture on the surface of the textured steel roller is a leather wrinkle texture, so that a texture simulating the leather wrinkle is formed on the surface of the board.

[0040] When passing through the textured steel roller, the feeding speed of the board is 2.5-3.5 m / min (for example, 3 m / min); and the depth of the texture formed after the pressing is 0.3-0.8 mm (preferably 0.5 mm).

[0041] Although increasing the moisture content of the board or making the embossing roller have a higher temperature can make the surface of the board be pressed in a softened state, it can also cause the following problems: (1) micro-carbonization of the surface of the board, thereby affecting the initial material color of the board; and (2) for the board with a higher oil content, it can cause the oil to overflow, thereby affecting the sanding and painting performance of the surface of the board. Therefore, under the condition that the board is in a low moisture content state (for example, 12-16%) and the embossing roller is at room temperature, the embossing obtained by pressing inevitably has burrs. The present embodiment overcomes this problem by using a steel wire roller to polish the surface of the board. In particular, when the width of the embossing is 0.3-0.5 mm and / or the depth is 0.3-0.5 mm, a steel wire roller with 0.4-0.5 mm DuPont wire is used for polishing; when the width of the embossing is 0.5-0.8 mm and / or the depth is 0.5-0.8 mm, a steel wire roller with 0.6-1.0 mm DuPont wire is used for polishing.

[0042] Referring to Figure 2 As shown in the above, the paint finishing method of the present application is applied to the surface of the board with embossed lines imitating leather wrinkles, and a leather-imitating paint finishing effect can be obtained. Since the leather effect is obtained by paint coating on the surface of the board, it overcomes the environmental and stability problems caused by pasting leather on the surface of the board.

[0043] The above description is for illustration purposes only and is not intended to be limiting. Many implementations and many applications other than the examples provided would be apparent to those of ordinary skill in the art from the above description. The scope of the present teachings should not be limited to the examples described above but should be given the full scope of the appended claims and any equivalents thereof. For purposes of completeness, all articles and references including patents and patent documents are incorporated herein by reference. The disclosure of any patent application or other document referenced herein is incorporated by reference in its entirety, for all purposes. Any aspect of the subject matter disclosed herein that is not recited in the claims is hereby abandoned.

Claims

1. A method for painting a board, characterized in that, The surface of the board has textures formed by mechanical processing, and the painting method includes, in sequence, the steps of coloring the texture, coloring the surface, modifying the texture, and applying the topcoat. In the step of coloring the texture, water-based paint is applied to the surface of the board, and after the coating dries, the portion of the coating formed on the flat surface of the board is removed by sanding while the portion of the coating formed in the texture is retained. In the step of applying color to the flat surface, a first coat of paint is applied to the surface of the substrate, with a coating amount of 25-30 g / m². 2 After the first coat of paint is applied, the texturing step is carried out directly without drying or curing the first coat of paint. In the texture modification step, a second paint is applied to the surface of the board using a brush roller assembly. The brush roller assembly includes a brush roller frame, an anilox steel roller, and a brush roller with their edges abutting each other. The anilox steel roller is a steel roller with a concave grid pattern on its surface, and the brush roller is a roller with a brush body composed of glass fiber filaments. The paint tube sprays the second paint onto the surface of the anilox steel roller. As the anilox steel roller rotates, excess second paint accumulates on the blade of the scraper, while only the concave grid pattern of the anilox steel roller is filled with the second paint. With the rotation of the anilox steel roller and its positional relationship with the edge of the brush roller, the brush roller can brush away the second paint in the concave grid pattern so that the brush body carries the second paint and the brush roller is in a wet state. In the topcoat application step, a third paint is applied to the surface of the board, and then the board is cured at least by a UV curing lamp assembly to cure the third paint. In the step of applying the surface color, a rubber roller assembly is used to apply the first paint. The rubber roller assembly includes a rubber roller assembly frame, a flat steel roller, and a rubber roller, and the hardness of the rubber roller is 35°. In the step of applying the topcoat, a soft rubber roller assembly is used to apply the third paint. The soft rubber roller assembly includes a soft rubber roller frame, a flat steel roller, and a soft rubber roller, and the hardness of the soft rubber roller is 20°.

2. The method for painting a sheet metal according to claim 1, characterized in that, Repeat the coloring process on the plane once or twice.

3. The method for painting a sheet metal according to claim 1, characterized in that, In the texture modification step, the second paint is applied using two sets of brush rollers. The two sets of brush rollers are symmetrically arranged at intervals with the anilox steel roller located on the inner side, and the anilox steel rollers of the two sets rotate in opposite directions.

4. The method for painting a sheet metal according to claim 1, characterized in that, The sheet material, which has undergone at least fixed-thickness sanding and tongue-and-groove processing, is pressed by an embossing steel roller with positive patterns on its surface. After pressing, the patterns are formed on the surface of the sheet material, and the patterns are negative patterns.

5. The method for painting a sheet metal according to claim 4, characterized in that, When the plate passes through the embossing steel roller, the feeding speed of the plate is 2.5~3.5m / min; the depth of the texture formed after pressing is 0.3~0.8mm.

6. The method for painting a sheet metal according to claim 4, characterized in that, After pressing, the surface of the sheet is polished using a wire roller. When the width of the texture is 0.3~0.5mm and / or the depth is 0.3~0.5mm, a wire roller with 0.4~0.5mm DuPont filaments is used for polishing; when the width of the texture is 0.5~0.8mm and / or the depth is 0.5~0.8mm, a wire roller with 0.6~1.0mm DuPont filaments is used for polishing.

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