JPH0257019B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for decorating wood decorative laminates, and relates to a method for decorating wood decorative boards, and the present invention relates to a method for decorating wood decorative boards. By arranging the resin and performing heat-pressure treatment, the pressure during heat-pressure treatment can be varied unevenly within one sheet of natural wood decorative material, and the degree of impregnation of the resin into the natural wood decorative material and the degree of compression of the decorative material can be controlled. This allows a deep three-dimensional pattern to be obtained.

``Prior art and its problems'' Conventional methods for decorating wood decorative boards include forming a synthetic resin coating on the surface of the natural wood decorative material or applying resin impregnation treatment, and applying heather on the resin film on the surface. It was only capable of printing film-like wood grain patterns. For this reason, there was little change in appearance as a decoration method, and the three-dimensional effect of the pattern was not as desired.

[Means for solving problems]

Therefore, in the present invention, by disposing a resin film having an uneven pattern on the back side of the decorative material during the heat-pressure treatment for resin impregnation, the pressure applied is uneven, and the degree of resin impregnation and the decorative material are improved. By varying the degree of compression, a deep three-dimensional pattern can be obtained.

This invention will be explained in detail below.

First, prepare a natural wood decorative material. This natural wood decorative material is rosewood with a thickness of about 0.15 to 0.6 mm.
Veneers or veneers of teak, spruce, zelkova, etc., or veneers of these materials dyed in any color are used.

Then, a resin film for impregnation is formed on the surface of this natural wood decorative material. The resin film can be formed by applying and impregnating the surface of the decorative material with a thermosetting resin solution such as unsaturated polyester resin, diallyl phthalate resin, phenol resin, melamine resin, or urea resin, or by impregnating the surface of the decorative material with the above-mentioned powder-cured resin solution. Other conventional methods using powdered resins, such as a method of overlaying a resin-impregnated overlay paper impregnated with a resin-impregnated overlay paper on the surface of the decorative material, may be employed.

This method uses resins such as thermosetting resins such as epoxy resin, unsaturated polyester resin, and thermosetting acrylic resin, and thermoplastic resins such as vinyl chloride resin, styrene resin, and acrylic resin, with particle sizes of
300 μm powder is applied to the surface of natural wood decorative materials at a coating weight of 100 to 300 g/m ² by electrostatic powder coating or drop spraying, heated for a short time at high temperature, and melted. It is welded to the surface of decorative materials while retaining its properties. This method using powdered resin is advantageous in terms of cost because it can be carried out without solvent, and it is also non-polluting and suitable for safety and health, especially for novolak type epoxy resin and bisphenol A type epoxy resin. A fast-curing powder resin prepared by adding an imidazole such as 2-ethyl-4-methyl-imidazole as a curing agent to a mixed epoxy resin is suitable as a powder resin.

Further, the resin film provided on the surface of this natural wood decorative material is colorless and transparent or colored and transparent, so that the wood grain pattern of the decorative material can be visually recognized from the surface.

A backing material is preferably provided on the back side of the natural wood decorative material in order to prevent the decorative material from warping. As the backing material, woven fabrics such as polyester fibers, nylon fibers, acrylic fibers, nonwoven fabrics, paper, etc. are used. For backing, vinyl acetate resin emulsion adhesive, melamine resin,
An amino resin adhesive such as urea resin is used, but it is also possible to weld the above powder resin onto the backing material in the same way and adhere it to the decorative material at the same time during the heat-pressure treatment in the next step. good. The thickness of the backing material is approximately 20 to 200 g/m ² in basis weight.

Furthermore, a resin film having an uneven pattern is disposed on the opposite side of the backing material from the natural wood decorative material. As a method for forming a resin film having an uneven pattern, overlay printing is performed on thin paper or plastic film using a screen printing method. There are those that form an uneven pattern by direct overlay printing on the surface of the backing material, and those that have a thickness of 20~
This is done by cutting small pieces of a 500 μm resin sheet into arbitrary patterns and pasting them on thin paper or plastic film, or directly pasting these small pieces on a backing material. As the resin for forming this resin film, not only thermosetting resins but also thermosetting resins can be used.

Then, as shown in FIG. 1, the natural wood decorative material 1, the resin film 2, the lining material 3, and the resin film 4 having an uneven pattern are overlapped, and these are combined into two sheets with a thickness of 25 cm.
It is inserted with release films 5, 5 such as vinyl fluoride films of about 50 μm in diameter, these are further inserted with two backing plates 6, 6, the cushion material 7 is overlapped, and the mold is placed between the hot plates 8, 8 of the hot press. and heat and pressure treatment.
The conditions for this heat-pressure treatment are appropriately determined depending on the type and thickness of the two resin films 2 and 4 and the natural wood decorative material 1, but for example, when using the mixed epoxy resin mentioned above, the temperature is 120 to 140. ℃, time of 5 to 10 minutes, and pressure of about 0.5 to 2.0 MP. In this case, the selection of pressure is important in obtaining a deep three-dimensional pattern.

After the heat-pressure treatment, if the release films 5, 5 are peeled off, as shown in FIG. 2, the natural wood decorative material 1, the resin film 2,
The backing material 3 and the resin film 4 having an uneven pattern are laminated and integrated to obtain a wooden decorative board 9 decorated with a three-dimensional pattern.

[Effect]

By the above heat-pressure treatment, the resin film 2 on the surface of the natural wood decorative material 1 is once melted, a part of the molten resin penetrates into the decorative material 1 and hardens and solidifies there, and the remaining part hardens on the surface. , solidified to form the surface resin layer 10. Furthermore, due to the presence of the resin film 4 having an uneven pattern, high pressure is applied to the portions where the convex portions are present, and lower pressure is applied to the portions where the concave portions are present. Due to this difference in pressure, the molten resin is deeply impregnated into the natural wood decorative material 1 in the high pressure area, and shallowly impregnated in the low pressure area. Since the resin-impregnated portion of the natural wood decorative material 1 has good transparency, the visible depth from the surface differs between deep and shallow resin-impregnated areas. Further, due to the difference in the pressing force, the degree of squeezing of the natural wood decorative material 1 itself also differs.

For these reasons, when viewed from the surface, a three-dimensional pattern corresponding to the uneven pattern appears, and three-dimensional decoration can be applied.

Furthermore, when the thickness of the natural wood decorative material 1 and the backing material 3 is relatively thin, the color tone of the resin film 4 having the uneven pattern appears slightly on the surface because it is avoided to some extent, and the color tone of the resin film 4 changes. This allows the appearance to be further changed.

The wooden decorative board 9 having the three-dimensional pattern thus obtained is applied to various types of plywood to serve as exterior materials for furniture, musical instruments, etc., and used as is for lampshades and wall materials.

〔Example〕

A spruce veneer with a thickness of 0.2 mm is used as a natural wood decorative material, and 60 parts by weight of novolac type epoxy resin and bisphenol A type epoxy resin are applied to the surface.
A powdered epoxy resin (particle size: 100 mesh pass) consisting of 40 parts by weight of hardening agent and 3 parts by weight of 2-ethyl-4-methyl-imidazole was applied by electrostatic coating to a basis weight of 150 g/ ^m2 , and the temperature was The resin was placed in an infrared oven at 450°C for 20 seconds to melt the resin and fuse it to the veneer.
In addition, a 75 g/m ² vinylon nonwoven fabric was prepared as a backing material, and a pattern having star-shaped convex portions was printed on the surface by screen printing using an epoxy resin-based red printing ink. The ink build-up thickness is approx.
It was 100 μm. Next, this printed nonwoven fabric was attached to the back side of the natural wood decorative material using a urea-vinyl acetate emulsion adhesive so that the printed side was exposed. Next, these were inserted into a release film made of vinyl fluoride film with a thickness of 25 μm, a backing plate of a stainless steel plate with a thickness of 3 mm was applied, and the cushion boards were stacked and inserted between the hot plates of a hot press, and heated at 130°C.
Pressure treatment was performed for 10 minutes at 10 MPa.

The resulting wood decorative board had an appearance with a star-shaped pattern as shown in FIG. 3, due to the difference in the degree of compression of the spruce veneer and the difference in the degree of resin impregnation.

[Effects of the Invention] As explained above, the decoration method of the present invention is to provide a resin film on the surface of a natural wood decorative material, arrange a resin film with an uneven pattern on the back side, and then heat and pressure treat it. Therefore, there is a difference in the degree of resin impregnation into the natural wood decorative material and the degree of compression of the natural wood decorative material itself depending on the uneven pattern, and this difference forms a deep three-dimensional pattern.

Therefore, the wood decorative board decorated by this method has a rich three-dimensional effect, a deep pattern is formed, and it has a luxurious feel.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing how each member is superimposed during heat-pressure treatment in the decoration method of the present invention, and FIG.
The figure is a schematic cross-sectional view of a decorative wooden board obtained by the decorating method of the present invention, and FIG. 3 is a plan view of the decorative wooden board. 1...Natural wood decorative material, 2...Resin film, 4...Resin film having an uneven pattern, 9...Wood decorative board.

Claims (1)

[Claims] 1. A method for decorating wood decorative boards, which is characterized by providing a resin film on the surface of a natural wood decorative material, disposing a resin film having an uneven pattern on the back side, and subjecting these to heat and pressure treatment.