JPH0257501B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a decoration method that can obtain decorative plywood with rich design properties, and involves forming a pattern layer made of transparent thermosetting resin on a wooden base material, Then, by forming a resin layer and subjecting it to heat-pressure treatment, the degree of impregnation of the resin layer into the wooden base material is controlled by the pattern layer, so that a pattern rich in three-dimensionality and the like can be obtained.

[Prior art]

Traditionally, this type of decorative plywood has been decorated by applying an undercoat or painting directly to the base plywood, then forming a wood grain pattern by screen printing or gravure offset printing, and then applying alkyd,
It is known that a transparent paint such as polyester paint is applied.

[Problem that the invention seeks to solve]

However, with this kind of decoration method,
The resulting pattern was flat, lacked a three-dimensional effect, and was monotonous in color, making it impossible to create a deep design.

[Means for solving the problem] Therefore, in the present invention, a pattern layer made of a transparent thermosetting resin is first formed on a wooden base material, a resin layer is formed on this, and then a heat pressure treatment is performed. A pattern with a shape determined by the pattern layer is formed inside the wooden base material, and a pattern rich in color, three-dimensionality, wood grain, etc. is formed.

FIGS. 1 to 3 show an example of the decorating method of the present invention in the order of steps, and reference numeral 1 in the figures represents a wooden base material. This wood base material 1 includes decorative veneers such as natural wood veneers and artificial wood veneers, decorative plywood with these decorative veneers attached, decorative veneers lined with non-woven fabric, natural wood bare boards, etc. Those with a ground surface, or those with an arbitrary color tone after grinding, are used. However, when applying coloring, use a coloring agent that contains resin or a coloring agent that does not contain resin that cannot prevent resin impregnation during hot press, and use a coloring agent that does not contain resin to prevent the wood substrate 1 from being colored in the subsequent process.
It is necessary to prevent resin impregnation.

First, a pattern layer 2 is formed on the surface of this wooden base material 1, as shown in FIG. This pattern layer 2 is made of a transparent or colored transparent thermosetting resin, and using an ink or paint made of this thermosetting resin, a printing method such as screen printing or gravure printing, or a painting method such as a masking spray method is used. A desired design or pattern is formed on the base material 1 by a method such as the following method, and the material is dried or heated to solidify under normal pressure. The degree of hardening of the thermosetting resin of the pattern layer 2 is not limited to complete hardening, but may be semi-hardened, and by adjusting this degree of hardening, the pattern obtained can be varied. It is also preferable to partially change the degree of curing of the resin because a special pattern can be obtained. The thickness of the pattern layer 2 is approximately 5 to 100 μm. Thermosetting resins include, but are not limited to, urethane resins, epoxy resins, polyester resins, and amino resins such as phenol resins and melamine resins.
It is not limited to liquid form and may be powder form. In principle, the pattern layer 2 is preferably not impregnated into the inside of the wooden base material 1, and in that sense, it is desirable to solidify without applying any particular pressure.

Next, as shown in FIG. 2, a resin layer 3 is formed on the pattern layer 2. This resin layer 3 is made of wood base material 1
It is provided over the entire surface and completely covers the pattern layer 2. The resin forming the resin layer 3 may be either thermoplastic or thermosetting, and may be in liquid or powder form, and may be transparent, colored transparent or semi-transparent so that the pattern on the surface of the underlying wooden base material 1 can be seen through. It is preferable to use a material with a low melt viscosity that allows it to penetrate and impregnate the wood substrate 1 well during the next step of heat-pressure treatment. Specifically, powder resins such as epoxy resin, epoxy polyester resin, epoxy phenol resin, acrylic urethane resin, ethylene-vinyl acetate copolymer, and cellulose acetate butyrate (CAB) are suitable. In addition, in the case of powder resin, this resin layer 3 is adhered onto the base material 1 by an electrostatic coating method or a spraying method, and is melted in a heating furnace such as a far-infrared heating furnace and placed on the base material 1. In the case of a liquid resin, a method is adopted in which it is deposited on the base material 1 using a common coating device such as a roll coater, and the solvent is evaporated as necessary. The thickness of this resin layer 3 is usually 50 to 300 μm.

Next, the whole is subjected to heat and pressure treatment using a hot press or the like to form the resin layer 3 into a coating film as shown in FIG.
Impregnate inside. This heat and pressure treatment condition is as follows:
The temperature must be higher than the melting temperature of
For good impregnation with the molten resin, a moderate pressure is required, and the specific pressure varies depending on the type of resin forming the resin layer 3, but usually the temperature is 100 to 140.
℃, pressure is set in the range of 0.1~1MPa. During this heat and pressure treatment, it is necessary to place a release film such as a polypropylene resin film or a vinyl fluoride resin film on the resin layer 3. Also,
If the resin forming the resin layer 3 is a thermosetting resin, it can be processed by hot-hot pressing, and if it is a thermoplastic resin, it can be processed by hot-cold pressing. Resin, such as epoxy polyester resin using polyester resin as a curing agent, can be said to be the most suitable resin layer 3 because it has quick hardening properties.

[Effect]

In such a decorating method, the resin of the resin layer 3 is heated and melted during the heat-pressure treatment, and since the pattern layer 2 is made of a thermosetting resin, it is not melted and remains as it is. Therefore, the patterned layer 2 acts as a barrier, and the molten resin penetrates into the base material 1 in the portion other than the patterned layer 2, so that the base material 1 is partially impregnated with the resin. In this way, a resin-impregnated part corresponding to the pattern of the pattern layer 2 is formed, and the transparency of this resin-impregnated part is improved, and since the part corresponding to the pattern layer 2 is hardly impregnated with molten resin, there is no change in transparency. The pattern of the pattern layer 2 is formed due to the difference in transparency, and the pattern of the pattern layer 2 is transferred and appears to stand out, thereby forming a decorative pattern rich in a very unique three-dimensional effect. At this time, if the pattern layer 3 is in a semi-cured state, some portions of the pattern layer 3 are also impregnated with the resin, the transparency changes in multiple stages, and the resulting decorative pattern changes.

FIG. 4 shows the appearance of decorative plywood obtained by such a decoration method. In this product, a triangular and circular pattern layer 2 is formed, and the triangular and circular patterns stand out and can be visually recognized in three dimensions.

〔Example〕

Hereinafter, the present invention will be specifically explained with reference to Examples.

(Example 1) A 0.3 mm maple veneer was attached to a 2.5 mm plywood, and the surface was ground and colored with a dye alcohol solution.
Next, using transparent urethane resin, a bird's eye pattern layer (thickness
10 μm) and dried under normal pressure. Powder epoxy polyester resin (100 mesh passes) on top of this
150 g/m ² in basis weight, fused in a far-infrared furnace, sandwiched with release film, and hot pressed.
Heat and pressure treatment was performed at 140°C, 1.0 MPa, and 30 minutes.

The resulting decorative plywood had a bird's-eye pattern that was close to the real thing, with a large amount of resin being impregnated in the areas where there was no pattern layer, and the bird's eye pattern of the pattern layer standing out.

(Example 2) After grinding the surface of a 10 mm spruce material with #280 sandpaper, triangular and circular patterns were attached using a screen printing method using transparent urethane resin, and dried under normal pressure to form a film with a thickness of 50 μm. A patterned layer was formed. On top of this, 150 g/m ² of powdered epoxy phenol resin (100 mesh pass) was applied and melted and fused in a far-infrared furnace. When this was sandwiched between release films and subjected to heat and pressure treatment at 140° C. and 1.0 MPa for 20 minutes, a decorative plywood having a three-dimensional pattern in which the triangles and circles of the pattern layer stood out was obtained.

(Example 3) In Example 2, a red transparent urethane resin and a blue transparent urethane resin were used instead of the transparent urethane resin, and a pattern layer was formed with the red transparent urethane resin for the triangle and the blue transparent urethane resin for the circle. , it appeared as if a red triangle and a blue circle were inlaid.

(Example 4) In Example 2, 150 g/m ² of ethylene-vinyl acetate copolymer powder was sprinkled instead of the powdered epoxy phenol resin, and heat-pressure treatment was performed as it was using a hot roll press at 130°C. The obtained decorative plywood similarly had the appearance of three-dimensional triangular and circular shapes.

(Example 5) In Example 2, the triangular and circular patterns were masked with tape, and the other parts were coated with transparent urethane resin paint and dried to form a pattern layer with a film thickness of 10 μm. When treated in the same manner as in Example 2, the molten resin impregnated the triangular and circular patterned portions, making the triangular and circular portions appear concave, giving a three-dimensional appearance.

〔Effect of the invention〕

As explained above, in the decoration method of the present invention, a pattern layer made of a transparent thermosetting resin is formed on a wooden base material, and then the resin layer is formed and then subjected to heat-pressure treatment. Since the base material is not impregnated with the molten resin, the transparency of the base material changes, and as a result, the part of the pattern layer stands out, making it possible to form a three-dimensional pattern.

[Brief explanation of the drawing]

Figures 1 to 3 are schematic sectional views showing an example of the decorating method of the present invention in the order of steps, and Figure 4 is a perspective view showing the appearance of decorative plywood obtained by the decorating method of the present invention. It is a diagram. 1...Wood base material, 2...Pattern layer, 3...Resin layer.

Claims (1)

[Claims] 1. A method for decorating decorative plywood, which comprises forming a pattern layer made of a transparent thermosetting resin on a wooden base material, then forming a resin layer, and then subjecting the resin layer to heat-pressure treatment.