JPH0434460B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is directed to the production of a textured decorative sheet with an extremely rich wood texture, which has concave portions on the surface of a colored thermoplastic sheet that are completely in sync with the conduit groove pattern of the underlying wood grain pattern. It is about law.

<Prior art and its problems> Various wood-grain decorative sheets have been proposed in which concave conduit grooves are formed on a thermoplastic sheet. It was something I couldn't do.

Later, the recesses and their coloring were synchronized, and a material with a woody feel was proposed in Japanese Patent Publication No. 14312/1983, and the so-called wiping method was established.

However, strictly speaking, this is just the bottom of the embossed pattern being colored, and in that respect it is certainly the same, but is it really the position of the original conduit part of the wood grain pattern and the position of the embossed conduit part? It cannot be said that they are completely in sync.

In other words, even if the embossing plate is made from the same original as the wood grain pattern on the base, the thermoplastic sheet, which has a high degree of thermal expansion and contraction, requires a printing process that does not apply much heat and high-temperature heating, and will not stretch in the length direction. Considering the difference in production conditions for embossing during the doubling process, which shrinks in the width direction, it is extremely difficult to perform embossing that perfectly matches the position of the conduit where the woodgrain pattern in printing should be. is clear.

On the other hand, various textured decorative materials based on suction paper have been proposed, but due to the nature of the base material, the effects of additives cannot be fully demonstrated in any of them.
In many cases, it is simply a visual change in gloss, and even if the specification lists film in addition to paper,
This is just a comprehensive list and does not mention which base material should be used to achieve the desired effect.

<Means for Solving the Problems> In view of the above, the present inventor printed a desired wood grain pattern on the surface of a colored thermoplastic sheet without suction, in order to fully utilize the effects of the additives described below. The ink that prints only the conduit groove pattern is mixed with a matting agent that emphasizes the matte state of the conduit, an additive that gives the bottom surface of the recesses a rough texture, and a liquid repellent that repels the resin liquid that will be used as a surface coating to form the recesses. By applying a thick layer of transparent synthetic resin over the entire surface, it has an extremely wood-like texture with colored concave areas that perfectly match the desired wood grain pattern, and is also suitable for use as construction and furniture materials. This led to the invention of a method for manufacturing decorative sheets that can withstand use.

<Function> Here, Japanese Patent Publication No. 57-7915 describes a method for manufacturing a decorative sheet in which a matting agent and a liquid repellent are mixed into conduit groove ink, and Japanese Patent Publication No. 56-214094 similarly describes a method for manufacturing decorative sheets using inorganic hollow particles. The decorative materials that are mixed in are disclosed, but although the former expresses conduit grooves with concavities and changes in gloss, as mentioned above, the base material is paper, so the effect of the additive is weak, and some In other words, it is an expression of gloss difference rather than unevenness, and it lacks the texture of unevenness and wood texture, and in the latter case, although the conduit grooves are rough, there is also a surface resin layer in those areas. Therefore, visually, it is far from comparable to conduit grooves made of natural materials.

In the decorative sheet formed according to the present invention, the conduit groove portion is printed with an ink containing an organic fiber powder, a matting agent, and a liquid repellent in ordinary ink,
Since the base sheet is a thermoplastic sheet that does not absorb suction, the effect of the additives in the ink used to print the conduit grooves works well without decreasing the effect, and later by applying synthetic resin paint to the entire surface, the conduit grooves can be printed. The paint on top will be repelled and the conduit groove will be exposed.
Combined with the roughness of the bottom of the recess caused by the organic fibers and the effect of the matting agent, it has a conduit groove pattern that closely resembles natural wood both visually and to the touch. This results in a finish that is more faithful to natural wood.

That is, the wood grain pattern and the conduit groove pattern must perfectly match, the bottom of the conduit groove recess must have a look and feel that closely resembles natural wood due to the synergistic effect of the organic fiber powder and the matting agent, and It provides an excellent decorative sheet that conventional thermoplastic sheets do not have, as it has a thick layer of synthetic resin applied to the parts and can withstand practical use.

The liquid repellent used in this invention may be conventionally known liquid repellents such as silicone and wax.

As an additive to give a feeling of roughness,
The specific gravity, shape, and size of the particles matter,
Those having a particle size of 15μ or more are preferable.

Glass beads and shirasu balloons, which are well known as hollow particles, can be considered, but in consideration of ink dispersion, precipitation, and abrasiveness, softer fiber powders such as cellulose powder, wood flour, and cotton powder, which have a lower specific gravity, are recommended. It is valid.

Here, it is possible to increase the size of the particles of conventional matting agents in order to obtain a rough feeling, but the specific gravity is large and the dispersibility is poor, more precipitation occurs, and the masking power makes the particles cloudy. In addition, due to the hardness of the conduit grooves, the doctor blade becomes difficult to cut during gravure printing, causing doctor streaks on the printed matter and the doctor blade easily damaging the plate.

On the other hand, fiber powder has a low specific gravity, does not cloud the ink, and is soft, so that the above-mentioned disadvantages are unlikely to occur, and it is of great significance as an additive for obtaining a rough texture.

Such fiber powder is preferably added in an amount of 10 to 30% by weight based on the ink.

In this invention, the thermoplastic sheets used include polyvinyl chloride, polypropylene,
Sheets of polyethylene, polystyrene, etc. are suitable.

<Examples> The present invention will be explained below using examples. Thickness
A normal wood grain pattern was printed on a 1.6 m/m colored vinyl chloride resin sheet using the gravure printing method using the following blended ink 1, and then a conduit groove pattern that matched the wood grain pattern was printed using blended ink 2. Next, 20 g/m ² of top coat of formulation 3 was applied and dried to obtain a decorative sheet.

Compounded ink 1 Vinyl chloride-vinyl acetate copolymer resin 10 parts Colored pigment 15〃 Solvent 75〃 Compounded ink 2 Vinyl chloride-Vinyl acetate copolymer resin 7 parts Colored pigment 5 parts Wood powder (fiber powder) 20〃 Silicone (liquid repellent) ) 3〃 Wax (liquid repellent) 2〃 Silica (matting agent) 10〃 MEK (solvent) 35〃 Toluene (solvent) 15〃 Ethyl acetate (solvent) 10〃 Top coat urethane resin 50 parts silicone 0.5〃 Hardening agent 10〃 Solvent 39.5〃 <Effects of the Invention> In the decorative sheet obtained above, the wood grain pattern and the conduit groove pattern with roughness at the bottom of the recesses are completely synchronized, and the recesses repel the surface resin and have a matte appearance. It had a look and feel that closely resembled natural wood, and because it had a thick coat of paint applied to areas other than the conduit grooves, it was sufficiently durable for practical use.

Claims (1)

[Claims] 1 A wood grain pattern is applied on a colored thermoplastic sheet using ordinary printing ink, and then a conduit groove pattern is printed on it using printing ink mixed with fiber powder, a matting agent, and a liquid repellent, and then a thick A method for producing a decorative sheet characterized by applying a transparent synthetic resin layer.