JPS629956A - Manufacture of solid-pattern decorative sheet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to the production of wood grain patterned decorative laminates having fine recesses that match the conduit groove openings like natural wood boards, and decorative laminates having arbitrary fine three-dimensional patterns similar to this. This article relates to a method for manufacturing decorative sheets used for.

vI - Decorative sheets are produced by printing the elegant grain of natural wood onto sheets of paper, and this is then pasted onto boards such as plywood to produce decorative boards with wood grain patterns. ing. And in recent years, sheets with simple planar wood grain patterns have become popular.
1- In addition to printing on the surface, we also imitate the minute depressions that a natural wood board has due to the presence of conduits that open on its surface, resulting in a three-dimensional pattern and a more luxurious woodgrain pattern decorative board. Efforts are being made to do so.

The simplest means of three-dimensionally expressing the conduit grooves is to shape the sheet or its surface coating using a mold or embossing roll. However, this method has the drawback that it is difficult to accurately match the conduit groove portion formed by printing and the recessed portion formed by shaping, and it requires an expensive mold.

A method of shaping the conduit groove concave part without using mechanical means is to add silicone to the ink when printing the conduit groove part, and it is applied to protect the surface after printing the wood grain pattern. There is a method of recessing the conduit groove part so that the transparent paint does not peel off only on the conduit groove part.
458. Tokuko Showa 4.9-884.4. .

Special Publication Showa 52-2641. Special Publication No. 59-7591, etc.). This method is excellent in that it can produce recesses that perfectly match the printed wood grain pattern, but conventional products made using this method have poor thinner resistance in the conduit grooves where surface protection paint does not adhere, and Due to the limitations of (1) and (2) printing, there was a problem that the strength and three-dimensional effect of the conduit groove portion were insufficient.

Invention pi! The present invention is directed to a conventional woodgrain pattern decorative sheet or decorative board obtained by a method that does not form a surface coating film on the conduit groove portion, which has the drawbacks mentioned above. However, one of the objectives is to improve the above-mentioned method so that a product free of such defects can be easily obtained.

The purpose of the present invention is to create a three-dimensional effect by forming concave portions that match a specific pattern without embossing, even on decorative sheets with any abstract or figurative pattern other than the tree 11 pattern. The goal is to make it possible to

The means adopted in the present invention to solve the problem of problem odor (solution 0ζ cedar and 96 hoe-h) is to print a pattern (including printing to express concave parts such as conduit parts) with water-based ink containing metal soap. For example, a wood grain pattern) is printed on the decorative sheet base paper using an ink that does not prevent the penetration of the aqueous resin liquid for strengthening the base paper described later, and the obtained printed base paper is impregnated with the aqueous resin liquid for strengthening the base paper. After drying, a transparent water-based amino resin paint is applied to the printed surface and dried.

Hereinafter, the manufacturing method of the present invention will be explained in detail in the order of steps.

The base paper can be one normally used for producing this type of decorative paper, such as paper containing titanium oxide, and no special paper is required.

The choice of ink for pattern printing is important. First, the ink used to print parts that are intended to be expressed as recesses, such as the conduit grooves, must be made of water-soluble resins that do not get thickened by metal soaps, such as hydroxyalkyl cellulose (such as hydroxypropyl cellulose), polyvinyl alcohol, or polyvinyl alcohol. A water-based ink containing acrylic acid or its derivatives, polyvinylpyrrolidone, casein, etc. as a binder and a metal soap added thereto is used. Preferred metal soaps include stearic acid calcium salts, barium salts, strontium salts, magnesium salts,
These include zinc salts, barium salts of lauric acid, zinc salts, etc. The amount of metal soap in the ink is 10-20%
degree. For printing on areas other than the recessed areas, an ink is selected and used that provides a printing surface that does not impede penetration of the aqueous resin liquid for strengthening the base paper described later. In many cases, preferred inks have binders such as cellulose derivative resins such as cellulose acetate, amino resins, polyvinyl alcohol, polyvinyl butyral, and the like.

Using the above-mentioned ink, printing is performed on the base paper by a conventional method, for example, in a gravure three-print configuration of blurring, patterns, and accents (conduit groove portions).

The aqueous resin solution impregnated to strengthen the obtained printed base paper is suitably one containing a crosslinked acrylic resin, a urea resin, a melamine resin, or two or more thereof. Those containing all three of these components are particularly preferred since they are excellent in terms of reinforcing effect and product flexibility. The impregnation treatment can be carried out by methods such as dipping, spraying, and coating, and the preferred amount of impregnation is 2% as the resin solid content.
It is about 0 to 50%. After finishing the impregnation, heat drying is performed.

Next, a transparent water-based amino resin paint is applied to the printed surface to protect the surface.The paint used here should be one that can form a strong surface protective film. The cohesive force of the metal soap is relatively strong, and in combination with the water repellency of the metal soap, the formation of a coating film is reliably prevented in concave areas such as conduit grooves printed with ink containing metal soap. is preferred. From this point of view, particularly preferred paints contain one or more of melamine resins, urea resins and benzoguanamine resins, or mixtures of these and other resins, such as alkyd resins, as film-forming components. There is something to do.

If this is then heated and dried, it is possible to obtain a decorative sheet in which there is no surface protective coating on the conduit grooves or other areas intended to be expressed as concave areas, and the pattern appears three-dimensional with concave areas.

In the manufacturing method of the present invention, the resin liquid impregnation performed after pattern printing strengthens the entire printed base paper, including the areas intended to be expressed as recesses, and improves its thinner resistance. Also,
The metal soap contained in the ink for printing concave areas does not reliably coat the transparent water-based paint for surface protection even after being impregnated with the resin liquid described in -1-, even if a sufficiently thick coating film is formed. , which prevents coating film formation in areas that should be recessed parts.

Therefore, according to the present invention, the high-quality wood 11 has sufficient strength and thinner resistance, and the printed conduit groove part has a clear depression like the conduit full bloom part of the natural wood board. A patterned decorative sheet or a decorative sheet having a three-dimensional pond pattern can be easily produced.

Bottle Example An oak pattern was printed on colored base paper (80 H/m2) containing titanium oxide in a gravure 3-plate configuration of blur, pattern, and accent (conduit groove portion). In this case, ink A below was used for printing the blur and pattern, and ink B below was used for printing accents.

Ink A: Cellulose acetate 2.5 parts Modified melamine resin 2.5 parts Pigment 15 parts Solvent (MEK + methyl cellosolve) 851'flS Ink B: Hydroxypropyl cellulose 10 parts Barium stearate 12 parts Pigment 10 parts Water 40 parts Isopropanol + 28 parts of ethyl cellosolve Next, a 3-component mixed aqueous resin solution of cross-linked acrylic resin emulsion - urea resin - melamine resin (weight ratio 1:1:1) was impregnated using a horizontal impregnation dryer and dried. . The impregnation tank was coated with a resin content of 40% of the weight of the paper after impregnation treatment.After this, an aqueous clear top coat paint with the following composition was applied at a solid content of about 20g/1112, and immediately dried. did.

Modified melamine resin 30 parts Modified urea resin 30 parts Matting agent (Sin2) 5 parts Water + methanol 45 parts Hardness (IJII (p-toluenesulfonic acid) 7.5
It is true that the wood grain pattern decorative sheet obtained by
2. All of the conduit grooves were clearly concave, and the overall appearance was very similar to that of natural wood. Additionally, the thinner resistance of this sheet is 1. JAS-F
It passed the W standard thinner resistance test, and was able to withstand 200 times of rubbing with a cotton cloth impregnated with methyl ethyl ketone.

Claims (3)

[Claims] (1) Pattern printing, including printing to express recesses using water-based ink containing metallic soap, is applied to decorative sheet base paper using ink that does not prevent the penetration of water-based resin liquid for strengthening the base paper, as described below, and the resulting printed product is printed. A method for producing a decorative sheet with a three-dimensional pattern, which comprises impregnating a base paper with an aqueous resin liquid for strengthening the base paper and drying it, and then applying a transparent aqueous amino resin paint to the printing surface and drying it. (2) Claim 1 in which a cross-linked acrylic resin, urea resin, melamine resin, or one containing two or more of these resins is used as the aqueous resin liquid for strengthening the base paper.
Manufacturing method described in section. (3) The manufacturing method according to claim 1, in which the water-based amino resin paint contains a melamine resin, a urea resin, or a benzoguanamine resin as a film-forming component.