CH651226A5 - METHOD FOR TREATING THE SURFACE OF OBJECTS WITH A SMOOTH LIQUID-SUCTIONING SURFACE. - Google Patents

Description

The invention relates to a method for the surface treatment of objects with a smooth, liquid-absorbent surface, in particular wooden objects, such as e.g. Particle boards, fiberboard, building boards, boards and masonite, which are specially calculated for furniture and inventory.

Many processes of this type, especially for wood, are known. Most of these methods are based on applying lacquer (or paint) and then sanding it off, applying lacquer (or paint) again, then sanding it off, applying lacquer again, etc. This results in a very smooth and wear-resistant surface, which may be the base layer for a final layer of paint. However, if the latter is said to be a layer with a metal-like effect, the above process is too slow and too expensive.

The invention has for its object to provide a method of the above type which can quickly and cheaply provide the objects with a metal-like, very durable surface.

The method according to the invention is characterized in that a color layer, such as, for example, glaze color, stain or an opaque basic color, is applied to the smooth surface of the objects, and that this color layer, after it has dried, and without grinding being carried out a layer of clear lacquer with 0.1-10% by weight, preferably 0.2-8% by weight, in particular 0.4-6% by weight, of metal powder with a particle size of 5-5000 μm, preferably 50-350 μm, then applied, and that, if appropriate, at least one layer of gloss-regulating topcoat with a gloss between 10 and 100, preferably between 40 and 60, is then applied according to the Gardner 60 ° gloss scale. In this way, a quick and cheap production of the metallic surface is achieved, first because the sanding after the application of the paint layer is no longer necessary. The metal-like surface has good wear resistance, and if there are small cracks, these are hardly noticeable thanks to the paint layer underneath. The metal-like surface presents a rather strange look.

The clear coat is e.g. a nitro lacquer, acid-curing lacquer, polyurethane and polyethylene lacquer can be used. In practice, these types of lacquer proved to be the most advantageous.

Furthermore, the metal powder used can be aluminum, brass or copper, optionally a mixture of several of these metals. In this way, in conjunction with the underlying paint layer, the finished surface is given a very peculiar metal-like appearance.

In addition, according to the invention, a colored film made of e.g. Use plastic or paper, which can be glued to the smooth surface of the object. In this way, a particularly easy and quick application of the color layer on the object is achieved, and a uniform distribution of the color in the color layer is ensured.

Finally, according to the invention, the application of the paint layer, the clear lacquer layer with metal powder and the possible layers) top coat can be done automatically by guiding the objects forward on a conveyor belt, the "carpets" of paint layer material exposed by spray guns, clear lacquer with metal powder or possibly Top coat, passed by. This ensures that the surface treatment can be carried out particularly cheaply.

The invention is explained in more detail below using exemplary embodiments.

example 1

A chipboard with a smooth surface was primed with a covering layer of paint. Thereafter, after the paint layer had dried, and without any previous treatment, such as e.g. Grinding was carried out, a layer of clear lacquer with 0.5% by weight aluminum powder was applied, the grains of which were approximately 250 μm. The finished chipboard received a metal-like surface in a color that corresponded to the color layer. The surface mentioned was both hard-wearing and appealing.

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Example 2

A layer of stain was applied to the smooth surface of a fibreboard, i.e. a glaze (= transparent) color in the desired shade. After drying without having been sanded down, a layer of clear lacquer was then applied which contained brass powder in a weight amount of 6% by weight. The brass grains were about 200 / in size. Two additional layers of top coat with a gloss of 50 were then applied to the surface formed on the Gardner 60 ° gloss scale. The finished surface looked like a metal and was very wear-resistant.

Example 3

A colored plastic film was applied to a smooth wooden object, the film being glued to the object. A layer of clear lacquer with 4% by weight copper powder was then applied to the film.

The powder grains were approximately 340 | xm. The finished article had a nice metallic look and the surface was very wear resistant. It was also very quick and cheap to manufacture.

With regard to the application of paint layers and lacquers, this can be done automatically by guiding the objects forward on a conveyor belt that runs through "carpets" made of the paint layer material, clear lacquer (with metal powder) and, if necessary, top coat. There must be such a large gap between the "carpet" made of paint layer material and the "carpet" made of clear lacquer that the paint layer material can dry somewhat.

Masonit® is a fiberboard made of wood, which is divided into fibers and then pressed together in sheet form under high pressure and high temperature. The addition of glue is often not used because the cellulose in the wood binds the fibers together. Resin glue can be added.

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Claims (10)

651226 1. A method for the surface treatment of objects with a smooth, liquid-absorbent surface, characterized in that a color layer or a colored film is applied to the smooth surface of the objects, and that this color layer after it has dried and without grinding , or a layer of clear lacquer with 0.1 to 10 percent by weight of metal powder with a particle size of 5 to 500 μm is then applied to this colored film. 2. The method according to claim 1, characterized in that at least one layer of gloss-regulating topcoat with a gloss between 10 and 100, preferably between 40 and 60, is applied according to the gloss scale Gardner 60 °. 2nd PATENT CLAIMS 3. The method according to claim 1 or 2, characterized in that a nitro lacquer, acid-curing lacquer, polyurethane or polyethylene lacquer is used as the clear lacquer. 4. The method according to any one of claims 1 to 3, characterized in that the metal powder used is aluminum, brass or copper, optionally a mixture of several of these metals. 5. The method according to any one of claims 1 to 4, characterized in that a colored film made of plastic or paper is used, which is optionally combined by gluing with the smooth surface of the object. 6. The method according to any one of claims 1 to 4, characterized in that the color layer consists of glaze paint, stain or an opaque base color. 7. The method according to any one of claims 1 to 6, characterized in that the clear lacquer contains 0.2 to 8 percent by weight, in particular 0.4 to 6 percent by weight of metal powder. 8. The method according to any one of claims 1 to 7, characterized in that the metal powder has a particle size of 50 to 350 microns. 9. The method according to any one of claims 1 to 4.6 to 8, characterized in that the application of the color layer, the clear coat layer with metal powder and the possible layers) topcoat is done automatically by guiding the objects forward on a conveyor belt, the spray guns sprayed out “carpets” made of colored layer material, clear lacquer with metal powder or top coat, if necessary, passed by. 10. The method according to any one of claims 1 to 9 for the surface treatment of wooden objects, such as chipboard, fiberboard, building boards and boards, in particular those used for the production of furniture.