JPS6282019A - Decoration method for resin molded material - Google Patents

Abstract

PURPOSE:To perform patterning of unevenness and coloration on the top of a resin molded material, by a method wherein the resin molded material formed into a predetermined form by a mold or roll is cooled beforehand, the surface of the resin molded material is roughened, wood powder is exposed on the surface by removing surface resin to pattern unevenness. CONSTITUTION:Resin is melted within a heating cylinder, into which wood powder is loaded and kneaded so that a weight ratio becomes 10-50%. The molten resin is extruded through a heating cylinder with a screw and a predetermined form is given to the same by a die located at the tip. The surface of a molded resin molded material is roughened and a part of surface resin is eliminated. When a brush whose tip is irregular is used, uniformity is generated in roughing of the surface and woody feeling based on color shading can be improved in a coloring process. A decoration process based on embossing processing is performed after a pretreatment process. A woodgrain pattern is made clear by applying a coloring agent after the decoration process and the surface is wiped off by a roll round which unwoven fabric is wound.

Description

Detailed Description of the Invention (Technical Field) The present invention involves roughening the surface of the resin molded product after molding and removing part of the surface resin when producing a resin molded product by mixing resin and wood flour. The present invention relates to a method for decorating a resin molded article, which is characterized in that the resin molded article is pretreated to expose wood powder, and then an uneven pattern or a six-color pattern is applied to the L side of the resin molded article.

(Prior art) In a method for decorating resin molded products in which resin and wood flour are mixed and the surface is decorated, the mixed resin is extruded from a textured mold, etc., or during the rolling process using embossing rolls. Decorating.

(Problem) In the above method, since the decoration process is performed before the mixed resin has cooled down, the volume of the decorated part shrinks due to cooling after the decoration process, resulting in so-called "shrinkage" (thin marks). occurs. This "shrinkage" causes the uneven pattern to lose its clarity, so-called sharpness, and to cause distortion in the pattern shape.

Furthermore, on the surface of the resin molded product, a surface resin is formed on the mixed wood powder and wood powder, and the wood powder becomes 1? There were problems such as not being able to fully utilize the wood texture.

(Means for solving the problems) The present invention was invented to solve the above problems.
After the molding process, the surface of the cooled resin molded product is roughened, the surface resin is removed, and a pretreatment is performed to expose the wood powder, and then an uneven pattern such as a wood grain pattern is created. This eliminates the "shrinkage" that occurs during molding, further increases the wood texture of the wood L1 pattern formed on the surface of the resin molded product, and provides a clear pattern.

Hereinafter F: An uninvented method for decorating resin molded articles will be explained.

(Example) Resin and wood flour are used as the primary materials for forming the resin molded article.

The resin is phenyl chloride resin (PVC).

Phenol resin, polyethylene, polypropylene, etc. are used.

As the wood flour, sawdust or crushed chips are used.

The moisture content of this wood flour is preferably about 5%.

In the process of mixing bipod resin and wood flour, the resin is usually melted in a heated cylinder (barrel), and the wood is added into the melt at a weight ratio of 10 to 50% (preferably 25 to 30%). Add flour and mix.

Next, the molten resin is extruded from the heating cylinder using a screw, and a predetermined shape is formed using a die (mold) at the tip. To form a sheet-like resin molded product, it is continuously molded into an endless long material while being cooled and solidified with water or air.

In addition to the extrusion molding method using a die, for example, calender molding may be used, in which the molten resin from a heating cylinder is rolled with hot rolls to form a predetermined shape, and then cooled in a rolling manner.

Furthermore, it may be formed not in a sheet shape but in a plate shape or box shape having a predetermined wall thickness.

Next, the surface of the resin molded product molded by the above-mentioned appropriate method is roughened and a part of the surface resin is removed. The specific method is to rotate a brush or buff roll and bring it into contact with the surface of the resin molding to smooth out any unnecessary unevenness that may have occurred during formation, as well as to remove many small scratches and remove the surface resin of the resin molding. removed.

In this first step, the main purpose is to eliminate the surface gloss that occurs when rolled with ties or rolls. By removing the surface resin, the mixed wood powder is exposed on the sorting surface, which further enhances the wood texture and improves the penetration of the colorant. In particular, the wood powder with 'A I+' on the surface does not have a width that gives a visually appealing woody feel, but increases the woody feel when touching the resin molded product.

After the L foot pretreatment, add Enphos 1. Decoration 1-
do the process. The embossing is formed by inserting a resin molding between the bo/chi and the die, or by interposing the resin molding between embossing rolls to continuously form an uneven pattern.

After Decoration 1-1, apply 73 coloring agents and make wood 11.
The pattern is made clear and its surface is wiped off with a roll wrapped with non-woven material 11j or the like.

71 Pigments or dyes are usually used as coloring agents.

In addition, if you mix a blue agent in the heating cylinder and color the base material itself of the resin molding in 11 colors in advance in the same way as the surface coloring, the base material will not be damaged at the cut surface or the damaged part on the surface of the resin molding. Even if exposed, the wood texture will not deteriorate.

The surface of the resin molded product formed through the above steps is treated with a so-called top coat, and if necessary, cut into desired widths and lengths to complete the entire molding process. Note that cutting can also be performed after extrusion molding and before the decorating process.

Although the method for decorating the Kitaki resin molded article has been described with respect to the case where a wood grain pattern is attached, the gist of the present invention is not limited to this, and the same applies to the case where a resin surface that simply has a wood texture instead of a wood grain pattern is formed. It can be manufactured by the above process.

(Effects) - After molding and cooling, a pre-treatment process is performed to decorate, so there is no "shrinkage" and the pattern shape is always sharp, increasing the presence of the dimple pattern, making it suitable for use in building materials, etc. However, it is widely used as a building material that harmonizes with other wood-based materials and has great added value.

(It can be manufactured continuously without branching the process, and there is no need for amplifiers, etc., which reduces manufacturing costs.)

Claims (1)

[Claims] This is a method of decorating the surface of a resin molded product mixed with wood flour with a wood grain pattern, etc. The resin molded product is formed into a predetermined shape using a mold or roll, and after it is cooled in advance, the surface of the resin molded product is coated with a wire. A method for decorating a resin molded article, which comprises roughening the surface with a brush, puff roll, etc., removing surface resin to expose wood powder on the surface, and then adding an uneven pattern.