JPH0322228B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a multicolored plastic decorative surface for use in decorating lighters, eyeglass frames, fountain pens, etc.

Various types of decorative surfaces using plastic have been known, but most are single-colored, and those that use multiple colors are limited to patterns with unclear boundaries such as marble patterns, and those that use multiple colors are limited to patterns with unclear boundaries such as marble patterns. Shapes and patterns with clear boundaries using color have not yet been realized.

The present invention uses a plurality of colors to obtain shapes and patterns with clear boundaries on plastic decorative surfaces.

In the present invention, a plurality of colors of paint are prepared by mixing a curing agent and a coloring material into a liquid epoxy resin, one paint is applied on the processed surface, defoamed in a vacuum, and heated and cured. A multicolored plastic decorative surface in which a recess is formed on the surface of the cured paint, the recess is filled with paint of another color, defoamed in a vacuum, heated and cured, and then the entire surface of the paint is polished. This is the manufacturing method.

The present invention will be described in detail below with reference to the drawings.

First, prepare multiple colors of paint. This paint uses a liquid epoxy resin mixed with a curing agent and a coloring agent. Pigments are usually used as the coloring material, but pearls, metal powders, plastic powders, etc. can also be used in place of or in addition to pigments.

Furthermore, a processed surface 10 as shown in FIG. 1 is prepared. This processed surface 10 is made of metal, plastic, or the like. If metal is used, the surface should be roughened by spraying with sand, emery steel, etc. so that the decorative surface will adhere well. In addition, in order to improve the aesthetic appearance of the edges of the decorative surface, the processed surface 10 is 0.3 to 0.7
It is best to make a recess of about mm. Note that this processed surface is not limited to a flat surface as shown in the drawings, but may be a curved surface, which is often found in eyeglass frames, or a cylindrical surface, such as the shaft of a fountain pen.

A paint 14 is applied onto this processed surface 10.
This application is performed by placing the paint on the processed surface 10 using a syringe or the like, and the paint is slightly (approximately 0.3 to 08 mm) bulged from the end 12 in preparation for shrinkage later (see Figure 2). . If the machined surface is cylindrical, like the shaft of a fountain pen, hold it horizontally.
If you perform coating and the work described below while rotating the paint around its axis, you can proceed without the paint dripping.

Next, it is placed in a vacuum container and degassed. Since air is mixed into the paint when the curing agent and colorant are mixed and applied, it is removed in a vacuum. Therefore, during later cutting, polishing, etc., when the surface is exposed, this air becomes bubbles and floats out, thereby preventing the bubbles from being exposed on the surface or causing cracks from the bubbles.

Next, the paint 14 and the surface are polished using sandpaper or the like (see FIG. 3). Since this polishing is to facilitate subsequent work, it may be omitted depending on the precision of the subsequent processing. Further, it is sufficient to use a polishing material lower in quality than that used for later finishing.

Next, a concave portion 16 is formed on the surface of this paint 14 (see FIG. 4). This work can be performed by cutting, embossing, die cutting, etc. using a carving machine or the like.

Next, the recessed portion 16 is filled with a paint 18 of another color in the same manner as described above, and the paint 18 is defoamed and cured (see FIG. 5). Note that if not only the paint 14 but also the surface of the machined surface 10 is removed during the cutting, sand or the like is again sprayed to roughen the surface of the machined surface 10 before filling the paint 18 so that the paint 18 adheres well. I'll leave it as that. If the surface of the processed surface 10 is not exposed, the paint 18 adheres well to the paint 14, so that this roughening work is not necessary.

Thereafter, the entire surface of the paints 14 and 18 is polished with sandpaper or the like, and further puffed to create a smooth surface (see FIG. 6). End portion 12 at this time
The surface is also polished at the same time to make it smooth.

In this way, the decorative surface is completed, and usually this rear end 1
2 is given a plating finish and made into a product.

The above manufacturing method performs the process of forming a recess and filling it with paint once to express two colors, but the process of forming a recess and filling it with paint is repeated two or more times to display three or more colors on the surface. It is also possible.

For example, after the paint 18 is filled and cured, that is, after the state shown in FIG.
0 (see Figure 7), defoaming, hardening, and further polishing to finish.

Furthermore, after forming the recesses, instead of filling all the recesses with the same paint, each recess is filled with paint of a different color, and the two or more colors of paint are defoamed and cured at the same time. It's not impossible either. However, in this method, there is a possibility that the paints may scatter and mix with each other during defoaming, so the condition is that there is sufficient distance between the different paints.

As is clear from the above, according to the present invention, a pattern of any shape with clear boundaries can be expressed using multiple colors. In addition, each paint adheres strongly,
There is no need to worry about it peeling off, and the surface is polished to a beautiful, smooth finish.

Therefore, the decorative surface of the present invention can be widely used in lighters, cigarette cases, pendants, eyeglass frames, watches, fountain pens, and the like.

EXAMPLES The present invention will be explained in more detail below with reference to Examples.

Example A liquid epoxy resin (91% by weight) and a pigment (9% by weight) are mixed at room temperature (approximately 25°C), and 30% by weight of a curing agent is further mixed at room temperature to form a paint. As the liquid epoxy resin, we used Clear manufactured by Tanabe Kagaku Co., Ltd. (115 Clear and 101 Clear mixed at a weight ratio of 34:15), and as the pigments, we used the same company's G20% 50 (brown) and 4GT20% 501 ( blue),
Either GRH20% 501 (yellow), 2303 (red), RN (violet), or GT (green) is used, and the company's CA80 is used as the curing agent.

Prepare a flat brass machined surface with edges raised by 0.5 mm, and spray emery steel onto this surface to make it rough.

Place the above paint 1 on the processed surface using a syringe,
After leaving this as it is at room temperature for 10 to 20 minutes to allow the paint to settle, it is placed in a vacuum container and defoamed for 10 to 15 minutes at a pressure of about 10 ^-3 Kg/cm ² . Then put it in the furnace, 60-135
Heat at ℃ for about 4 hours to harden.

Next, the surface is polished using sandpaper, and the paint is cut to a depth of about 0.4 mm using a carving machine to form a recessed part.

Fill this recess with another color of paint using a syringe,
Defoaming and curing are performed in the same manner as above.

After this, the entire surface and edges of the paint are polished with sandpaper to give a puff finish.

Furthermore, the end surface is plated to complete the process.

This will give you a decorative surface with a beautiful two-color pattern.

[Brief explanation of drawings]

The drawings are cross-sectional views showing the steps of the present invention.
The figure shows the processed surface, and the second figure shows the state with paint 1 applied.
Figure 3 shows the paint after it has been polished, Figure 4 shows it with the recesses formed, Figure 5 shows it filled with paint of another color, and Figure 6 shows the finished polished surface. Furthermore, FIG. 7 shows another manufacturing method, in which the steps of forming a convex portion and filling it with paint are performed twice. 10... Processed surface, 12... End, 14, 18,
20...Paint, 16...Concave portion.

Claims (1)

[Claims] 1. Prepare a plurality of colors of paint made by mixing a curing agent and a coloring material into a liquid epoxy resin, apply the paint 1 on the processed surface, degas it in a vacuum, and heat cure it. After that, a recess is formed on the surface of the cured paint, and this recess is filled with paint of another color, defoamed in a vacuum,
A method for producing multicolored plastic decorative surfaces that is heated and cured, and then the entire surface of the paint is polished. 2. The method for producing a multicolored plastic decorative surface according to claim 1, wherein the steps of forming recesses on the surface of the cured paint, filling the recesses with the paint, defoaming, and curing the recesses are repeated two or more times.