JPS6120796A - Formation of uneven pattern - Google Patents

Abstract

PURPOSE:To easily form any uneven pattern without the use of expensive equipments by a method in which a desired projected pattern is printed by silk screen printing on the surface of an object to be processed, and a desired color printing is applied on the recessed portion or all surface of the object. CONSTITUTION:A desired spotted pattern is printed by silk-screen printing on the surface of an object 1, e.g., sheeted cloth, etc., to form projected portions 2 with ink, where the projected portions 2 may be formed by one-time or more printing using the same screen in such a way as to obtain a desired height, or the heights and colors of the projected portions may be different. A desired printing ink is printed by silk-screen printing 4 on the recessed portions 3 or all surface of the object 1 to form a desired uneven pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a three-dimensional uneven pattern on a plastic sheet or a plastic molded product.

In recent years, plastic sheets with a three-dimensional film pattern, wood grain pattern, etc. have been frequently used for interior materials such as automobile door trims, or for the surfaces of furniture, etc., respectively.

By the way, conventional methods for attaching this type of three-dimensional pattern include: 41 A method of attaching an uneven pattern to a workpiece by press working using a mold with a desired uneven pattern engraved on the surface; A method of continuously applying an uneven pattern during extrusion molding or calendar molding of a workpiece by using an embossing roll with a desired uneven pattern on the surface; using
A common method is to press-fit molten plastic into the split mold by injection molding or the like, and simultaneously form a concavo-convex pattern on the surface of the product.

However, all of these methods have the disadvantage of high mold costs because the pattern must be created in the original mold, and although they are suitable for mass production, they are not suitable for high-mix, low-volume production. .

Furthermore, it is difficult to create complex color changes in these materials when applying the pattern, and for this purpose, it is necessary to color the desired color pattern in advance by stopping printing before applying the pattern.

Therefore, in view of these drawbacks, the present invention aims to provide a novel method for forming a concavo-convex pattern suitable for high-mix, low-volume production.

The gist of the present invention is to first form convex portions in a desired spotted pattern on the surface of the fabric of the workpiece by screen printing, and if necessary, form the convex portions in a similar manner to the desired height, and then The method involves printing in a desired color on the entire printing surface including the concave portions or the convex portions of the non-printing surface to form a desired uneven pattern.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial plan view of a workpiece (sheet-like fabric) on which convex portions are printed in spots according to the present invention, FIG. 2 is an enlarged vertical cross-sectional view thereof, and FIG. It is an enlarged vertical cross-sectional view of a fabric that is further printed on the entire surface.

First, as shown in Fig. 1, a sheet-like workpiece 1 is prepared.
A desired spot pattern is printed on the surface by silk screen printing, and desired convex portions 2f are formed on the fabric using ink. The height of the convex portion 2 is determined by the amount of printing ink applied, and is arbitrarily adjusted depending on the viscosity of the ink and the roughness of the screen. If the desired height cannot be obtained for the spotted convex portions 2, the convex portions 2 having the desired height may be formed by printing one or more times with the same screen (plate). , t, it is also possible to change the plate and form the convex portions 2 having heights.

Note that at this time, a convex pattern having an arbitrary tone can also be formed by changing the color of the printing ink.

Next, silk screen printing 4 is performed using a desired printing ink on the four parts 6 of the surface of the workpiece on which the convex portions 2 have been printed, that is, on the non-printing surface, or on the entire printed surface of the workpiece including the convex portions, using a desired printing ink. It forms an uneven pattern.

At this time, by changing the printing ink for the convex portions 2 and the concave portions 6, it is possible to obtain a workpiece 1 having a marble-like concavo-convex pattern having convex portions 2 of different tones among the four portions 6,
If they are of the same color, the workpiece 1 can have the appearance of a shibori pattern.

The above description has been made using a sheet-like workpiece as an example, but even if the workpiece is a three-dimensional object, such as a cylindrical container or other molded product, the uneven pattern can be formed in the same way. Needless to say, curved screen printing may be used for the above-mentioned containers, for example.

As described above, the present invention forms convex portions of a desired height on a workpiece by silk screen printing, and then prints ink of a desired color on the surface of the workpiece including the concave portions or convex portions between the convex portions. Since it is silk screen printed, it has the advantage that any uneven pattern can be easily formed by changing the silk screen plate, and does not require expensive molds or equipment such as conventional molds. It has the feature that it does not.

In addition, the fact that this plate can be easily changed makes it suitable for high-mix, low-volume production.Furthermore, by changing the color of printing ink, complex uneven patterns with arbitrary color tones can be created.
It has the advantage of being able to obtain the following characteristics, and has the advantage of providing a large degree of freedom in designing the surface of the workpiece.

[Brief explanation of drawings]

Fig. 1 is a plan view of a round plate processed by printing a convex pattern according to the present invention, Fig. 2 is an enlarged vertical cross-sectional view of Fig. 1, and Fig. 6 is an additional print on the surface of the workpiece shown in Fig. 1. FIG. 2 is an enlarged longitudinal cross-sectional view similar to FIG.

Claims (1)

[Claims] A method for forming an uneven pattern, which comprises printing convex portions having a desired speckled pattern on a workpiece by screen printing one or more times, and then applying screen printing to the concave portions or the entire surface of the printed surface.