JPS6155458B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a three-dimensional pattern on various parts of automobiles, such as ornaments molded with various resins, by invading the pattern in a three-dimensional manner.

Generally, the surface of resin molded products such as bumpers and moldings is engraved with vehicle model names, decorative characters, figures, symbols, and other appropriate patterns.

Conventionally, this type of construction involves creating recesses in the desired pattern on the surface of a resin molded product, and then coloring the recessed surface with paint, masking, hot stamping, etc. There is. However, with this construction method, the protrusion needed to shape the recess must be folded into the mold, so it is necessary to manufacture several molds due to different specifications.
Increasing the number of types increases the number of molds, which not only increases manufacturing costs but also requires time and effort to maintain and manage the molds. In addition, since the pre-formed invaginated surface is colored, it is difficult to apply paint, ink, etc. beautifully along the contour line of the shaped part, and a skilled technique is required. ing.

The present invention provides three-dimensional pattern formation on a resin molding surface that is extremely easy to use, can be beautifully colored along the outline of a desired pattern, and can be beautifully finished even when forming relatively deep shaped recesses. The purpose is to provide a method.

That is, in the method for forming a three-dimensional pattern according to the present invention, for a resin molded product formed in a shell shape,
A pressure invagination process is applied together with materials that form desired characters, figures, symbols, and other appropriate patterns, so that the thick part of the main body that invades as the pattern material adheres is absorbed inside the shell. .

This will be explained below based on the illustrated embodiments.

The resin molded products 1 and 2 are made of a suitable resin such as non-foamable polyvinyl chloride and are formed into a shell shape with outer shell portions 1a and 2a. It is desirable that the wall thickness of these outer shell parts be made thin enough not to impair the strength resistance of the product. In the first embodiment, the inside of these is made solid with a foamed resin layer 1b made of foamed polyvinyl chloride or the like. Further, in the second illustrated embodiment, it is hollow, and in order to reinforce the hollow space, vertical ribs 2b, 2b are formed integrally with the main body 2a, separating the pattern forming width, which will be described later.

These resin molded products 1 and 2 are heat-treated at least in the construction areas where letters, figures, symbols, and other appropriate patterns are to be formed, and at the same time, a pressure press is applied using a rod-shaped body (not shown). Processing is performed. In this construction, a material forming an appropriate pattern such as desired characters, figures, symbols, etc. may be applied in advance on a flat surface. Examples of the material include paints, inks, resin sheets, etc., and methods of adhering include masking painting, printing, and adhering to punched sheets. Also,
The invagination pressing of the attached pattern can be performed by applying pressure under heat with a pressing mold having convex portions corresponding to the pattern.

In the third and fourth illustrated embodiments, the process of pressing and invaginating the resin molded product 1 with a hot stamp H using a transfer film F is shown. Transfer film F
is continuously pulled out from the roll R, and the used portion after being cut out with the hot stamp H is wound onto the roll R'. On the way, the heads of hot stamps H are arranged in parallel above.
These heads, which move up and down at the same time, cut out a desired pattern from the transfer film F, and then form a resin molded product 1.
It is designed so that it can be invaginated into a predetermined surface. The head of the hot stamp H descends from the left in the third figure and presses the transfer film F against the flat surface of the resin molded product 1. Then, the resin molded product 1 is heated and softened to invaginate as shown in the lower left of the drawing. At this time, the material adhered to the lower surface of the transfer film F is transferred into the recessed part of the resin molded product 1 according to the shape of the head.
In addition, due to this intrusion pressure, the thick part 1 of the relevant part
c compresses the bubbles in the foamed resin layer 1b and protrudes into the shell. Therefore, the thick portion does not appear as a protrusion on the edge of the recess, which tends to occur especially when the wall is thick, and the edge can be beautifully finished. After completing the transfer work of pattern forming material, hot stamp H
All the heads of the transfer film are raised to feed out a transfer film of a certain size and wait until the next pressing operation.

As described above, according to the method for forming a three-dimensional pattern according to the present invention, since the attached pattern is press-formed with a rod-shaped body having a corresponding shape, the outline can be beautifully bordered.
Furthermore, since the invaginated thick portion is made to protrude into the shell-like interior, a burr-like protuberance does not occur and a beautiful invaginated edge can be formed.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views of the resin molded product before three-dimensional patterns are formed, and FIGS. 3 and 4 are explanatory diagrams showing the three-dimensional pattern forming process according to the present invention. 1, 2: Resin molded product, 1a, 2a: Shell-shaped outer part, 1b: Foamed resin layer, 2b, 2b: Rib,
1c: invaginated thick part, H: rod-shaped body, P: pattern forming material.

Claims (1)

[Claims] 1. A resin molded product is formed into a shell shape from a non-foaming thermoplastic synthetic resin, and at least characters, figures,
A desired area, including the outer surface portion on which a symbol or other appropriate pattern is to be formed, is heated and softened, and the softened portion is pressed and invaginated with a pattern-forming material using a rod-shaped body whose tip corresponds to the formed pattern. A method for forming a three-dimensional pattern on a resin molded product, characterized by: 2. The method for forming a three-dimensional pattern according to claim 1, wherein the press invagination of the pattern forming material is performed by hot stamping via a transfer film. 3. The three-dimensional pattern forming method according to claim 1, wherein the resin molded product is formed into a solid shell shape by a foamed resin layer. 4. The three-dimensional pattern forming method according to claim 1, wherein the resin molded product is formed in the shape of a hollow shell reinforced with vertical ribs integrally molded with the main body.