JPS59184228A - Production of plastic molding - Google Patents

Abstract

PURPOSE:To obtain a partially plated resin molding of a beautiful appearance by a simple process, by plating a resin molding obtained by two-color molding of a platable resin and a nonplatable resin. CONSTITUTION:A non-character area 2 is injection-molded from a platable resin (e.g., platable polypropylene). A character area 3 is injection-molded from a colored nonplatable resin (e.g., AS resin). Both parts are united to form a name plate (two-colored molding) 1. The entire surface of the name plate 1 is plated with a metal by a usual method to produce a metallic name plate having a plating on only the surface 2a of the non-character area 2. Examples of the platable resins other than the above include ABS resin and polycarbonate resin. Examples of the nonplatable resins include polyamide, polyethylene and polyvinyl chloride.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a two-color molded article made of plastic material.

Multi-color molding methods using two or more types of plastic materials have been widely used in the past, and with this method,
Daily necessities, equipment parts, etc. are obtained.

On the other hand, plating plastic molded products has been practiced for a long time. It has also been conventionally practiced to plate a part of a plastic molded product. A common method for this is to temporarily cover (mask) the parts that do not want to be plated and then plate them. (The present invention does not have the drawbacks of conventional methods, is 1iii, and the outside of the obtained molded product (r:
Thirdly, the present invention provides a method for manufacturing a beautiful partially plated plastic molded product. That is, ABS,
A molded product is molded in two colors using a plating plastic such as polypropylene for plating and a non-plated plastic such as polyoxymethylene or AS, and then the portion of the molded product molded with the plating plastic is plated with a metal such as Ni1Cr. In addition to ropyrene, it is characterized by applying
There are polycarbonate tree layers, methacrylic resins, etc. In addition to the above, non-plated plastics include polyamide, polypropylene, polyethylene, polyvinyl chloride, and polyamide.

In the present invention, the combination of the plastic for plating and the plastic not to be plated is preferably ABS and AS, polypropylene for plating and AS, or the like. This is because a combination of these plastic materials has excellent moldability due to the relative magnitudes of the melting point, molding shrinkage, etc. of the plastics.

Two-color molding involves first molding a portion of the part with plated plastic and then molding the remaining portion with unplated plastic, or the reverse order. This order is determined by the characteristics of the plastic, the shape of the molded product, etc.

The plastic part of the molded product thus obtained is plated with gold using a conventional method.

Next, examples will be shown.

As the plastic for plating, a nameplate (1) having the shape shown in FIG. 1 was injection molded using polypropylene for plating and AS, Kazutsuji (black), assuming that it was not plated.

In the figure, a=50rrm, b=12 threshold, c=2
It is tran. The non-character portion (2) is made of the above-mentioned polypropylene, which is a plating plastic. Mark J on the surface (2a) of the non-letter part (2) of the nameplate obtained by the usual method.
Added N+ plating to create a metal nameplate. The text part (3) of this nameplate was completely plated, no abnormalities such as spider lines between the front faces were observed, and the boundary between the non-text part and the text part was clear.

The present invention has the following features.

(1) Since a material that is not plated is used for the non-plated parts of the molded product, there is a wide range of material selection, and materials that meet the required characteristics can be used.

(11) Unlike the conventional method, there is no need for masking 7, so the process is simplified.

qll) The boundary between the plated part and the non-plated part is made clear, and the appearance of the non-plated part is also good.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a nameplate formed by the method of the present invention. FIG. 2 is an x-xi analysis plane of FIG.

Claims (1)

[Claims] A method for manufacturing a plastic molded product, which comprises molding a molded product in two colors using plastic for plating and plastic not to be plated, and then applying metal plating only to the part of the molded product that has been molded with the plastic for plating.