JPH0476592B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a method of manufacturing a plastic-plated portable watch case. For more information,
The present invention relates to an improvement in fixing a body made of a thermoplastic synthetic resin to a glass made of a translucent thermoplastic synthetic resin. [Summary of the Invention] The present invention involves pre-treating a thermoplastic synthetic resin body for plastic plating, electroless nickel plating and/or electroless copper plating, and translucent coating on the glass insertion part of the body. Mounted with thermoplastic synthetic resin glass,
By fixing the body and glass by ultrasonic welding and then electroplating, a portable watch case with plastic plating can be obtained at low cost. [Prior Art and Problems] Conventional portable watch cases in which metal is plated on plastic (hereinafter referred to as plastic plating) are made by plating a plastic body with plastic and then attaching glass to the body. It is fixed by adhesion with adhesive or press-fitting. However, in the case of adhesion, a process of applying adhesive is required, and this process is expensive, the amount of adhesive applied must be precisely specified, and waterproofness cannot be guaranteed due to deterioration of the adhesive. . Furthermore, with the press-fitting method, large distortions occur in the body, especially in the part where the glass is fixed, so that part must be made strong and gasket parts are also required. [Means for solving the problem] The thermoplastic synthetic resin body is pretreated for plastic plating, electroless plating is applied, and then transparent thermoplastic synthetic resin glass is ultrasonic welded to the body. After that, base plating consisting of copper plating or nickel plating and finish plating consisting of precious metal plating containing gold or gold alloy are applied. In this case, the nickel and/or copper electroless plating that is applied only to the shell is usually as thin as about 0.1 to 1.0μ, and in the subsequent process of fixing the glass to the shell by ultrasonic welding, The electroless plating layer applied to the body at the contact surface is destroyed, and the thermoplastic synthetic resin of the body and glass fuse and weld together. This is because the ultrasonic energy is concentrated on this contact surface. Furthermore, in the electrolytic plating process, metal does not precipitate because the transparent thermoplastic synthetic resin glass is not subjected to electroless plating treatment. The purpose of this invention is to stabilize the process of fixing translucent thermoplastic synthetic resin glass to a thermoplastic synthetic resin body, reduce manufacturing costs, reduce shape constraints, and create waterproof plastics. The goal is to get a beautiful mobile watch. [Example] Examples of the present invention will be described below. As a first example, a polycarbonate resin was molded into a predetermined body shape by injection molding, and the treatment shown in Table 1 below was performed as a pretreatment for plastic plating.

[Table] Next, electroless plating was performed as shown in Table 2.

[Table] Furthermore, acrylic glass was set on the electroless plated body and fixed by ultrasonic welding. The body with this glass attached was electrolytically plated as shown in Table 3.

〔Effect of the invention〕

In this invention, an ultrasonic welding process is provided between the electroless plating process and the base plating process, so metal is not deposited on the transparent thermoplastic synthetic resin glass and the body and glass are stably fixed. A portable watch case that is made of aluminum, has good waterproofness, corrosion resistance, adhesion, and has an excellent appearance can be obtained at a low cost.

Claims (1)

[Claims] 1. In the case of fixing a thermoplastic synthetic resin body and a translucent thermoplastic synthetic resin glass, the thermoplastic synthetic resin body is pretreated with plastic plating, and the body is coated with electroless nickel plating or non-electrolytic nickel plating. Electrolytic copper plating is applied, and a translucent thermoplastic synthetic resin glass is placed on the glass insertion part provided in the body,
The body and the glass are fixed by ultrasonic welding, and then base plating consisting of copper plating or nickel plating and finishing plating consisting of precious metal plating containing gold or gold alloy are applied. A method of manufacturing a portable watch case characterized by: