PREPARATION OF PLASTIC MOLDING

摘要

PURPOSE:To prepare a plastic molding having a projecting pattern of a uniform thickness, by molding a plastic by using a mold wherein a recessed pattern is only partly formed. CONSTITUTION:A fixed mold 3a wherein a circuit network 3a is engraved is tightly coated with a masking material 4 having a cutout part 4a. The surface of the masking material is then coated with a powder paint 2a by means of an electrostatic coating machine 5. Then, the masking material 4 is removed and the powder paint 2a is plasticized by heating. In a molding process, movable mold 3a is placed on the fixed mold 3a and the molds are closed. A molten plastic material is filled in the gap of the molds from a filling hole 3b' and is molded. By opening the molds, a plastic molding 1 wherein a circuit pattern 2 is tightly anchored can be obtained.