MANUFACTURE OF OPTICAL PLASTIC ARTICLE

摘要

PROBLEM TO BE SOLVED: To provide a method of manufacturing an optical plastic molded article with thickness and dimensional precision by shortening the molding period of time with a conventional injection molding method. SOLUTION: The manufacture of an optical plastic article comprises the steps of a process (A) for molding a primary molded article 1 by injecting molten resin in the cavity of a mold, and a process (B) for injecting the same resin as in the process (A) in a part or entire part of the primary molded article 1 and molding a secondary molded article 2 molded by melt-integrating the primary molded article 1 and injected resin. Herein, the primary molded article 1 is cleaned prior to coating resin over the primary molded article 1 in the process (B).