MANUFACTURE OF OPTICAL MOLDED ARTICLE

摘要

PROBLEM TO BE SOLVED: To provide a manufacture of an optical plastic article with superior dimensional accuracy even in a molded article with thickness by saving the molding period of time in a conventional injection molding method. SOLUTION: The method of manufacturing an optical plastic article comprises the steps of a process A for molding a primary molded article 1 by injection 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 melt-integrating the primary article 1 and injected resin. As such, the primary molded article 1 is preheated in its surface at a softening temperature or lower of the resin before the primary molded article 1 is covered with resin in the process B.