PREHEATING METHOD OF MOLDING DIE

摘要

PURPOSE:To perform the short term and energy saving preheating by a method wherein temperature controlled heating air is blown into a molding cavity formed by the engagement of the force side part and cavity side part of a molding die from a molding material pour-spout provided on the molding die. CONSTITUTION:A certain gap delta is provided at a mold parting line, which is the joint surface of a force side part 1 and a cavity side part 2. Heating air is poured from the end part 8 of a nozzle 6 through a pour-spout into a molding cavity 4 so as to directly heat the cavity 4 and raise its surface temperature and finally discharged outside through the gap delta. The temperature of said heating air supplied is controlled and set at the proper value by a temperature detection sensor connected to the supplying source of the air. Because the molding cavity part is directly heated by the above-mentioned molding preheating and no complicated device is necessary to employ, the preheating time can be sharply reduced.