The die device and injection molding manner null for injection molding

摘要

PROBLEM TO BE SOLVED: To provide an injection molding mold device which can injection-mold many moldings such as plastic optical elements at once while securing expected performance by reducing influence during molding shrinkage and facilitate the demolding of the moldings and an injection molding method.;SOLUTION: After a molten resin is packed in each cavity 6, the tip part 34a of a constriction rod 34 is projected into a resin separation starting end part 3 by a passage constriction means 30. By constricting the resin passage of the entrance part 4a of each runner 4 in the resin separation starting end part 3, the deformation of the resin in each cavity 6 after mold opening is prevented. After mold opening, the resin cured in sprues 2, the runners 4, and the cavities 6 while being connected mutually is ejected from a second mold part 20 by the first and second ejector pins 43 and 44 of an ejection means 40.;COPYRIGHT: (C)2007,JPO&INPIT