Patent ID: 6471902
Filing Date: 2002-10-29
Classification: B29C

Abstract:
A multi-point thin portion compression molding method comprising the steps of:disposing a pair of metal mold apparatuses opened/closed to each other to form a cavity having a molded material shape therebetween when a mold is closed; disposing at least one movable telescopic member on one opened/closed movable metal mold of the metal mold apparatuses for protruding toward the other fixed metal mold in said cavity by a metal mold mechanism or a separate mechanism; forming a recess portion for a rib on said movable metal mold for surrounding the periphery or a part of the movable telescopic member; closing said movable metal mold and the fixed metal mold to fill the cavity other than said recess portion with molten resin; subsequently allowing said movable telescopic member of said movable metal mold to protrude to compress the molten resin in the cavity; and allowing the molten resin to escape to said recess portion to adjust pressure applied to the inside of the metal mold so that at least one ultra thin portion is formed on a molded material by stable compression, wherein the thickness of the ultra thin portion of said molded material is formed to be a film of ultra thin thickness in a range of 0.1 to 0.25 mm by compression of said movable telescopic member.