HEAD RESIN REPLACING METHOD OF BLOW MOLDING MACHINE AND ACCUMULATOR HEAD THEREOF

摘要

PURPOSE: To replace a resin within a short time by a small amt. of a resin in the accumulator head of a blow molding machine. CONSTITUTION: A new replacing resin is injected into an accumulator 209 by a screw 21 and pressurized by a ring piston 204 to extrude the old resin to be replaced in a housing 200 as a parison and the new resin is injected from an injection port 207 at the end of the pressurization by the ring piston 204 to be supplied to the region opposite to the resin injection side of the accumulator 209 through the communication passage 208 formed on the ring piston 204.