INJECTION BLOW MOLDING METHOD AND APPARATUS

摘要

PURPOSE: To dispense with a post-treatment process removing a gate mark or a parting line by arranging a core mold holding a parison and a neck mold in close vicinity to a blow mold in opposed relationship and injecting air into the parison to mold the same into a predetermined shape along the molding surface of the blow mold. CONSTITUTION: The principal part of a molding apparatus is constituted of the core mold 14 and neck mold 15 attached to a fixed mold attaching plate 12 through a fixed template 13 and the cavity mold 19 and blow mold 20 attached to the movable mold attaching plate 16 arranged in opposed relation to the fixed mold attaching plate 12 through a slide plate 17 in parallel to a spacer block 18. The injection port 23 of a valve gate 21 is opened to the leading end part of the core mold 14 and a lid-shaped cut-off mechanism is provided to the leading end part thereof. An air sending-in passage 24 reaching the outer periphery of the base part of the core mold 14 from the side surface of the fixed template 13 to send in blow molding air is provided to the fixed template 13. Since a raw material resin is injected from the core mold 14 to form a parison and the parison is subjected to blow molding by the integral type blow mold 19, a gate mark is not left on the surface of a molded object.