Jig for orientation-blow molding piece
AssigneeYoshino Kogyosho Co., Ltd.
InventorYataro Yoshino
Life of this patent
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Abstract
A jig used for a blow-molding machine for fabricating a bottle-shaped container of biaxially oriented plastic, which comprises advantageously a core shaft elevationally movably inserted in a mandrel and having a blow-molding air passage for longitudinally orienting the piece, and a heat insulating layer provided on the outer periphery of the core shaft for heating the piece upon irradiation of heat rays such as far infrared rays to thereby externally heat the piece and also internally heat the piece. Thus, the piece is uniformly heated in or immediately before the blow-molding of the piece so as to improve the molding accuracy of the piece into a bottle-shaped container in the blow molding mold.
Claims5
A device for heating an injection molded resin piece having a neck, prior to biaxial orientation blow molding, comprising:
- a rotary turntable;
- a cover disposed above and spaced from said turntable;
- a jig disposed at the periphery of said turntable, comprising:
- a neck support for holding the piece in neck portion downward position;
- a mandrel disposed beneath said neck support;
- an elevationally reciprocally movable core shaft inserted in said mandrel and extending through said neck support for longitudinally orienting the piece, having a blow-molding air-passage;
- a heat-insulating layer coated on the outer periphery of said core shaft;
- a plurality of infrared or far infrared ray heating elements disposed inside said cover in the vicinity of the periphery of the turntable, said insulating layer comprising material which will cause heating of the interior of the piece held by said jig due to heating of said insulating layer by special wavelength rays of said heating elements upon irradiation of said heating elements.
Dependencies are inferred from the claim text.