| 摘要 |
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. |
