| 摘要 |
<p>PURPOSE:To perform rapid molding processing by enhancing heating and cooling efficiency at the time of molding to a large extent, by interposing an intermediate layer having a heat insulating property and a gas barrier property between inner and outer layers comprising a polyester resin. CONSTITUTION:An intermediate layer 4 (e.g., a nylon 6/nylon 66 copolymer layer) having a heat insulating property and a gas barrier property is interposed between inner and outer layer 2, 3 comprising a polyester resin and bottom neck parts 12, 13, 14 are further formed to obtain a multilayered preform 11. After this preform 11 was preheated, the heated preform 11 is stretched by a stretching rod 25 in a blow mold of which the cavity surface is heated to 145 deg.C and, at the same time, compressed gas is blown in the preform from a fluid passage 27 to perform blow molding. After molding, a cooling fluid (e.g., cooling nitrogen gas) is made to flow into a molded body 29 from the fluid passage 27. The inner layer 2 is rapidly cooled because of the presence of the intermediate layer 4 and shape holdability necessary for taking-out is immediately obtained.</p> |
