| 摘要 |
PURPOSE:To obtain a multi-layer oriented bottle efficiently, by a method wherein a temperature control of each resin layer of the inside of a preform is performed by making use of a temperature distribution of the preform to be generated during a cooling course after injection molding at the time of molding of a heat-resisting multi-layer oriented bottle by compounding resin composites whose heat-resisting temperature and molding temperature are different from each other. CONSTITUTION:A preform having a resin composite having the glass transition temperature on a high-temperature side selected out of the resin composites composed of 99-20wt% polyethylene terephthalate, 1-80wt% polycarbonate for its core layer and constituting the resin composite having the glass transition temperature of a low-temperature side into a skin layer is molded. Then a biaxially oriented blowing is performed by controlling a surface temperature of the preform so that the temperature falls within a temperature range satisfying an expression (1). Because a difference between the glass transition temperatures of the two kinds of the selected resin composites satisfies an expression (2) and melt viscosity of the core layer resin composite is lower than that of the skin layer resin composite, a multi-layer biaxially oriented heat-resisting bottle is manufactured. With this construction, the multi-layer biaxially oriented bottle which is superior in heat resistance, pressure resistance, gas barrier properties and transparency can be manufactured efficiently. |
