| 摘要 |
PURPOSE:To form a multilayer parison and to largely reduce gas permeability by extruding a laminated layerlike resin to a parison outlet via a ring plunger, alternately laminating a main material resin, an adhesive resin and a barrier resin in a thickness direction, and injecting the parison. CONSTITUTION:An extruder 30A for supplying a main material resin, an extruder 30C for supplying a barrier resin, and an extruder 30B for supplying an adhesive resin for adhering the main material resin to the barrier resin are connected to a rotary laminating ring 30 provided in a common accumulator 19. The ring 30 is rotated during metering thereby to laminate the main material resin, the adhesive resin and the barrier resin in a multilayer state. The obtained laminated layerlike resin is pressure extruded from a plunger 12 toward a parison outlet 15. Thus, the parison in which the main material resin, the adhesive resin and the barrier resin are alternately laminated in a thickness direction is extruded. |
