| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection molding device capable, by inhibiting flow fluctuations on an occasion where one molten resin merges with another within a nozzle unit, of stabilizing the shape of an intermediate layer within a preform.SOLUTION: The injection molding device of the present invention includes a nozzle unit 1 for injection-molding a preform for biaxial draw blow molding obtained by laminating at least one intermediate layer within a base layer in a state where an inner flow channel 15 and an outer flow channel 17 forming the base layer and a middle flow channel 16 positioned between the inner flow channel 15 and outer flow channel 17 for forming the intermediate layer are arranged coaxially, where the middle flow channel 16 is divided into a specified number of flow channels by shield longitudinal rib pieces 20 at the downstream-side terminal portion thereof, and where the shield longitudinal rib pieces 20 infiltrate at least either of the inner flow channel 15 and outer flow channel 17. |
