| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection molding device capable of abating the stagnation, within a nozzle unit, of an intermediate layer resin forming the intermediate layer of 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, and where paired side walls 20a positioned respectively on both sides of peripheral directions of the shield longitudinal rib pieces 20 constitute slanted planes each having upstream-side wall portions 20b separated via progressively narrower gaps from downstream to upstream sides thereof. |
