OUTER CYLINDER FOR SYRINGE, SYRINGE, INJECTION MOLDING MOLD FOR OUTER CYLINDER FOR SYRINGE, AND MANUFACTURING METHOD OF OUTER CYLINDER FOR SYRINGE

摘要

PROBLEM TO BE SOLVED: To provide an injection molding mold for an outer cylinder for a syringe, and a manufacturing method of the outer cylinder for the syringe which are capable of providing a uniform resin mold by controlling the flow of melt resin between a cavity and a core and to provide the outer cylinder for the syringe having a sufficient strength.

SOLUTION: This outer cylinder 31 for the syringe is provided with an annular groove part 42c provided in the inner face in the base end part and is formed of a low-fluidity resin with a melt index of 20 or less. The outer cylinder 31 for the syringe is provided with a melt resin injection gate position 44 for molding in the side face of the outer cylinder at a prescribed length in the tip side from a flange part 39. The inner face of the cylinder 31 is formed with a base-end-side tapered part 42b extending from the inner face position of the outer cylinder 31 corresponding to the melt resin injection gate position 44 to groove parts 42c and 59 or ribs 61 and 63.

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