FORMING MOLD FOR CAP, INJECTION MOLDING METHOD FOR CAP, AND CAP

摘要

PROBLEM TO BE SOLVED: To obtain a forming mold which can be easily fabricated.

SOLUTION: In the forming mold 1 of the cap, the forming mold 1 of the cap contains a core 7 for an outer wall of an outer cylinder forming the outer wall 37c of the outer cylinder 37 in an inner lid 31, the core 7 for the outer wall of the outer cylinder has circular protrusion 7b in the tip 7a, and the circular protrusion 7b of the core 7 for the outer wall of the outer cylinder has a circumferential flange weakening portion 37g which is formed in the inner circumference of a hinge portion 33 and weakens an outer cylinder flange portion 37a of the outer cylinder 37.

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