Patent ID: 6607685
Filing Date: 2003-08-19
Classification: B29C,B29L,B65D

Abstract:
A method of producing a pierceable stopper, said pierceable stopper having:a pierceable part pierceable with a hollow needle, said pierceable part being made of a thermoplastic synthetic resin elastic material; and a stopper body made of a thermoplastic synthetic resin material having a higher rigidity than that of the material of said pierceable part, said stopper body having an outer peripheral portion for preventing a stress from propagating to an outside when said pierceable part is pierced with the hollow needle and for defining said pierceable part; â€ƒsaid method comprising the steps of: injection-molding said pierceable part in an injection mold; injecting a melt of a thermoplastic synthetic resin material into a cavity defined by said injection mold and said pierceable part to mold said stopper body at a melt injection pressure not lower than 500 kgf/cm2; and thermowelding said stopper body to said pierceable part in said injection mold by the melt heat of either said thermoplastic synthetic resin material or said thermoplastic synthetic resin elastic material.