Gasket, method of molding same, and cylindrical alkaline manganese dioxide cell using same

摘要

A gasket for use in a cylindrical alkaline-manganese dioxide cell is molded by injecting a molten resin into a mold assembly having a male mold having an injection gate formed in a cylindrical space and a projection formed in a narrow space and of which a side facing the cylindrical space is chamfered or curved, and a female mold having at least any one of an eject sleeve or ejection pin. The gasket is used to seal an opening of a can of the cylindrical alkaline-manganese dioxide cell. In the gasket, the boundary between a thin portion and hob portion thereof is chamfered or curved and the boundary between the thin and diaphragm portions is formed like a generally vertical edge.