Japan Crown Cork Co Ltd.

Hisashi Nakajima

Mitsuo Kumata

Yuji Kano

Shinya Matsumoto

Katsuhito Ichimura

Kouichi Tsuchiya

Kiyohisa Kaito

Koji c/o Otsuka Pharmaceutical Co Ltd Kitano

Hiroshi Sato

A metallic container closure including a shell of a thin metal sheet having a circular top panel wall () and a skirt wall (), and a synthetic resin liner arranged in the shell, the skirt wall () having a thread-forming region and an annular groove () positioned at an upper end portion of the thread-forming region, wherein an internal pressure release line A extending in the circumferential direction is arranged in the skirt wall () at a portion over the annular groove (), and annular bead () is arranged so as to pass through between the internal pressure release line A and the annular groove ().

Metallic container closure having internal pressure release function

A metallic container closure comprising a shell of a thin metal sheet having a circular top panel walland a skirt wall, and a synthetic resin liner arranged in the shell, the skirt wallhaving a thread-forming region and an annular groovepositioned at an upper end portion of the thread-forming region, wherein an internal pressure release line A extending in the circumferential direction is arranged in the skirt wallat a portion over the annular groove, and annular beadis arranged so as to pass through between the internal pressure release line A and the annular groove. The metallic container closure effectively releases the gas when the pressure in the container is elevated and effectively prevents the skirt wall from being deformed at a portion where the internal pressure release line A is formed when it is being wrap-seamed with the mouth-and-neck portion of the container.

A container closure formed from a synthetic resin as a single unit has a circular top panel wall and a cylindrical skirt wall extending downwardly from the peripheral edge of the top panel wall. An outer cylindrical sealing protrusion, an inner cylindrical sealing protrusion, and annular sealing ridge, all having a predetermined shape and a predetermined size, are formed on the inner surface of the top panel wall. In one embodiment, the thickness of the center portion of the top panel wall is reduced to a predetermined range and a plurality of ribs having a predetermined thickness are formed on the inner surface of the center portion of the top panel wall.

Synthetic resin container closure

Growing community of inventors

Hiratsuka, Japan

Hisashi Nakajima