Nippon Closures Co., Ltd.

Suntory Holdings Limited

Masataka Iyadomi

Hideyuki Suzuki

Takashi Sugiyama

Osamu Ishii

Satoru Shimada

Daisuke Tsuchimoto

Shin Nakamura

An oxygen-shielding container lid according to the present invention comprises a high density polyethylene cap shellhaving a skirt sectionand a top plate sectionprovided with an inner ringfor intimate contact with an inner surface of a container mouth; and an in-shell molded bodyprovided in a portion of an inner surface of the top plate section which is surrounded with the inner ring. The in-shell molded bodyis composed of a primary molded bodywhich has been formed by in-shell molding on the inner surface of the top plate section and which has an oxygen shielding function; and a secondary molded bodywhich has been formed on the primary molded bodyby in-shell molding so as to cover the primary molded bodyand to be fused and fixed to the inner surface of the top plate section at the peripheral edge of the primary molded body. A resin composition used for formation of the secondary molded bodycontains linear low density polyethylene, and has a melt flow rate at 190° C. of 1 to 10 g/10 minutes, a density of 0.900 to 0.920 g/cm, and a nominal tensile strain at break, as defined by JIS K-6922-2, of 400% or more.

Container lid having oxygen shielding properties

A container lid is composed of a synthetic resin inside plug to be mounted on the mouth of a container, and a synthetic resin lid to be mounted on the inside plug. A breakable thin-walled line formed in a closing wall has an outer arcuate portion extending from a breakage start end portion, and an inner arcuate portion extending from the breakage start end portion, and defines an arcuate deformation region. A locked element is annexed to the deformation region, and a locking element is in the lid. When the lid is rotated in a predetermined direction, the locking element is locked to the locked element. When the lid is rotated further in the predetermined direction, a force is exerted on the deformation region via the locking element and the locked element, so that the breakable thin-walled line of the inside plug is broken and the deformation region is deformed.

Container lid composed of inside plug and lid body

A cap-type synthetic resin container lid is easily removable from a container without separating to form scrap pieces, The container lid includes thin-walled inversion pieces that extend upward beyond a top panel wall from their lower ends which connect to the outer surface of a skirt wall, a restraint wall that is connected to the upper ends of the thin-walled inversion pieces and that has a specific site in the circumferential direction, and an operating section connected to the outer surface of the skirt wall via a connecting piece that extends radially out from the skirt wall at a position in alignment with the specific site. Locked projections and locking projections, on the restraint wall and the connecting piece respectively, restrict expansion of the restraint wall.

Synthetic resin container lid

Growing community of inventors

Kanagawa, Japan

Masataka Iyadomi