Hermetic seal and wide-mouthed bottle sealed by the seal

摘要

A hermetic seal for sealing a mouth of a wide-mouthed bottle having a body portion thinly formed by stretch blow molding, and a wide-mouthed bottle a mouth of which is sealed by the hermetic seal. A synthetic resin laminated sheet comprising an aluminum sheet or an aluminum foil as a base is punched into the same shape as a mouth of the wide-mouthed bottle to form the hermetic seal. The sheet is formed into a flat peripheral portion and a bellows inside the flat portion to have alternate multiple mountain and valley portions by press molding concurrently with the punching. The bellows is formed in a concentrical state or in a spiral state to prevent the deformation of the body portion caused by a reduced pressure inside the bottle resulting from cooling