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US 4,294,367 AGranted
Container having rimmed shrink cap
AssigneeAsahi Breweries, Ltd.
InventorsChikao Otsuka, Reinosuke Hara, Yoshito Shigenaka
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AssigneeAsahi Breweries, Ltd.
InventorsChikao Otsuka, Reinosuke Hara, Yoshito Shigenaka
Estimating the term…
A container having a rimmed shrink cap closing the mouth thereof. The shrink cap comprises a cover made of a nonshrinkable material and having an outer diameter somewhat larger than the external diameter of the tubular mouth of the container. The shrink cap also comprises a tubular skirt portion made of a shrinkable material. The upper end of the tubular skirt portion has substantially the same outer diameter as that of said cover. The skirt portion of the cap is shrunk so that the lower portion of the skirt is in tight sealing contact with the neck of the container and the upper edge portion of the cap is formed in the shape of a laterally outwardly projecting rim. Because of the thus-formed rim, the cap can readily be twisted so that it can be removed from the tubular mouth of the container.
In combination with a container having a tubular neck and a mouth at the upper end of said neck, a rimmed shrink cap comprising a disc-shaped cover having a diameter which is from 10 to 40% larger than the outer diameter of the mouth of the container, said cover being made of a nonshrinkable material, a tubular skirt overlying the top surface of said cover and extending downwardly from the perimeter of said cover, said skirt being made of a heat-shrinkable material, said cap being positioned so that said cover is substantially concentric with and overlies and closes the mouth of the container, and the lower portion of said skirt surrounds the tubular neck of the container and is heat-shrunk into tight sealing contact with the exterior wall of the tubular neck of the container below the mouth, the outer edge portion of said disc-shaped cover projecting radially outwardly beyond the outer edge of the mouth and forming an annular rim above said mouth, the upper portion of said skirt being exposed to but spaced outwardly from the outer edge of said tubular mouth and the outer surface of the portion of said neck adjacent to said mouth, said rim allows said cap to be readily torn off with ones fingers.
In combination with a container having a tubular neck ending in a tubular mouth, a closure for said tubular mouth comprising a cover disc made of a nonshrinkable material and overlying and closing said mouth, said cover disc having a diameter which is from 10 to 40% larger than the outer diameter of said tubular mouth so that the laterally outer portion of said cover disc projects radially outwardly beyond the outer wall of said mouth, a cylindrical skirt extending from the perimeter of said cover disc with the lower portion of said skirt being heat-shrunk onto the sidewall of said neck in sealed relationship therewith, the upper portion of said skirt smoothly flaring upwardly and outwardly to meet the perimeter of said cover disc and overlie the top surface of said cover disc above said mouth and with said cover disc perimeter forming a manually twistable rim on the closure, a single, circumferentially extending line of perforations through said skirt at the location thereon whereat said upper portion of said skirt begins to flare away from said neck, at least one pair of circumferentially spaced, axially extending lines of perforations extending downwardly from said location where said skirt begins to flare away from said neck and terminating in notches in the lower edge of said skirt for shearing of said skirt along said axially extending lines in response to twisting of said rim, whereby said rim allows said closure to be readily torn off with ones fingers.
Dependencies are inferred from the claim text.