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US 4,399,924 AGranted
Cap
AssigneeTetra Pak Developpement SA
InventorErling I. Nilsson
Life of this patent
Estimating the term…
Abstract
The invention relates to a cap for containers intended for the keeping of pressurized contents. The cap has two parts, joined along a tearing indication. The two parts along their lower edge zones, are bridged by a disc of gastight aluminum foil, adapted so that it is torn up along an annular rupture line when the cap is opened.
Claims13
A closure for the mouth of a container comprising:
- an outer body having a central opening forming a pouring channel, said outer body including first sealing means for engaging and sealing said outer body in the mouth of a container, said outer body having an annular surface at one end thereof;
- an inner body adapted to be received within the central opening of said outer body, said inner body having an annular surface at one end thereof, the respective annular surfaces of said outer and inner bodies being substantially aligned;
- a gas-tight disc extending across said annular surfaces of said outer body and said inner body;
- and
- second sealing means for sealing said annular surfaces to said disc, said disc having a coating on the side opposite said annular surfaces whereby when said closure is inserted in a container, said disc prevents gas from escaping through said closure and said disc does not come in contact with the contents of said container.
2 more elements
A cap for a mouth portion of a container for pressurized contents, the mouth portion having an annular inwardly directed lip, said caps comprising:
- a tubular outer body of plastic having a central opening forming a pouring channel, said outer body including on an outer periphery thereof a plurality of flexible sealing projections and a plurality of flanges for holding, in a gastight manner, said outer body on the mouth portion of the container, said outer body having an annular surface at a lower end thereof;
- a stopper-like inner body of plastic integral with said outer body and inserted into said pouring channel, said inner body being connected to said outer body along a readily breakable annular zone, said inner body having an annular surface at a lower end thereof;
- and
- a disc of metal foil adhered to said annular surfaces of said outer body and said inner body to prevent a seepage of gas from said container to a space between said outer body and said inner body before said inner body is torn from said outer body thereby also tearing said disc, said metal foil disc having a coating of thermoplastic material on the side of said disc opposite said annular surfaces to prevent contact between said metal foil disc and the contents of the container.
1 more element
Dependencies are inferred from the claim text.