Vented closure

Claim 2

A closure for sealing the mouth opening of a container for a pressurizable product, said mouth being formed by a finish rim of the container, comprising a liner cap having a disc-like portion covering the mouth opening of the container, said liner being comprised of an elastomeric material, a vent means in the central area of said disc-like portion for conducting pressurized media from within the container, an outer cap having a top portion overlying the disc-like portion of said liner cap and a radial annular integral skirt portion surrounding the finish rim and securing the closure on the container, means sealing the outer surface of said disc-like portion to the underside of the outer cap in an endless configuration extending around said vent means, and a rupturable, convenience-opening tear strip formed in said top portion of the cap and extending through said ring of the attaching means for liner and outer caps.

Claim 3

The closure defined in claim 1, wherein said sealing means comprises a ring pattern of adhesive encircling the vent means in the disc-like portion of said liner cap.

Claim 4

The closure defined in claim 2, wherein the liner cap elastomeric material is a polymer and the outer cap is comprised of aluminum.

Claim 5

The closure defined in claim 3, wherein the adhesive comprises a vinyl chloride, vinyl acetate copolymer.

Claim 6

The closure defined in claim 4, wherein the copolymer adhesive is a coating on the underside of the aluminum outer cap top portion and said ring pattern encircling the vent means is a ring band of said copolymer that is activated by heat to sealingly bond an annular band area of the metal top portion and liner cap disc-like portion together, said bonded area being relatively high in shear strength and relatively low in peel strength.

Claim 7

The closure defined in claim 5, wherein said polymer is poly vinyl chloride.

Claim 8

A closure for sealing the mouth opening of a container for a pressurizable product, said mouth being formed by a finish rim of the container, comprising a liner cap having a disc-like portion covering the mouth opening of the container, said liner being comprised of an elastomeric material, a vent means in the central area of said disc-like portion for conducting pressurized media, an outer cap having a top portion overlying the disc-like portion of said liner cap and a radial annular integral skirt portion surrounding the finish rim and securing the closure on the container, an adhesive forming thermosplastic bonding the outer surface of said disc-like portion and the underside of the outer cap in an endless, band-like configuration around said vent means, and a rupturable, convenience-opening tear strip formed in said top portion of the outer cap and extending through said band of the bonding adhesive.

Claim 9

A closure for sealing the mouth opening of a container for a pressurizable product, said mouth being formed by a finish rim of the container, comprising a liner cap having a disc-like portion covering the mouth opening of the container, said liner being comprised of an elastomeric material, a vent means in the central area of said disc-like portion for conducting pressurized media, an outer cap having a top portion overlying the disc-like portion of said liner cap and a radial annular integral skirt portion surrounding the finish rim and securing the closure on the container, an adhesive forming thermosplastic bonding the outer surface of said disc-like portion and the underside of the outer cap in an endless, band-like configuration around said vent means, and a rupturable, convenience-opening tear strip formed in said top portion of the outer cap and extending through said band of the bonding adhesive.

Claim 10

The closure defined in claim 7, wherein said adhesive forming thermoplastic comprises an alkali-metal containing ionic copolymer.

Claim 11

The closure defined in claim 8, wherein the liner cap elastomeric material is a polymer and the outer cap is comprised of aluminum.

Claim 12

The closure defined in claim 9, wherein said polymer is polyethylene.

Claim 13

The closure defined in claim 9, wherein said polymer is polypropelene.

Claim 14

The closure defined in claim 9, in which a coating of said copolymer is applied to the undersurface of the outer cap and heat bonded to seal the outer cap and liner cap together throughout said band-like configuration and encircling the vent means of said liner cap.

Claim 15

The closure defined in claim 8, wherein said elastomeric material is A.B.S. plastic.

Claim 16

A closure for sealing the mouth opening of a container pressurizable to a differential pressure, said mouth being defined by an annular rim, comprising a metal outer cap having a mouth covering portion and a radial integral skirt portion surrounding said rim and securing the closure on the container, a tear strip removal device formed in said metal cap and extending through at least a part of said mouth covering portion, a liner cap of plastic material adapted to telescope over said rim and underlying the metal outer cap, said liner cap having a top portion covering said rim and an annular, integral, radial skirt, a vent aperture through said top portion, and an annular band of an adhesive forming thermosplastic bonding the outer surface of said top portion and the underside of said mouth covering portion disposed around said vent aperture, the tear strip in said latter-mentioned portion extending across said band, said band area providing a sealed space around said aperture receiving pressure from said aperture equal to pressure in the closed container, whereby removal of the tear strip progressively vents said space and said aperture to atmosphere.

Claim 17

A closure for sealing the mouth opening of a container pressurizable to a differential pressure, said mouth being defined by an annular rim, comprising a metal outer cap having a mouth covering portion and a radial integral skirt portion surrounding said rim and securing the closure on the container, a tear strip removal device formed in said metal cap and extending through at least a part of said mouth covering portion, a liner cap of plastic material adapted to telescope over said rim and underlying the metal outer cap, said liner cap having a top portion covering said rim and an annular, integral, radial skirt, a vent aperture through said top portion, and an annular band of an adhesive forming thermosplastic bonding the outer surface of said top portion and the underside of said mouth covering portion disposed around said vent aperture, the tear strip in said latter-mentioned portion extending across said band, said band area providing a sealed space around said aperture receiving pressure from said aperture equal to pressure in the closed container, whereby removal of the tear strip progressively vents said space and said aperture to atmosphere.

Claim 18

The closure defined in claim 14, wherein thE adhesive forming thermoplastic is a vinyl chloride, vinyl acetate copolymer.

Claim 19

The closure defined in claim 14, wherein the adhesive forming thermoplastic is an alkali-metal containing ionic copolymer.