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US 3,990,603 AGranted
Easy open closure system
AssigneeMinnesota Mining and Manufacturing Company
InventorWilfred R. Brochman
Life of this patent
Estimating the term…
Abstract
An improved easy open closure system is described, the closure system being particularly useful for cans containing carbonated beverages. The closure system comprises an exterior tape (having specified properties) which is adhesively secured to the portion of the container surrounding a pre-formed opening, and an interior sheet material (having specified properties) which covers the underside of the opening and is adhesively secured to the exterior tape in the area of the opening.
Claims24
An end portion for a container, said end portion having a pre-formed opening and an easy open closure system for said opening, wherein said closure systems comprises:
- a. an exterior tape circumjacent said opening, said tape being peelable by hand from the exterior of said end portion surrounding said opening, sait tape comprising:
- i. a flexible backing member at least 6.3 mm in width and about 25-250 microns in thickness which neither breaks nor elongates more than 25% under a tension of 4 pounds (1.8 kg.) and is capable of being pulled back upon itself without rupturing;
- ii. a uniform coating of adhesive, less than 250 microns in thickness, which adhesive coating is firmly anchored to said backing member;
- wherein said adhesive affords resistance to dead load shear of at least 17.6 p.s.i. (1.24 kg/cm.sup.2) for at least 1000 minutes at 200.degree. F. (93.degree. C.);
- wherein said exterior tape has a peel resistance within the range of about 4 to 12 pounds per inch width (0.7 to 2.1 kg. per cm. width) at temperatures from at least 35.degree. F. to 100.degree. F. (2.degree. to 38.degree. C.);
- b. an interior sheet material which covers the underside of said opening and which is firmly adhered to the bottom surface of said end portion circumjacent said opening and is further adhesively secured to said exterior tape in the area of said opening, said interior sheet material comprising:
- i. a backing member of about 15 to 50 microns in thickness and having a ppt value in the range of about 15 to 200 grams/ply;
- ii. a layer of adhesive, having a thickness of about 3 to 50 microns, firmly adhering said backing member to said end portion, wherein said adhesive affords resistance to dead load shear of at least 17.6 p.s.i. (1.24 kg/cm.sup.2) for at least 1000 minutes at 200.degree. F. (93.degree. C.) and has resistance to peel from said exterior tape in said opening in excess of 12 pounds per inch width (2.1 kg. per cm. width) at temperatures from at least 35.degree. F. to 100.degree. F. (2.degree. to 38.degree. C.);
- wherein at least one of said exterior tape and said interior sheet material is moisture-impervious, and wherein said pre-formed opening has a pressure-relief opening associated therewith.
6 more elements
In a container having a pre-formed opening and an easy open closure system for said opening, wherein the improvement comprises a closure system which comprises:
- a. an exterior tape circumjacent said opening, said tape being peelable by hand from the exterior of said end portion surrounding said opening, said tape comprising:
- i. a flexible backing member at least 6.3 mm in width and about 25-250 microns in thickness which neither breaks nor elongates more than 25% under a tension of 4 pounds (1.8 kg.) and is capable of being pulled back upon itself without rupturing;
- ii. a uniform coating of adhesive, less than 250 microns in thickness, which adhesive coating is firmly anchored to said backing member;
- wherein said adhesive affords resistance to dead load shear of at least 17.6 p.s.i. (1.24 kg/cm.sup.2) for at least 1000 minutes at 200.degree. F. (93.degree. C.);
- wherein said exterior tape has a peel resistance within the range of about 4 to 12 pounds per inch width (0.7 to 2.1 kg. per cm. width) at temperatures from at least 35.degree. F. to 100.degree. F. (2.degree. to 38.degree. C.);
- b. an interior sheet material which covers the underside of said opening and which is firmly adhered to the bottom surface of said end portion circumjacent said opening and is further adhesively secured to said exterior tape in the area of said opening, said interior sheet material comprising:
- i. a backing member of about 15 to 50 microns in thickness and having a ppt value in the range of about 15 to 200 grams/ply;
- ii. a layer of adhesive, having a thickness of about 3 to 50 microns, firmly adhering said backing member to said end portion, wherein said adhesive affords resistance to dead load shear of at least 17.6 p.s.i. (1.24 kg/cm.sup.2) for at least 1000 minutes at 200.degree. F. (93.degree. C.) and has resistance to peel from said exterior tape in said opening in excess of 12 pounds per inch width (2.1 kg. per cm. width) at temperatures from at least 35.degree. F. to 100.degree. F. (2.degree. to 38.degree. C.);
- wherein at least one of said exterior tape and said interior sheet material is moisture-impervious, and wherein said pre-formed opening has a pressure-relief opening associated therewith.
6 more elements
Dependencies are inferred from the claim text.