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US 5,791,783 AGranted
Adhesive closure having enhanced burst strength for flexible bag
AssigneeDowbrands L.P.
InventorsJose Porchia, Brian C. Dais
Life of this patent
Estimating the term…
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AssigneeDowbrands L.P.
InventorsJose Porchia, Brian C. Dais
Estimating the term…
An adhesive closure including an adhesive strip affixed transversely across a first inner surface of a front wall of a bag at a preselected distance from the opening of the bag; and a flexible flap member strip affixed transversely across a second inner surface of a rear wall of the bag aligned on the wall opposite from the adhesive strip. The flexible flap member is attached to the inner surface of the wall along one edge of the flexible flap member. The flexible flap member is pressable against and into the adhesive strip, whereby a seal is formed by contacting the adhesive strip with the flexible flap member. The flexible flap member is adapted to provide a shear opening force from the inside of the bag when the flap member is contacting the adhesive strip, and adapted to provide a peel opening force from the outside of the bag when the flap member is contacting the adhesive strip. The peel opening force is smaller than the shear opening force, thereby providing an enhanced burst strength to the bag.
An adhesive closure on a reclosable thermoplastic bag comprising:
In a reclosable thermoplastic bag having two sidewalls, each sidewall having a top edge, two opposing side edges and a bottom edge, the two sidewalls being attached together along the respective side edges and bottom edges, the sidewalls forming a mouth of the bag adjacent to the top edges of the sidewalls, each sidewalls having an inner surface and an outer surface, the inner surfaces of the two sidewalls facing each other, an improved closure comprising:
Dependencies are inferred from the claim text.