Bag with Structure for Avoiding Bricking Appearance
OwnerStephen Graham Coulson, Michael Reid Martininventors
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Abstract
A bag structure has a hermetically sealed bag with an outer ply sealed to the bag to define a cavity. The cavity is bounded on one side by a part of the bag and bounded on another side by the outer ply. Perforations are formed through the outer ply to permit passage of gas from the atmosphere into and out of the cavity to reduce unsightly bricking. A one-way valve is formed in the hermetically sealed bag to permit passage of gas from the interior of the bag.
Claims19
A bag structure comprising a hermetically sealed bag and an outer ply bonded to the bag to define a generally flat cavity bounded on one side by a part of the bag and bounded on another side by the outer ply, a passage between the cavity and the exterior of the bag structure to permit passage of gas between the atmosphere and the interior of the cavity, and a one-way valve formed in the bag to permit escape of gas from the interior of the bag.
A method of manufacturing a bag structure comprising perforating a first web of plastic sheet material, overlapping a second web of plastic sheet material with the first web, installing a valve to extend through at least the second web, sealing the webs together over a first area of overlap, the first area of overlap extending around a second area of overlap to leave the webs separated at the second area thereby to define a cavity, with the perforation within said second area.
Dependencies are inferred from the claim text.