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US 2014/0287172 A1Published application
Patch Bag Having Separated Tear Initiators
AssigneeCryovac, Inc.
InventorsDavid M. Finley, Michael J. Rosinski
Life of this patent
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AssigneeCryovac, Inc.
InventorsDavid M. Finley, Michael J. Rosinski
Estimating the term…
A patch bag has a heat-shrinkable patch adhered to a heat-shrinkable bag and a skirt between a heat seal and an edge of the bag. The bag is made from a multilayer film with at least one film layer comprising an incompatible polymer blend so that after shrinking the film exhibits controlled tear direction. The bag skirt has a bag tear initiator for initiating a controlled direction tear to the opposite side of the bag. The patch has an edge with a patch tear initiator separated from the bag tear initiator but positioned along a tear line emanating from bag tear initiator, so that upon tearing the shrunken bag, the controlled tear propagates into the patch tear initiator and thereafter the shrunken bag and the shrunken patch tear together towards an opposite edge of the patch.
A patch bag comprising a heat-shrinkable patch adhered to a heat-shrinkable bag having an open top and a top edge, a closed bottom and a bottom edge, a first side edge, a second side edge, a first lay-flat side, a second lay-flat side, a heat seal of a region of the first lay-flat side to a region of the second lay-flat side, a first tear initiator in the first lay-flat side in a bag skirt outward of the heat seal or in a bag header between the patch and the top edge of the bag, a second tear initiator in the second lay-flat side in the bag skirt outward of the heat seal or in the bag header between the patch and the top edge of the bag, with at least a portion of the heat-shrinkable patch being adhered to an outside surface of the first lay-flat side of the bag, with the patch having a patch tear initiator located on an edge of the patch in a location separated from the first tear initiator, the patch tear initiator being aligned with an MD or TD tear line extending from the first bag tear initiator, with the heat shrinkable bag comprising a multilayer film having at least one layer comprising an incompatible polymer blend.
Dependencies are inferred from the claim text.