Method of making a heat shrinkable bag
AssigneeCadillac Products, Inc.
InventorKarl F. Barnett
Life of this patent
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Abstract
A preformed bag-like enclosure formed of heat shrink plastic film for shrink wrapping pallet loads or the like, the enclosure being generally tubular or sleeve-like in shape and provided with a reduced size opening at the top to prevent the enclosure from slipping down over the load to be wrapped prior to the application of heat for shrinking. In one embodiment the top opening is reduced in size by tapering same using upwardly and inwardly extending heat seals, in another by providing transversely extending heat seals and in further ones by providing inwardly spaced spot welds. Methods of fabrication of the latter type are also disclosed.
Claims1
The method of fabricating a shrink wrap, comprising the steps of:
- forming a gussetted sleeve-like enclosure;
- positioning a separator between the opposed portions of each of the gussetted sides of said enclosure proximate to an end of said enclosure when the latter is collapsed to prevent said portions from contacting one another;
- and applying heat to a localized spot on the plies of said enclosure by piercing said enclosure with a heated needle that is adapted to piece the portions of said enclosure on both sides of said separator as well as said separator whereby localized heat seals are formed between said ply proximate to said end of said enclosure, said heat seals being wholly spaced from the side edges of said collapsed enclosure.
Dependencies are inferred from the claim text.