Web for fluid filled unit formation

  • US 7,550,191 B2
  • Filed: 10/17/2005
  • Issued: 06/23/2009
  • Est. Priority Date: 04/08/2003
  • Status: Active Grant
First Claim
Patent Images

1. A web for the manufacture of fluid filled units comprising:

  • an elongate heat sealable, flattened plastic face and back layers including imperforate sections;

    the layers being imperforately joined together at a side edge by a selected one of a fold and a seal;

    the layers being joined by longitudinally spaced transverse seals, each transverse seal extends from the side edge and terminates in a spaced relationship with a fill edge of the layers;

    transverse lines of weakness extending from the side edge to the fill edge in a longitudinal direction of the seals that allow adjacent pouches to be separated;

    the side edge and transverse seals and lines of weakness together delineating a string of pouches with each pouch having two imperforate sections, three imperforate sides and a centrally located fill opening at its fourth side; and

    ,the transverse lines of weakness being defined by spaced perforations extending through both layers with the perforations nearest to the fill edge of the layers being shorter in length than the lengths of other perforations that are spaced further from the fill edge and extend toward the side edge.

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