Multiwall bag having slider zipper and fin combination and associated methods

  • US 20040091648A1
  • Filed: 11/08/2002
  • Published: 05/13/2004
  • Est. Priority Date: 11/08/2002
  • Status: Active Grant
First Claim
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1. A multiwall bag of tubular form comprising:

  • an inner tube having at least one layer of polymeric material including an inner front wall region and an inner back wall region positioned to face opposite the inner front wall region;

    an outer tube having at least one layer of paper material and positioned to substantially surround outer surfaces of the inner tube, the outer tube having an open end region, a closed end region being initially in an open position, adapted to receive filling material therethrough, and then sealingly closed to a closed position, an outer front wall region positioned between the open end region and the closed end region, and an outer back wall region positioned between the open end region and the closed end region and positioned to face opposite the outer front wall region;

    a bag seal zone formed adjacent the open end of the outer tube so that the at least one layer of polymeric material of inner surfaces of the inner front wall region of the inner tube abuttingly contacts and seals to inner surfaces of the inner back wall region of the inner tube;

    a fin member formed of a plastic material and connected to the bag seal zone and extending substantially the entire lateral extent of and along the outer front and back wall regions, the fin member including at least a pair of spaced-apart elongate fin strips positioned to face opposite each other;

    a zipper track connected to each of the pair of elongate fin strips of the fin member, the zipper track including a first track strip and a second track strip, the first and second track strips being adapted to positioned between an open positioned defined by the first and second track strips being spaced apart to allow access to inner portions of the bag and a sealingly closed positioned defined by the first and second track strips abuttingly contacting each other to prevent ready access to the inner portions of the bag; and

    a zipper block slidably connected to the zipper track to allow the zipper block to slidably move along the zipper track and move the first and second track strips between the open position and the closed position, the fin member, the zipper track, and the zipper block defining a slider zipper and fin combination.

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