Patent ID: 7090904
Filing Date: 2006-08-15
Classification: B32B,B65B,B65D,Y10T

Abstract:
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 position defined by the first and second track strips being spaced apart to allow access to inner portions of the bag and a sealingly closed position defined by the first and second track strips abuttingly contacting each other to prevent ready access to the inner portions of the bag; 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; a plurality of gussets formed between the outer front wall region and the outer back wall region, at least a first one of the plurality of gussets being formed in a first region between the outer front and back wall regions so as to define a first outer side wall region and at least a second one of the plurality of gussets being formed in a second region between the outer front and back wall regions so as to define a second outer side wall region positioned opposite the first outer side wall region, and wherein the bag further comprises an adhesive material positioned adjacent the plurality of gussets to thereby define a plurality of sealed gussets to increase drop and abuse resistance of the bag, to reduce the risk of access to contents of a bag by a pest, and to reduce sifting of filling material when positioned in the bag; and an external reinforcement positioned adjacent the open end of the outer tube and adapted to overlie and cover regions of the front and back wall regions adjacent to each of the sealed gussets to thereby enhance the strength and stiffness of each of the sealed gussets and further reduce the risk of access to contents of the bag by a pest.