Pinch bottom open mouth bag

Abstract

A pinch bottom open mouth bulk material bag fabricated from polywoven material has closures at one or both ends that are non-sewn and which comprise a strip of tape running in the cross-bag direction. The tape is folded over the respective bag end, which may be modified, and is glued in place to close the end. The closure has no holes or other openings through which contaminants may enter the bag interior.

1 . A bulk material bag comprising:
 a bag body having an interior layer of paper, an exterior layer of paper, and a layer of polywoven material between the interior and exterior paper layers, said bag body having an open end, gusseted opposed lateral side edges to define a bag front panel and a bag rear panel, the bag body at the open end further having an end edge of the bag rear panel extending beyond the end edge of the bag front panel,   wherein each gusseted opposed lateral side edge is cut to define stepped exposed first and second tabs between the end edge of the bag rear panel and the end edge of the bag front panel,   and wherein said exposed tabs between the end edge of the bag rear panel and the end edge of the bag front panel and that portion of said bag rear panel that extends beyond the end edge of the bag front panel define a closure flap at the open end, and   adhesive coated onto the closure flap.   
     
     
         2 . The bulk material bag according to  claim 1  wherein the end edge of the bag rear panel extends beyond the exposed first and second tabs. 
     
     
         3 . The bulk material bag according to  claim 2  wherein the open end is closed by folding the closure flap over the bag front panel so that the adhesive on the closure flap adheres to the bag front panel. 
     
     
         4 . The bulk material bag according to  claim 3  further including a closed end defined by the bag body having a closed end edge of the bag front panel extending beyond a closed end edge of the bag rear panel and wherein each gusseted opposed lateral side edge is cut to define stepped exposed first and second tabs between the closed end edge of the bag rear panel and the closed end edge of the bag front panel, and wherein said exposed tabs between the closed end edge of the bag rear panel and the closed end edge of the bag front panel and that portion of said bag front panel that extends beyond the closed end edge of the rear panel define a closed end closure flap, and wherein the closed end is closed by folding the closure flap over the bag rear panel so that the adhesive on the closure flap adheres to the bag rear panel. 
     
     
         5 . The bulk material bag according to  claim 3  in which the adhesive is a hot melt adhesive. 
     
     
         6 . The bulk material bag according to  claim 4  in which the adhesive is a hot melt adhesive. 
     
     
         7 . The bulk material bag according to  claim 6  in which the closed end is closed before the bag is delivered to consumers. 
     
     
         8 . A bulk material bag comprising:
 a bag body having a longitudinal axis, a closed end and an open end, said bag body having an interior paper layer, an exterior paper layer, and a layer of polywoven material sandwiched between the interior and exterior paper layers, the bag body having opposed side edges, a front panel and a rear panel;   at the closed end, the front panel having an end edge that extends beyond the end edge of the rear panel to define a closure flap, adhesive applied to the closure flap, and the closure flap folded over the rear panel so that the exterior paper layer of the front panel is adhered to the exterior paper layer of the rear panel;   at the open end, the rear panel having an end edge that extends beyond the end edge of the front panel to define a closure flap, and adhesive applied to the closure flap.   
     
     
         9 . The bulk material bag according to  claim 8  wherein the open end is closed by folding the closure flap onto the front panel so that the exterior paper layer of the rear panel is adhered to the exterior paper layer of the front panel. 
     
     
         10 . The bulk material bag according to  claim 9  wherein the opposed side edges of the bag body are defined by gussets, and wherein each gusset is defined by two gusset panels, each having an end edge at the open end, and wherein the end edges of the two gusset panels are cut to define stepped exposed first and second tabs between the end edge of the rear panel and the end edge of the front panel. 
     
     
         11 . The bulk material bag according to  claim 10  wherein the end edge of the rear panel extends beyond the stepped exposed first and second tabs. 
     
     
         12 . The bulk material bag according to  claim 11  wherein the closure flap includes the exposed first and second tabs of each gusset and the rear panel where it extends beyond the end edge of the front panel. 
     
     
         13 . A bulk material bag comprising:
 a bag body having a closed end and an open end, said bag body having an interior paper layer, an exterior paper layer, and a layer of polywoven material between the interior and exterior paper layers, the bag body having gusseted opposed side edges, a front panel and a rear panel;   closed end closure means for providing direct attachment between a portion of the exterior paper layer of the front panel and a corresponding portion of the exterior paper layer of the rear panel; and   open end closure means for providing direct attachment between a portion of the exterior paper layer of the rear panel and a corresponding portion of the exterior paper layer of the front panel.   
     
     
         14 . The bulk material bag according to  claim 13  wherein the open end closure means further comprises the rear panel having an end edge that extends beyond an end edge of the front panel, and wherein each of the gussets of the opposed side edges defines stepped, exposed tabs that extend beyond the end edge of the front panel. 
     
     
         15 . The bulk material bag according to  claim 14  wherein the end edge of the rear panel extends beyond the stepped, exposed tabs of the gussets. 
     
     
         16 . The bulk material bag according to  claim 15  wherein the open end closure means further comprises adhesive applied to the exposed portions of the rear panel and the exposed tabs of the gussets. 
     
     
         17 . The bulk material bag according to  claim 16  wherein the adhesive is a hot melt adhesive.