Industrial bag having a fluid drainage layer

Abstract

The present invention relates to an industrial bag comprising a composite fabric comprising a porous fluid drainage layer and a fibrous fluid barrier layer of a flash spun polyolefin plexifilamentary film-fibril sheet wherein the fibrous fluid barrier layer faces the interior of the industrial bag.

1 . An industrial bag comprising a composite fabric comprising a porous fluid drainage layer and a fibrous fluid barrier layer of a flash spun polyolefin plexifilamentary film-fibril sheet wherein the fibrous fluid barrier layer faces the interior of the industrial bag. 
     
     
         2 . The industrial bag of  claim 1  wherein the fluid drainage layer is selected from the group consisting of nonwoven fabrics, woven fabrics, knit fabrics, three-dimensional meshes, and combinations thereof. 
     
     
         3 . The industrial bag of  claim 2  wherein the nonwoven fabric is a spunbonded nonwoven. 
     
     
         4 . The industrial bag of  claim 1  wherein the fluid drainage layer comprises fibers of a polymer selected from the group consisting of polyolefins, polyesters, polyamides, and combinations thereof. 
     
     
         5 . The industrial bag of  claim 1  wherein the fluid drainage layer is non-absorbent. 
     
     
         6 . The industrial bag of  claim 1  wherein the fluid drainage layer is absorbent. 
     
     
         7 . The industrial bag of  claim 1  wherein the fluid drainage layer is textured, creped, embossed or calendered to facilitate the passage of fluid throughout the plane of the fluid drainage layer. 
     
     
         8 . The industrial bag of  claim 1  wherein the fluid drainage layer is treated with a fluorine-containing compound. 
     
     
         9 . The industrial bag of  claim 1  wherein the polyolefin is polyethylene. 
     
     
         10 . The industrial bag of  claim 1  wherein the fluid barrier layer is textured, creped, embossed or calendered. 
     
     
         11 . The industrial bag of  claim 1  wherein the fluid barrier layer is treated with a fluorine-containing compound. 
     
     
         12 . The industrial bag of  claim 1  wherein the fluid drainage layer is bonded to the fibrous fluid barrier layer by means of adhesive bonding, thermal bonding, ultrasonic bonding, solvent bonding or any combination thereof. 
     
     
         13 . The industrial bag of  claim 1  wherein the composite fabric is calendered. 
     
     
         14 . The industrial bag of  claim 1  wherein the mean flow pore size of the fluid drainage layer is greater than the mean flow pore size of the fibrous fluid barrier layer. 
     
     
         15 . The industrial bag of  claim 1  further comprising an outer fabric layer disposed adjacent to the fluid drainage layer opposite the fluid barrier layer and/or an inner fabric layer disposed adjacent to the fluid barrier layer opposite the fluid drainage layer. 
     
     
         16 . The industrial bag of  claim 15  wherein the outer and inner fabric layers are nonwoven fabrics. 
     
     
         17 . The industrial bag of  claim 15  wherein the outer and inner fabric layers comprise fibers of a polymer selected from the group consisting of cotton, polyamides, polyesters, polyacrylics, polyolefins, and combinations thereof. 
     
     
         18 . The industrial bag of  claim 15  wherein the outer and inner fabric layers are bonded to the composite fabric by means of adhesive bonding, thermal bonding, ultrasonic bonding, solvent bonding or any combination thereof. 
     
     
         19 . The industrial bag of  claim 15  wherein any layer is treated with a fluorine-containing compound. 
     
     
         20 . An industrial bag comprising a composite fabric comprising a porous fluid drainage layer of a spunbond nonwoven and a fibrous fluid barrier layer of a flash spun polyolefin plexifilamentary film-fibril sheet wherein the fibrous fluid barrier layer faces the interior of the industrial bag. 
     
     
         21 . The industrial bag of  claim 20  further comprising an outer fabric layer disposed adjacent to the fluid drainage layer opposite the fluid barrier layer and/or an inner fabric layer disposed adjacent to the fluid barrier layer opposite the fluid drainage layer.