Composite film bag for packaging bulk products

Abstract

The present invention relates to a multi-layered composite bag used to store bulk type products such as pet food, seeds, fertilizer, cereals, grains, charcoal, sand, gravel, and other bulk products, including without limitation bulk products intended for human and non-human consumption, and provides a more efficient manufacturing process than using a paper/plastic structure. The present invention provides a bag comprising a middle layer of woven mesh tubing to which an outer layer of solid plastic film is adhered using polypropylene or other polylaminates.

1 . A composite bag for packaging bulk products, which comprises (a) a layer of polymeric solid film and (b) a layer of polymeric mesh woven fabric, wherein a tie resin added during manufacture of said composite bag adheres (a) to (b), said composite bag being sealed on one end during manufacture.  
   
   
       2 . The composite bag as recited in  claim 1 , wherein said layer of polymeric solid film comprises a material selected from the group consisting of low density polyethylene, high density polyethylene, linear low density polyethylene, metallocene, polyester, polypropylene coated with polyethylene, and combinations thereof.  
   
   
       3 . The composite bag as recited in  claim 1 , wherein said layer of polymeric mesh woven fabric comprises a material selected from the group consisting of low density polyethylene, linear low density polyethylene, polypropylene coated with polyethylene, high density polyethylene, metallocene, copolymers of ethylene and propylene, polyesters, polyamides, polyvinyl polymers, and combinations thereof.  
   
   
       4 . The composite bag as recited in  claim 1 , wherein at least one of said layers of polymeric solid film and said layer of polymeric mesh woven fabric comprises a polylactic acid.  
   
   
       5 . The composite bag as recited in  claim 1 , wherein at least one end of said composite bag is rolled during manufacture, forming a fold in said composite bag.  
   
   
       6 . The composite bag as recited in  claim 5 , wherein a tear strip is within said fold.  
   
   
       7 . The composite bag as recited in  claim 1 , wherein said composite bag is resealable.  
   
   
       8 . The composite bag as recited in  claim 5 , further comprising within said fold at least one of the following: (a) a male strip intersecting with a female groove; (b) slider tabs; (c) metal tabs; (d) hook-and-loop-type closure strips; (e) a conventional zipper; and (f) a re-joinable adhesive release liner.  
   
   
       9 . The composite bag as recited in  claim 1 , further comprising side gussets.  
   
   
       10 . The composite bag as recited in  claim 6 , wherein said tear strip is formed by a laser.  
   
   
       11 . A method of manufacturing a composite bag for packaging bulk products, which comprises: (a) feeding through a nip roller device a combination of a polymeric solid film in roll form and a polymeric mesh woven fabric that is shaped into a tubular structure, with a tie resin added during manufacture to adhere said combination, wherein a flattened tube laminated or adhered on both sides to a polymeric solid film in the form of a roll is formed; and (b) cutting said roll into individual composite bags, wherein each composite bag is sealed on one end.  
   
   
       12 . The method as recited in  claim 11 , wherein said polymeric solid film comprises a material selected from the group consisting of low density polyethylene, high density polyethylene, linear low density polyethylene, metallocene, polyester, polypropylene coated with polyethylene, and combinations thereof.  
   
   
       13 . The method as recited in  claim 11 , wherein said polymeric mesh woven fabric comprises a material selected from the group consisting of low density polyethylene, linear low density polyethylene, polypropylene coated with polyethylene, high density polyethylene, metallocene, copolymers of ethylene and propylene, polyesters, polyamides, polyvinyl polymers, and combinations thereof.  
   
   
       14 . The method as recited in  claim 11 , wherein at least one of said layer of polymeric solid film and said layer of polymeric mesh woven fabric comprises a polylactic acid.  
   
   
       15 . The method as recited in  claim 11 , wherein one end of said composite bag is rolled during manufacture, forming a fold in said composite bag.  
   
   
       16 . The method as recited in  claim 15 , wherein a tear strip is within said fold.  
   
   
       17 . The method as recited in  claim 11 , wherein said composite bag is resealable.  
   
   
       18 . The method as recited in  claim 15 , further comprising within said fold: (a) a male strip intersecting with a female groove; (b) slider tabs; (c) metal tabs; (d) hook-and-loop-type closure strips; (e) a conventional zipper; and (f) a re-joinable adhesive release liner.  
   
   
       19 . The method as recited in  claim 11 , wherein said composite bag further comprises side gussets.  
   
   
       20 . The method as recited in  claim 16 , wherein said tear strip is formed by a laser.