Method for closing and sealing a woven polymeric bag

Abstract

A method for sealing a bag which is formed from a tube of material and has front and rear sides, a pair of opposing, inward-tending gusset folds, each of these folds having front and rear vertical creases, comprising the steps of slitting each of the opposing front creases along longitudinal their axes, obtaining front and rear plies. A first rearward fold is formed by rearwardly folding the rear plies together with the rear vertical creases such that the inner surface of the rear ply is visible. A second rearward fold is formed by rearwardly folding the first fold until the inner surface of the rear ply lays against the rear side of the bag.

1 . A method for sealing a bag, said bag formed from a tube of material and having front side and a rear side, and a pair of opposing, inward-tending gusset folds, each of said folds having front and rear vertical creases, said method comprising the steps of:
 a. slitting each of said front creases along longitudinal axes thereof, thereby obtaining front and rear plies;   b. forming a first rearward fold by rearwardly folding said rear plies together with said rear vertical creases such that an inner surface of said rear ply is visible; and   c. forming a second rearward fold by rearwardly folding said first fold wherein said inner surface of said rear ply lays against said rear side of said bag.   
     
     
         2 . The method of  claim 1 , further comprising the step of depositing an adhesive upon said inner surface of said rear ply. 
     
     
         3 . The method of  claim 2 , further comprising the step of depositing said adhesive upon the rear side of said bag where said inner surface lays against it. 
     
     
         4 . The method of  claim 3 , wherein said material is polypropylene. 
     
     
         5 . The method of  claim 1 , wherein said material is polypropylene. 
     
     
         6 . The method of  claim 5 , further comprising the step of depositing an adhesive upon said inner surface of said rear ply. 
     
     
         7 . The method of  claim 6 , further comprising the step of depositing said adhesive upon the rear side of said bag where said inner surface lays against it. 
     
     
         8 . A flexible bag formed from a tube of material and having front side and a rear side, and a pair of opposing, inward-tending gusset folds, each of said folds having front and rear vertical creases, said bag having at least one sealed closure formed by a method comprising the steps of:
 a. slitting each of said front creases along longitudinal axes thereof, thereby obtaining front and rear plies;   b. forming a first rearward fold by rearwardly folding said rear plies together with said rear vertical creases such that an inner surface of said rear ply is visible; and   c. forming a second rearward fold by rearwardly folding said first fold wherein said inner surface of said rear ply lays against said rear side of said bag.   
     
     
         9 . The bag of  claim 8 , wherein said method further comprises the step of depositing an adhesive upon said inner surface of said rear ply. 
     
     
         10 . The bag of  claim 9 , wherein said method further comprises the step of depositing said adhesive upon the rear side of said bag where said inner surface lays against it. 
     
     
         11 . The bag of  claim 10 , wherein said material is polypropylene. 
     
     
         12 . The bag of  claim 8 , wherein said material is polypropylene. 
     
     
         13 . The bag of  claim 12 , wherein said method further comprises the step of depositing an adhesive upon said inner surface of said rear ply. 
     
     
         14 . The bag of  claim 13 , wherein said method further comprises the step of depositing said adhesive upon the rear side of said bag where said inner surface lays against it. 
     
     
         15 . A method of sealing a bag, said bag formed from a tube of material and having front side and a rear side, and a pair of lateral, opposing, inward-tending gusset folds, each of said folds having front and rear vertical creases, said method comprising the steps of:
 a. parting said material longitudinally along said front crease;   b. rolling a rear ply resulting from said step of parting along with rear portion of said bag proximal to said rear ply such that a surface of said rear ply opposes the rear side of said bag; and   c. applying an adhesive element to said surface, said adhesive being for the bonding of said surface with said rear side.   
     
     
         16 . The method of  claim 15 , wherein said step of applying adhesive further comprises applying adhesive to said rear side in the area contacted by said rear ply. 
     
     
         17 . The method of  claim 15 , wherein said material is polypropylene. 
     
     
         18 . A bag sealed by the method of  claim 15 . 
     
     
         19 . The bag of  claim 18 , wherein said step of applying adhesive further comprises applying adhesive to said rear side in the area contacted by said rear ply. 
     
     
         20 . The bag of  claim 19 , wherein said material is polypropylene. 
     
     
         21 . A flexible bag comprising:
 a tube of material comprising:
 a front side; 
 a rear side; 
 a pair of opposing, inward-tending gusset folds, each of said folds having front and rear vertical creases and each of said folds between said front side and said rear side; 
   at least one sealed closure comprising:
 a front ply and a rear ply, said front ply and said rear ply being separated by a slit along said front creases along longitudinal axes thereof, and said rear ply having an outer and inner surface; 
 a first rearward fold causing said outer surface of said rear ply to oppose a first portion of the rear side of the bag; and 
 a second rearward fold causing said inner surface of said rear ply to oppose a second portion of the rear side of the bag. 
   
     
     
         22 . The flexible bag of  claim 21  further comprising an adhesive upon said inner surface of said rear ply. 
     
     
         23 . The flexible bag of  claim 22  further comprising the adhesive upon the rear side of said flexible bag where said inner surface lays against it. 
     
     
         24 . The flexible bag of  claim 23 , wherein said tube of material is polypropylene. 
     
     
         25 . The flexible bag of  claim 21 , wherein said tube of material is polypropylene. 
     
     
         26 . The flexible bag of  claim 25 , further comprising an adhesive upon said inner surface of said rear ply. 
     
     
         27 . The flexible bag of  claim 26  further comprising the adhesive upon the rear side of said flexible bag where said inner surface lays against it.