Two-ply paper bag, a method of manufacturing such a bag, and the use of such a bag for packaging animal food

Abstract

A double-ply paper bag provided in the vicinity of its opening with a strip supporting closure means, said strip forming two substantially facing webs, with only of the two webs being fixed to the inside face of the inner ply of the bag prior to the bag being filled and closed. A method of manufacturing such a bag, and the use of said bag for packaging food for animals.

1 . A single- or double-ply paper bag, the bag being provided in the vicinity of its opening with a strip supporting closure means, said strip forming two webs substantially facing each other, only of the two webs being fixed to the inside face of the inner ply of the bag prior to the bag being filled and closed.  
     
     
         2 . A paper bag according to  claim 1 , wherein the inside face of the inner ply of the bag is coated in a polymer material.  
     
     
         3 . A bag according to  claim 1 , wherein the strip forming two webs and supporting the closure means is made of a polymer material.  
     
     
         4 . A bag according to  claim 2 , wherein the strip forming two webs and supporting the closure means is made of a polymer material, and wherein the web of the strip fixed to the inside face of the inner ply of the bag prior to filling is fixed to said inner ply by heat-sealing or high frequency sealing or ultrasound sealing.  
     
     
         5 . A bag according to  claim 4 , wherein the web of the strip that is fixed to the inside face of the inner ply and the polymer coating of the inside face of said inner ply are both made of polyethylene and are suitable for being sealed together by applying heat under pressure.  
     
     
         6 . A bag according to  claim 1 , wherein the closure means comprise a male section and a female section together defining a zip fastener.  
     
     
         7 . A bag according to  claim 6 , wherein the male and female sections project a little above the top edge of the double-ply of the bag, so as to remain visible.  
     
     
         8 . A bag according to  claim 6 , wherein the male and female sections extend over a length that is slightly shorter than the width of the bag.  
     
     
         9 . A bag according to  claim 6 , wherein the male and female sections are suitable for fitting one within the other and for being separated one from the other by actuating a slider.  
     
     
         10 . A bag according to  claim 9 , wherein, prior to first opening, the opening slider is connected to one of the male or female sections by a breakable bridge.  
     
     
         11 . A bag according to  claim 1 , the bag being provided with side bellows.  
     
     
         12 . A bag according to  claim 1 , said bag being closed, the second web of the strip supporting the closure means being fixed to the inside face of the inner ply of the bag.  
     
     
         13 . A bag according to  claim 12 , wherein the two webs of the strip supporting the closure means are sealed together.  
     
     
         14 . A bag according to  claim 12 , wherein the two webs of the strip supporting the closure means are assembled together via a re-usable adhesive.  
     
     
         15 . A bag according to  claim 12 , wherein the two webs of the strip supporting the closure means are assembled together in peel-apart manner.  
     
     
         16 . A bag according to  claim 13 , wherein first separation of the two webs is made visible to the eye by revealing a colored or printed zone that is masked from sight prior to first opening of the bag.  
     
     
         17 . A method of manufacturing a bag as presented in  claim 1 , the method comprising: 
 a step of unreeling stepwise a reel of strips supporting closure means;    followed by a step of cutting a length from said reel that is slightly shorter than the width of the opening of the bag; and    then a step of fixing a single one of the two webs of the cutoff length of strip to the inside face of the inner ply of the bag, said fixing being performed while the bag is held open by spacer means such as clamps.    
     
     
         18 . A method according to  claim 17 , wherein after fixing only one of the two webs of the strip, the spacer means are deactivated and the bag is flattened again for subsequent reopening and filling.  
     
     
         19 . A method according to  claim 17 , wherein the bag is filled after only one of the two webs of the cutoff length of strip has been fixed, the spacer means holding the mouth of the bag in the open position.  
     
     
         20 . A method according to  claim 18 , wherein, once the bag has been filled, the second web of the cutoff length of strip is fixed to the inside face of the inner ply that faces it.  
     
     
         21 . A method according to  claim 20 , wherein the two webs of the cutoff length of strip are assembled to each other by heat-sealing.  
     
     
         22 . A method according to  claim 21 , wherein the two webs are heat-sealed to each other at least partially at the same time as the second web of the cutoff length of the strip is fixed.  
     
     
         23 . A method according to  claim 22 , wherein the two heat-sealing operations are performed hot and under pressure, the strip supporting the closure means, and the coating on the inside face of the inner ply of the bag, both being made of a polymer material such as polyethylene.  
     
     
         24 . A method according to  claim 20 , wherein the operations of heat-sealing the second web and of heat-sealing the two webs together are performed on the line for filling the bags, while the bags are being conveyed after being filled.  
     
     
         25 . A method according to  claim 17 , wherein the strip supporting the closure means and the closure means are formed integrally or are assembled together.  
     
     
         26 . The use of a bag as presented in  claim 1  for packaging foods, for packaging pesticides in granular or powder form, that are dry or have low moisture content.