Method of forming a vented bag

Abstract

A multiwall vented bag is provided which includes an inner tube formed of a plastic material. The inner tube has an open end initially in an open position and adapted to receive filling material therein and at least one vent opening formed therein. The bag further includes a strip of material positioned adjacent and attached to a preselected region of the inner tube. The preselected region includes the at least one vent opening of the inner tube. The strip also includes at least one vent opening to allow air to pass from within the inner tube, through both the at least one vent opening of the inner tube and the at least one vent opening of the strip. The bag further includes an outer tube positioned to substantially surround outer surfaces of the inner tube. The outer tube is formed of a porous material that allows air released from within the inner tube to pass out of the bag through porous material of the outer tube. A method of forming and using a vented bag are also included.

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       26 . A method of forming a vented bag the method comprising: 
 perforating a tube of at least one ply of plastic material to form a plurality of spaced apart vent openings in the tube;    perforating a separate plastic strip of material to form a plurality of spaced apart vent openings in the plastic strip; and    adhering the plastic strip adjacent the tube in a preselected region to thereby form a vented seal zone having a channel space formed between surfaces of the plastic strip and the tube so that the combination of the plurality of vent openings in the tube and the plurality of vent openings in the plastic strip are positioned to not align so as to create a tortuous path to reduce product sifting and insect infestation when product is positioned within the tube and so that air within the tube travels through both of the plurality of vent openings in the tube and the plurality of vent openings in the plastic strip.    
   
   
       27 . A method as defined in  claim 26 , wherein the at least one ply of plastic material of the tube comprises a continuous seamless, tubular, plastic film, wherein the tube comprises an inner tube, and the method further comprises attaching the inner tube to inner surfaces of an outer tube formed of a porous material to substantially surround the inner tube.  
   
   
       28 . A method as defined in  claim 27 , wherein the plastic strip extends substantially the entire longitudinal extent of inner tube, and wherein the outer tube comprises a plurality of layers of porous material so that air exiting the inner tube travels into the porous material of the outer tube and then into atmosphere.  
   
   
       29 . A method as defined in  claim 28 , further comprising heat sealing an end of the tube defining a closed end of the inner tube and heat sealing the channel space adjacent the closed end of the inner tube.  
   
   
       30 . A method as defined in  claim 29 , further comprising heat sealing the open end of the inner tube and an upper end of the channel space positioned adjacent the open end of the inner tube after filler material is filled therein to a selected level to thereby seal the open end of the inner tube and the upper end of the channel space.  
   
   
       31 . A method as defined in  claim 30 , the method further comprising the step of severing the inner tube from the open end of the outer tube to thereby form a sealed plastic pouch within a paper outer bag.  
   
   
       32 . A method as defined in  claim 27 , wherein the tube comprises an inner tube, and the method further comprises forming an outer tube positioned to substantially surround outer surfaces of the inner tube, the outer tube having a closed end region, an open end region being initially in an open position and adapted to receive filling material therethrough, and an outer tube body extending between the open end region and the closed end region and overlying the plastic strip, the outer tube being formed by laminating a plurality of stepped layers of a porous material.  
   
   
       33 . A method as defined in  claim 32 , further comprising forming selective regions of adhesive material between inner surfaces of the closed end region of the outer tube body and outer surfaces of the inner tube so that the closed end of the inner tube is detachably adhered to the closed end region of the outer tube, so that the inner tube remains adhered to the outer tube until after the bag is filled to a selected level with filling material, and so that a user of the bag can readily remove the inner tube from the outer tube without damage to the inner tube when the inner tube has filling material positioned therein, and wherein the porous material comprises paper material.  
   
   
       34 . A method of forming a vented bag, the method comprising: 
 positioning a plate member within a tube of at least one ply of plastic material; and    rotatingly perforating the tube with a perforator roll positioned adjacent a first outer surface of the plate member so that the plate member operates as a stop for the perforator roll to prevent perforation of a second opposing outer surface of the tube and yet allowing perforation of the first outer surface of the tube to form a plurality of spaced apart vent openings in the first outer surface of the tube.    
   
   
       35 . A method as defined in  claim 34 , further comprising perforating a separate plastic strip of material to form a plurality of spaced apart vent openings in the plastic strip and adhering the plastic strip adjacent the tube in a preselected region to thereby form a vented seal zone having a channel space formed between surfaces of the plastic strip and the tube so that the combination of the plurality of vent openings in the tube and the plurality of vent openings in the plastic strip are positioned to not align so as to create a tortuous path to reduce product sifting and insect infestation when product is positioned within the tube and so that air within the tube travels through both of the plurality of vent openings in the tube and the plurality of vent openings in the plastic strip.  
   
   
       36 . A method as defined in  claim 34 , wherein the at least one ply of plastic material of the tube comprises a continuous seamless, tubular, plastic film, wherein the tube comprises an inner tube, and the method further comprises attaching the inner tube to inner surfaces of an outer tube formed of a porous material to substantially surround the inner tube.  
   
   
       37 . A method as defined in  claim 36 , wherein the plastic strip extends substantially the entire longitudinal extent of inner tube, and wherein the outer tube comprises a plurality of layers of porous material so that air exiting the inner tube travels into the porous material of the outer tube.  
   
   
       38 . A method as defined in  claim 34 , wherein the tube of at least one ply of plastic material extends in a substantially horizontal orientation between at least one pair of spaced-apart rollers during travel in a preselected manufacturing direction, wherein the plate member is positioned in the tube between the at least one pair of spaced-apart rollers, and wherein the perforator roll overlies the plate member between the at least one pair of spaced-apart rollers and overlies a substantially horizontal extending first outer surface of the tube to form the plurality of spaced-apart vent openings therein.  
   
   
       39 . A method as defined in  claim 38 , wherein the plate member comprises a metal material and is positioned to be suspended within the tube between the at least one pair of spaced-apart rollers to thereby define a floating plate, and wherein the floating plate travels within the tube between the at least one pair of spaced-apart rollers in a suspended position when the tube is being perforated with the perforator roll during travel between the at least one pair of spaced-apart rollers.  
   
   
       40 . A method as defined in  claim 35 , further comprising heat sealing an end of the tube defining a closed end of the inner tube and heat sealing the channel space adjacent the closed end of the inner tube.  
   
   
       41 . A method as defined in  claim 40 , further comprising heat sealing the open end of the inner tube and an upper end of the channel space positioned adjacent the open end of the inner tube after filler material is filled therein to a selected level to thereby seal the open end of the inner tube and the upper end of the channel space.  
   
   
       42 . A method as defined in  claim 35 , wherein the tube comprises an inner tube, and the method further comprises forming an outer tube positioned to substantially surround outer surfaces of the inner tube, the outer tube having a closed end region, an open end region being initially in an open position and adapted to receive filling material therethrough, and an outer tube body extending between the open end region and the closed end region and overlying the plastic strip, the outer tube being formed by laminating a plurality of stepped layers of a porous material.  
   
   
       43 . A method as defined in  claim 42 , further comprising forming selective regions of adhesive material between inner surfaces of the closed end region of the outer tube body and outer surfaces of the inner tube so that the closed end of the inner tube is detachably adhered to the closed end region of the outer tube, so that the inner tube remains adhered to the outer tube until after the bag is filled to a selected level with filling material, and so that a user of the bag can readily remove the inner tube from the outer tube without damage to the inner tube when the inner tube has filling material positioned therein, and wherein the porous material comprises a paper material.  
   
   
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       48 . A method of forming a vented bag the method comprising: 
 perforating an inner tube of at least one ply of plastic material to form a plurality of spaced apart vent openings in the inner tube;    perforating a separate plastic strip of material to form a plurality of spaced apart vent openings in the plastic strip;    adhering the plastic strip adjacent the tube in a preselected region to thereby form a vented seal zone having a channel space formed between surfaces of the plastic strip and the tube so that the combination of the plurality of vent openings in the tube and the plurality of vent openings in the plastic strip are positioned to not align so as to create a tortuous path to reduce product sifting and insect infestation when product is positioned within the tube and so that air within the tube travels through both of the plurality of vent openings in the tube and the plurality of vent openings in the plastic strip; and    forming an outer tube from a plurality of layers of porous material and to substantially surround outer surfaces of the inner tube, the outer tube having a closed end region, an open end region being initially in an open position and adapted to receive filling material therethrough, and an outer tube body extending between the open end region and the closed end region and overlying the plastic strip.    
   
   
       49 . A method as defined in  claim 48 , further comprising forming selective regions of adhesive material between inner surfaces of the closed end region of the outer tube body and outer surfaces of the inner tube so that the closed end of the inner tube is detachably adhered to the closed end region of the outer tube, so that the inner tube remains adhered to the outer tube until after the bag is filled to a selected level with filling material, and so that a user of the bag can readily remove the inner tube from the outer tube without damage to the inner tube when the inner tube has filling material positioned therein.  
   
   
       50 . A method as defined in  claim 48 , wherein the porous material comprises paper material, and wherein the plurality of layers comprises a plurality of stepped layers of paper material.