US2010293897A1PendingUtilityA1

Heat Activated Adhesives for Bag Closures

42
Individually held — no corporate assignee on recordPriority: May 21, 2009Filed: Jan 12, 2010Published: Nov 25, 2010
Est. expiryMay 21, 2029(~2.8 yrs left)· nominal 20-yr term from priority
Inventors:Mark E. Jansen
B31B 2170/20B31B 70/62B31B 2155/002B31B 2160/20B31B 2155/00B65D 33/22
42
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Claims

Abstract

A polymeric woven bag has a first panel and a second panel and an open end of the bag to be pinched closed. A first layer of heat activated adhesive material is on a portion of the bag to form an adhesive-to-adhesive seal by contact with a second layer of heat activated adhesive material on a portion of the bag. second panel, wherein the first adhesive layer and the second adhesive layer have respective heat activation temperatures below the softening point temperature of the polymeric bag material, and wherein sealing the bag end after the bag has been filled with contents by heat activating the first layer of adhesive material and the second layer of adhesive material at a temperature below the softening point temperature of the polymeric bag material.

Claims

exact text as granted — not AI-modified
1 . A polymeric woven bag, comprising:
 a polymeric outer layer;   an inner polymeric woven bag layer laminated to or adhesively adhered to the outer layer;   a first panel and a second panel and an open end of the bag to be pinched closed between the first panel and the second panel after filling the bag with contents;   a heat activated first adhesive layer on a portion of the first panel to form an adhesive-to adhesive seal by contact with a heat activated second adhesive layer on a portion of the second panel, wherein the first adhesive layer and the second adhesive layer are heat activated to adhesive states at respective heat activation temperatures below the softening point temperature of the polymeric material, and wherein the first adhesive layer and the second adhesive layer are dried and impervious to water and are separate from each other to open the bag end for filling with contents, and wherein the first adhesive layer and the second adhesive layer are heat activatable to adhesive states to form the adhesive-to-adhesive seal by an application of heat at a temperature below the softening point temperature of the polymeric material.   
     
     
         2 . The polymeric woven bag of  claim 1  wherein the heat activated adhesive layers extend across an area of width ranging from ½ inch to 6 inches. 
     
     
         3 . The polymeric woven bag of  claim 1  wherein, the first adhesive layer and the second adhesive layer comprise adhesive materials dried after their application to the portion of the first panel and the portion of the second panel, respectively. 
     
     
         4 . The polymeric woven bag of  claim 1  wherein, each of the adhesive layer and the further adhesive layer comprises an adhesive material soluble in an air dryable solvent. 
     
     
         5 . The polymeric woven bag of  claim 1  wherein, each of the adhesive layer and the further adhesive layer comprises an adhesive material soluble in water and air dried. 
     
     
         6 . The polymeric woven bag of  claim 1  wherein, the adhesive layer and the further adhesive layer are the same material. 
     
     
         7 . The polymeric woven bag of  claim 1  wherein the portion on the second panel comprises a sealing flap portion and the further adhesive layer is on the sealing flap portion. 
     
     
         8 . The polymeric woven bag of  claim 1  wherein the bag is foldable to fold the portion of the first panel on itself, and wherein the sealing flap portion is foldable toward the first panel to hold the bag folded by contact between the adhesive layer and the further adhesive layer. 
     
     
         9 . The polymeric woven bag of  claim 8  wherein, the adhesive layer and the further adhesive layer are on opposite panels of the bag. 
     
     
         10 . The polymeric woven bag of  claim 8  wherein, each of the adhesive layer and the further adhesive layer comprises polymeric adhesive dispersed in water having a melt temperature below 300° F. and below the softening point temperature of the polymeric material of the bag. 
     
     
         11 . The polymeric woven bag of  claim 8  wherein, each of the adhesive layer and the further adhesive layer comprises a first adhesive layer of heat activated adhesive material on a portion of a re-closable and re-sealable bag, and a second adhesive layer of heat activated adhesive material on another portion of the bag, wherein heat activation temperatures of the first adhesive layer and the second adhesive layer are below a softening point temperature of the polymeric material of the bag, and wherein the adhesive layers are separable apart to re-open the bag, and thereafter, to re-close and seal the bag by applying heat at a temperature below a softening point temperature of the polymeric material of the bag to activate an adhesive-to-adhesive seal between the adhesive layers. 
     
     
         12 . The polymeric woven bag of  claim 11  wherein, each of the adhesive layers comprises an adhesive material soluble in an air dryable solvent. 
     
     
         13 . The polymeric woven bag of  claim 11  wherein, each of the adhesive layers comprises a polymeric adhesive dispersed in water having a melt temperature below 300° F. and below the softening point temperature of the polymeric material of the bag. 
     
     
         14 . The polymeric woven bag of  claim 11  wherein, each of the adhesive layers is dried after application to the portion of the first panel, and the second panel, respectively. 
     
     
         15 . A method of making the polymeric woven bag of  claim 1 , comprising:
 a polymeric outer layer;   an inner polymeric woven bag layer laminated to or adhesively adhered to the outer layer;   a first panel and a second panel and an open end of the bag to be pinched closed between the first panel and the second panel after filling the bag with contents;   applying a heat activated first adhesive layer on a portion of the first panel of the bag to be pinched closed between the first panel and the second panel after filling the bag with contents;   applying a heat activated second adhesive layer on a portion of the second panel, wherein the first adhesive layer and the second adhesive layer have respective heat activation temperatures below the softening point temperature of the polymeric material;   drying the first adhesive layer and the second adhesive layer separate from each other;   applying heat at a temperature below the softening point temperature of the polymeric material to activate the first adhesive layer and the second adhesive layer to adhesive states after the bag has been filled with contents; and   folding the bag to form an adhesive-to adhesive seal by contact between the heat activated first adhesive layer and the heat activated second adhesive layer on a folded bag.   
     
     
         16 . The method of  claim 15 , comprising:
 folding the bag to fold the first panel on itself to urge the second adhesive layer into contact with the first adhesive layer on the first panel of the bag and form the adhesive-to-adhesive seal.   
     
     
         17 . The method of  claim 15 , comprising:
 folding a flap portion of the second panel over the first panel to urge the second adhesive layer into contact with the first adhesive layer on the first panel of the bag and form the adhesive-to-adhesive seal.   
     
     
         18 . The method of  claim 15 , comprising:
 applying the heat activated second adhesive layer on the portion of the second panel, wherein the portion of the second panel comprises a sealing flap portion of the bag; and   folding the sealing flap portion of the bag to form the adhesive-to adhesive seal.   
     
     
         19 . The method of  claim 15 , comprising:
 applying the heat while the first adhesive layer and the second adhesive layer are not in contact with each other.   
     
     
         20 . The method of  claim 15 , comprising:
 applying the heat while the first adhesive layer and the second adhesive layer are in contact with each other.   
     
     
         21 . The method of  claim 15 , comprising:
 applying the heat by passing the bag through a pinch sealing unit that lows hot air onto the first adhesive layer and the second adhesive layer at a temperature below the softening point temperature of the polymeric material to activate the first adhesive layer and the second adhesive layer to adhesive states.   
     
     
         22 . The method of  claim 15 , comprising:
 applying the first adhesive layer and the second adhesive layer simultaneously, wherein the adhesive layer and the further adhesive layer are the same material.   
     
     
         23 . The method of  claim 15 , comprising: extending the heat activated adhesive layers across an area of width ranging from ½ inch to 6 inches. 
     
     
         24 . A method of making a bag comprising:
 forming a pinch closed bag end between a first panel and a second panel;   applying a heat activated first adhesive layer on a portion of the first panel;   applying a heat activated second adhesive layer on a portion of the second panel, wherein heat activation temperatures of the first adhesive layer and the second adhesive layer are below the softening point temperature of the polymeric material; and   
       activating the first adhesive layer and the second adhesive layer after filling the bag with contents by applying heat at a temperature below the softening point temperature of the polymeric material; and
 pinch closing the end of the bag to urge the adhesive layers into contact and to form an adhesive-to-adhesive seal.

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