Easy open woven polypropylene bag

Abstract

The disclosure relates to a large package, typically with woven polypropylene walls, including an easy-open strip with a pre-activated peel seal. The easy-open strip achieves a high burst strength by configuring the pre-activated peel seal in shear mode in response to internal (product side) forces while achieving a low consumer opening force by configuring the peel seal in response to external (consumer side) forces.

1 . A easy-open strip for a package, including:
 a first flange for connection to a first wall of a package;   a second flange with a first end and a second end, the first end of the second flange being connected to the first flange by a releasable connection, and the second end of the second flange being for connection to a second wall of a package.   
     
     
         2 . The easy-open strip of  claim 1  wherein the first flange has a first end and a second end, and wherein the first end of the first flange and the second end of the first flange are for connection to a first wall of a package. 
     
     
         3 . The easy-open strip of  claim 2  wherein the first and second ends of the first flange are for connection to a first wall of a package by respective first and second hard seals and wherein the second end of the second flange is for connection to a second wall of a package by a third hard seal. 
     
     
         4 . The easy-open strip of  claim 1  wherein the releasable connection is a peel seal. 
     
     
         5 . The easy-open strip of  claim 1  wherein the releasable connection is chosen from the group consisting of a press-to-close profile, a zipper profile with a slider, a hook and loop profile, mushroom fields, all male profiles and all female profiles and are made from material chosen from a group consisting of polyethylene, high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene, cyclic olefin copolymers, ultra low density polyethylene, very low density polyethylene, elastomers, plastomers, metallocene linear low density polyethylene and metallocene polypropylene. 
     
     
         6 . The easy-open strip of  claim 4  wherein the first and second flanges are chosen from a group consisting of polyethylene, high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene, cyclic olefin copolymers, ultra low density polyethylene, very low density polyethylene, elastomers, plastomers, metallocene linear low density polyethylene and metallocene polypropylene. 
     
     
         7 . The easy-open strip of  claim 1  wherein the first and second flanges are for connection to respective first and second walls chosen from a group consisting of polypropylene, woven polypropylene, claf, nylon, polypropylene, polystyrene, and polyethylene. 
     
     
         8 . The easy-open strip of  claim 7  wherein the first, second and third hard seals include a polypropylene/polyethylene plastomer mix. 
     
     
         9 . The easy-open strip of  claim 8  wherein the first, second and third hard seals further include a hot melt amorphous polyolefin. 
     
     
         10 . A package, including:
 a first wall and a second wall joined together at respective edges thereof, thereby forming at least one end;   an easy-open strip for the at least one end, the easy-open strip including;
 a first flange for connected to the first wall; 
 a second flange with a first end and a second end, the first end of the second flange being connected to the first flange by a releasable connection, and the second end of the second flange being connected to the second wall. 
   
     
     
         11 . The package of  claim 10  wherein the first flange has a first end and a second end, and wherein the first end of the first flange and the second end of the first flange are connected to the first wall. 
     
     
         12 . The package of  claim 11  wherein the first and second ends of the first flange are connected to the first wall by respective first and second hard seals and the second end of the second flange is connected to a second wall by a third hard seal. 
     
     
         13 . The package of  claim 10  wherein the releasable connection is a peel seal. 
     
     
         14 . The package of  claim 10  wherein the releasable connection is chosen from the group consisting of a press-to-close profile, a zipper profile with a slider, a hook and loop profile, mushroom fields, all male profiles and all female profiles and are made from material chosen from a group consisting of polyethylene, high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene, cyclic olefin copolymers, ultra low density polyethylene, very low density polyethylene, elastomers, plastomers, metallocene linear low density polyethylene and metallocene polypropylene. 
     
     
         15 . The package of  claim 10  wherein the first wall is joined to the second wall over the easy-open strip by a line of weakness. 
     
     
         16 . The package of  claim 15  wherein the line of weakness is chosen from the group consisting of a perforated line, a slit, and a line formed by laser scoring. 
     
     
         17 . The package of  claim 16  further including grippable tabs proximate to the line of weakness. 
     
     
         18 . The package of  claim 11  wherein the first and second walls are chosen from a group consisting of polypropylene, woven polypropylene, claf, nylon, polypropylene, polystyrene and polyethylene. 
     
     
         19 . The package of  claim 11  wherein the first and second flanges are chosen from a group consisting of polyethylene, high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene, cyclic olefin copolymers, ultra low density polyethylene, very low density polyethylene, elastomers, plastomers, metallocene linear low density polyethylene and metallocene polypropylene. 
     
     
         20 . The package of  claim 12  wherein the first, second and third hard seals include a polypropylene/polyethylene plastomer mix.