Method of forming a bag
View Patent ↗A bag having a tamper evident closure and methods of forming the same are provided. The bag has a tube body with a front wall and a back wall positioned between a first end and a second end. A back flap extension member connects to and extends outwardly from the second end of the back wall. A primer material is positioned on the back flap extension member and an adhesive material is placed on the back flap extension member that folds over to overlie and contact the primer material. The back flap extension member adheres to the front flap extension member and portions of the front wall to close the second end. When the back flap extension member liftingly separates from the front wall, at least one of the back flap extension member and the front wall tears indicating evidence of tampering.
1. A method of forming a bag having a tamper evident feature associated therewith, the method comprising:
applying a primer material to overlie selected portions of a substrate to form a primed portion of the substrate and to thereby define a first band region between the selected portions of the substrate and the primer material;
forming a tube body with at least the substrate, the tube body having a first end and a second end positioned substantially opposite the first end, the tube body having a front wall positioned between the first end and the second end and a back wall positioned to face opposite the front wall, the primed portion of the substrate selected second end portions of an outer surface of the front wall, the tube body further including a back flap extension member connected to and extending outwardly from the second end of the back wall and a front flap extension member connected to and extending outwardly from the second end of the front wall;
applying an adhesive material to overlie the back flap extension member; and
folding the back flap extension member to overlie and adhere to the front flap extension member and the selected second end portions of the outer surface of the front wall to thereby securely close the second end, the primer material and the adhesive material thereby defining a second bond region, the first bond region being stronger than the second bond region so that when the back flap extension member liftingly separates from at least one of the front wall and the front flap extension member, at least one of the back flap extension member and the selected portions of the outer surface of the front wall tears indicating tampering with the second end of the bag has occurred.
2. A method as defined in claim 1 , further comprising the step of drying the primer material prior to forming the tube body.
3. A method as defined in claim 1 , wherein the step of applying the primer material included printing material on the selected portions of the outer surface of the front wall so that the primer material is applied to substantially all of the selected portions of the outer surface of the front wall.
4. A method as defined in claim 1 , wherein the steps of applying the adhesive material and applying the primer material includes applying the adhesive material comprising a first polyolefin polymer and the primer material comprising a second polyolefin polymer, wherein the second polyolefin polymer has a different chemical polyolefin composition from the first polyolefin polymer.
5. A method as defined in claim 4 , wherein the step of applying the adhesive material and applying the primer material includes applying the first polyolefin polymer comprising a modified polyolefin polymer and applying the second polyolefin polymer comprising a vinyl acetate polymer.
6. A method as defined in claim 1 , wherein the step of forming a tube body includes forming a plurality of auxiliary apertures in the selected portions of the outer surface of the front wall prior to applying the adhesive material.
7. A method as defined in claim 6 , wherein the step of forming a plurality of auxiliary apertures includes spacing the plurality of auxiliary apertures apart across a width of the front wall, the plurality of auxiliary apertures comprising a plurality of elongate slits.
8. A method as defined in claim 1 , wherein the step of forming a tube body includes forming the tube body comprising a plurality of layers selected from at least one of the following: a paper material, a metal foil material, and a plastic material.
9. A method as defined in claim 8 , wherein the step of forming a tube body includes forming a tube body with a material capable of being torn so that an outer layer of the front wall tears due to the material being weaker than the first bond region.
10. A method as defined in claim 1 , wherein the step of forming the tube body further includes forming the tube body with a plurality of layers wherein at least one of the plurality of layers having a peripheral end portion extends past other peripheral end portions of other layers, wherein the back flap extension member is connected to at least one of the plurality of layers having a peripheral end portion that extends past the other peripheral end portions of the other layers, and is formed of the same material as at least one of the plurality of layers.
11. A method as defined in claim 10 , wherein at least one of the plurality of layers comprises an innermost layer of the plurality of layers and the step of forming a tube body includes forming the tube body with the back flap extension member having a longer longitudinal extent than the front flap extension member.
12. A method as defined in claim 1 , wherein the step of applying the adhesive material includes positioning the adhesive material on the back flap extension member with a preselected spray pattern selected from at least one of the following: spiral spray, flood coat, swirl spray, atomized spray, and slot coating.
13. A method as defined in claim 1 , further including the step of positioning a pre-applied primer material positioned on an outer surface of selected first end portions of the back wall and a pre-applied adhesive material positioned on to overlie a first end front flap extension member, the first end front flap extension member being adapted to fold over, overlie, and adhere to the outer surface of selected first end portions of the back wall, thereby allowing users to melt the pre-applied primer material and pre-applied adhesive material once the bag has been filled and the first end front flap extension member has been folded over the outer surface of selected first end portions of the back wall to enable users to securely seal the first end of the tube body.
14. A method of forming a bag having a tamper evident feature associated therewith and contents therein, the method comprising:
applying a primer material to overlie selected portions of a substrate to form a first end primed portion of the substrate and to thereby define a first end first bond region and to form a second end primed portion of the substrate and to thereby define a second end first bond region between the selected portions of the substrate and the primer material;
forming a tube body with at least the substrate, the tube body having a first end and a second end positioned substantially opposite the first end, the tube body having a front wall positioned between the first end and the second end and a back wall positioned to face opposite the front wall, the first end primed portion of the substrate forming selected first end portions of an outer surface of the front wall, the second end primed portion of the substrate forming selected second end portions of an outer surface of the back wall, the tube body further including a first end back flap extension member connected to and extending outwardly from the first end of the back wall and a second end front flap extension member connected to and extending outwardly from the second end of the front wall;
applying an adhesive material to overlie the first end back flap extension member and the second end front flap extension member; and
folding the second end front flap extension member to overlie and adhere to the selected second end portions of the outer surface of the back wall to thereby securely close the second end, the primer material and the adhesive material thereby defining a first end second bond region and a second end second bond region, the second end first bond region being stronger than the second end second bond region so that when the second end front flap extension member liftingly separates from the front wall, at least one of the second end portion of the outer surface of the back wall and the second end front flap extension member tears to thereby define a second tear region and so that the second tear region indicates that tampering with the second end of the bag has occurred; filling the bag with an end user product; and
folding the first end back flap extension member to overlie and adhere to the selected first end portions of the outer surface of the front wall to thereby securely close the first end, the first end first bond region being stronger than the first end second bond region so that when the first end back flap extension member liftingly separates from the selected first end portions of the outer surface of the front wall, at least one of the first end back flap extension member and the selected first end portion of the outer surface of the front wall tears to thereby define a first tear region and so that the first tear region indicates that tampering with the first end of the bag has occurred.
15. A method as defined in claim 14 , wherein the step of forming a tube body includes forming the tube body comprising a plurality of layers selected from at least one of the following: a paper material, a metal foil material, and a plastic material.
16. A method as defined in claim 14 , further including the step of drying the primer material prior to forming the tube body.