CA2612334A1 - Grease-resistant pinch-bottom bag having adhesive closure, adhesive closure for bag, and related methods - Google Patents

Abstract

An embodiment of a bag includes a bag body having opposing bag ends and an inner face of an outer ply abuttingly adhered to an outer face of an inner ply with an adhesive. The bag can also include the outer ply having an inner face of a grease-resistant film abuttingly adhered to an outer face of a paper layer with an adhesive. The bag can further include the inner ply having a film of one or more layers having a grease-resistant material adapted to advantageously closingly seal at least one of the bag ends. An adhesive advantageously adheres a portion of a bag end to another portion of the same bag end to closingly seal the bag end. Embodiments of other bags, bag closures, and methods of assembly, positioning, using, and constructing a bag are also provided.

Claims (39)

1. A food bag to carry a food element having a grease component so that grease from the grease component is substantially prevented from penetrating from within the bag to outside the bag and also so that grease from other grease components not associated with the food bag is substantially prevented from penetrating from outside the bag to within the bag, the food bag comprising:
a tubular bag body having a pair of opposing open bag ends and an inner face of an outer ply abuttingly adhering to an outer face of an inner ply, the outer ply including an inner face of a grease-resistant polyester film abuttingly adhered to an outer face of a paper layer with a solventless adhesive, the paper layer having a greater thickness and bending stiffness than the polyester film, the inner face of the polyester film having printed indicia thereon to enhance visual appearance of the bag, the polyester film adapted to allow an amount of light to transmit therethrough to thereby allow viewing of the printed indicia from outside of the bag, and the inner ply including an inner face of a first film abuttingly adhered to an outer face of a grease-resistant material and an inner face of the grease-resistant material abuttingly adhered to an outer face of a second film, a portion of the second film overlying a portion of the polyester film to define an overlapping seam of the tubular bag body extending along a longitudinal extent of the bag, the outer ply having a substantially similar longitudinal length from one bag end to the other bag end along a circumferential periphery of each of the opposing bag ends, the inner ply having a substantially similar longitudinal length from the one bag end to the other bag end along a circumferential periphery of each of the opposing bag ends, and a portion of at least one of the inner and outer plies of at least one of the opposing bag ends foldingly and adheringly overlying another portion of the one bag end to define an overlapping seam extending along substantially an entire transverse extent of the one bag end to thereby closingly seal the one bag end so that the food element when positioned therein is retained within inner confines of the bag between the opposing pair of bag ends.

2. A food bag to carry a food element having a grease component so that grease from the grease component is prevented from penetrating from within the bag to outside the bag and also so that grease from other grease components not associated with the food bag is prevented from penetrating from outside the bag to within the bag, the food bag comprising:

a tubular bag body having a pair of opposing open bag ends and an inner face of an outer ply abuttingly adhering to an outer face of an inner ply, the outer ply including an inner face of a grease-resistant polyester film abuttingly adhered to an outer face of a paper layer, the paper layer having a greater thickness and bending stiffness than the polyester film, the inner face of the polyester film having printed indicia thereon to enhance visual appearance of the bag, the polyester film adapted to allow an amount of light to transmit therethrough to thereby allow viewing of the printed indicia from outside of the bag, and the inner ply including a grease-resistant material, a portion of the grease-resistant material overlying a portion of the polyester film to define an overlapping seam of the tubular bag body extending along a longitudinal extent of the bag, the outer ply having a substantially similar longitudinal length from one bag end to the other bag end along a circumferential periphery of each of the opposing bag ends, the inner ply having a substantially similar longitudinal length from one bag end to the other bag end along a circumferential periphery of each of the opposing bag ends, and a portion of at least one of the inner and outer plies of at least one of the opposing bag ends adheringly overlying another portion of the same bag end to define an overlapping seam substantially extending along a transverse extent of at least one of the pair of bag ends to thereby closingly seal the at least one of the pair of bag ends so that the food element when positioned therein is retained within inner confines of the bag between the opposing pair of bag ends.

3. A bag defined by Claim 2, wherein the outer ply includes an inner face of a grease-resistant polyester film abuttingly adhered to an outer face of a paper layer with a solventless adhesive, and wherein the inner ply comprises one or more layers of a polymeric material.

4. A bag defined by Claim 2, wherein the polyester film of the outer ply is selected from the group consisting of: polyethylene terephthalate (PET), polyethylene terephthalate polyester (PETP), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), and wherein the grease-resistant material of the inner ply is selected from the group consisting of:
nylon and polypropylene.

5. A bag defined by Claim 2, wherein the polyester film is treated with a coating on the outer face of the outer ply to provide an enhanced coefficient of friction in a range of about 0.5 to about 0.9, and wherein the paper layer has a greater thickness than the polyester film to thereby enhance bending stiffness and increase stabilization of the bag.

6. A bag defined by Claim 2, wherein the paper layer is clay coated and bleached, and wherein the paper layer is treated with a chemical to provide enhanced protection from grease penetrating through the paper layer of the bag.

7. A bag defined by Claim 6, wherein the paper layer has a thickness in the range of about 3.5 millimeters to about 4.5 millimeters, and wherein the polyester film has a thickness in the range of about 0.475 millimeters to about 0.485 millimeters.

8. A bag defined by Claim 2, wherein an inner face of the inner ply of at least one of the opposing bag ends adheringly overlies an outer face of the outer ply of the same bag end to define an overlapping seam substantially extending along a transverse extent of the bag end.

9. A bag defined by Claim 2, wherein an outer face of the outer ply of at least one of the opposing bag ends adheringly overlies the same outer face of the same outer ply of the same bag end to define an overlapping seam substantially extending along a transverse extent of the bag end.

10. A bag defined by Claim 2, wherein an adhesive including components of rosin ester and ethylene vinyl acetate adheres a portion of at least one of the inner and outer plies of at least one of the opposing bag ends to another portion of the same bag end to define an overlapping seam substantially extending along a transverse extent of at least one of the pair of bag ends.

11. A bag defined by Claim 10, wherein the adhesive further includes a component selected from the group consisting of: styrene-isoprene-styrene copolymers, styrene-butadiene-styrene copolymers, ethylene ethyl acrylate copolymers, polyurethane reactive adhesives, tackifiers, waxes, paraffin, antioxidants, plasticizers, plant sterols, terpene resins, polyterpene resins, turpentines, hydrocarbon resins, resin acids, fatty acids, polymerized rosins, and polyamide adhesives.

12. A bag comprising:
a bag body having a pair of opposing open bag ends and an inner face of an outer ply abuttingly adhering to an outer face of an inner ply, the outer ply including an inner face of a grease-resistant polyester film abuttingly adhered to an outer face of a paper layer, the paper layer having a greater bending stiffness than the polyester film, the inner ply including a grease-resistant material, and an end portion of at least one of the inner and outer plies of at least one of the opposing bag ends adheringly overlying another portion of the same bag end to define an overlapping seam substantially extending along a transverse extent of the same bag end to thereby closingly seal the bag end.

13. A bag defined by Claim 12, wherein the polyester film is abuttingly adhered to the paper layer with a solventless adhesive, wherein the inner face of the polyester film has printed indicia thereon to enhance visual appearance of the bag, and wherein the polyester film allows an amount of light to transmit therethrough to thereby allow viewing of the printed indicia from outside the bag.

14. A bag defined by Claim 12, wherein a portion of the inner ply overlies a portion of the outer ply to define an overlapping seam of the tubular bag body extending along a longitudinal extent of the bag, the outer ply having a substantially similar longitudinal length from one bag end to the other bag end along a circumferential periphery of each of the opposing bag ends, and the inner ply having a substantially similar longitudinal length from one bag end to the other bag end along a circumferential periphery of the opposing bag ends.

15. A bag defined by Claim 12, wherein the polyester film of the outer ply is selected from the group consisting of: polyethylene terephthalate (PET), polyethylene terephthalate polyester (PETP), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), and wherein the grease-resistant material of the inner ply is selected from the group consisting of:
nylon and polypropylene.

16. A bag defined by Claim 12, wherein the polyester film is treated with a coating on the outer face of the outer ply to provide an enhanced coefficient of friction in a range of about 0.5 to about 0.9, and wherein the paper layer has a greater thickness than the polyester film to thereby enhance bending stiffness and increase stabilization of the bag.

17. A bag defined by Claim 12, wherein the paper layer is clay coated and bleached, and wherein the paper layer is treated with a chemical to provide enhanced protection from grease penetrating through the paper layer of the bag.

18. A bag defined by Claim 17, wherein the paper layer has a thickness in the range of about 3.5 millimeters to about 4.5 millimeters, and wherein the polyester film has a thickness in the range of about 0.475 millimeters to about 0.485 millimeters.

19. A bag defined by Claim 12, wherein an inner face of the inner ply of at least one of the opposing bag ends adheringly overlies an outer face of the outer ply of the same bag end to define an overlapping seam substantially extending along a transverse extent of the bag end.

20. A bag defined by Claim 12, wherein an outer face of the outer ply of at least one of the opposing bag ends adheringly overlies the same outer face of the same outer ply of the same bag end to define an overlapping seam substantially extending along a transverse extent of the bag end.

21. A bag defined by Claim 12, wherein an adhesive including components of rosin ester and ethylene vinyl acetate adheres a portion of at least one of the inner and outer plies of at least one of the opposing bag ends to another portion of the same bag end to define an overlapping seam substantially extending along a transverse extent of at least one of the pair of bag ends.

22. A bag defined by Claim 21, wherein the adhesive further includes a component selected from the group consisting of: styrene-isoprene-styrene copolymers, styrene-butadiene-styrene copolymers, ethylene ethyl acrylate copolymers, polyurethane reactive adhesives, tackifiers, waxes, paraffin, antioxidants, plasticizers, plant sterols, terpene resins, polyterpene resins, turpentines, hydrocarbon resins, resin acids, fatty acids, polymerized rosins, and polyamide adhesives.

23. A bag comprising:
a bag body having a pair of opposing open bag ends and an inner face of an outer ply abuttingly adhering to an outer face of an inner ply, the outer ply including a grease-resistant film, the inner ply including a grease-resistant material, and an end portion of at least one of the inner and outer plies of at least one of the opposing bag ends adheringly overlying another portion of the same bag end with an adhesive including components of rosin ester and ethylene vinyl acetate so that the grease resistant film of the outer ply contacts the adhesive and the grease resistant material of the inner ply contacts the adhesive to thereby define an overlapping seam substantially extending along a transverse extent of the same bag end to thereby closingly seal the bag end.

24. A bag defined by Claim 23, wherein the polyester film of the outer ply is selected from the group consisting o1: polyethylene terephthalate (Ft 1), polyethylene terephthalate polyester (PETP), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), and wherein the grease-resistant material of the inner ply is selected from the group consisting of:
nylon and polypropylene.

25. A bag defined by Claim 23, wherein an inner face of the inner ply of at least one of the opposing bag ends adheringly overlies an outer face of the outer ply of the same bag end to define an overlapping seam substantially extending along a transverse extent of the bag end.

26. A bag defined by Claim 23, wherein an outer face of the outer ply of at least one of the opposing bag ends adheringly overlies the same outer face of the same outer ply of the same bag end to define an overlapping seam substantially extending along a transverse extent of the bag end.

27. A bag defined by Claim 23, wherein the adhesive further includes a component selected from the group consisting of: styrene-isoprene-styrene copolymers, styrene-butadiene-styrene copolymers, ethylene ethyl acrylate copolymers, polyurethane reactive adhesives, tackifiers, waxes, paraffin, antioxidants, plasticizers, plant sterols, terpene resins, polyterpene resins, turpentines, hydrocarbon resins, resin acids, fatty acids, polymerized rosins, and polyamide adhesives.

28. A bag comprising:
a bag body having an inner face of an outer ply abuttingly adhering to an outer face of an inner ply, the outer ply including a polyester material, the inner ply including a polymeric material, and a portion of at least one of the inner and outer plies adheringly overlying another portion of the same bag end with an adhesive including components of rosin ester and ethylene vinyl acetate so that the polyester material of the outer ply contacts the adhesive and the polymeric material of the inner ply contacts the adhesive to thereby define a bag closure.

29. A bag defined by Claim 28, wherein the polyester material of the outer ply is selected from the group consisting of: polyethylene terephthalate (PET), polyethylene terephthalate polyester (PETP), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), and wherein the grease-resistant material of the inner ply is selected from the group consisting of: nylon and polypropylene.

30. A bag defined by Claim 28, wherein an inner face of the inner ply of at least one of the opposing bag ends adheringly overlies an outer face of the outer ply of the same bag end to define an overlapping seam substantially extending along a transverse extent of the bag end to thereby closingly seal the bag end.

31. A bag defined by Claim 28, wherein an outer face of the outer ply of at least one of the opposing bag ends adheringly overlies the same outer face of the same outer ply of the same bag end to define an overlapping seam substantially extending along a transverse extent of the bag end to thereby closingly seal the bag end.

32. A bag defined by Claim 28, wherein the adhesive further includes a component selected from the group consisting of: styrene-isoprene-styrene copolymers, styrene-butadiene-styrene copolymers, ethylene ethyl acrylate copolymers, polyurethane reactive adhesives, tackifiers, waxes, paraffin, antioxidants, plasticizers, plant sterols, terpene resins, polyterpene resins, turpentines, hydrocarbon resins, resin acids, fatty acids, polymerized rosins, and polyamide adhesives.

33. A method of constructing a bag, the method comprising:
(a) adhering an inner face of a grease-resistant polyester film with an outer face of a paper layer to create an outer ply;
(b) adhering an inner face of a first film to an outer face of a grease-resistant material and adhering an inner face of the grease-resistant material to an outer face of a second film to create a multi-layer inner ply;
(c) adhering an inner face of the outer ply to an outer face of the inner ply to create a laminate with a pair of opposing ends;
(d) adheringly overlying a portion of an inner face of the inner ply located at one lateral side of the laminate onto a portion of an outer face of the outer ply located at another lateral side of the laminate to define an overlapping seam extending along a longitudinal extent of a tubular portion of the bag; and (e) adheringly overlying an end portion of at least one of the inner and outer plies of at least one of the opposing bag ends onto another portion of the same bag end with an adhesive including components of rosin ester and ethylene vinyl acetate to define an overlapping seam substantially extending along a transverse extent of the same bag end to thereby closingly seal the bag end.

34. A method defined by Claim 33, wherein the grease-resistant film of the outer ply comprises a thermoplastic material selected from the group consisting of:
polyethylene terephthalate (PET), polyethylene terephthalate polyester (PETP), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), wherein the pair of heat-sealable films of the inner ply comprises a material selected from the group consisting of:
polyethylene (PE) and oriented polypropylene (OPP), and wherein the grease-resistant film of the inner ply comprises a material selected from the group consisting of: nylon and polypropylene.

35. A method defined by Claim 33, further comprising before step (d) cutting each of the pair of opposing ends so that the outer ply has a substantially similar longitudinal length from one bag end to the other bag end along a circumferential periphery of each of the pair of opposing bag ends and the inner ply has a substantially similar longitudinal length from one bag end to the other bag end along the circumferential periphery of each of the pair of opposing bag ends.

36. A method defined by Claim 33, further comprising:
(f) adhering an inner face of the inner ply of at least one of the opposing bag ends against an outer face of the outer ply of the same bag end to define an overlapping seam substantially extending along a transverse extent of the bag end; and (g) closingly sealing the overlapping seam responsive to the adhering to thereby prevent grease from penetrating from within the bag to outside the bag and prevent grease from penetrating from outside the bag to within the bag.

37. A method defined by Claim 33, further comprising:
(f) adhering an outer face of the outer ply of at least one of the opposing bag ends against the same outer face of the same outer ply of the same bag end to define an overlapping seam substantially extending along a transverse extent of the bag end; and (g) closingly sealing the overlapping seam responsive to the adhering to thereby prevent grease from penetrating from within the bag to outside the bag and prevent grease from penetrating from outside the bag to within the bag.

38. A bag defined by Claim 33, further comprising applying an adhesive including components of rosin ester and ethylene vinyl acetate to adhere and closingly seal a portion of at least one of the inner and outer plies of at least one of the opposing bag ends to another portion of the same bag end to define an overlapping seam substantially extending along a transverse extent of at least one of the pair of bag ends.

39. A bag defined by Claim 38, wherein the adhesive further includes a component selected from the group consisting of: styrene-isoprene-styrene copolymers, styrene-butadiene-styrene copolymers, ethylene ethyl acrylate copolymers, polyurethane reactive adhesives, tackifiers, waxes, paraffin, antioxidants, plasticizers, plant sterols, terpene resins, polyterpene resins, turpentines, hydrocarbon resins, resin acids, fatty acids, polymerized rosins, and polyamide adhesives.