Reinforced packaging webs and method
View Patent ↗The specification discloses a method for affixing a strip to an underlying web substrate. According to the method, a substrate web having at least one surface is provided and at least one strip is applied over at least a portion of the substrate surface such that at least a significant portion of an underside surface of the strip disposed adjacent the substrate surface is unbounded to the substrate. A polymer coating is extruded over both the substrate surface and the strip. The strip is thereby affixed to the substrate surface by the coating while the portion of the underside surface of the strip remains substantially unbounded to the substrate surface. At the same time, a substantial portion of an upper surface of the strip adjacent the polymer coating layer is bonded to the coating layer. Also disclosed are packaging materials formed from the reinforced substrate.
1. A method for affixing a strip to an underlying substrate web, comprising:
providing a substrate web having at least one surface;
applying at least one strip over a portion of the substrate web surface such that at least a significant portion of an underside surface of the strip disposed adjacent the substrate surface is substantially unbonded to the substrate web; and
applying as an extrusion a polymer coating layer over and onto both the substrate and the strip such that the strip is affixed to the substrate surface by the coating layer and said portion of the underside surface of the strip remains substantially unbonded to the substrate surface while a substantial portion of an upper surface of the strip adjacent the polymer coating layer is bonded to the coating layer.
2. The method of claim 1 wherein a plurality of strips are applied to the substrate surface and affixed thereto by the polymer coating layer extruded thereon.
3. The method of claim 1 wherein the substrate web comprises a material selected from the group consisting of at least one of a paper web, an oriented polymer film, a metal foil, and a nonwoven fabric.
4. The method of claim 1 wherein the strip material comprises a material selected from the group consisting of at least one of a paper web, an oriented polymer film, a metal foil, and a nonwoven fabric.
5. The method of claim 1 wherein the extruded polymer coating comprises a polymer selected from the group consisting of at least one of low density polyethylene (LDPE), polyolefin plastomers (POP), polyolefin elastomers (POE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE), polypropylene (PP), ethylene methyl acrylate copolymer (EMA), ethylene butyl acrylate copolymer (EnBA), ethylene vinyl acetate copolymer (EVA), ethylene acrylic acid copolymer (EAA), ethylene methyl acrylic acid copolymer (EMAA), ionomoers, ethylene vinyl alcohol (EVOH), polyesters such as polyethylene terephthalate (PET), polyamides (PA).
6. The method of claim 1 wherein the polymer coating comprises a coextrusion of at least two layers of polymer films.
7. The method of claim 1 wherein the extruded polymer coating comprises a polymer selected from the group consisting of at least one of low density polyethylene (LDPE), polyolefin plastomers (POP), polyolefin elastomers (POE), linear low density polyethylene (LLDPE), and high density polyethylene (HDPE).
8. The method of claim 1 , wherein the strip is held in place between the coating and the substrate only by the polymer coating extruded by the substrate and the strip.
9. The method of claim 1 , wherein the strip is held in place in an enclosed pocket formed by the presence of the strip between the extruded coating and the substrate surface.
10. The method of claim 1 , further comprising at least temporarily adhering at least a portion of the underside surface of the strip to the surface of the substrate to facilitate retention of the strip on the substrate surface for extrusion of the polymer coating over the strip and substrate.
11. The method of claim 1 , wherein the strip is applied to the substrate surface in advance of extruding the polymer coating layer over the strip and the substrate.
12. The method of claim 1 , wherein the strip is applied over the portion of the substrate surface by at least temporarily adhering the strip to the polymer coating prior the extruding coating making contact with the substrate.
13. The method of claim 1 , wherein the strip is applied as an elongate web strip having a width substantially less than the width of the substrate web.
14. The method of claim 1 , wherein the step of applying the strip comprises applying a plurality of elongate strips in side-by-side, spaced apart relation across at least a portion of the width of the web.
15. A method for making a reinforced packaging material comprising:
providing an elongate substrate web having at least one surface;
providing at least one reinforcement strip adjacent to the surface of the substrate web; and
applying as an extrusion a polymer coating layer over and onto both the substrate surface with the reinforcement strip sandwiched therebetween in order to cause the strip to be bonded to the coating and to be affixed to the substrate web surface by the coating without any substantial direct bonding between the substrate and an underside surface of the strip adjacent to the surface of the substrate web.
16. The method of claim 15 wherein a plurality of strips are provided adjacent the substrate surface and are affixed thereto by the polymer coating.
17. The method of claim 16 , wherein the plurality of strips include a plurality of elongate strips arranged generally linearly, one after the other, along the length of the substrate in spaced-apart relation.
18. The method of claim 15 , wherein the strip is sandwiched between the coating and the substrate surface by first applying the strip to the substrate surface before the coating is extruded over the substrate surface.
19. The method of claim 15 , wherein the strip is an elongate web having a width less than the width of the coating and the substrate so that side edges of the coating extend over and beyond side edges of the strip and are adhered to the substrate surface along interfacial areas between surfaces of the substrate and surfaces of the coating.
20. The method of claim 15 wherein the substrate web comprises a material selected from the group consisting of at least one of a paper web, an oriented polymer film, a metal foil and a nonwoven fabric.
21. The method of claim 15 wherein the strip comprises a material selected from the group consisting of at least one of a paper web, an oriented polymer film, a metal foil and a nonwoven fabric.
22. The method of claim 15 wherein the polymeric coating comprises a polymer selected from the group consisting of at least one of low density polyethylene (LDPE), polyolefin plastomers (POP), polyolefin elastomers (POE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE), polypropylene (PP), ethylene methyl acrylate copolymer (EMA), ethylene butyl acrylate copolymer (EnBA), ethylene vinyl acetate copolymer (EVA), ethylene acrylic acid copolymer (EAA), ethylene methyl acrylic acid copolymer (EMAA), ionomoers, ethylene vinyl alcohol (EVOH), and polyesters such as polyethylene terephthalate (PET) and polyamides (PA).
23. The method of claim 15 wherein the polymer coating comprises a polymer selected from the group consisting of at least one of low density polyethylene (LDPE), polyolefin plastomers (POP), polyolefin elastomers (POE), linear low density polyethylene (LLDPE), and high density polyethylene (HDPE).
24. The method of claim 15 wherein the polymer coating comprises a coextrusion of at least two layers of polymer films.
25. The method of claim 15 further comprising forming the packaging material into ream wrap.
26. The method of claim 15 further comprising forming the packaging material into insulation facing.
27. The method of claim 15 further comprising forming the packaging material into a sandwich wrapper.
28. The method of claim 15 further comprising forming the packaging material into a coffee brick wrapper.
29. The method of claim 15 , further comprising temporarily adhering at least one reinforcement strip to the substrate web prior to the extrusion coating and removing the temporary adhesion between strip and the substrate after the extrusion coating.
30. A method for affixing a strip to an underlying substrate web comprising:
providing a substrate web;
applying at least one strip over a portion of the substrate web surface and temporarily adhering an underside surface of the strip thereto;
applying as an extrusion a polymer coating layer over and onto both the substrate and the strip such that the strip is affixed to the substrate surface by the coating layer and an upper surface of the strip adjacent the polymer coating layer is bonded to the coating layer; and
removing the temporary adhesion between the strip underside and the substrate so that the strip underside is unbonded to the substrate surface.
31. The method of claim 30 wherein a plurality of strips are applied to the substrate surface and affixed thereto by the polymer coating layer extruded thereon.
32. The method of claim 30 wherein the substrate web selected from the group consisting of at least one of a paper web, a metal foil, an oriented polymer film, and a nonwoven fabric.
33. The method of claim 30 wherein the strip material comprises a material selected from the group consisting of at least one of a paper web, an oriented polymer film, a metal foil, and a nonwoven fabric.
34. The method of claim 30 wherein the extruded polymer coating comprises a polymer selected from the group consisting of at least one of low density polyethylene (LDPE), polyolefin plastomers (POP), polyolefin elastomers (POE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE), polypropylene (PP), ethylene methyl acrylate copolymer (EMA), ethylene butyl acrylate copolymer (EnBA), ethylene vinyl acetate copolymer (EVA), ethylene acrylic acid copolymer (BAA), ethylene methyl acrylic acid copolymer (EMAA), ionomoers, ethylene vinyl alcohol (EVOH), and polyesters such as polyethylene terephthalate (PET) and polyamides (PA).
35. The method of claim 30 wherein the extruded polymer coating comprises a polymer selected from the group consisting of at least one of low density polyethylene (LDPE), polyolefin plastomers (POP), polyolefin elastomers (POE), linear low density polyethylene (LLDPE) high density polyethylene (HDPE).
36. The method of claim 30 wherein the polymer coating comprises a coextrusion of at least two layers of polymer films.