초록 ▼

Adjoining strata of pressure-sensitive adhesive are transferred to a package substrate. The two outermost adhesive strata have different adhesion to the substrate. The adhesive strata are used as a reclosable fastener and are intermixed in the course of reclosing and reopening the package, the actio

Adjoining strata of pressure-sensitive adhesive are transferred to a package substrate. The two outermost adhesive strata have different adhesion to the substrate. The adhesive strata are used as a reclosable fastener and are intermixed in the course of reclosing and reopening the package, the action being such as to advantageously compensate for contamination occurring at the reseal interface while maintaining the status quo at the permanent interface.

대표청구항 ▼

1. A packaging method which provides for end use resealing of a package made of a substrate material comprising the steps of positioning on a release liner adjoining strata of pressure-sensitive adhesive, a first outermost of said strata having a relatively high adhesion to said substrate material a

1. A packaging method which provides for end use resealing of a package made of a substrate material comprising the steps of positioning on a release liner adjoining strata of pressure-sensitive adhesive, a first outermost of said strata having a relatively high adhesion to said substrate material and a second outermost of said strata having a relatively low adhesion to said substrate material, transferring said adjoining strata of adhesive onto a first portion of said substrate material of said package with said first outermost stratum permanently contacting said substrate to establish a permanent fastener joint at the interface between said first portion of said substrate material and the permanently adhered surface of said first outermost stratum, closing or reclosing said package to initially establish a reseal joint at an interface between some other portion of said substrate material of said package and the reseal surface of said second outermost stratum, gradually and progressively mixing said strata by reopening and reclosing said package at the point of end use to induce relative and intermixing flow between said strata and (1) drive some of the adhesive of another stratum or strata toward said reseal surface of said second outermost stratum to compensate for the adverse effect of contamination on reseal adhesion at said surface and (2) combine the strata to a relatively deep thickness of mixing to increase the adsorption of contaminants, said relative and intermixing flow stopping short of the boundary layer at the permanently adhered surface of said first outermost stratum whereby initial adhesive strength is maintained at the permanent fastener joint. 2. The method of claim 1, in which said reseal joint is initially established by reclosing of said container at the point of end use. 3. The method of claim 1, in which said reseal joint is initially established at the point of initial closing of said container. 4. The method of claim 1, said first outermost stratum having an adhesion value of at least about 0.5 pound per lineal inch of width in respect to said substrate, said second outermost stratum having an initial adhesion value of from about 0.1 pound to about 2.0 pounds per inch of lineal width in respect of said substrate, the ratio of said adhesion value of the first adhesive to said adhesive value of the second adhesive exceeding 1.2. 5. The method of claim 1, said first outermost stratum comprising a layer of a first pressure-sensitive adhesive having a relatively high adhesion to said substrate material, said second outermost stratum comprising an adjacent layer of a second pressure-sensitive adhesive having a relatively low adhesion to said substrate material. 6. The method of claim 5, said first adhesive having an adhesion value of at least about 0.5 pound per lineal inch of width in respect to said substrate, said second adhesive having an initial adhesion value of from about 0.1 pound to about 2.0 pounds per inch of lineal width in respect to said substrate, the ratio of said adhesion value of the first adhesive to said adhesive value of the second adhesive exceeding 1.2. 7. The method of claim 6, said adhesive layers each having an initial caliper of from about 18 to 25 micrometers, with a combined caliper of from about 35 to 50. 8. The method of claim 1, said positioning step including the positioning of said adjoining strata between a first release liner on the outer side of said first outermost stratum and a second release liner on the outer side of said second outermost stratum, said method including the steps of progressively die-cutting through said second release liner and said two strata but not said first release liner to serially form separate labels carried on said first release liner and to form a matrix of waste material lying outside the die cuts and stripping the matrix of waste material from around said formed labels and away from said release liner, said transferring step of said method consisting of stripping a label, as one of said series of formed labels, from said first release liner and applying it to said package, said package being one of a series of packages being labelled, said stripping and applying being performed by conventional pressure-sensitive label application equipment. 9. The method of claim 8, said method including the step of imprinting said second release liner prior to completion of said transferring step to thereby provide a removable coupon, proof of purchase seal, set of instructions, or other removable decoration or indicia. 10. The method of claim 5, said positioning step including the positioning of said two adhesives between a first release liner on the outer side of said first adhesive and a second release liner on the outer side of said second adhesive, said method including the steps of progressively die-cutting through said second release liner and said two adhesive layers but not said first release liner to serially form separate labels carried on said first release liner and to form a matrix of waste material lying outside the die cuts and stripping the matrix of waste material from around said formed labels and away from said release liner, said transferring step of said method consisting of stripping a label, as one of said series of formed labels, from said first release liner and applying it to said package, said package being one of a series of packages being labelled, said stripping and applying being performed by conventional pressure-sensitive label application equipment. 11. The method of claim 10, said method including the step of imprinting said second release liner prior to completion of said transferring step to thereby provide a removable coupon, proof of purchase seal, set of instructions, or other removable decoration or indicia. 12. A packaging method which provides for end use resealing of a package made of a substrate material comprising the steps of positioning next to each other on a release liner adjacent layers of a first pressure-sensitive adhesive having a relatively high adhesion to said substrate material and a second pressure-sensitive adhesive having a relatively low adhesion to said substrate material, transferring said adjacent adhesive layers onto a first portion of said substrate material of said package with said first adhesive permanently contacting said substrate to establish a permanent fastener joint at the interface between said first portion of said substrate material and the permanently adhered surface of said first adhesive, closing or reclosing said package to initially establish a reseal joint at an interface between some other portion of said substrate material of said package and the reseal surface of said second adhesive, gradually and progressively mixing said adhesives by reopening and reclosing said package at the point of end use to induce relative and intermixing flow between said adhesives and (1) drive some of said first adhesive toward said reseal surface to compensate for the adverse effect of contamination on reseal adhesion at said surface and (2) combine the two adhesives to a relatively deep thickness of mixing to increase the adsorption of contaminants, said relative and intermixing flow stopping short of the boundary layer at the permanently adhered surface of said first adhesive whereby initial adhesive strength is maintained at the permanent fastener joint. 13. Adhesive fastener stock to be die-cut into resealable adhesive fasteners for packaging and to be adhered to a package substrate material of polymeric film, polymer-coated paper, paper-bonded polymer or paper, said fastener stock comprising a web construction made up of adjoining strata of pressure-sensitive adhesive, a first outermost of said strata having an adhesion value of at least about 0.5 pound per lineal inch of width in respect to said substrate, a second outermost of said strata having an initial adhesion value of from about 0.1 pound to about 2.0 pounds per inch of lineal width in respect to said substrate, the ratio of said adhesion value of the first outermost stratum to the second outermost stratum exceeding 1.2. 14. Adhesive fastener stock to be die-cut into resealable adhesive fasteners for packaging and to be adhered to a package substrate material of polymeric film, polymer-coated paper, paper-bonded polymer or paper, said fastener stock comprising a web construction made up of a layer of a first pressure-sensitive adhesive, an immediately adjacent layer of a second pressure-sensitive adhesive and at least one release liner on the outer side of one of said pair of adhesives, the caliper of each said layer being from about 18 to 25 micrometers, said first adhesive having an adhesion value of at least about 0.5 pounds per lineal inch of width in respect to said substrate, said second adhesive having an initial adhesion value of from about 0.1 pound to about 2.0 pounds per inch of lineal width in respect of said substrate, the ratio of said adhesion value of the first adhesive to said adhesive value of the second adhesive exceeding 1.2.