Multilayer film for label and a method for providing such
AssigneeUpm Raflatac Oy
InventorsNoel Mitchell, Matti Manner
Life of this patent
Estimating the term…
Abstract
The invention relates to providing a method for obtaining a multilayer film for thermally inducible shrink labels, products thereof and use of such products. The invention provides a multilayer film for labelling, the multilayer film comprising a first skin layer, a second skin layer and a core layer between the first skin layer and the second skin layer, wherein at least one of the first skin layer and the second skin layer comprises cyclic olefin copolymer and the core layer comprises copolymer of ethylene and butyl acrylate or propylene terpolymer.
Claims20
A shrinkable multilayer film for labeling comprising a first skin layer, a second skin layer and a core layer between the first skin layer and the second skin layer, wherein the first skin layer and the second skin layer each comprise cyclic olefin copolymer and linear low density polyethylene, and the core layer comprises copolymer of ethylene and butyl acrylate, and wherein at least one of the first skin layer and the second skin layer comprises cyclic olefin copolymer in an amount of 90% by weight or more, wherein at least one of the first skin layer and the second skin layer further comprises a plasticizer;
- wherein the multilayer film is configured to shrink in a direction of orientation of the multilayer film by at least 35% at a temperature of 65 to 85° C., and wherein the multilayer film is configured to shrink less than 10% at a temperature below 65° C.
A method for obtaining a shrinkable multilayer film for thermally inducible shrink labels, the method comprising:
- providing a first skin layer and a second skin layer, wherein the first skin layer and the second skin layer each comprise cyclic olefin copolymer and linear low density polyethylene, wherein at least one of the first skin layer and the second skin layer comprises cyclic olefin copolymer in an amount of 90% by weight or more, wherein at least one of the first skin layer and the second skin layer further comprises a plasticizer;
- wherein the multilayer film is configured to shrink in a direction of orientation of the multilayer film by at least 35% at a temperature of 65 to 85° C., and wherein the multilayer film is configured to shrink less than 10% at a temperature below 65° C.;
- providing a core layer between the first and the second skin layer, wherein the core layer comprises copolymer of ethylene and butyl acrylate, wherein the copolymer of ethylene and butyl acrylate is a block or random copolymer, comprising a n-butyl acrylate content in the range of 5% to 15% by weight,
- stretching the multilayer film in the range of 4 to 7 times in a first direction for obtaining monoaxially stretched multilayer film having a tension in the first direction, and
- cooling the multilayer film to room temperature;
- wherein the multilayer film is configured to shrink in a direction of orientation of the multilayer film at least 35% at a temperature range between 65 and 85° C.;
- and wherein the multilayer film is configured to shrink less than 10% at a temperature below 65° C.
Dependencies are inferred from the claim text.