Multilayer film for label and a method for providing such
AssigneeUpm Raflatac Oy
InventorsNoel Mitchell, Matti Manner
Life of this patent
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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.
Claims16
A 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 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 propylene terpolymer, wherein the core layer comprises copolymer of ethylene and butyl acrylate in the range of 10 to 90% by weight,
- 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 30% by weight, and
- the multilayer film is stretched in a direction of orientation and shrinks in the direction of orientation of the multilayer film at least 25% at a temperature range between 65 and 85° C.
A method for obtaining a multilayer film for thermally inducible shrink labels, the method comprising:
- providing a first skin layer and a second skin layer, wherein at least one of the first skin layer and the second skin layer comprises propylene terpolymer,
- providing a core layer comprising copolymer of ethylene and butyl acrylate in the range of 10 to 90% by weight between the first skin layer and the second skin layer,
- stretching the multilayer film in the range of 4 to 7 times in a first direction for obtaining a monoaxially stretched multilayer film having a tension in the first direction, and
- cooling the multilayer film to room temperature,
- 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 30% by weight, and
- wherein the multilayer film shrinks in the first direction by at least 25% at a temperature range between 65 and 85° C.
Dependencies are inferred from the claim text.