Barrier film for packaging material
AssigneeStora Enso OYJ
InventorsIsto Heiskanen, Kaj Backfolk, Katja Lyytikäinen, Jukka Kankkunen
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Abstract
The present invention relates to a barrier film for a paper or paperboard-based packaging material, said barrier film comprising: a substrate; a vacuum coating layer having a thickness in the range of 1-500 nm disposed on the substrate; and a protective coating layer comprising a crosslinked water-soluble polymer disposed on the vacuum coating layer. The present invention further relates to a paper or paperboard based packaging material and containers comprising the barrier film, and to a method for manufacturing the barrier film.
Claims28
A barrier film for a paper or paperboard-based packaging material, said barrier film comprising:
- a substrate;
- a vacuum coating layer having a thickness in a range of 1-500 nm disposed on the substrate;
- and
- a protective coating layer comprising a crosslinked water-soluble polymer disposed on the vacuum coating layer.
A method for manufacturing a barrier film for a paper or paperboard based packaging material, comprising the steps of:
- a) providing a substrate;
- b) applying a vacuum coating layer having a thickness in a range of 1-500 nm on the substrate;
- c) applying a coating solution comprising a water-soluble polymer to the vacuum coating layer;
- and
- d) drying and crosslinking the water-soluble polymer with a crosslinking agent to obtain a protective coating layer comprising a crosslinked water-soluble polymer disposed on the vacuum coating layer.
Dependencies are inferred from the claim text.