Packaging board, its use and products made thereof
AssigneeStora Enso OYJ
InventorsJari Räsänen, Isto Heiskanen, Risto Laitinen
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Abstract
The invention relates to a packaging board comprising a fibrous base and one or more polymer coating layers on one or both sides of the fibrous base. According to the invention the fibrous base contains the combination of an alkyl ketene dimer size, stearic acid anhydride, a wet-strength size and an aluminium compound, which give the board resistance to aggressive liquids as well as thermal treatment, particularly an improved resistance to raw edge penetration in such circumstances. The invention further relates to containers and packages made of the board, for instance disposable drinking cups, dairy product cartons and auto-clave packages, as well as use of the board for such purposes.
Claims11
A board drinking cup made with packaging board, said packaging board comprising a fibrous base and one or more polymer coating layers on one or both sides of the fibrous base, said cup being configured such that at least the inside of the cup is polymer-coated, wherein said fibrous base contains the combination of
- stearic acid anhydride (SA), present in an amount of less than 0.9 kg/t,
- an alkyl ketene dimer (AKD) size, present in an amount greater than the amount of SA which is present in the fibrous base,
- polyamido amine epichlorohydrin resin (PAAE) as a wet-strength size, and
- alum, said board having resistance to strong alcohol.
Dependencies are inferred from the claim text.