New substrate
AssigneeBillerud Aktiebolag (publ)
InventorsOlivia Markbo, Mats Alden, Ulf Nyman, Fredrik Nordstrom
Life of this patent
Estimating the term…
Abstract
There is provided a high-density paper having a grammage measured according to ISO 536:2012 of 30-75 g/m2 and a density measured according to ISO 534:2011 above 1000 kg/m3 and wherein the high-density paper is impregnated on each side with 0.3-4.0 g/m2, such as 0.5-3.0 g/m2, of a polymer selected from the group consisting of polyvinyl alcohol (PVOH), ethylene vinyl alcohol (EVOH), carboxymethylated cellulose (CMC), nanocrystalline cellulose (NCC) and carboxy methyl starch (CMS).
Claims17
A high-density paper having a grammage measured according to ISO 536:2012 of 30-75 g/m2 and a density measured according to ISO 534:2011 above 1000 kg/m3 and
- wherein the high-density paper is impregnated on each side with 0.3-4.0 g/m2 of a polymer selected from the group consisting of polyvinyl alcohol (PVOH), ethylene vinyl alcohol (EVOH), carboxymethylated cellulose (CMC), nanocrystalline cellulose (NCC) and carboxy methyl starch (CMS).
A method of forming a high-density paper having a grammage measured according to ISO 536:2012 of 30-75 g/m2, said method comprising the steps of:
- impregnating each side of a paper substrate with 0.3-4.0 g/m2 of a polymer selected from the group consisting of polyvinyl alcohol (PVOH), ethylene vinyl alcohol (EVOH), carboxymethylated cellulose (CMC), nanocrystalline cellulose (NCC) and carboxy methyl starch (CMS) to obtain an impregnated substrate;
- and
- supercalendering the impregnated substrate to obtain the high-density paper.
(canceled)
Dependencies are inferred from the claim text.