Paperboard comprising recycled fibres
AssigneeBillerud Aktiebolag (publ)
InventorsMats Haggquist, Fredrik Nordstrom
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Abstract
There is provided a method of producing a paperboard comprising a top layer, a back layer and a middle layer, said method comprising the steps of: —forming a middle layer furnish comprising an OCC pulp, a CTMP and broke pulp; and—forming said middle layer from said middle layer furnish, wherein, in the middle layer furnish, the amount of OCC pulp is higher than the amount of CTMP, which is higher than the amount of broke pulp as per dry weight and wherein the combined amount of OCC pulp, CTMP and broke pulp constitutes at least 88% as per dry weight of the middle layer furnish.
Claims17
A method of producing a paperboard comprising a top layer, a back layer and a middle layer, said method comprising the steps of:
- forming a middle layer furnish comprising an OCC pulp, a chemithermomechanical pulp (CTMP) and broke pulp;
- and
- forming said middle layer from said middle layer furnish,
- wherein, in the middle layer furnish, the amount of OCC pulp is higher than the amount of CTMP, which is higher than the amount of broke pulp as per dry weight and
- wherein the combined amount of OCC pulp, CTMP and broke pulp constitutes at least 88% as per dry weight of the middle layer furnish and
- wherein the OCC pulp constitutes more than 35% by dry weight of the middle layer furnish, the CTMP constitutes at least 25% by dry weight of the middle layer furnish and the broke pulp constitutes at least 13% by dry weight of the middle layer furnish.
A paperboard comprising a top layer, a back layer and a middle layer,
- wherein the middle layer comprises an OCC pulp, a chemithermomechanical pulp (CTMP) and broke pulp and
- wherein, in the middle layer, the amount of OCC pulp is higher than the amount of CTMP, which is higher than the amount of broke pulp as per dry weight and
- wherein the combined amounts of OCC pulp, CTMP and broke pulp constitutes at least 88% as per dry weight of the middle layer, and
- wherein the OCC pulp constitutes more than 35% by dry weight of the middle layer, the CTMP constitutes at least 25% by dry weight of the middle layer and the broke pulp constitutes at least 13% by dry weight of the middle layer.
Dependencies are inferred from the claim text.