Search International and National Patent Collections

1. (WO2018054957) A PAPER OR PAPERBOARD PRODUCT COMPRISING AT LEAST ONE PLY CONTAINING HIGH YIELD PULP AND ITS PRODUCTION METHOD

Pub. No.:    WO/2018/054957    International Application No.:    PCT/EP2017/073745
Publication Date: Fri Mar 30 01:59:59 CEST 2018 International Filing Date: Thu Sep 21 01:59:59 CEST 2017
IPC: D21H 11/02
D21F 3/00
D21F 5/00
D21F 5/02
D21H 11/08
D21H 11/10
Applicants: HÖGLUND, Hans
PETTERSSON, Gunilla
NORGREN, Sven
ENGSTRAND, Per
Inventors: HÖGLUND, Hans
PETTERSSON, Gunilla
NORGREN, Sven
ENGSTRAND, Per
Title: A PAPER OR PAPERBOARD PRODUCT COMPRISING AT LEAST ONE PLY CONTAINING HIGH YIELD PULP AND ITS PRODUCTION METHOD
Abstract:
A method of producing a paper or paperboard product having at least one ply comprising high yield pulp (HYP), comprising the steps of: – providing a furnish comprising at least 50% of high yield pulp (HYP) of a total pulp content in said furnish, said high yield pulp being produced with a wood yield above 85%; – dewatering the furnish to form a moist web and pressing said moist web to a dry solids content of at least 40–70%; and – densifying the moist web to a density above 600 kg/m3 in a press nip of a paper machine at a temperature above a softening temperature of water-saturated lignin comprised in said high yield pulp to provide a paper or paperboard product, containing at least 30% high yield pulp (HYP) of a total pulp content of said product.