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1. (WO2018185216) PRODUCTION OF HIGHLY STRETCHABLE PAPER HAVING SATISFACTORY SURFACE PROPERTIES

Pub. No.:    WO/2018/185216    International Application No.:    PCT/EP2018/058720
Publication Date: Fri Oct 12 01:59:59 CEST 2018 International Filing Date: Fri Apr 06 01:59:59 CEST 2018
IPC: D21H 25/00
D21H 27/00
D21H 27/10
D21G 1/00
D21H 11/04
D21H 11/16
D21H 11/18
Applicants: BILLERUDKORSNÄS AB
Inventors: NORDLING, Nils
NORDSTRÖM, Fredrik
Title: PRODUCTION OF HIGHLY STRETCHABLE PAPER HAVING SATISFACTORY SURFACE PROPERTIES
Abstract:
There is provided a method of producing uncoated paper having a grammage according to ISO 536 of 50-250 g/m2, a Gurley value according to ISO 5636-5 of above 15 s and a stretchability according to ISO 1924-3 in the machine direction of at least 9 %, said method comprising the steps of:5 a) providing a pulp, preferably sulphate pulp; b) subjecting the pulp to high consistency (HC) refining; c) subjecting the pulp from step b) to low consistency (LC) refining; d) diluting the pulp from step c) and adding the diluted pulp to a forming wire to obtain a paper web having a dry content of 15-25 %, such as 17-23 %;10 e) pressing the paper web from step d) to a dry content of 30-50 %, such as 36-46 %; f) drying the paper web from step e); g) compacting the paper web from step f) in a Clupak unit at a moisture content of 20-50 %, such as 30-49 %, such as 35-49 %;15 h) drying the paper web from step g); and i) calendering the paper web from step h) in a soft nip calender or a long nip calender at a moisture content of 4-20 %, such as 5-12 %, such as 5-10 %.