EP 4189162 A1 20230607 - METHOD FOR MANUFACTURING PAPER AND CARDBOARD
Title (en)
METHOD FOR MANUFACTURING PAPER AND CARDBOARD
Title (de)
VERFAHREN ZUR HERSTELLUNG VON PAPIER UND KARTON
Title (fr)
PROCEDE DE FABRICATION DE PAPIER ET DE CARTON
Publication
Application
Priority
- FR 2008078 A 20200730
- FR 2021051158 W 20210624
Abstract (en)
[origin: WO2022023631A1] The present invention relates to a method for manufacturing a sheet of paper or cardboard, which comprises adding a water-soluble polymer P with a weight-average molecular weight greater than 750,000 daltons to a fibrous suspension. This method comprises the following successive steps: - preparing an aqueous solution A containing at least one water-soluble polymer P at a concentration C of 0.1 to 0.5% by weight, said polymer P having a factor F(C) strictly greater than 4, with F(C) = Δ600/C, Δ600 being the slope to reach 90% of the viscosity developed by the aqueous solution A at 600 seconds at 25°C, obtained from the viscosity curve of the aqueous solution A as a function of time, at the given concentration C, at 25°C, - adding the aqueous solution A to the fibrous suspension, at one or more injection points, - forming a sheet of paper or cardboard.
IPC 8 full level
D21H 17/34 (2006.01); D21H 21/10 (2006.01); D21H 21/52 (2006.01)
CPC (source: EP US)
D21H 17/34 (2013.01 - EP); D21H 17/43 (2013.01 - US); D21H 17/455 (2013.01 - US); D21H 17/66 (2013.01 - US); D21H 17/675 (2013.01 - US); D21H 17/74 (2013.01 - US); D21H 21/10 (2013.01 - EP US); D21H 21/52 (2013.01 - EP); D21H 23/06 (2013.01 - US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
WO 2022023631 A1 20220203; BR 112023001079 A2 20230307; CA 3187065 A1 20220203; CN 116096963 A 20230509; CN 116096963 B 20240517; EP 4189162 A1 20230607; FR 3113069 A1 20220204; FR 3113069 B1 20221014; US 2023295877 A1 20230921
DOCDB simple family (application)
FR 2021051158 W 20210624; BR 112023001079 A 20210624; CA 3187065 A 20210624; CN 202180058288 A 20210624; EP 21743222 A 20210624; FR 2008078 A 20200730; US 202118006280 A 20210624