EP 2723943 B1 20180725 - METHOD FOR PRODUCING PAPER, PAPERBOARD, AND CARDBOARD
Title (en)
METHOD FOR PRODUCING PAPER, PAPERBOARD, AND CARDBOARD
Title (de)
VERFAHREN ZUR HERSTELLUNG VON PAPIER, PAPPE UND KARTON
Title (fr)
PROCÉDÉ DE FABRICATION DE PAPIER, DE PAPIER-CARTON ET DE CARTON COMPACT
Publication
Application
Priority
- EP 11170740 A 20110621
- EP 2012061248 W 20120614
- EP 12728465 A 20120614
Abstract (en)
[origin: WO2012175392A1] The invention relates to a method for producing paper, paperboard, and cardboard, comprising dewatering a paper material having filler material and having at least one water-soluble amphoteric copolymer, forming sheets in the wire section, and then pressing the paper in the press section, wherein the at least one water-soluble amphoteric copolymer is metered and added to a paper material having a fiber concentration in the range from 20 to 40 g/L, then the paper material is diluted to a fiber concentration in the range from 5 to 15 g/L, the diluted paper material is dewatered to form a sheet and the sheet is pressed in the press section to a solids content of G(x) wt % or greater, and G(x) is calculated as G(x) = 48 + (x - 15) · 0.4, where x stands for the numerical value of the minimum solids content (in wt%) to which the sheet is pressed, wherein the water-soluble amphoteric copolymer can be obtained by polymerizing a mixture of a) 20 to 60 mol% of acrylamide relative to the total moles of the monomers used for polymerization, b) 20 to 60 mol%, relative to the total moles of the monomers used for polymerization, of at least one cationic monomer, c) 20 to 60 mol%, relative to the total moles of the monomers used for polymerization, of at least one anionic monomer selected from monoethylene unsaturated C3- to C5-carbolic acids, monoethylene unsaturated C3- to C5-dicarbolic acids, sulfonic acids, phosphonic acids, and/or the salts of said acids, d) 0 to 30 mol%, relative to the total moles of the monomers used for polymerization, of one or more monoethylene unsaturated monomers different from the monomers (a), (b), and (c), and e) 0 to 5 mol%, relative to the total moles of the monomers used for polymerization, of one or more compounds comprising at least two ethylene unsaturated double bonds in the molecule, wherein the amount of the difference between the proportions of the cationic and the anionic monomers in mol%, each relative to the total moles of the monomers used for polymerization, is a maximum of 10 mol%.
IPC 8 full level
D21H 17/34 (2006.01); D21H 17/37 (2006.01); D21H 17/40 (2006.01); D21H 17/41 (2006.01); D21H 17/42 (2006.01); D21H 17/43 (2006.01); D21H 17/44 (2006.01); D21H 17/67 (2006.01); D21H 21/06 (2006.01); D21H 21/18 (2006.01); D21H 21/20 (2006.01); D21H 23/28 (2006.01)
CPC (source: EP)
D21H 17/34 (2013.01); D21H 17/375 (2013.01); D21H 17/40 (2013.01); D21H 17/41 (2013.01); D21H 17/42 (2013.01); D21H 17/43 (2013.01); D21H 17/44 (2013.01); D21H 17/67 (2013.01); D21H 21/06 (2013.01); D21H 21/18 (2013.01); D21H 21/20 (2013.01); D21H 23/28 (2013.01)
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
DOCDB simple family (publication)
WO 2012175392 A1 20121227; BR 112013032550 A2 20170117; BR 112013032550 A8 20201027; BR 112013032550 B1 20210518; CN 103620115 A 20140305; CN 103620115 B 20160720; EP 2723943 A1 20140430; EP 2723943 B1 20180725; ES 2692543 T3 20181204; PL 2723943 T3 20190131; PT 2723943 T 20181113
DOCDB simple family (application)
EP 2012061248 W 20120614; BR 112013032550 A 20120614; CN 201280030599 A 20120614; EP 12728465 A 20120614; ES 12728465 T 20120614; PL 12728465 T 20120614; PT 12728465 T 20120614