EP 3697963 B1 20240626 - METHOD FOR PRODUCING MULTIPLE PLY PAPER
Title (en)
METHOD FOR PRODUCING MULTIPLE PLY PAPER
Title (de)
VERFAHREN ZUR HERSTELLUNG VON MEHRLAGIGEM PAPIER
Title (fr)
PROCÉDÉ DE FABRICATION DE PAPIER MULTICOUCHE
Publication
Application
Priority
- EP 17197012 A 20171018
- EP 2018077622 W 20181010
Abstract (en)
[origin: WO2019076702A1] The invention relates to a method for producing dried multi-layer paper, comprising the following steps: (A) dewatering a first aqueous fibrous material suspension, whereby a first fibrous material web is produced having a dry content of between 14 wt.-% and 25 wt.-%; (B) dewatering a second aqueous fibrous material suspension, whereby a second fibrous material web is produced having a dry content between 14 wt.% and 25 wt.%; (C) spraying at least one flat side of the first fibrous material web, the second fibrous material web or the first fibrous material web and the second fibrous material web with a spraying solution or spraying suspension, whereby at least one sprayed fibrous material web having a sprayed flat side is produced; (D) joining the first fibrous material web to the second fibrous material web, at least one of the above two being a sprayed fibrous material web, such that a layer composite is produced; (E) dewatering the layer composite by pressing, such that a partially dewatered layer composite is produced; (F) dewatering the partially dewatered layer composite with the application of heat, such that the dried multi-layer paper is produced; wherein the spraying solution or spraying suspension contains (c-a) water and (c-b) at least one water-soluble polymer P, which can be obtained by the polymerisation of (i) 40 to 85 mol.% of a monomer of formula I, in which R1 = H or C1-C6-alkyl, (ii) 15 to 60 mol.% of one or more ethylenically unsaturated monomers that are different from a monomer of formula I, wherein the total quantity of all monomers (i) and (ii) is 100 mol.%, and optionally by a subsequent partial or complete hydrolisation of the units of the monomers of formula (I) polymerised into the polymer P with the formation of primary amino groups or amidine groups, the proportion of water being at least 75 wt.% relative to the spraying solution or the spraying suspension.
IPC 8 full level
D21H 23/50 (2006.01); D21H 17/34 (2006.01); D21H 17/37 (2006.01); D21H 17/45 (2006.01); D21H 21/18 (2006.01); D21H 21/20 (2006.01); D21H 23/22 (2006.01); D21H 23/26 (2006.01); D21H 23/28 (2006.01); D21H 25/04 (2006.01); D21H 25/06 (2006.01); D21H 27/30 (2006.01)
CPC (source: EP US)
D21F 9/02 (2013.01 - US); D21H 17/34 (2013.01 - EP); D21H 17/37 (2013.01 - EP US); D21H 17/43 (2013.01 - US); D21H 17/45 (2013.01 - EP); D21H 21/10 (2013.01 - US); D21H 21/18 (2013.01 - EP); D21H 21/20 (2013.01 - EP); D21H 23/22 (2013.01 - EP); D21H 23/26 (2013.01 - EP); D21H 23/28 (2013.01 - EP); D21H 23/50 (2013.01 - EP US); D21H 25/04 (2013.01 - EP); D21H 25/06 (2013.01 - EP US); D21H 27/30 (2013.01 - EP 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
DOCDB simple family (publication)
WO 2019076702 A1 20190425; AU 2018353342 A1 20200521; AU 2018353342 B2 20221208; BR 112020007763 A2 20201020; CA 3079287 A1 20190425; CN 111492108 A 20200804; EP 3697963 A1 20200826; EP 3697963 B1 20240626; MX 2020004322 A 20200803; RU 2020115598 A 20211118; RU 2020115598 A3 20220429; US 11680371 B2 20230620; US 2021222371 A1 20210722
DOCDB simple family (application)
EP 2018077622 W 20181010; AU 2018353342 A 20181010; BR 112020007763 A 20181010; CA 3079287 A 20181010; CN 201880081599 A 20181010; EP 18782461 A 20181010; MX 2020004322 A 20181010; RU 2020115598 A 20181010; US 201816757477 A 20181010