EP 3697964 A1 20200826 - METHOD FOR PRODUCING SINGLE-LAYER OR MULTI-LAYER PAPER
Title (en)
METHOD FOR PRODUCING SINGLE-LAYER OR MULTI-LAYER PAPER
Title (de)
VERFAHREN ZUR HERSTELLUNG VON EINLAGIGEM ODER MEHRLAGIGEM PAPIER
Title (fr)
PROCÉDÉ DE FABRICATION DE PAPIER MONOCOUCHE OU MULTICOUCHE
Publication
Application
Priority
- EP 17197011 A 20171018
- EP 2018077623 W 20181010
Abstract (en)
[origin: WO2019076703A1] The invention relates to a method for producing dried single-layer or multi-layer paper, comprising the following steps for a single-layer paper: (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.-%; (D-1) dewatering the first fibrous material web by pressing, whereby a partially dewatered first fibrous material web is produced; (E-1) spraying at least one flat side of the partially dewatered first fibrous material web with a spraying solution or spraying suspension, such that a sprayed partially dewatered first fibrous material web is produced; (F-1) dewatering the sprayed partially dewatered first fibrous material web with the application of heat, such that the dried single-layer paper is produced; or, for a multi-layer paper, comprising the preceding step (A) and the following steps: (B) dewatering a second aqueous fibrous material suspension, such that a second fibrous material web is produced having a dry content between 14 wt.% and 25 wt.%; (C) joining the first fibrous material web to the second fibrous material web in such a way that the two fibrous material webs contact each other across all of one flat side, such that a layer composite is produced; (D-2) dewatering the layer composite by pressing, such that a partially dewatered layer composite is produced; (E-2) spraying at least one flat side of the partially dewatered layer composite with a spraying solution or spraying suspension, such that a sprayed layer composite is produced; (F-2) dewatering the sprayed layer composite by the application of heat, such that the dried multi-layer paper is produced; wherein the spraying solution or spraying suspension contains (e-a) water and (e-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 monomers of formula (I) polymerised into the polymer P with the formation of primary amino 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 17/42 (2006.01); D21H 17/45 (2006.01); D21H 17/55 (2006.01); D21H 23/26 (2006.01); D21H 25/06 (2006.01); D21H 27/30 (2006.01)
CPC (source: EP US)
D21F 11/04 (2013.01 - US); D21H 17/34 (2013.01 - EP US); D21H 17/37 (2013.01 - EP US); D21H 17/42 (2013.01 - EP); D21H 17/45 (2013.01 - EP); D21H 17/55 (2013.01 - EP); D21H 21/20 (2013.01 - US); D21H 23/26 (2013.01 - EP); D21H 23/50 (2013.01 - EP US); D21H 25/06 (2013.01 - EP); 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
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
WO 2019076703 A1 20190425; AU 2018350558 A1 20200521; AU 2018350558 B2 20220804; BR 112020007762 A2 20201020; CA 3079290 A1 20190425; CN 111566284 A 20200821; EP 3697964 A1 20200826; EP 3697964 B1 20240626; MX 2020004315 A 20200813; RU 2020115298 A 20211118; RU 2020115298 A3 20220429; US 11293143 B2 20220405; US 2021189658 A1 20210624
DOCDB simple family (application)
EP 2018077623 W 20181010; AU 2018350558 A 20181010; BR 112020007762 A 20181010; CA 3079290 A 20181010; CN 201880081543 A 20181010; EP 18782462 A 20181010; MX 2020004315 A 20181010; RU 2020115298 A 20181010; US 201816757525 A 20181010