EP 0223223 B1 19900307 - PROCESS FOR THE PRODUCTION OF PAPER AND CARDBOARD
Title (en)
PROCESS FOR THE PRODUCTION OF PAPER AND CARDBOARD
Publication
Application
Priority
DE 3541163 A 19851121
Abstract (en)
[origin: US4749444A] Paper and cardboard are produced by draining a paper stock by a method in which a stock having a consistency of from 2.5 to 5% by weight is used as a starting material, and (a) from 0.1 to 2% by weight of an activated bentonite are added and the stock consistency is then brought to 0.3-2% by weight by dilution with water, after which (b) from 0.01 to 0.1% by weight of a cationic polyelectrolyte having a charge density of not less than 4 meq/g of polyelectrolyte is added and distributed therein, and, after thorough mixing (c) from 0.003 to 0.3% by weight of a high molecular weight polymer based on acrylamide or methacrylamide is metered in and mixed with the paper stock, the percentages in each case being based on dry paper stock, and the resulting pulp is drained on a wire. The paper obtained is distinguished in particular by good printing properties in the offset printing process.
IPC 1-7
IPC 8 full level
D21H 17/34 (2006.01); D21H 17/37 (2006.01); D21H 17/45 (2006.01); D21H 17/46 (2006.01); D21H 17/55 (2006.01); D21H 17/56 (2006.01); D21H 17/67 (2006.01); D21H 17/68 (2006.01); D21H 21/10 (2006.01); D21H 23/76 (2006.01)
CPC (source: EP US)
D21H 17/375 (2013.01 - EP US); D21H 17/455 (2013.01 - EP US); D21H 17/55 (2013.01 - EP US); D21H 17/56 (2013.01 - EP US); D21H 17/68 (2013.01 - EP US); D21H 23/765 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0223223 A1 19870527; EP 0223223 B1 19900307; AT E50814 T1 19900315; AU 578404 B2 19881020; AU 6397786 A 19870528; CA 1278403 C 19910102; DE 3541163 A1 19870527; DE 3669336 D1 19900412; FI 85397 B 19911231; FI 85397 C 19920410; FI 864294 A0 19861023; FI 864294 A 19870522; JP H0159399 B2 19891218; JP S62125098 A 19870606; NO 168593 B 19911202; NO 168593 C 19920311; NO 864644 D0 19861120; NO 864644 L 19870522; NZ 217951 A 19881028; US 4749444 A 19880607
DOCDB simple family (application)
EP 86115915 A 19861117; AT 86115915 T 19861117; AU 6397786 A 19861016; CA 520637 A 19861016; DE 3541163 A 19851121; DE 3669336 T 19861117; FI 864294 A 19861023; JP 27307986 A 19861118; NO 864644 A 19861120; NZ 21795186 A 19861015; US 92060486 A 19861020