EP 0700473 B1 20000405 - PROCESS FOR PRODUCING PAPER
Title (en)
PROCESS FOR PRODUCING PAPER
Title (de)
VERFAHREN ZUR PAPIERHERSTELLUNG
Title (fr)
PROCEDE POUR LA FABRICATION DU PAPIER
Publication
Application
Priority
- FI 9300019 W 19930120
- FI 920246 A 19920120
Abstract (en)
[origin: WO9314263A1] The invention relates to a process for the production of paper by adding to an aqueous fiber suspension, which possibly contains a filler, auxiliary agents for improving retention and/or dewatering, the auxiliary agents being a cationic long-chain polyacrylamide and an aluminum salt, and by dewatering the obtained fiber suspension during the sheet-forming stage. According to the invention, the said aqueous fiber suspension, possibly containing a filler, to which the cationic long-chain polyacrylamide has first been added, is subjected to shearing forces, whereafter there is added to it, directly before sheet forming, a polymeric aluminum salt or an aluminum salt, in which case a base or an acid is added, when necessary, to the said fiber suspension so that the pH be within the range 7-9 before the sheet forming, in which case aluminum hydroxy particles having anionic surface charges will be formed in situ.
IPC 1-7
IPC 8 full level
D21H 17/44 (2006.01); D21H 17/37 (2006.01); D21H 17/45 (2006.01); D21H 17/55 (2006.01); D21H 17/56 (2006.01); D21H 17/63 (2006.01); D21H 17/65 (2006.01); D21H 17/66 (2006.01); D21H 21/10 (2006.01); D21H 23/14 (2006.01)
IPC 8 main group level
D21H (2006.01)
CPC (source: EP)
D21H 17/375 (2013.01); D21H 17/455 (2013.01); D21H 17/55 (2013.01); D21H 17/56 (2013.01); D21H 17/66 (2013.01); D21H 21/10 (2013.01); D21H 23/14 (2013.01)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 9314263 A1 19930722; AT E191524 T1 20000415; AU 3354193 A 19930803; AU 660066 B2 19950608; CA 2127992 A1 19930722; DE 69328311 D1 20000511; DE 69328311 T2 20000810; DE 69328311 T3 20030731; EP 0700473 A1 19960313; EP 0700473 B1 20000405; EP 0700473 B2 20030122; ES 2146609 T3 20000816; ES 2146609 T5 20030701; FI 920246 A0 19920120; FI 943425 A0 19940719; FI 943425 A 19940719; JP 3138475 B2 20010226; JP H07502791 A 19950323; PT 700473 E 20000731
DOCDB simple family (application)
FI 9300019 W 19930120; AT 93902274 T 19930120; AU 3354193 A 19930120; CA 2127992 A 19930120; DE 69328311 T 19930120; EP 93902274 A 19930120; ES 93902274 T 19930120; FI 920246 A 19920120; FI 943425 A 19940719; JP 51217793 A 19930120; PT 93902274 T 19930120