EP 0946819 A1 19991006 - BLEACHING OF CELLULOSIC PULP WITH OZONE AND PERACID
Title (en)
BLEACHING OF CELLULOSIC PULP WITH OZONE AND PERACID
Title (de)
BLEICHEN VON ZELLSTOFF MIT OZON UND PERSÄURE
Title (fr)
BLANCHIMENT DE PATE A PAPIER CELLULOSIQUE A L'AIDE D'OZONE ET DE PERACIDE
Publication
Application
Priority
- FI 9700730 W 19971126
- FI 964715 A 19961126
Abstract (en)
[origin: WO9823811A1] The invention concerns a method for the production of pulp. According to this method, pulp is treated with ozone in at least one bleaching stage. In accordance with the invention, ozone-treated pulp is brought into contact with a peroxy alkanoic acid under acid conditions in order to reduce the pulp's alkali lability, and the resulting pulp is subjected to an alkaline extraction stage or peroxide bleaching stage. The bleaching sequences are thus of teh type Z/Paa/E or Z/Paa/P, for example. The pulp produced according to the invention has a kappa number of less than 2, a viscosity of more than 600 ml/g, a tear index (T70) of over 13 mN.m<2>/g and a zero-span tensile index (T70) as measured from a wet sheet of over 100 N.m/g.
IPC 1-7
IPC 8 full level
D21C 9/153 (2006.01); D21C 9/16 (2006.01)
CPC (source: EP)
D21C 9/153 (2013.01); D21C 9/166 (2013.01)
Citation (search report)
See references of WO 9823811A1
Designated contracting state (EPC)
AT CH DE FR LI PT SE
DOCDB simple family (publication)
WO 9823811 A1 19980604; AU 5056198 A 19980622; CA 2270967 A1 19980604; EP 0946819 A1 19991006; FI 964715 A0 19961126; FI 964715 A 19980527
DOCDB simple family (application)
FI 9700730 W 19971126; AU 5056198 A 19971126; CA 2270967 A 19971126; EP 97913227 A 19971126; FI 964715 A 19961126