Title:
METHOD FOR BLEACHING FIBROUS MATERIALS
Document Type and Number:
WIPO Patent Application WO2004099492
Kind Code:
A3
Abstract:
The invention relates to a method for bleaching fibrous materials, in particular lignin-containing materials for producing paper consisting in adding at least a first additive and at least one type of bleaching liquid to a fibrous solution which contains at list one bleaching agent. After mixing said bleaching solution with the fibrous suspension and at the end of determined bleaching time, the bleaching process is ended by adding at least a second additive. Said invention is characterised in that the pH of the fibrous suspension is obtained by adding lime.
Inventors:
BERGMANN HANS-PETER (DE)
NEUMANN FRANK-MARTIN (DE)
SCHMIDT HASN-PETER (DE)
NEUMANN FRANK-MARTIN (DE)
SCHMIDT HASN-PETER (DE)
Application Number:
PCT/EP2004/004914
Publication Date:
December 09, 2004
Filing Date:
May 07, 2004
Export Citation:
Assignee:
PAPIERFABRIK ALBBRUCK GMBH & C (DE)
BERGMANN HANS-PETER (DE)
NEUMANN FRANK-MARTIN (DE)
SCHMIDT HASN-PETER (DE)
BERGMANN HANS-PETER (DE)
NEUMANN FRANK-MARTIN (DE)
SCHMIDT HASN-PETER (DE)
International Classes:
D21C9/10; (IPC1-7): D21C9/10
Foreign References:
| EP0622491A2 | 1994-11-02 | |||
| US6432266B1 | 2002-08-13 | |||
| DE939725C | 1956-03-01 | |||
| US2101706A | 1937-12-07 | |||
| US5401362A | 1995-03-28 | |||
| US5639347A | 1997-06-17 | |||
| US4039372A | 1977-08-02 | |||
| GB1091124A | 1967-11-15 |
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