METHOD FOR BLEACHING FIBROUS MATERIALS

European Patent Office Patent

PATENT NO 1631716
APP PUB NO EP-1631716-A2
SERIAL NO

04731629

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Abstract

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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.

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Patent Owner(s)

Patent OwnerAddress
NEUMANN FRANK-MARTINDE79761 WALDSHUT-TIENGEN

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Inventor(s)

Inventor Name Address
BERGMANN HANS-PETER 79774 ALBBRUCK
NEUMANN FRANK-MARTIN 79862 HÖCHENSCHWAND
SCHMIDT HASN-PETER 79736 RICKENBACH

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