Method for bleaching fibrous materials
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United States of America Patent
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Issued Date -
Jun 22, 2006
app pub date -
May 7, 2004
filing date -
May 8, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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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.
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