Process for the manufacturing of cellulose pulp
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United States of America Patent
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Issued Date -
Nov 17, 2005
app pub date -
Nov 15, 2004
filing date -
Jun 3, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention concerns a method for the production of cellulose pulp. A wood raw material that principally comprises softwood, preferably in the form of cut wood chips, is treated in several stages in various treatment steps. One of the stages is cooking the material in an alkali cooking fluid, with the aim of obtaining improved quality with respect to tensile strength, and of obtaining higher yield. A controlled addition of wood raw material in the form of hardwood at an amount corresponding to 1-20% of the amount of softwood, preferably 3-15%, and more preferably at least 5%, takes place.
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