Process for making lyocell fiber from sawdust pulp

Details Process for making lyocell fiber from sawdust pulp Process for making lyocell fiber from sawdust pulp

2005-03-01

2005-03-01

Tentoni, Leo B. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

C162S009000, C162S065000, C162S079000, C162S090000, C264S203000

Reexamination Certificate

active

06861023

ABSTRACT:
A process for making lyocell fibers including the steps of pulping raw material in a digester to provide an alkaline pulp, wherein the raw material includes sawdust in an amount greater than 0% up to 100%; contacting the alkaline pulp including cellulose and at least about 7% hemicellulose under alkaline conditions with an amount of an oxidant sufficient to reduce the average degree of polymerization of the cellulose to the range of from about 200 to about 1100 without substantially reducing the hemicellulose content or substantially increasing the copper number of the pulp; and forming fibers from the pulp.

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