Patent Number: 6,254,722

Title: Method for making dissolving pulp from paper products containing hardwood fibers

Abstract: A method for making dissolving pulp from cellulosic fiber. The fiber is treated with a 3-stage sequence having a first alkali extraction stage, a xylanase treatment stage, and a second alkali extraction stage. Having the xylanase treatment stage sandwiched between 2 alkali extraction stages results in the dissolving pulp exhibiting both a very low xylan content of about 2.6% by weight or less and a very low mannan content of about 1.5% by weight or less. The low contents of these 2 components cannot be achieved with comparison treatments of only an alkali extraction stage, only a xylanase treatment stage, or only 2 stages of a xylanase treatment stage and an alkali extraction stage.

Inventors: Jackson; Larry S. (Raleigh, NC), Joyce; Thomas W. (Raleigh, NC), Heitmann, Jr.; John A. (Raleigh, NC)

Assignee: North Carolina State University

International Classification: D21C 5/00 (20060101); D21C 9/00 (20060101); D21C 5/02 (20060101); D21C 3/00 (20060101); D21C 3/02 (20060101); D21H 011/20 ()

Expiration Date: 07/03/2018