Continuous digestion of chip blends containing a western red...

Details Continuous digestion of chip blends containing a western red... Continuous digestion of chip blends containing a western red...

D - Textiles, Paper

21

C

D21C 9/10 (2006.01) D21C 3/00 (2006.01) D21H 11/08 (2006.01)

Patent

CA 2691460

A continuous process is provided for delignifying lignocellulosic material, including feeding a lignocellulosic blend comprising a Western Red Cedar (WRC) chip furnish and a second lignocellulosic material into an aqueous alkaline pulping solution at the feed end of a digester to produce a lignocellulosic mass. The second lignocellulosic material is provided in a proportion that increases the density of the mass to enable the mass to move through the digester while minimizing production effects associated with low density WRC chips. The mass moves through the digester to produce a pulp that may be bleached to have a kappa no greater than 5, a yield of at least 38%, a fiber length no greater than 2.2mm, a coarseness no greater than 0.16mg/m, a freeness no greater than 610mL, a tensile strength of at least 8.0 km at 500 CSF, and a porosity no greater than 60 Gurley sec at 500 CSF.

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