Crown Zellerbach Corporation

Other

Fujii, John S.

John S Fujii

William G Whalley

Fred L Schmidt

A method for the dry-formation of a deep drawn, three-dimensional wood fiber structural core is provided. The method comprises providing a preformed, substantially flat, dry-formed mat of wood fibers, providing a three-dimensional mold, introducing the dry-formed mat of wood fibers into the three-dimensional mold, and drawing and molding the mat of wood fibers into said three-dimensional wood fiber structural core.

Dry-forming three dimensional wood fiber webs

Lignocellulose is treated with an alkaline pretreatment liquor containing anthraquinone or other pretreatment agent in a continuous process in which the lignocellulose and pretreatment liquor flow countercurrently. The pretreatment agent is substantially soluble in the pretreatment liquor introduced into the pretreatment zone and is substantially insoluble in the pretreatment liquor withdrawn from the pretreatment zone, with the result that the pretreatment agent is effectively recycled within the pretreatment zone.

Continuous countercurrent pretreatment of lignocellulose with

By pretreating lignocellulose with an alkaline pretreatment liquor containing anthraquinone or a related compound, prior to alkaline digestion, a higher yield of pulp having a lower lignin content can be produced using less alkali. The pretreatment step is carried out under conditions that ensure survival of at least 50% of the anthraquinone or related compound in the pretreatment liquor, which is separated from the pretreated lignocellulose and reused to pretreat other lignocellulose.

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Vancouver, WA, United States of America

John S Fujii