Method in the production of dissolving pulp

Details Method in the production of dissolving pulp Method in the production of dissolving pulp

1981-02-06

1982-11-30

Smith, William F.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With chemical or physical modification of liberated fiber

162 13, 162 26, 162 90, D21C 900

Patent

active

043614639

ABSTRACT:
A process for producing a highly qualified dissolving pulp sheet is disclosed, wherein the pulp sheet exhibits reduced swelling tendencies and improved mercerizing properties, combined with at least reduced need for dialysis of the mercerization liquor in any subsequent viscose processing, while reducing the energy consumption in the treatment process. A substantial proportion of the hemicellulose in a pre-hydrolyzed bleached sulfate cellulosic pulp is removed by contacting the pulp with an aqueous solution of sodium hydroxide. The pulp is subjected to mechanical working under a net energy supply of 15-100 KWh/ton pulp to split the primary layer, and at least the outer parts of the secondary layer, of the pulp fibers substantially without fibrillation. The pulp can be washed, dried and pressed to form sheets.
The dissolving pulp produced by this process is suitable for the production of reinforcing cord, such as tire cords and the like.

REFERENCES:
patent: 1857100 (1932-05-01), McCormick et al.
patent: 3915959 (1975-10-01), Goheen et al.

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