Chemithermomechanical pulping process employing separate alkali

Details Chemithermomechanical pulping process employing separate alkali Chemithermomechanical pulping process employing separate alkali

1983-11-14

1984-12-04

Smith, William

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Chemical treatment after start or completion of mechanical...

162 26, 162 28, 162 86, 162 71, D21B 102

Patent

active

044862679

ABSTRACT:
A high yield chemithermomechanical (CTMP) process for obtaining high strength hardwood pulps is disclosed wherein hardwood chips are subjected to a two-stage chemical treatment prior to defibration, the first consisting of chip impregnation and reaction with an alkaline liquor followed by a second stage treatment with sulfite and/or bisulfite; in one embodiment peroxide is added to the alkaline liquor to enhance brightness.

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Katz et al., "A Mechanism for the Alkali Strengthening of Mechanical Pulps," TAPPI, Jul., 1981.
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Casey, "Pulp and Paper Chemistry and Chemical Technology".
Lachenal et al., "Hardwood Hydrogen Peroxide Chemimechanical Pulps", TAPPI, May, 1979.

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