Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1977-01-14
1978-02-14
Fisher, Richard V.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
162 33, 162 35, 162 40, 162 62, 162 82, 162 90, D21C 302, D21C 324, D21C 1104
Patent
active
040736784
ABSTRACT:
70 To 85% yield semichemical wood pulping may be prepared for mechanical defibration by cooking comminuted hardwood in a continuous digestion vessel with an alkaline cooking solution wherein 50 to 100% as sodium oxide thereof is sodium carbonate. The solution may be formulated from unmodified kraft recovery process green liquor or, if a sulfur free cooking process is desired, the solution may be formulated from soda ash.
REFERENCES:
patent: 1921539 (1933-08-01), Richter
Christiansen, C. B., Tappi, vol. 43, #6, June 1960, pp. 586-590.
Hammond Jack A.
Karter Elias M.
Fisher Richard V.
Marcontell W. Allen
Schmalz Richard L.
Smith William F.
Westvaco Corporation
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