Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1976-11-24
1978-05-30
Fisher, Richard V.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
162237, 162246, 162DIG2, D21C 324, D21C 326, D21C 706
Patent
active
040922120
ABSTRACT:
Impregnation of fiber material before digestion is accomplished utilizing a minimum amount of equipment. Liquid with entrained fiber material -- both fiber material sufficiently impregnated with liquid to be denser than the liquid and material insufficiently impregnated to be denser than the liquid -- is fed from a high-pressure transfer valve to an inlet at the top of a continuous digester. The digester has an outlet disposed vertically above the inlet, and liquid along with fiber material of lesser density than the liquid is withdrawn from the outlet. The withdrawn liquid and fiber material is recirculated back to the transfer valve through a conduit adapted to allow the passage of fiber material entrained in liquid therethrough. Each individual portion of fiber material is continuously circulated until it becomes sufficiently impregnated with liquid to descend into the digester and form a fiber column therein.
REFERENCES:
patent: 3579418 (1971-05-01), Ostberg
patent: 3586600 (1971-06-01), Rich et al.
patent: 4028171 (1977-06-01), Richter
Richter Johan C. F. C.
Richter Ole Johan
Fisher Richard V.
Kamyr Aktiebolag
Smith William F.
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