Apparatus for displacement washing of fibrous material suspended

Details Apparatus for displacement washing of fibrous material suspended Apparatus for displacement washing of fibrous material suspended

1978-10-12

1980-07-22

Fisher, Richard V.

Paper making and fiber liberation

Apparatus

Digester

68181R, 162243, D21C 902

Patent

active

042138221

ABSTRACT:
Apparatus for the displacement washing of cellulose fibers suspended in a liquid, as produced by cooking wood pulp in a digester vessel 1. As the fiber suspension settles to the bottom of the vessel it passes through a plurality of axially spaced washing zones 6, whereat water is forced through the suspension in a radial direction from central inlet conduits 16, 16a, 16b to peripheral outlet chambers 9, or vice versa. Such flow displaces the suspension or cooking liquid, and the washed fibers are withdrawn through a bottom outlet 5. The washing liquid is sequentially recirculated through the zones 6 for economy, and the buildup of fibers on the recirculating conduits 19a, 21a, 24a in the vessel is prevented by perforated water discharge pipes 26 disposed just above the conduits.

REFERENCES:
patent: 3475271 (1969-10-01), Laakso
patent: 3595038 (1971-07-01), Bergholm et al.
patent: 3787284 (1974-01-01), Richter
patent: 3807202 (1974-04-01), Gunkel
patent: 3814663 (1974-06-01), Ingemarsson

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