Paper making and fiber liberation – Apparatus – Digester
Patent
1993-09-02
1996-12-31
Lamb, Brenda A.
Paper making and fiber liberation
Apparatus
Digester
162243, D21C 706
Patent
active
055890369
ABSTRACT:
The flow patterns of the wood/paper pulp in a paper pulp treatment tower are controlled to provide for even flow through and discharge of the pulp from the upper end of the tower. Flow-altering fluids are injected into the pulp stock in the tower via appropriately positioned nozzles which create flow-altering fluid streams in the pulp stock. The streams are operable to produce either an inwardly directed pulp flow, or an outwardly directed pulp flow, whichever is desired. The system results in smooth, relatively even movement of the pulp stock from the bottom of the tower to the top, so that each fraction of the pulp mass will spend substantially the same dwell time in the tower, whereby the pulp mass is evenly processed and reacted in the tower. The resultant treated stock is superior to pulp stock treated in a tower without such flow controls.
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Champion International Corporation
Lamb Brenda A.
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