Extraction with compaction and springback considerations

Details Extraction with compaction and springback considerations Extraction with compaction and springback considerations

2006-12-12

2006-12-12

Hug, Eric (Department: 1731)

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With classifying, separating or screening of pulp

C162S017000, C162S018000, C162S237000, C162S251000

Reexamination Certificate

active

07147750

ABSTRACT:
A vessel is constructed with (preferably substantially stationary) screen surfaces which minimize compaction of comminuted cellulosic fibrous material, and allow springback of the material, as it flows downwardly. A slurry of wood chips, sawdust, or pulp is passed downwardly past one or more screen surfaces, which have a number of parts, including at least a first perforated part through which liquid is extracted, and a substantially solid part substantially immediately adjacent and below the first part which has a step out to relieve compaction and allow springback of the material.

REFERENCES:
patent: 4028171 (1977-06-01), Richter
patent: 4436586 (1984-03-01), Elmore
patent: 4836893 (1989-06-01), Gloersen
patent: 5985096 (1999-11-01), Marcoccia et al.
patent: 6039841 (2000-03-01), Hernesniemi
patent: 6129816 (2000-10-01), Sheerer et al.
patent: 6272710 (2001-08-01), Prough

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