Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1981-05-12
1985-10-15
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 59, 162250, 162251, 210805, D21C 714
Patent
active
045472645
ABSTRACT:
A method and apparatus for selectively withdrawing liquor from digester cooking screens for controlling the temperature in continuous digesters. First and second pairs of screens, with cooperating headers, are provided, and first and second outlets spaced circumferentially around the digester are associated with each header. Each header provides a circumferential cavity free of dividing members. Within each pair of screens withdrawal is practiced so that each header is rested during each ultimate withdrawal step, and the side from which the liquor is drawn each successive withdrawal step that the same header is used is alternated. In practicing the invention, header blockage caused by deposited debris and scale is minimized and increased uniformity and improved product quality result.
REFERENCES:
patent: 2695233 (1954-11-01), Richter
patent: 3711367 (1973-01-01), Christenson
patent: 3811994 (1974-05-01), Ostberg
patent: 4061193 (1977-12-01), Laakso et al.
Phillips Joseph R.
Sherman Michael I.
Alvo Steve
Kamyr Inc.
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