Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Reexamination Certificate
2005-01-18
2005-01-18
Griffin, Steven P. (Department: 1731)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
C162S052000, C162S061000, C162S068000
Reexamination Certificate
active
06843885
ABSTRACT:
The method is for controlling the cooking temperature in a continuous vapour phase digester for chip-shaped cellulose material. A high pressure is established in the vapour phase largely by means of steam, without risk of attaining excessively high temperatures in the cooking. A temperature-controlled supply of cooking liquor in close proximity to the surface of the liquor level is introduced to obtain a protective liquor surface with a temperature lower than the vapour phase. A lower initial cooking temperature is obtained in the cooking zone, which ensures that the exothermic cooking process does not lead to the attainment of temperatures detrimental to the pulp quality.
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patent: 5635025 (1997-06-01), Bilodeau
patent: 5882477 (1999-03-01), Laakso et al.
patent: 0670925 (1997-12-01), None
Gustavsson Lennart
Snekkenes Vidar
Fasth Rolf
Fasth Law Offices
Griffin Steven P.
Kvaerner Pulping AB
Parker Kara M.
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