Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Reexamination Certificate
2007-02-27
2007-02-27
Fortuna, José A. (Department: 1731)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
C162S037000, C162S056000, C162S065000, C162S078000, C162S088000
Reexamination Certificate
active
10344425
ABSTRACT:
Methods for bleaching chemical pulp are disclosed including dewatering the pulp to a concentration of from 25 to 40%, bleaching in a first chlorine dioxide stage, followed by a second alkaline bleaching stage, followed by a third chlorine dioxide bleaching stage, dewatering the bleached pulp to a concentration of from 10 to 40% and producing a filtrate, and recycling the filtrate to control the pulp concentration of the dewatered chemical pulp to from 8 to 15% in the first bleaching stage.
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Carré Gunnar
Lindström Lars-Åke
Norden Solveig
Fortuna Jos'e A.
Lerner David Littenberg Krumholz & Mentlik LLP
Metso Paper Inc.
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