Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Chemical treatment after start or completion of mechanical...
Reexamination Certificate
2006-03-28
2006-03-28
Halpern, Mark (Department: 1731)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Chemical treatment after start or completion of mechanical...
C162S025000, C162S079000, C162S083000, C162S060000, C162S049000, C241S015000, C241S019000
Reexamination Certificate
active
07018509
ABSTRACT:
This invention relates to an improved process for manufacturing bleached thermomechanical aspen pulp having reduced yellow after treatment with aluminum based chemicals such as alum which are used in paper making processes. In this improved process the pulp is washed prior to, after or between the bleaching stages or a combination of the foregoing.
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Dewan Anil K.
Joy Eileen M.
Kane Robert J.
Kilgannon Robin R.
Barnes, III Thomas W.
Halpern Mark
International Paper Co.
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