Elimination of alum yellowing of aspen thermomechanical pulp...

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Chemical treatment after start or completion of mechanical...

Reexamination Certificate

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C162S025000, C162S079000, C162S083000, C162S060000, C162S049000, C241S015000, C241S019000

Reexamination Certificate

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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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patent: 4810328 (1989-03-01), Freis et al.
patent: 5405498 (1995-04-01), Pease
patent: 5415734 (1995-05-01), Backlund et al.
patent: 5464502 (1995-11-01), Pease
patent: 5601921 (1997-02-01), Eriksson
patent: 5607546 (1997-03-01), H oglund et al.
patent: 6511579 (2003-01-01), Edwards et al.

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