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.
Elimination Of Alum Yellowing Of Aspen Thermomechanical Pulp Through Pulp Washing
Robin Kilgannon - New City NY, US Robert Kane - Sartell MN, US Eileen Joy - Armonk NY, US Anik Dewan - Monroe NY, US
International Classification:
D21B 1/12 D21C 9/02
US Classification:
162023000, 162060000, 162061000
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.