Method for treating refined mechanical pulp and thermo...

Details Method for treating refined mechanical pulp and thermo... Method for treating refined mechanical pulp and thermo...

D - Textiles, Paper

21

C

92/34

D21C 9/00 (2006.01) D21C 9/10 (2006.01) D21D 1/20 (2006.01)

Patent

CA 1091072

ABSTRACT OF THE DISCLOSURE When treating refined mechanical pulp and thermo mechanical pulp with ozone, it is of importance that the process is carried out at the most favourable conditions and with a minimum consumption of energy. According to the present invention the pulp is refined to a freeness value of at least 200 csf in a first stage refiner from which the pulp is passed to a high con- sistency ozonizer and maturation reactor for a time limited to maximum 30 minutes. From the reactor the pulp is passed directly to a second stage refiner, the pulp then having a solids content of approximately 8-10% and an alkaline value in the range of 7-10.

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