Method for treating refined mechanical pulp and thermo mechanica

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

1979-12-07

1981-07-21

Smith, William F.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With plural or specified mechanical defibering step

162 65, D21B 114, D21C 910

Patent

active

042796946

ABSTRACT:
When treating refined mechanical pulp and thermo mechanical pulp with ozone, it is of great importance that the process be carried out at the most favorable 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 consistency ozonizer and maturation reactor for a time limited to maximum 30 minutes. From the reactor the pulp is passed direct 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.

REFERENCES:
patent: 4123317 (1978-10-01), Fritzvold et al.
Norsk Skogindustri Oct. 1973 pp. 274-277.
Norsk Skogindustri Feb. 1968 pp. 46-52.

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