Process for preparing thermomechanical pulp with heat recovery

Details Process for preparing thermomechanical pulp with heat recovery Process for preparing thermomechanical pulp with heat recovery

1982-02-01

1983-12-20

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Mechanical defibration in the presence of heated gas or gas...

162 28, 162 47, 162 68, D21B 112, D21C 1106

Patent

active

044215959

ABSTRACT:
Procedure for preparing thermomechanical pulp from wood chips, wherein the chip flow is conducted from a storage reservoir under normal pressure through a first lock feeder into a pressurized steaming chamber, where the chips stay for a few minutes and are heated to an optimum temperature of 100.degree. to 125.degree. C., and from the steaming chamber through a second lock feeder to a feed means which supplies the chips into an enclosed hot refiner. In the procedure the steam discharging from the throat of the refiner against the chip flow is utilized for heating the chips in the steaming chamber, and the steam separated from the mechanical pulp is led off for use elsewhere. The steam utilized for heating the chips is conducted in complete counter-current fashion with regard to the chip flow, that is through the feed means, second lock feeder, steaming chamber, first lock feeder and reservoir under normal pressure into the open atmosphere, and the refining of the chips is carried out at a substantially higher temperature than the heating of the chips preferably not less than 135.degree..

REFERENCES:
patent: 4059237 (1977-11-01), Mannstrom
patent: 4231842 (1980-11-01), Ojala
patent: 4235665 (1980-11-01), Reinhall et al.
patent: 4289579 (1981-09-01), Forsberg

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