Method for treating fiber suspension
AssigneeA. Ahlstrom Corporation
InventorsPasi Immonen, Ramio Kohonen
Life of this patent
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Abstract
A method of treating a fiber suspension in a disc-type pulp treatment apparatus, wherein the apparatus includes a pressure-proof casing with an inlet for the fiber suspension and a discharge for treated suspension and filtrate, a shaft rotating inside the casing an a plurality of discs arranged on the shaft, and wherein the discs are formed of sectors having filter surfaces between which surfaces is a liquid compartment communicating with the liquid discharge. The method includes feeding the fiber suspension to be treated overpressurized into the casing, filling the casing up with the fiber suspension, carrying out the treatment in a closed airless space and discharging the pulp from the casing.
Claims10
A method of treating a fiber suspension in a disc type pulp treatment apparatus comprising a pressure-proof casing having inlet means for said fiber suspension and discharge means for treated suspension and filtrate, a shaft rotating inside the casing and a plurality of discs arranged on the shaft, said discs being formed of sectors having filter surfaces, between which surfaces there is a liquid compartment communicating with the liquid discharge means, the method comprising:
- feeding the fiber suspension to be treated overpressurized into said casing;
- filling said casing up with the fiber suspension;
- carrying out the treatment in a closed airless space in three different treatment stages comprising a first treatment stage, a second treatment stage and a third treatment stage, the first treatment stage being further divided into a number of adjacent zones;
- and
- discharging the pulp from said casing.
Dependencies are inferred from the claim text.