METHOD OF AND DEVICE FOR FRACTIONATING SUSPENSIONS

摘要

In a method of fractionating suspensions, preferably containing fibre pulp, the suspension to be fractionated is sprayed in the form of at least one jet against one side of a filter sheet during displacement of the filter sheet and said jet of suspension relative to each other, so that the suspension is separated into a fine fraction, which passes through the screen holes of the filter sheet and which contains fine particles, and a coarse fraction, which does not pass through said screen holes and which contains coarse particles and some fine particles. According to the invention cleansing liquid in the form of at least one jet is sprayed against the filter sheet, the filter sheet and said jet of cleansing liquid being displaced relative to each other such that the jet of the cleansing liquid hits the screen holes of the filter sheet which have been sprayed with suspension. The invention also relates to a device for such a fractionation of suspensions,