Pulp fractionation by fibre characteristics

摘要

The separation of pulp fibres in various fractionating devices was examined. It is shown that mechanical barrier fractionators (conventional screens, Celleco and Float-Wash) separate fibres according to fibre length and flexibility, independently of the type of pulp used. Hydrody-namic separators behave differently. The liquid plug fractionator (Axel-Johnson) separates fibres ac- cording to their length, the atomizer according to their diameter, and the hydrocyclone according to specific surface and density. A fractionation index which treats the pulp as a continuum and it is based on the average properties of the fibres in the pulp streams was developed and used to assess the efficiency of the various fractionators.