Derivation of performance equations for solid‐solid screens

Equations relating efficiency of separation to reject loss of desirable material have been derived for solid-solid screens. The derivations were based on the relative passage of particles through individual screen plate apertures and the extent of mixing on the feed side of the screen plate. Two limiting cases of mixing were considered: plug flow and mixed flow along the screen plate. Both barrier and probability screening were included in the analysis. The physical significance of the terms in the equations and the implications of their derivation were described in relation to wood pulp screening. Des equations correlant l'efficacite de separation a la perte par rejet de materiaux utiles, ont ete etablies pour des filtres solides-solides. Ces equations ont ete basees sur le passage relatif des particules a travers chaque ouverture du plateau du filtre et sur l'importance du melange sur le cote alimente du filtre. Deux cas de melanges limites ont ete consideres: l'ecoulement avec effet bouchon et l'ecoulement mixte le long du plateau. L'analyse inclut le filtrage par barriere et par probabilite. On decrit l'importance physique des termes dans les equations et les implications de leur etablissement par rapport au filtrage de la pǎte de bois.