A MECHANISTIC MODEL FOR PREDICTING PULP PROPERTIES FROM REFINER OPERATING-CONDITIONS

A mathematical model for a refining process is presented. The model pr edicts pulp properties (freeness, long-fiber content, and shive conten t) and handsheet properties (burst index, tensile index, tear index, a nd light-scattering coefficient) based on refiner operating conditions and process disturbances. The operating conditions include transfer-s crew speed (production rate), refiner closing pressure (specific energ y), and dilution flow rate (consistency). The process disturbances inc lude variations in chip bulk density and moisture content. The model a lso considers the effects of refining intensity and refining power on pulp and handsheet properties.