Influence of cooking variables of Crimean Pine (pinus nigra arnold SBSP. pallassiana) kraft pulp on the resulting paper Sheets

Abstract

A central composite factorial design was used to examine the influence of independent variables of kraft pulping of Crimean Pine wood chips at 50 Schopper-Riegler (oSR) level. Second order polynomial regression equations related each dependent variable to the different independent variables were obtained that reproduced the experimental results for the PFI beating revolutions, breaking length, burst index, tear index, stretch and brightness at 50 oSR obtained at sulphidity, H-factor and active alkali rates over the ranges 15-45%, 800-2400 and 14-22% respectively, with average errors less than %20. To minimize environmental effects of sulphide and acceptable levels of the properties of the paper sheets, low sulphidity rate, high H-factor and medium alkali concentration can be used.