RELATION BETWEEN ULTRA-HIGH-YIELD ASPEN PULP PROPERTIES AND FIBER CHARACTERISTICS BY MULTIPLE LINEAR-REGRESSION

In this study we used a systematic and complete linear regression anal ysis in order to analyze a process performance and the most significan t characteristics of ultrahigh-yield aspen pulps. For this, seven stea m explosion pulps (SEP), six chemimechanical pulps (CMP), four chemith ermomechanical pulps (CTMP), two refiner mechanical pulps (RMP) and on e water explosion pulp (no chemicals) were prepared The best square re gression coefficients were obtained for the two-x model where ''x'' is the pulp density and L-factor. The second best two-x model has the su lfonate content and pulp density and the third best two-x model has th e sulfonate content and L-factor as independent variables. Steam explo sion pulps showed the highest strength properties and lowest opacity. Brightness of explosion pulps is comparable with CMPs. The SEP yield i s tower than that of CMP, CTMP and RMP but on the other hand, the refi ning energy consumption decreased and the mechanical properties improv ed more in the case of SEP. CTMPs reveal the highest brightness, while RMP reveals the highest opacity.