FUNDAMENTAL-STUDY ON PULP AND PAPER TEARI NG STRENGTH .3. INFLUENCE OF CHEMICAL AND PHYSICOCHEMICAL PARAMETERS

The tear index depends not only on fibre morphology (length, weak poin t cell, thickness) but also on other chemical or physico-chemical para meters. There is no direct relation between <(DPv)over bar>, and;the t ear index in a reasonable <(DPv)over bar> range. Owing to the hydropho bic nature of the lignin, the tear index is influenced hy the amount o f lignin. It is also essentially determined by the hydration and the t ransformation of weak points into dislocation areas.