Abstract
The fiber characteristics (fiber length, specific surface area, etc.) of alkaline sulfite chemithermomechanical pulp (Na2SO3+NaOH-CTMP) obtained from Giant Leucaena wood were measured and compared with those of thermomechanical pulp (TMP) and chemithermomechanical pulp (Na2SO3-CTMP).The weighted average fiber length of Na2SO3+NaOH-CTMP was 0.75mm, which was longer than those of TMP (0.53mm) and Na2SO3-CTMP (0.55mm).The specific surface area increased in the order TMP (4.5m2/g)<Na2SO3-CTMP (5.2m2/g)<Na2SO3+NaOH-CTMP (7.8m2/g). The large surface area of Na2SO3+NaOH-CTMP can be ascribed to the formation of fibrils and films-like particles on the fiber surface. The degree of internal fibrillation was higher in Na2SO3+NaOH-CTMP than in TMP or in Na2SO3-CTMP.The high sheet strength of Na2SO3+NaOH-CTMP can be explained on the basis of the development of internal and external fibrillation by the addition of NaOH.
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