THE COMPARISON OF STRENGTH PROPERTY BETWWEEN KRAFT PULP AND ALKALINE SULFITE-ANTHRAQUINONE PULP FOR THICKER CELL WALL FIBER MATERIALS

INTRODUCTIONMany studies on the strengths of AS-AQ pulp have been carried out. Generally speaking, except lower tear strength, other strength properties of AS-AQ pulp are similar to those of KP. Some even higher than KP1,2]. Macleod3] find that the difference in tear strength between the AS-AQ pulp and KP of aspen can be decreased about bleaching. McDonough et al4] point out that at the same beating degree, the tear strength of AS-AQ pulp is lower than that of KP, but at the …

THE COMPARISON OF STRENGTH PROPERTY BETWWEEN KRAFT PULP AND ALKALINE SULFITE-ANTHRAQUINONE PULP FOR THICKER CELL WALL FIBER MATERIALS

The comparison of strength property between kraft pulp(KP)and Alkaline Sulfite-Anthraquinone(AS-AQ)pulp for thicker cell wall fiber materials Larch and Quercus as examples was studied. The average coefficient of flexibility of Larch and Quercus are 0.6-0.7 and 0.45-0.50, respectively. The results showed that the strength property of thicker cell wall pulp is some what different from those reported earlier. The strengths of AS-AQ are all higher than those of KP for Larch and Quercus. For Larch, under same beating degree the breaking length of AS-AQ is 8-16% higher than that of KP , burst index 3-14% higher, folding endurance 30% higher, tear index slightly higher. For Quercus, the breaking length of AS-AQ is 5-10% higher then that of KP, burst index 10-15% higher, folding endurance 30-50% higher, tear index 5-15% higher. Under the same breaking length the tear index of AS-AQ pulp is significantly higher than that of KP for both Larch and Quercus.