SODA-ANTHRAQUINONE PULPING OF TREMA ORIENTALIS

摘要

Trema orientalis is one of the fastest growing woods in the world. Its chemical and morphological properties were studied. The a-cellulose, pentosan and Klason lignin in T. orientalis were about 50, 22 and 22%, respectively. Soda-anthraquinone (AQ) pulping of T. orientalis was also studied with varying active alkali and cooking time. The screened pulp yield was increased and total pulp yield & kappa number were decreased with increasing active alkali or cooking time. At 17 % active alkali in 120 min of cooking at 170°C, T. orientalis produced screened pulp yield of 49.9% with 1% reject in kappa number 21. The strength properties were comparable to gamar wood pulp, which is an important fibrous raw material of Bangladesh. At 40 °SR, the breaking length, burst index and tear index of Trema orientalis wood pulp were about 6000 m, 4.6 kPa · m~2 /g and 7.0 mN · m~2/g, respectively.