不同级分蔗渣的制浆性能

The Pulping Performances of Various Bagasse Fractions

选用不同目数的筛网对蔗渣进行分级处理,研究了不同级分蔗渣的纤维形态及由其制得的化学浆和化机浆的性能。结果表明,随着筛网目数的增大,各级分蔗渣原料的平均纤维长度逐渐减小,纤维粗度先减小后增大;蔗渣各级分制得浆的性能存在一定差异,通过40目筛网的级分与其他各级分差别较大。对化学浆而言,保留在40目筛网以上的各个级分的卡伯值和得率相差不是太大,而40目筛网以下级分的化学浆性能很差,应尽量予以除去;对化机浆而言,通过40目筛网的级分制得浆的松厚度较其他级分大,尘埃度极高,对抗张强度和耐破度影响较大,对环压强度和挺度影响相对较小。若对纸浆白度的要求不高,可适当保留40目筛网以下的级分,以提高松厚度。无论是化学浆还是化机浆,40目筛网以上的各个级分之间的机械强度差异均不是太大。

The bagasse was classified into various fractions by screen with different meshes. The fiber morphology of various fractions,and properties of chemical and chemi-mechanical pulp were studied. The results showed that with the increase of the screen meshes,the fiber length of the fraction decreased,and the fiber coarseness of the fraction decreased firstly,then increased. The properties of pulps made from various fractions were different,especially the fraction passing through 40 mesh screen（- 40 fraction）. In terms of chemical pulping,there was no obvious difference in kappa number and yield between various fractions retained on 40 mesh screen,while the chemical pulping performance of the- 40 fraction was very poor,which should be removed as more as possible. In terms of chemi-mechanical pulping,the bulk of the- 40 fraction was higher than those of other fractions. The dirt count,tensile index and burst index of the- 40 fraction was very poor,while its ring crush and bending stiffness were slightly worse than those of others. If brightness is not important,a few parts of the- 40 fraction can be retained to increase the bulk of the pulp. There was no significant difference in strength properties between various fractions retained on 40 mesh screen of the chemical or chemi-mechanical pulp.