落叶松纸浆纤维分级技术及应用的研究

STUDY ON THE SEPARATION OF KRAFT PULP FROM LARIX CMELINI AND ITS APPLICATION

运用６００－ＥＸ型锥形除砂器，对落叶松硫酸盐浆中早、晚材纤维进行了分离。通过正交试验运用极差分析方法，得出了影响分离效果的因素大小次序为纸浆浓度、除砂器下出口径和进浆压力；最佳操作工艺条件为纸浆浓度０．２５％～０．２２％，进浆压力０．５ＭＰａ、出渣口径为φ１０．７４ｍｍ。分级前原浆中早材纤维含量为４３．２％；分级后早材浆中早材纤维为７８．７％，晚材浆中早材纤维为７．６６％。分级前后落叶松硫酸盐浆与杨木ＣＭＰ配抄３００ｇ／ｍ￣２牛皮挂面箱板纸，分级后纸浆配抄得的纸板，外观平整光洁，耐破、环压强度得到了一定的改善，耐折强度大幅度提高，产品质量超过国家Ａ级标准。

Experiments were carried out on separation of kraft pulp from Larix gmelini by means of a 600-EX hydrocyclone to assess the efficiency of spring and autumn fibres separation in different operating con-ditions, The order of the main effective factors is as stock consistency,dimension of outlet(bottom) of thehydrocyclone and inlet pressure; the reasonable operating conditions are : stock consistency 0.25%～0.22%,inlet pressure 0.5 MPa and dimension of the outlet (bottom) 10.74 mm. The spring wood fibre ra-tio of original kraft pulp is 43.2%and that of spring fibre pulp separated 78.8%.Combining with 80%of poplar CMP and 20%of kraft pulps(before and after separation),linerboardof 300g/m￣2 was made,The quality of the products from poplar CMP and separated kraft pulps was suit orover that of the″A″grade of China national standard.