新闻纸厂树脂及其钙皂沉积性能的研究(英文)

THE CHARACTERISTICS OF THE PITCH AND THEIR CALCIUM SOAPS DEPOSITION IN NEWSPRINT PAPER MILL

利用塔罗油作为新闻纸厂浆水体系中树脂的模型物,分别在有纤维和无纤维存在下研究了钙皂对树脂沉积的影响。结果表明,钙皂的形成是导致树脂沉积的一个重要原因。树脂沉积不但与钙皂的多少有关,而且还与钙皂的分散程度有关。当体系中无纤维存在时,随着pH值的降低,树脂沉积减少,但是当浆浓为0.8%时则得到相反的结果。纸浆通过影响到钙皂粒子的生成过程来影响树脂沉积。与漂白化学浆相比,加入含有更多细小组分的化学热磨机械浆后产生更少的树脂沉积,对于同一种纸浆,打浆度越高,树脂沉积越少。

Tall oil was used as a model compound of the pitch in the pulp suspension to study the effects of calcium soaps on the pitch deposition with and without fibers. The results showed that the formation of calcium soaps was an important cause that led to the pitch deposition. The pitch deposition was not only related to the amount of the calcium soaps but also the dispersion of the calcium soaps. The pitch deposition decreased with the decrease of pH when there were no fibers in the system, but the opposite results were obtained when the pulp consistency was 0.8%. The pulp could affect the forming process of calcium soaps particles and reduce the pitch deposition. The less deposition was obtained in the presence of chemithermomechanical pulp(CTMP) which contained more fines compared to the bleached chemical pulp. As for the same kind pulp, the higher the beating degree was, the less the pitch deposition.