纸浆细小纤维的制备可以先对纸浆适当预处理，然后采用筛分仪筛分法、DD J筛分法、湿筛分法等方法进行。

After proper pretreatment, fines of pulp can be prepared by the way of Bauer-McNett classifier method, DDJ sieving method and wet-sieving method.

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通过在传统的螺旋分级机上引入湿式筛分，研制成螺旋分级筛分机。

Spiral classification-screening machine has been developed by introducing wet screening into the conventional spiral classifier.

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