refined heavy base

Apply steam to heat the flushing-liquor decanter indirectly to soften the heavy tar depositing on the bottom of tank to decrease the drag of chain scraper.

用蒸汽在机械化澄清槽底部间接加热，使沉积于底部的重质焦油软化，减少刮板阻力。

Traditional alkali scouring can be substituted by enzyme-based treatment.

一般而言,酶精练能够代替碱精练。