精练 (jīng liàn): (สิ่งทอ) เพื่อล้าง

In the textile factory, workers use chemicals to scour the cotton fabric, removing natural waxes and impurities so that the fabric can be dyed better.

Before silk is woven into fabric, it must go through a scouring process to clean off sericin and oils; otherwise, the texture will be rough.

This dyeing and printing factory recently improved its scouring technique by using biological enzymes instead of strong alkali, which not only reduced pollution but also caused less damage to the wool fibers.