The end-faces of upper and lower crimping rollers not aligned resulted in clearance between side plate and end-face of crimping roller where broken fibers became black because of.

• 原因主要是上、下卷曲轮的端面不对齐,侧面板与卷曲轮端面产生间隙,间隙内的碎丝经摩擦高温作用而发黑。