Yarn clearer

A yarn clearer is a device to remove faults (thick places, thin places, foreign matter) from the yarn. Yarn clearing improves the quality of the spun yarn and hence of the cloth made of it. Clear, uniform yarn is especially important for smooth operation of high-speed textile machinery. Yarn clearing is usually part of the yarn winding step. The y...
Found on http://en.wikipedia.org/wiki/Yarn_clearer
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