Aspects of this topic are discussed in the following places at Britannica.
One popular texturizing process is false-twisting. In this technique, twist is inserted into a heated multifilament yarn running at high speed. The yarn is cooled in a highly twisted state, so that the twist geometry is set, and then the yarn is untwisted. Untwisting leaves filaments that are still highly convoluted, allowing the production of a textured yarn of much greater volume than the...
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