Cirtical settings and their effects on the properties of open-end cover spun yarns produced by a novel system are explained. The yarns are constructed from open-end rotor spun (OER) yarns and textured polyester yarns combined within the yarn formation zone of the rotor during the open-end rotor spinning process. The end result is textured yarn wrapped as a sheath around an OER yarn core, in which the wraps per meter distribution is uniform, the yarn remains soft, and tensile propeties are better than for an equivalent OER yarn.
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