Abstract: In order to enrich the profile of vortex spun yarns, the paper introduces the development and practice of air-jet vortex polyester/viscose colored spun yarn, which further increases the added value of products. By comparing with conventional natural-colored polyester/viscose yarn, the paper elaborates on the key points of process configuration in each process of polyester/viscose colored spun yarn. After analyzing the properties of raw materials, a reasonable process scheme is selected with optimized parameters. In doing so, the ultra-black 19.7 tex air-jet vortex polyester/viscose spun yarn is successfully produced, and its quality can meet the requirements of customers, which provides a reference for developing air-jet vortex polyester/viscose colored spun yarn.

Key words: air-jet vortex spinning; polyester/viscose colored spun yarn; process scheme; flexible carding;straightening parallelism