Worsted

Abstract: Core yarns are known as multi-component yarns in which one component, the core material, stays nearly at the center of the yarn while the others cover it. Stretch knitted or woven fabrics can be made from core yarns in which the core is an elastomeric filament such as Dorlastan®, Lycra®, Glospan®, etc., and the covering is made from staple fibers. Elastomeric core-spun yarns are usually made on cotton, worsted, or woolen spinning systems. In this study, we briefly describe a method of producing a polyester/viscose covered Lycra core yarn on a modified short-staple ring spinning frame. We also examine the polyester/viscose staple yarn and the polyester/viscose core-spun yarns produced on the modified system. The experiment and test results show that core positioning has a direct effect on the structure, properties, and performance of these core-spun yarns.

Abstract: Recently developed by CSIRO for quality control and assurance of fabrics, FAST, or fabric assurance by simple testing, consists of a series of instruments that are in expensive, robust, and simple to use, and their related test methods. FAST is specifically designed for use by tailors and worsted finishers; it measures fabric properties that are closely related to the ease of garment making-up and the durability of worsted finishing. FAST- I gives a direct reading of fabric thickness over a range of loads with micrometer resolution. FAST-2 measures the fabric bending length and its bending rigidity. FAST- 3 measures fabric extensibility at low loads. Fabric shear rigidity is calculated from the 45° bias extensibility. FAST-4 is a quick test for measuring fabric dimensional stability, including both relaxation shrinkage and hygral expansion.