YARN FORMING (Soota Nirmaan)

Along with a brief historical review of different methods of converting fibres into yarns, the technologies used widely at present are described. Spinning preparatory machines, ring and rotor spinning; friction, airjet, vortex, wrap spinning are all covered. Machinery features needed for adapting the basic spinning process for different natural fibres-cotton, wool, jute etc., and for manmade fibres-viscose, polyester, acrylic etc, and their blends are indicated. Principles of testing of yarns and intermediate products for quality are described.