1. Types of Yarns and Spinning For TP-1 By Engr. Muhammad Irfan Siyal

2. Types of yarns Staple fiber yarnFilament yarn 0 Short staple Spinning 0 Open end yarn, 0 Ring spun yarn. 0 Long Staple Spinning 0 Woolen and Worsted yarns 0 Single filament 0 Multifilament

3. Yarn types

4. Yarns are classed based on fiber length and method of processing

5. Principle of Rotor Spinning 0 Sliver is fed into the machine and combed and individualized by the opening roller. 0 The fibers are then deposited into the rotor where air current and centrifugal force deposits them along the groove of the rotor where they are evenly distributed. 0 The fibers are twisted together by the spinning action of the rotor, and the yarn is continuously drawn from the centre of the rotor. 0 The resultant yarn is wound onto packages.

6. Advantages of Rotor Spinning 0 The production rates of rotor spinning is 5-7 times higher than that of ring spinning and as the machines are fed directly by sliver and yarn is wound onto packages ready for use in fabric formation the yarn is a lot cheaper to produce. 0 Rotor spun yarns are more even, somewhat weaker and has a harsher feel than ring spun yarns. 0 Rotor yarns are used in numerous products such as denim, towels, blankets socks, t-shirts, shirts and pants.

7. Principle of Rotor Spinning

8. Ring Spinning 0 Ring spinning is the process of further drawing out roving to the final count needed, inserting twist to the fibers by means of a rotating spindle and winding the yarn on a bobbin. 0 These three stages take place simultaneously and continuously. 0 Ring spinning is a comparatively expensive process because of its slower production speeds and the additional processes required for producing ring spun yarns.

9. Ring Spinning

10. Filament formation 0 A spinning process produces the fiber by passing the thick liquid through a spinneret. 0 A spinneret is a device with hundreds of holes of a specified diameter. 0 The liquid is forced through the spinneret holes and comes out a string liquid filament. 0 The hole in the spinneret determines the diameter of the filament, which is set by the application.

11. Filament formation 0 The extrusion is dried to a continuous filament fiber. 0 A twisting process twists the filament fiber into a yarn. 0 The filament falls vertically from the spinneret and is caught in a large vacuum nozzle. 0 The vacuum force keeps tension on the line as it is wound around a bobbin.

12. References 0 http://www.thecottoncompany.com/news/yarn_form ation.html 0 http://www.globalspec.com/learnmore/materials_ch emicals_adhesives/composites_textiles_reinforcement s/synthetic_fibers_fabrics_polymer_textiles 0 http://textechdip.wordpress.com/contents/yarn- spinning/