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Yarn count

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Yarn count

  1. 1. -By Mangesh Tonde and Sachin Nagare Post visit presentation on Veermata Jijabai Technological Institute, Mumbai Post visit presentation on Veermata Jijabai Technological Institute, Mumbai 01/08/13 1
  2. 2. Definition Count: According to the Textile Institute “Count is a number of indicating the mass per unit length or length per unit mass of yarn”. Yarn Count: is defined as the weight per unit length of the yarn or the length per unit weight. Post visit presentation on Veermata Jijabai Technological Institute, Mumbai 01/08/13 2
  3. 3. There are several count system of yarn. These count systems have been divided in two ways. One is Direct System where length is fixed and another is Indirect system where weight is fixed. Direct System Indirect system Post visit presentation on Veermata Jijabai Technological Institute, Mumbai 01/08/13 3
  4. 4.  The weight of a fixed length of yarn is determined. The weight per unit length is the yarn count. The following formula is used to calculate Direct count: N= (W×l) / L Where,  N =Yarn count, W =Weight of the sample, L=Length of the sample l=Unit of length of the sample  Post visit presentation on Veermata Jijabai Technological Institute, Mumbai 01/08/13 4
  5. 5. Post visit presentation on VeermataJijabai Technological Institute, Mumbai 01/08/13 5
  6. 6. The length of a fixed weight of yarn is measured. The length per unit weight is the yarn count. The following formula is used to calculate Indirect count: N = (L×w) / W×l Where,  N =Yarn count, W =Weight of the sample, L=Length of the sample l=Unit of length of the sample w = Unit of weight of the sample.  Post visit presentation on Veermata Jijabai Technological Institute, Mumbai 01/08/13 6
  7. 7. Post visit presentation on VeermataJijabai Technological Institute, Mumbai 01/08/13 7
  8. 8. -By Mangesh Tonde and Sachin Nagare Post visit presentation on Veermata Jijabai Technological Institute, Mumbai Post visit presentation on Veermata Jijabai Technological Institute, Mumbai 01/08/13 8
  9. 9.  The amount of twist is an important factor. It determines the appearance as well as the durability and serviceability of a resulting fabric Fine yarns require more twist than coarse yarns. Warp yarns, which are used for the lengthwise threads in woven fabrics, are given more twist than are filling yarns, which are used for the crosswise threads. Post visit presentation on Veermata Jijabai Technological Institute, Mumbai 01/08/13 9
  10. 10.  To retain the twist in the yarns and prevent any tendency to untwist or kink, the yarns are given a twist-setting finish with heat or moisture The direction of twist may be observed by holding the yarn in a vertical position. If the spirals conform to the direction of the slope of the central part of the letter S, the yarn has an S twist; if they conform to the slope of the letter Z, the yarn has a Z twist. Post visit presentation on Veermata Jijabai Technological Institute, Mumbai 01/08/13 10
  11. 11. Post visit presentation on VeermataJijabai Technological Institute, Mumbai 01/08/13 11
  12. 12. The physical properties suchas smoothness comes overyarn after twisting andremoves loose filaments also Post visit presentation on Veermata Jijabai Technological Institute, Mumbai 01/08/13 12
  13. 13. Post visit presentation on VeermataJijabai Technological Institute, Mumbai 01/08/13 13
  14. 14.  The number of twists per inch can, in PILED yarns, be determined by counting the number of bumps in one inch, and divide by the number of singles for example, In this yarn the number of twists per inch would be 6 divided by 2 that is 3 Post visit presentation on Veermata Jijabai Technological Institute, Mumbai 01/08/13 14
  15. 15.  The term count variation is generally used to express variation in the weight of a lea and this is expressed as C.V.%. The number of samples and the length being considered for count checking affects this Post visit presentation on Veermata Jijabai Technological Institute, Mumbai 01/08/13 15
  16. 16. THANK YOU. Post visit presentation on Veermata Jijabai Technological Institute, Mumbai 01/08/13 16

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