Process Flow Chart of Rotor Yarn Spinning

Commercial rotor spinning began in 1967 in Czechoslovakia. Since that time, many researchers have studied factors that affect rotor spinning of fine yarns. At the present, the break-even point, i.e., the economical count beyond which rotor spinning becomes more expensive than conventional ring spinning, is becoming ever finer, and is now approaching Ne 30 (the English system is used for yarn count). The alternative count system, tex or gram/kilometer, is given by tex X Ne = 590.6.

The purpose of this research was to study the interaction between five principal factors known to influence rotor spinning of fine cotton yarns. The factors investigated were raw material, preparation, sliver weight, count, and twist. The study was set up as a factorial design with two replications.
Rotor spinning machine
Rotor spinning process is fully different from carded or combed spinning. Rotor yarn is coarser than carded or combed yarn. The count of rotor yarn is very low. Most of rotor yarn count is below 20’s but highest yarn count may be 40’s .

The general effect of varying any one of these factors on rotor spinning is already well understood. By examining their interactions, however, it was deemed possible to acquire information on a number of other troublesome questions which are enumerated as follows:

  1. Is combing beneficial generally, or only at fine counts, or only with long-staple cottons?
  2. Is a long-staple cotton generally advantageous, or only at low twist?
  3. When a low-micronaire cotton is used, under what conditions, if any, does the higher number of fibers in the yarn cross-section offset the tendency to form neps? Is the net effect of a fine cotton a function of yarn count?
  4. To what extent is very high draft undesirable, i.e., should finer slivers be used in spinning fine yarns?
  5. Are there high-order interactions, e.g., does fine yarn call for a long combed fiber with a low sliver weight?
  6. Are the results of spinning performance consistent with those obtained by measuring yarn properties such as evenness, tenacity and appearance?
Flow Chart of Rotor Yarn Spinning

Fiber/Bale → Blow Room → Lap/Chute

Lap/Chute → Carding → Sliver (Carded)

Carded Sliver → 1st Drawing frame → Drawing Sliver

Drawing Sliver → 2nd Drawing frame → Drawing Sliver

Drawing Sliver → Rotor Spinning → Rotor Yarn




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Mazharul Islam Kiron is a textile consultant and researcher on online business promotion. He is working with one European textile machinery company as a country agent. He is also a contributor of Wikipedia.

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