12 February 2013
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?
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
↓
Winding
↓
Reeling
↓
Bundling
↓
Bailing
↓
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
↓
Winding
↓
Reeling
↓
Bundling
↓
Bailing
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Another name of rotor spinning is OE (Open Ended). Now rotor spinning is very popular due to less time consuming than ring spinning and higher production rate. Now it is frequently used to make denim and heavy fabrics as well. Due to denim making from this fabric it turns to highest level of use among all the spinning processes in case of woven garments.
ReplyDeleteRotor spinning is now popular for denim where coarser yarns are to be weaved.
ReplyDelete