Effect of the Type of Fibers and Their Properties on Yarn Hairiness on Ring Spun Yarn
Oxford Amalgated PLC, Ethiopia
Oxford Amalgated PLC, Ethiopia
Yarn hairiness is the amount of fibers protruding from the yarn body measured in terms of its length and number of fibers. Now a days hairiness plays a vital role in accessing the yarn quality as it heavily influences the quality of the fabric produced from the spun yarn in knitting as well as weaving. The essential fabric properties of pilling resistance and abrasion resistance are affected by the yarn hairiness. Also the performance of Warping machine, Sizing machine, high speed knitting and high speed weaving machines are also affected by the yarn hairiness.
Hairiness is measured in two methods.
A. Hairiness Index (H): USTER introduced this method of testing. It is the value represents the total length in CMs of the protruding fibers in 1 CM length of yarn.
B. Hairiness Index (S3): ZWEIGLE counts the number of protruding fibers of different lengths separately. S3 value is the sum of the number of fibers of 3 mm and longer length of protruding fibers.
Hairiness is widely influenced by fiber properties, process parameters, spindle speed, traveller selection, machinery conditions, Relative humidity and amount of twist. But in this article we are discussing about the fiber properties. They are,
- Torsional rigidity
- Fiber length
- Fiber fineness
- Short fiber content
- Fiber cross section / shape
It is the ratio of the torque applied about the central axis of the yarn at one end of the yarn to the resulting torsional angle, when the other end is held fixed. On other hand, it is the resistance of the textile fiber or yarn against twisting. The torsional rigidity of the cotton fibers are very much depends on their fiber fineness. It is very sensitive to the Relative humidity.
This is the prime property which affects the hairiness of yarn. The fibers with higher Torsional rigidity have higher yarn hairiness and vice versa.
2. Fiber length
The yarn hairiness reduces with increase in fiber length. The reason is the reduction in number of fiber ends protruding from the yarn surface resulting in less hairiness. While using longer fibers, the fibers tend to overlap on the yarn surface in a better manner and hence improve the compactness of yarn which results less hairiness.
3. Fiber fineness
The yarn hairiness is less for finer fiber and higher for coarser fiber. The torsional rigidity is the most essential property of the fibers contributes to the formation of hairiness. Generally the finer fiber will have less torsional rigidity and hence the hairiness will be less. The coarser fiber has higher torsional rigidity and higher hairiness in yarn. When the yarn delivering to the front roller nip and while twist insertion, the higher centrifugal force acting upon the coarser fiber leads to higher hairiness.
4. Short fiber content
SFC has positive correlation with the yarn Hairiness. Increase in SFC will increase yarn hairiness and vice versa. The increase in number of protruding ends in yarn surface due to shorter fiber length leads to increase the yarn hairiness.
5. Uniformity Ratio
As the increase in Uniformity ratio improves the mean fiber length and hence this property having a negative correlation with yarn Hairiness.
6. Fiber cross section / Shape
Comparing the circular and non-circular cross sectional fibers, the yarn hairiness is less with the yarn spun with circular cross sectional fibers. The compactness of fibers while using circular cross section fibers is better than that of other and hence the hairiness is less with circular cross section fibers.
But the impact of twist on hairiness in non- circular cross section fibers is better than circular cross section fibers. Higher the twist will reduce the Hairiness to more extent in non- circular cross sectional fibers.
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