Defect free yarn is a great demand for spinner, knitter, and weaver and also other textile personnel because numerous end products from knit apparels to woven fabrics, from towels to sheets and from carpets to industrial fabrics characteristics significantly depend on the physical properties of yarn. The qualities of rotor yarn are really directed by spinning parameters. The aim of this study is to observe the effect of spinning parameters such as rotor diameter and speed on thick, thin places and neps of yarn in rotor spinning process. 0.11 sliver hank of 100% cotton was used to produce 12 Ne yarn. 65% virgin cotton and 35% wastage cotton were mixed together. The positive impact of spinning parameters on yarn properties were accessed by thick places, thin places and neps. Results indicate that the yarn qualities were improved with increasing of rotor speed and rotor diameter. The rotor diameter was settled to 43 mm while rotor speed fluctuated from 35,000 to 45,000 rpm and rotor speed was fixed to 35,000 rpm while rotor diameter across contrasts from 43 mm to 66 mm.
Rotor spinning is considered as most suitable and successful spinning process among many open-end spinning methods [
Rotor spinning gives a new era to produce more uniform, fuller, aerated and regular in strength of cotton yarn [
Rotor spinning is a recognized spinning system mainly for medium and course counts. The yarn characteristics of rotor spun yarn are affected by many factors related to raw material, machine parameters and processing parameters also.
Many researchers have already investigated the effect of rotor and carding parameters on yarn quality from different outlooks [
The main object of this work is to produce better quality yarn. In this study, the effect of rotor speed from 35,000 to 45,000 rpm and rotor diameter from 43 to 66 mm on 100% cotton yarn properties in terms of thick, thin places and neps were systematically investigated. The quality cotton yarn was produce by using rotor spinning system that can be used for weaving and knitting fabrics. In order to authenticate this work, yarns were spun at three selected rotor speeds (i.e. 35,000, 40,000 and 45,000 rpm) and three rotor diameter (i.e. 43, 54 and 66 mm). Rotor diameter was unchanged to 43 mm while yarns were spun with speed variation. Similarly, rotor speed was fixed to 35,000 rpm whereas yarns were spun with diameter variation.
The slivers of 0.11 hanks were collected from Akij Spinning Mills Limited, manikgonj, Bangladesh. The sliver was produced from 65% virgin cotton and 35% wastage. The wastage were composed of 10% droppings 1, 10% droppings 2, 10% noil and 5% pneumafil.
BD 200RN, Elitex, Czech Republic type rotor spinning machine was used in this experiment to produce yarn. Various types of yarns were produced based on different variables. Rotor speed changed from 35,000 to 45,000 rpm at constant rotor diameter of 43 mm and rotor diameter raised from 43 mm to 66 mm at constant rotor speed of 35,000 rpm. Firstly, drawn slivers were feed through a sliver guide via a feed roller and feed plate to rapidly rotating opening roller. The rotating teeth of the opening roller comb out the separate fibers from the sliver clamped between feed plate and feed roller. Then the fibers were feed to inside wall of the rotor after completing action in transport channel. The fibres moved forward to the rotor groove from the conical rotor wall by centrifugal forces in the rapidly rotating rotor. Finally, the yarn formed in the rotor is continuously taken off by the delivery shaft and the pressure roller through the nozzle and the draw off tube and wound onto a cross wound package [
Quality parameters | Value |
---|---|
Spinning Consistency Index | 138 |
Micronaire (µg/inch) | 3.00 |
Uniformity Index (%) | 80.0 |
Short Fibre Index (%) | 8.2 |
Length(mm) | 28.00 |
Strength (g/tex) | 30.4 |
Elongation (%) | 6.0 |
Maturity Index | 0.87 |
Moisture (%) | 7.1 |
Uster Tester-5 was used to determine the thick places, thin places and neps of the yarn at a speed of 450 m/min. The sensitivity setting was −50% for thin places, +50% for thick places and +280% for neps. Thin places indicate the mass reductions, thick places indicate the mass increase and neps indicates the increase of short mass. Average of ten tests was taken for final result at each trial. All experiments were performed at temperature 20˚C ± 2˚C and relative humidity 65% ± 2% [
Rotor spinning is a very fast rising spinning technique for the production of coarse and medium count yarns. This is so because of its higher productivity, better product quality and profitability. Considering such factors the present research work was initiated to study the effect of rotor speed and rotor diameter upon the yarn quality. Yarn faults in the shape of thin, thick places and neps on the external appearance of yarns and the obtained products are decisive to minimize. The resultant data presented in different figures is discussed here.
The
diameter on thick places of the yarn respectively. The rotor speed and rotor diameter has positive effect on yarn thick places. The effect of rotor speed on yarn thick places was studied at constant rotor diameter of 43 mm and effect of rotor diameter was checked at constant rotor speed of 35,000 rpm. Thick places were decreased with the increment of rotor speed and rotor diameter. Concerning thick places, the order of samples were found as like 35,000 > 40,000 > 45,000 for rotor speed and 54 mm > 43 mm > 66 mm for rotor diameter. In case of speed variation, the thick places were decreased 51.53% and 66.08% respectively for the samples produced from the rotor speed of 40,000 rpm and 45,000 rpm as compared to the sample from 35,000 rpm. It has been also found that at rotor diameter variation, the thick places were increased 16.45% and decreased 63.61% respectively for the samples produced from the rotor diameter 54 mm and 66 mm compared to the sample produced from 43 mm.
The analyzed data on thin places of yarn for rotor speed and rotor diameter were shown in
were found as 35,000 rpm > 40,000 rpm > 45,000 rpm for rotor speed variation and 54 mm > 43 mm > 66 mm for rotor diameter variation respectively. The thin places were decreased 14.54% and 41.82% for the samples produced from the rotor speed of 40,000 rpm and 45,000 rpm as compared to the sample from 35,000 rpm. It has been also found that at rotor diameter variation, the thin places were decreased 34.55% for the samples produced from rotor diameter 66 mm compared to the sample produced from 43 mm. Oppositely, the values was increased 72.73% for for the samples produced from rotor diameter 54 mm. The result revealed that 9.5 was the highest value of yarn thin places.
of 43 mm. It was also found that the neps were 15.14% decreased for the sample produced from 66 mm rotor diameter and 30.55% increased for the sample produced from 54 mm compared to the sample of 43 mm rotor diameter at constant rotor speed 35,000 rpm. The highest neps were recorded for the yarn of 54 mm rotor diameter.
Rotor-spun yarns have established firmly in fields of application for woven and knitted fabrics. Rotor-spun yarns could be utilized effectively where the particular properties of the rotor-spun yarns corresponded particularly closely to the requirements of the end products. Terry products and upholstery fabrics are the main applications for rotor-spun yarns in the home textiles sector. Also worth mentioning as end products using rotor spun yarns are socks and sweaters in the clothing sector, sheets and upholstery fabrics in the home textile sector, as well as technical textiles.
Noteworthy effect of rotor speed and rotor diameter on the yarn thick, thin places and neps in rotor spinning was studied. At constant rotor diameter of 43 mm, the yarn qualities were improved i.e. thick, thin places and neps were decreased with increase of rotor speed from 35,000 to 45,000 rpm. Conversely, analogous scenario observed due to augmentation of rotor diameter from 43 to 66 mm at constant rotor speed of 35,000 rpm. The yarn quality tends to deteriorate i.e. thick, thin places and neps were increased when the rotor diameter increases from 43 to 54 mm. Further work could be done on producing quality yarn of various counts from other natural, synthetic and blends fibres to justify this analysis. It also could be checked by changing others spinning parameters.
Repon, Md.R., Al Mamun, R., Reza, S., Das, M.K. and Islam, T. (2016) Effect of Spinning Parameters on Thick, Thin Places and Neps of Rotor Spun Yarn. Journal of Textile Science and Technology, 2, 47-55. http://dx.doi.org/10.4236/jtst.2016.23007