what is the limitation of rotor yarn?

Ring spinning has various advantages besides disadvantages.It is the most flexible system from the viewpoints of fibers which can be used and the extent of the yarn counts which can be produced. Ans: Evenness of yarn is increased by means of back doubling 5. There can be variation twist.,bulk, strength, elongation , fineness etc. The open end yarn poses good abrasion resistance. This is the special character of open-end yarn getting produced in rotor spinning. Now-a-days spinners are trying to finding out various alternative spinning systems among which only rotor and air-jet has established market value. Ring spinning definition, a process of spinning in which the yarn is twisted and drawn while passing through a small metal device traveling rapidly around a ring in the operation of winding the yarn onto a bobbin. How evenness is improved in the rotor yarn? Rotor spun yarns from recycled cotton spinning wastes were manufactured by means of rotor spinning process and tested for yarn imperfections and strength.Results of studies are examined the effect of cleaning intensity,cylinder speed and combing roller speed of rotor frame by using box and behnken experimental design. It has been demonstrated that DREF-2 friction spun yarns possess only 60% of the tenacity of ring spun yarns and about 90% of that of rotor spun yarn. Single friction spun yarn exhibits lower tenacity, higher snarling tendency, and poorer performance than other yarns during weaving or knitting. The structure and properties of Murata vortex spun yarns are investigated and compared with ring and open-end rotor spun yarns. 2. A yarn withdrawal nozzle 13 for an open-end rotor spinning device 1 with at least two ferromagnetic projections for magnetically coupling to permanent magnets 31 arranged in depressions of a holder in the cover element 8 of a rotor housing 2, wherein the ferromagnetic projections correspond in their arrangement and dimensions to the depressions 30 in the holder. The count rang of friction spun yarn is narrow and limited (42 - 591 Tex). Ring, Rotor and Air-jet spinning systems provide yarn with different structures… It is also a fast process. Although ring spinning is the universal spinning system but main limitation of this system is its limited spindle speed which causes lower production rate. Observing the value of co-efficent of determination,it can be said that … These yarns are usually manufactured from the comber waste and flat waste of card.but then also OE yarns are more even than rotor yarn. Ans: a. Spinning of fine count yarns. Rotor spinning, also known as open-end spinning, was developed in the 1970s and early 1980s. relative to ring-spun yarn are smaller than for countrelated yarn tenacity [12-14]. It is very much important in this time because although ring spinning machine produces best quality yarn but some limitations specially limited productivity bounds the spinners to choose alternative spinning system. Two most widely used yarns called Open End & Ring Spun. Open end yarn is produced using Auto Coro (rotor) machines. 1. Abstract. End uses include denim, towels, blankets socks, t-shirts, shirts and pants. The other important textile aspect of fibre diameter, its effect on the spinning limit of yarns, will be discussed in the next lecture. “Jem” and yarn twist characterized e.g. The spinning limit is described as the finest yam count with acceptable qualities ... Mass CV%, thin places, thick places and neps of the TF yarn were less than that of the conventional rotor yarn. But limitation of rotor yarn is less strength of the produced yarn. The yarn twist for the ring spun yarn emerged as an influential factor on the number of thick places in ring spinning because fibers are assembled together into a twisted strand to constitute a yarn. yarn is formed. Rotor spun yarns are mainly produced in the medium count (30 Ne, 20 Tex) to coarse count (10 Ne, 60 Tex) range. Introduction Assessment of the yarn quality is still based on the off-line technique Now-a-days spinners are trying to finding out various alternative spinning systems among which only rotor and air-jet has established market value. Advancements through the compact spinning and how it lacks from the rotor spinning, is the main purpose behind this work. Heavier traveller up to a limit reduces hairiness(40} because of improved flow of twist to front roller nip. Rotor yarn comprised 15%lessfibres inyarn cross-section than the corresponding ring yarn. Cotton yarns are spun from the same lot of Australian raw cotton fibers using the Murata vortex, ring, and open-end rotor spinning methods. Rotor yarns have about 20% lower hairiness than ring yarnsl8OJ. The rotor spinning system is particularly advantageous in the coarse and medium count range, which will have limitation in the only property, strength. Ring, Rotor and Air-jet spinning systems provide yarn with different structures and properties. This can be rectified by the core spinning. 3. Nowadays, the properties of its final product—yarn—such as yarn strength and yarn twist, are not satisfied due to the fiber morphology, which greatly depends on the distribution of the massive fibers in the rotor spinning unit (RSU). Rotor spun yarns are more even, somewhat weaker and have a harsher feel than ring spun yarns. Fig. From these parameters the structural characteristics as packing density, orientation and mean surface helix angle can be computed. Textile yarns can be classified according to spinning systems like the ring, compact, rotor, air-jet, friction, and spun yarn. Rotor Spinning. 21.4 Fibre length and strength While fibre diameter is the most important characteristic in fine wools, fibre length is of equal importance in coarser wools. Key words: yarn, ring- spinning, rotor– spinning, consistency, surface integrity. We have produced 20's Ne, 100 % cotton yarn from the above systems and their properties are tested by UT5 and lea strength tester. The open end yarn also contains a thin outer layer of fibers with hardly any twist or even with twist in the reverse direction. Rotor yarn exhibits the properties of high extensibility and elasticity, good abrasion resistance and good insulation properties. With the new CHANNEL pass, it is additionally more flexible. In the process of yarn twisting, more fibers in the cross-section result in a higher resistance to torsion leading to the formation of thick places in the yarn. See more. The system spins yarn directly from slivers, using a spinning rotor and a withdrawal system that imparts false twist to form the fibers into a yarn. Strength of yarn is less due to less migration of fibres b. Finer count is not possible 4. According to statistical analysis the spun yarns and open-end rotor spun yarns … by Phrix twist coefficient “alf”. But at the same time, the limitations faced by the rotor spinning include the requirement of finer and shorter fiber. Advantages: Production of high strength yarns. Yarn evenness deals with the variation in yarn fineness. The improved ergonomic design makes operation even easier and more time-saving. Proper for special yarns. In textile there are many ways to spun the yarn. The ring spinning system is the oldest spinning system that remains dominant because of the high-quality yarns it produces. Low values of stress-strain show up the limitation in the spinning of fine counts on a rotor-spinning machine. The new S 66 spin box is the heart of the R 66 rotor spinning machine and the core of innovations. INTRODUCTION: Non-uniformity in variety of properties exists in yarns. What is the limitation of rotor yarn? So it is very important for spinners to find out a suitable one according to end use and others economic aspects. Each system has its advantages and limitations in terms of technical feasibility and economic viability. elongation of rotor spun yarns is about 78% of that of ring spun yarns. The Purpose of Blending. How to calculate back doubling? As with the conventional methods employed on rotor spinning machines in the production of fancy yarns, the pressurized air method also has its own limitations. Further developed from the S 60 box, it allows higher yarn tenacity and better yarn evenness. evaluate yarn quality and to prevent misunderstandings that can result in wrong decisions in knitting. The open end yarn consists of wrapped fibres around the yarn surface. Raw materials used in the spinning mill are always inhomogeneous in their characteristics, owing to different cultivation conditions of natural fibers and the different conditions for synthetic fiber materials. Limitations. Comparison of the advantages and the disadvantages of the ring spinning systems. Rotor is the cheapest technique and produced yarn evenness is also better than ring yarn. Rotor spinning is an open-end spinning method that uses air as the medium to transform the fibers into yarn. ring, rotor and air-jet spun yarn”. Ring spinning is a universal system, although it has some limitations like small yarn package size, limited spindle speed, traveler speed, ballooning, and the spinning triangle resulting in higher cost and less productivity [ 7 Thisis the property, commonly measured as the variation in mass per unit length along the yarn, is a basic and important one, since it can influence… Rotor yarn has a lower maximum tensile load than a ring-spun yarn [19]. Rotor yarn of coarser count is used for denim fabric and tends to show a starting mark due to the creep behavior of yarn [36]. The ring spinning system is the most flexible system from the viewpoints of fibres which can be used and the extent of the yarn counts which can be produced. While the conventional methods can only produce effect lengths longer than the rotor circumference, the pressurized air method can only produce effect length shorter than the rotor circumference. Disadvantage of rotor spinning is - it's spinning limit ( finer yarns than 40s count can't be spun. The yarn is a lot cheaper to produce. There are different methods of open end yarn manufacturing such as rotor spinning, Airjet spinning etc. 2: Comparative results of yarn breaking elongation C. Yarn Evenness The experimental results regarding yarn evenness are shown in Table-3 and Fig. It has also shown that friction spun yarn generally has *60 - 70% strength, *60 - 90% unevenness, *100 - 140% bulk and *requires 75 - 100% of the minimum no of fibres in the cross section as compared with the corresponding ring spun yarn. Bulkier and softer handle than that of ring and rotor spun yarn. Fewer fibres in ~arn cross-section in rotor yarn result in lesser yarn strength. NPTEL provides E-learning through online Web and Video courses various streams. 3. OE type means Open End Yarn. It is a special type of project work as it is an observing and analytical work.

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