GATE (TF) Textile 2016 Question Paper Solution | GATE/2016/TF/38

Question 38 (Textile Engineering & Fibre Science)

Consider the following assertion [a] and reason [r] and choose the correct alternative from amongst A, B, C and D.
[a] Compared to ring spun yarns, rotor spun yarns have better evenness for the same yarn count.
[r] Rotor spun yarns have more number of fibres in the yarn cross section compared to ring spun yarns of same count.

(A)[a] is right and [r] is wrong
(B)[a] is right and [r] is right
(C)[a] is wrong and [r] is wrong
(D)[a] is wrong and [r] is right
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Frequently Asked Questions | FAQs

What is the difference in ring spun and rotor spun yarns?

Ring-spun yarn and rotor-spun yarn are two different methods of producing yarn from fibers, and they differ in their characteristics and properties.
Ring-spun yarn is made by twisting and winding fibers together using a ring spinning machine. In this process, the fibers are fed through rollers to create a thin strand, which is then twisted using a spindle and a ring. The twisting action gives the yarn strength, smoothness, and uniformity, and it also creates a slightly fuzzy surface. Ring-spun yarn is typically used for high-quality fabrics such as dress shirts, suits, and fine knitwear.
Rotor-spun yarn, also known as open-end yarn or OE yarn, is made using a rotor spinning machine. In this process, the fibers are fed into a rapidly rotating rotor, which spins the fibers together and creates a yarn that is thicker and less uniform than ring-spun yarn. The resulting yarn has a more uneven texture and a slightly rougher surface, but it is also less expensive to produce and faster to spin. Rotor-spun yarn is commonly used for bulkier fabrics such as t-shirts, denim, and towels.
In summary, the main differences between ring-spun and rotor-spun yarns are:

1)Ring-spun yarn is smoother, more uniform, and higher quality than rotor-spun yarn.
2)Rotor-spun yarn is thicker, less uniform, and less expensive to produce than ring-spun yarn.
3)Ring-spun yarn is commonly used for high-quality fabrics, while rotor-spun yarn is used for more economical and bulkier fabrics.

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