GATE (TF) Textile 2014 Question Paper Solution | GATE/2014/TF/38

Question 38 (Textile Engineering & Fibre Science)

For producing a coarse count yarn from short staple trashy cotton sliver, the most suitable rotor is

(A)Large diameter rotor with narrow groove
(B)Large diameter rotor with wide groove
(C)Small diameter rotor with narrow groove
(D)Small diameter rotor with wide groove
[Show Answer]

Option B

Frequently Asked Questions | FAQs

What is the basic principle of rotor?

The rotor in textile machinery, such as an open-end spinning machine, is a key component that plays a crucial role in the yarn formation process. The basic principle of the rotor in textiles involves the following steps:
Fiber Feeding: The fibers, usually in the form of sliver or roving, are fed into the rotor using various mechanisms such as air, centrifugal force, or mechanical means. The fibers are directed towards the rotor groove, where the yarn formation takes place.
Fiber Opening: The fibers are opened and separated within the rotor groove, creating a fiber cloud. This opening process helps to improve the individualization of fibers and prepares them for the next step.

Twisting: The rotor spins at a high speed, creating a vortex-like air flow that captures the fiber cloud and twists it into a yarn structure. The twisting action results in the formation of a continuous yarn.

Yarn Withdrawal: The formed yarn is withdrawn from the rotor groove and wound onto a bobbin or a package using a winding mechanism. The rotor continues to spin, allowing for continuous yarn production.

Yarn Tensioning: Tension is applied to the yarn during the winding process to ensure proper yarn quality and package formation. Tension can be controlled using various mechanisms such as friction discs, yarn guides, or tensioning devices.

Yarn Removal: Once the desired yarn length or package size is achieved, the yarn is cut and removed from the rotor groove, and a new cycle of fiber feeding, opening, twisting, and winding begins.

The basic principle of the rotor in textile machinery involves the opening, twisting, and winding of fibers to form continuous yarn, which is a fundamental process in textile spinning. Different rotor designs, groove geometries, and machine settings can be used to achieve specific yarn characteristics such as yarn count, twist level, and yarn strength, making the rotor an essential component in modern textile manufacturing.

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