Question

Which spinning system produces yarn directly from sliver without roving?

• A. Ring spinning
• B. Rotor spinning
• C. Mule spinning
• D. Cap spinning

Hint:

Rotor spinning increases productivity by eliminating the roving stage and is widely used for coarse yarn production.

Answer 1

The Correct Option is B

To determine which spinning system produces yarn directly from sliver without the need for roving, we need to understand the characteristics and processes involved in different spinning systems:

1. Ring Spinning: This is one of the most common spinning systems used for producing yarns. In this system, the transformation from sliver to yarn involves an intermediate step called roving. The sliver is first converted into roving before the final yarn is produced. Therefore, ring spinning does not produce yarn directly from sliver.
2. Rotor Spinning: Also known as open-end spinning, this system directly produces yarn from sliver without the intermediate roving stage. Sliver is fed into the rotor, and yarn comes out directly, making it an efficient and faster process compared to other spinning systems.
3. Mule Spinning: This is a traditional spinning technique that involves several steps, including the conversion of sliver to roving before producing yarn. Hence, it is not directly producing yarn from sliver.
4. Cap Spinning: Similar to mule and ring spinning, cap spinning involves intermediate processes and does not directly convert sliver into yarn.

After examining the characteristics of each system, it is clear that Rotor Spinning is the only system that produces yarn directly from sliver without the intermediate roving step. This provides a quicker and often more economical method of yarn production.

Thus, the correct answer is Rotor Spinning.