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

Step 1: Understanding the spinning sequence.
In conventional spinning systems, fibres pass through several stages such as carding, drawing, roving, and spinning. The roving stage is mainly used to reduce sliver thickness and insert a small amount of twist before final yarn formation.
Step 2: Concept of rotor spinning.
Rotor spinning, also known as open-end spinning, is a modern spinning method in which yarn is produced directly from sliver. The sliver is opened into individual fibres and collected in a rapidly rotating rotor where yarn formation takes place.
Step 3: Analysis of options.
(A) Ring spinning: Requires a roving stage before yarn formation and cannot spin directly from sliver.
(B) Rotor spinning: Correct — It eliminates the roving process and produces yarn directly from sliver.
(C) Mule spinning: An intermittent spinning process that uses roving as an intermediate material.
(D) Cap spinning: A modification of ring spinning that still requires roving.
Step 4: Conclusion.
Since rotor spinning directly converts sliver into yarn without the need for roving, it is the correct answer.