Question

The principle of yarn formation in compact spinning system is

• A. plying of yarn
• B. use of an air vortex
• C. high speed rotating spinning chamber
• D. pneumatic condensing of fibres before twisting

Hint:

Compact yarn = Less Hairiness. The pneumatic suction "tucks in" all the loose ends before they get twisted.

Answer 1

The Correct Option is D

Concept: Compact spinning is a modification of the traditional ring spinning process designed to eliminate the "spinning triangle."

Step 1: The Problem with Ring Spinning.
In conventional ring spinning, as fibers leave the front nip of the drafting rollers, they spread out. When twist is inserted, a "spinning triangle" is formed. The fibers at the edges of this triangle are often not fully integrated into the yarn body, leading to high hairiness and lower strength.

Step 2: The Compact Solution.
The compact spinning system uses a pneumatic condensing zone (usually a perforated suction drum or apron) immediately after the drafting zone. This air suction bundles the fibers together into a very narrow strand before the twist is applied. By condensing the fiber flow, the spinning triangle is virtually eliminated, resulting in a smoother, stronger, and less hairy yarn.