Question

Which one is correct regarding pilling resistance?

• A. Air vortex yarn > Ring yarn > Open end yarn
• B. Air vortex yarn < Ring yarn < Open end yarn
• C. Air vortex yarn > Open end yarn > Ring yarn
• D. Air vortex yarn < Open end yarn < Ring yarn

Hint:

Lower yarn hairiness generally leads to higher pilling resistance. Air vortex yarns are preferred where superior surface appearance is required.

Answer 1

The Correct Option is C

Step 1: Understanding pilling resistance.
Pilling resistance refers to the ability of a yarn or fabric to resist the formation of pills on the surface due to abrasion during use. Yarns with better fibre binding and fewer protruding fibres show higher pilling resistance.
Step 2: Characteristics of different yarns.
Air vortex yarn: Fibres are tightly wrapped around a straight core, resulting in minimal hairiness and excellent fibre binding. This provides the highest resistance to pilling.
Open end yarn: Has wrapper fibres and moderate hairiness, offering better pilling resistance than ring yarn but lower than air vortex yarn.
Ring yarn: Has higher fibre hairiness due to twisting, which increases the tendency of fibres to protrude and form pills.
Step 3: Comparing pilling resistance.
Based on fibre structure and hairiness:
\[ \text{Air vortex yarn}>\text{Open end yarn}>\text{Ring yarn} \] Step 4: Conclusion.
Thus, the correct order of pilling resistance is Air vortex yarn > Open end yarn > Ring yarn.

Answer 2

Rather than describing each yarn type from first principles, this can be settled by making three direct pairwise comparisons and chaining the results together.

1. Air vortex vs Ring: Air vortex yarn wraps fibres tightly and helically around a straight, low-hairiness core using the vortex airflow, leaving very few loose fibre ends able to protrude and tangle into pills. Ring yarn, formed by real twist insertion through a traveller, inherently leaves many protruding fibre ends (hairiness) that easily entangle with neighbouring loose ends to form pills. So air vortex clearly outperforms ring yarn in pilling resistance.
2. Open end vs Ring: Open-end (rotor) yarn has a distinctive wrapper-fibre structure where some fibres wind around the yarn body, giving a bulkier, somewhat more compact structure with fewer freely protruding fibre tips compared to the finer, more hairy surface typical of ring-spun yarn. This gives open-end yarn an edge over ring yarn in pilling resistance as well.
3. Air vortex vs Open end: Comparing the two non-ring options, air vortex yarn's fibre-wrapping mechanism produces an even lower-hairiness, more compact surface than open-end yarn's wrapper-fibre structure, since air-vortex spinning is specifically engineered to minimize protruding fibre ends. So air vortex still edges out open-end yarn.

Chaining these three pairwise results together: air vortex outperforms open-end, and open-end outperforms ring, giving the overall order Air vortex > Open end > Ring.

Therefore, the correct answer is Air vortex yarn > Open end yarn > Ring yarn.