Top Textile Yarn Questions and answers for 2025

  Here are the top textile yarn questions and answers for 2025, compiled from industry interviews, exams, and technical resources:

1. What is Yarn?

Yarn is a continuous strand of twisted or spun fibers (natural or synthetic) used in weaving, knitting, or sewing. It can be made from cotton, wool, polyester, silk, or blends 14.

2. Difference Between Yarn and Thread?

• Yarn: Used for knitting/weaving, made from twisted fibers (wool, cotton, synthetics).

• Thread: A finer, stronger cord (often plied) for sewing 1.

3. Types of Yarn Spinning Methods?

• Ring Spinning: Traditional, high-quality yarn.

• Rotor (Open-End) Spinning: Faster, coarser yarn.

• Air-Jet Spinning: High-speed, uniform yarn 57.

4. What is Combed vs. Carded Yarn?

• Carded Yarn: Less refined, retains impurities; cheaper (e.g., for denim).

• Combed Yarn: Fibers are combed to remove short strands; smoother, stronger (e.g., premium apparel) 8.

5. How is Polyester Yarn Made?

Polyester is synthesized from petroleum-derived ethylene, processed into filament, staple, or fiberfill forms 14.

6. What is Mercerization?

A chemical treatment for cotton yarn/fabric using caustic soda (20–25%) to increase strength, luster, and dye affinity 17.

7. Key Parameters for Yarn Quality?

• Count (Ne, Tex): Thickness (e.g., 20Ne = 29.5 Tex).

• Twist (TPI): Higher twist = stronger but stiffer yarn.

• Evenness: Measured via Uster Tester 57.

8. What is C.S.P. in Yarn Testing?

Count Strength Product = Yarn count × Strength (lb). Higher CSP indicates better quality 7.

9. Sustainable Yarn Trends in 2025?

• Recycled Cotton: From post-industrial waste.

• Bio-Based Fibers: Bamboo, hemp, milk protein yarns.

• Eco-Friendly Dyeing: Low-water methods 9.

10. Common Yarn Defects?

• Slubs: Thick/thin spots.

• Neps: Fiber tangles.

• Barre: Uneven dye uptake 5.