Question

A cotton grey fabric showed drape coefficient of 0.78. Then the drape coefficient of fabric following scouring is

• A. 0.59
• B. 0.681
• C. 0.62
• D. 0.51

Hint:

• Drape Coefficient: Lower value = better drape (more pliable fabric).
• Scouring: Removes impurities, makes cotton softer and more flexible.
• Effect of Scouring on Cotton: Improves drape, thus decreases drape coefficient.

Answer 1

The Correct Option is A

To solve this problem, we need to understand how drape coefficient changes due to scouring in a fabric, particularly for cotton grey fabric.

1. Understanding the Concepts:

- Drape Coefficient (DC): This is a measure of a fabric’s ability to conform to a shape or fall naturally under its own weight. A lower drape coefficient indicates better drapeability (more flexible and less stiff fabric).
- Grey Fabric: Raw fabric straight from the loom without any finishing.
- Scouring: A pre-treatment process that removes natural and added impurities like waxes, pectins, and sizing agents. It makes the fabric softer, improves its absorbency, and usually improves its drape.

2. Given:

- Initial drape coefficient (grey fabric) = 0.78
- We need to find the drape coefficient after scouring.

3. Expected Change:

Scouring typically reduces the drape coefficient, as the fabric becomes softer and more pliable.

4. Evaluating the Options:

Looking at the options provided:
- 0.51 → Significant reduction
- 0.681 → Slight reduction
- 0.62 → Moderate reduction
- 0.59 → Moderate-to-significant reduction

From textile engineering references and practical studies, the drape coefficient of cotton fabric after scouring typically drops by approximately 15%–25%.

Original DC = 0.78
25% of 0.78 = 0.195
Estimated new DC = 0.78 – 0.195 = ~0.585

Final Answer:

The drape coefficient of the fabric following scouring is 0.59.