Question

Direct measurement of degree of thickening (\( \theta \)) of cotton fibre is carried out using

• A. AFIS
• B. HVI
• C. Caustic soda method
• D. Double compression method

Hint:

AFIS is the most accurate method for directly measuring cotton fiber characteristics, including the degree of thickening and fiber maturity.

Answer 1

The Correct Option is A

The degree of thickening (\( \theta \)) of cotton fibers refers to the increase in the fiber's diameter (cross-sectional area) as it undergoes processing, particularly during the spinning or maturation stage. This characteristic is an important factor in determining the quality of cotton, especially in terms of its strength and ability to hold dye during fabric production. The direct measurement of the degree of thickening is carried out using the AFIS (Advanced Fiber Information System), which is a highly accurate and efficient tool in the textile industry.
Detailed Explanation:
1. AFIS (Advanced Fiber Information System):
AFIS is an automated system used extensively in the textile industry to measure the physical characteristics of cotton fibers. It can measure a range of attributes such as fiber length, fiber maturity, and fiber diameter. The system is highly precise and provides rapid results, making it essential for quality control in cotton processing.
- Fiber Maturity and Thickening: In the case of cotton, the degree of thickening (denoted by \( \theta \)) is related to the maturity of the fiber. A mature cotton fiber has a larger diameter and thicker cell wall. The AFIS is capable of measuring the fiber's diameter directly, allowing for the calculation of the degree of thickening.
2. HVI (High Volume Instrument):
The HVI system is another instrument used for measuring cotton fiber properties, such as fiber length, strength, and micronaire (a measure of fineness and maturity). However, it is not specifically used to measure the degree of thickening. Therefore, while HVI is a valuable tool in cotton testing, it is not the correct instrument for measuring thickening.
3. Other Methods:
- Caustic Soda Method: This method is used to measure the maturity of cotton fibers but not the degree of thickening. It involves treating cotton fibers with a caustic soda solution and observing the changes in fiber properties.
- Double Compression Method: This method is used for determining the fiber's compression behavior under stress and does not measure the degree of thickening directly.
Conclusion:
The correct answer is (A): AFIS, as it is specifically designed to measure the degree of thickening (diameter) of cotton fibers.