Important Measurement Point for Determining Fiber Quality

Determining Fiber Quality:
In yarn manufacturing process, it’s very important to know to determine fiber qualities and fiber properties. Because the lion share cost of yarn manufacturing goes to raw materials. So attaining quality garments is very argent to dignify raw material’s qualities. That’s why we have some specific measurement points by which we can specify actual yarn quality. Some of them are given below with a small description.

Determining Fiber Quality
Fig: Cotton fiber bell

Some Important Measurement Point for Determining Fiber Quality

1. Uniformity Ratio:

………………………………..Mean fiber length            .100
Uniformity ratio = …………..……………………….. × ………
…………………………….Upper half mean length         .1

Mean length is the average length of all fibers approximately ¼’’ and longer, and upper half mean length is the estimate of the lengths of fibers in the upper half portion as measured by the fibrograph.

Rating of cotton fibers with respect to uniformity ratio

Uniformity Ratio Rating
Above 80 Uniform
76-80 Average Uniform
71-75 Slight irregular
70 and below Irregular

2. Coefficient of Variation (CV):
CV is a relative measure of the length variation. The larger the value, the greater the variation in fiber lengths, and, conversely the smaller the value, the more uniform are the fiber lengths.

Rating of cotton samples with regard to fiber length variation

CV% Rating
Below 27 Low variability
27-34 Average variability
35 and above High variability

3. Fibre Fineness rating in micrograms/ inch:

Fibre Fineness Rating
Very fine Below 3.0
Fine 3.0 to 3.9
Average 4.0 to 4.9
Course 5.0 to 5.9
Very course 6 and above

4. Maturity ratings:

Rating Maturity Ratio
Very mature Above 84%
Mature 77 to 84%
Average 68 to 76%
Immature 60 to 67%
Very Immature Below 60%

5. Fiber strength rating is 1000lbs. per square inch:

Rating Strength rating in 1000 lbs.
Superior 93 and above
Very superior 87 to 92
strong 81 to 86
Average 75 to 80
Fair 70 to 74
Weak Below 70

6. Effect of short fibre in yarn:

                                  For good spinning 14%, short fibre is accepted as allowable
Short  fibre% 8% 13% 15%
Break Factor 1904 1723 1620
Elongation 8.3 7.8 7.2
Break per 100 32 52 54.8
Spindle hourse
Author of this Article:
Amit Kumar Das
Founder of "টেক্সটাইল ম্যানিয়া" Blog
Pabna Textile Engineering College, Pabna, Bangladesh
Cell: 01770 456240
Email: [email protected]

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