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Important Measurement Point for Determining Fiber Quality

Some Important Measurement Point for Determining Fiber Quality
Amit Kumar Das
Founder of "টেক্সটাইল ম্যানিয়া" Blog
Pabna Textile Engineering College, Pabna, Bangladesh
Cell: 01770 456240
Email: amitptec6th@gmail.com


In yarn manufacturing, its very important to know or determine fiber qualities. Because the lion share cost of yarn manufacturing goes to raw materials. So attaining a quality garments its very argent to dignify raw material’s qualities. Thats why we have some specific measurement points by which we can specify actual yarn quality. Some of them are given below with small description.
Cotton fiber bell
1. Uniformity Ratio:

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

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


Rating of cotton fibres with respect to uniformity ratio

Uniformity Ratio
Rating
Above 80
Uniform
76-80
Average Uniform
71-75
Slight irregular
70 and below
Irregular
Coefficient of Variation (CV):
CV is relative measure of the length variation.The larger the value, the greater the variation in fibre lengths, and, conversely the smaller the value, the more uniform are the fobre lengths.

Rating of cotton samples with regard to fibre length variation

CV%
Rating
Below 27
Low variability
27-34
Average variability
35 and above
High variability
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
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%
Fibre strength rating in 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
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

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1 comments:

  1. Helpful post on fiber quality. I have learnt lot from this article. Thanks for sharing.

    ReplyDelete