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Arman Hossain Akash
Department of Textile Engineering
Ahsanullah University of Science & Technology, Dhaka, Bangladesh
Email: [email protected]
What is 4 Point System?
The four-point assessment method is a commonly established method of fabric inspection globally. Fabric inspection is done as per ASTM D 5430–04 standard and this system is agreed by The American Society for Quality Control, Textile and Needle Trades Division, The American Apparel Manufacturers Association and is used by the United States Government for all of their piece goods purchased.
The main considerations in a 4 point inspection system are given here:
Table 1.1
Assignment of Penalty Points in 4 Point System
Size of the Defect | Penalty Points |
Length of defects in fabric (either length or width) | |
Defects up to 3″ | 1 |
Defects >3″ ≤6″ | 2 |
Defects >6″ ≤9″ | 3 |
Defects >9″ | 4 |
Holes and openings (largest dimension) | |
1″ or less | 2 |
Over 1″ | 4 |
A fabric roll 160 yards long and 47″ wide contains the following fabric defects as shown in Table 1.2.
Advantages
Table 1.2
Example of Defective Points in Fabric
4 defects up to 3″ length | 5 × 1 | 5 points |
3 defects from 3 to 6″ length | 2 × 2 | 4 points |
2 defects from 6 to 9″ length | 4 × 3 | 12 points |
1 defect over 9″ length | 2 × 4 | 8 points |
1 hole over 1″ | 1 × 4 | 4 points |
Total defect points | 33 points | |
Therefore, points/100 sq. yards = (33 × 3600)/(160 × 47) = 15.79 points |
Total defect points per 100 square yards of fabric should be determined and the criterion for the acceptance of a fabric roll is generally not more than 40 penalty points. If it is more than 40 points, it will be considered ‘seconds’.
The formula to determine the penalty points per 100 square yards is given by-
Total points scored in the roll × 3600
——————————————————————————-
Fabric width in inches × Total yards inspected
Reference –
Abernathy, F.H., A. Volpe and D. Weil. 2004. The Apparel and Textile Industries after 2005: Prospects and Choices. Harvard Center for Textile and Apparel Research, Cambridge.
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