Fiber strength

Strength is very often the dominating characteristics. This can be seen from the fact that nature produces countless fibers, most of which are not usable for textiles because of inadequate strength. The minimum strength for a textile fiber is approximately 6 CN/tex (about 6 km breaking strength).

In relation to cotton, the strength of fiber bundles is measured and stated as Pressly value. The unit is Pressly Index. The following scale of value is used:

Bundle fiber strength—

RANGE	GRADE
≥ 93	Excellent
87 -92	Very Strong
81 – 86	Strong
75 – 80	Weak(Fair)
70 – 74	Medium
≤70	Very Weak

Fiber bundle Strength in gram per tex [gpt] —

 

RANGE	GRADE
≤ 21	Very Weak
22 -24	Weak
25 – 27	Medium
28 – 30	Strong
≥ 30	Very Strong

 
It influences—

1. Spinning limit: If fiber strength increases spinning limit will increase.
2. Yarn evenness: If fiber strength increases, yarn evenness will increase too little extent.
3. Luster: If fiber strength increases, yarn luster will increase.
4. Yarn hairiness: If fiber strength increases, yarn hairiness will decrease.
5. Fineness: Fineness will increase, if fiber strength increases.
6. Productivity: If fiber strength increases, yarn productivity will increase.