The different parameters of yarn are given below:
it is the tensile strength of yarn. The braking force per unit linear density of a yarn is called tenacity of yarn. It is expressed as grams-force per tex (gf//tex). It gives the real tensile strength of a yarn. As the tenacity increases, the strength of yarn becomes better.
The length of yarn in kilo-meters” at which yarn begin to break due to its own weight when the yarn is hung vertically. It is equivalent to breaking load in grams/ tex. The yarn having the value of RKM more than 20 is considered as the best yarn.
This is a measure of variation of linear density or count of yarn in term of percentage. It shows the total imperfections in percentage. If a yarn has lower uster %. It means this yarn has a lower imperfection. The quality of this yarn will be better.
A very short thick place in the yarn (a small yarn defect containing a length of 2milimeter, the diameter of 3 times or more at a standard setting of 200%) is called nep. It is made of unopened fibres , broken seed coated by fibres or a trash particle. It can be + 200% thicker than the average diameter of yarn. The increase for neps is calculated to a reference length of 1mm. They can be a bunch of entangled fibres commonly not bigger than pin ball head.
A place in the yarn having yarn diameter in excess of +50% of the average yarn diameter and the length 8-12 mili meters is considered as the thick place. This yarn defect affects fabric appearance.
A place in the yarn having yarn diameter -50% or more than average diameter and any length is considered as the thin place. This is a very serious defect. Any thin place causes end break during weaving. The number of thin places per 1000 meters should be in the range of 1- 2 . Higher number of thin places creates serious troubles during weaving. The productivity of loom decreases. The fabric quality also influences.
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