The different parameters of yarn are given below:
it is the tensile strength of the yarn. The braking force per unit linear density of yarn is called the tenacity of yarn. It is expressed as grams-force per tex (gf//tex). It gives the real tensile strength of the yarn. As the tenacity increases, the strength of the 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 a value of RKM more than 20 is considered the best yarn.
This is a measure of the variation of linear density or count of yarn in terms 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 fibers, broken seed coated by fibers, or a trash particle. It can be + 200% thicker than the average diameter of the 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 pinball heads.
A place in the yarn having a 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 an end break during weaving. The number of thin places per 1000 meters should be in the range of 1- 2. A higher number of thin places creates serious troubles during weaving. The productivity of the loom decreases. The fabric quality also influences.
Please watch the below video in Hindi about yarn parameters or yarn specification:
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