What is irregularity how it is formed in the yarn?
The random yarn irregularity is simply a function of fiber fineness and the periodic variation that of mechanical condition of the machine. … The drafting wave is formed when the floating or short fibers move out of turn and get. Accelerated to front roller speed by the faster moving fibers.
What is responsible for yarn irregularity?
Given a well blended stock, irregularity of the yarn produced is almost entirely governed by the carding operation. The irregularity in weight per unit length of yarn is very little different from that of carded roving unless the spinner introduces long term variation by unwarranted draft changes at the mule.
What is CV in yarn?
The variation of the yarn count (CV count) is the variation from one bobbin to the other. … In general the lower the C.V.% the better is the measured value of the yarn.
What is yarn imperfection?
Imperfections can be defined as the total number of neps, thick and thin places in a given length of yarn. … A yarn with more imperfections will exhibit poor appearance grade, lower strength and poor performance in weaving is likely to produce fabric with low quality.
What is evenness of yarn?
Yarn evenness, defined as the variation of mass per unit length, can affect several properties of textile materials, especially, the final appearance of the woven/knitted fabric. … Therefore, yarn evenness is one important characteristic that is used to quantify the quality of the final product.
How do you measure yarn evenness?
Mainly two methods are used for measuring yarn irregularity.
- Capacitive method (Uster evenness tester)
- Optical method (Zweigle G580)
What is yarn short answer?
Explanation: Yarn is a long, continuous length of fibers that have been spun or felted together. Yarn is used to make cloth by knitting, crocheting or weaving. Yarn is sold in the shape called a skein to prevent the yarn from becoming tangled or knotted.
What is evenness tester?
Evenness tester-600 is a computerized instrument designed to determine the mass variation and imperfection in yarn, roving and sliver. Capacitive principle for mass variation and imperfection. Instrument functions are controlled by advanced micro controller and windows based user friendly software.
What is Uster evenness tester?
The optical method measures the variations in diameter of a yarn and not in its mass. The instrument an infra-red transmitter and two identical receivers. The yarn passes at speed through one of the beams, blocking a portion of the light to the measuring receiver.
What are the production conditions responsible for hairiness in yarn?
Yarn hairiness is influenced by roving twist, package size, location of the roving bobbin and the roving hank (Chattopadhyay, 2002). Increasing the twist increases the compactness of the roving and thereby reduces the fibre spread under the top roller pressure.