Question 18 (Textile Engineering & Fibre Science)
The nep setting on an evenness tester which will give the highest nep count is
Frequently Asked Questions | FAQs
What is the working principle of evenness tester?
The evenness tester, also known as a yarn evenness tester or yarn hairiness tester, is an instrument used in the textile industry to measure the evenness and hairiness of a yarn. The working principle of an evenness tester involves the following steps:
Sample preparation: A small sample of the yarn to be tested is wound onto a skein or bobbin.
Tensioning: The yarn is placed under tension by clamping it at both ends.
Measurement: A sensor, such as an optical sensor, is used to scan the surface of the yarn as it is rotated. The sensor detects variations in yarn thickness and hairiness and generates a signal that is proportional to the degree of variation.
Data analysis: The signal generated by the sensor is processed and analyzed to determine various parameters related to the evenness and hairiness of the yarn, such as the coefficient of variation (CV) and the mean hairiness index (MHI).
The evenness tester can provide valuable information about the quality and performance of a yarn, such as its suitability for certain textile applications and its potential for causing processing problems. By identifying and quantifying variations in yarn thickness and hairiness, the evenness tester can help manufacturers optimize their production processes and improve the consistency and quality of their products.