What is evenness test?
What is evenness test?
The evenness of yarn is one of main indexes to measure the quality of yearns. The usual yarn evenness testing methods mainly include the length measurement and weight measurement method, the visual measurement method and the Uster evenness tester method.
What is the principle of the instrument which measures evenness of a yarn?
Zweigle evenness tester is used to measure yarn evenness with the principle of the optical method. In this instrument, the Infrared transmitter and two identical receivers are arranged as shown in the figure. In this instrument, yarn is passed through or between the infra-red light.
What materials can be tested on Uster evenness tester?
The following staple yarn tests are offered:
- Yarn evenness: USTER® TESTER 6.
- Yarn imperfections (thin places, thick places and neps): USTER® TESTER 6.
- Yarn diameter: USTER® TESTER 6.
- Trash and dust: USTER® TESTER 6.
- Yarn hairiness: USTER® TESTER 6.
- Yarn hairiness length classification: USTER® TESTER 6.
What is Uster Tester?
The “Uster Tester”, a laboratory system for the measurement of evenness, thick places, thin places, neps, hairiness, diameter, dust, trash, fineness of yarns. Yarn tensile testers – at conventional (5m/min) and high speeds (400m/min)
How can you measure yarn irregularity?
Mainly two methods are used for measuring yarn irregularity.
- Capacitive method (Uster evenness tester)
- Optical method (Zweigle G580)
Why do we use Uster evenness tester?
Mainly two methods are used for measuring yarn irregularity. Capacitive method/Uster evenness tester: So if yarn passes through the capacitor plate, the current flow change with respect to thickness/mass of the yarn, thick thin places. This signal then processed by digital processor to get mass variation.
What is the difference between evenness tester and yarn classifying system?
The irregularity or unevenness of a yarn is commonly defined as the variation in fineness along its length and more appropriately as the variation in mass per unit length along the yam’….Yarn Evenness & It’s Classification.
| Periodic Variation | Wavelength |
|---|---|
| Long term variation | 100 to 1000 ( or more) times the fiber length |
What is principle for testing hairiness?
The measuring principle is based on evaluation with diffracted light. Hairiness value H is defined as the total length of all fibre ends sticking out in cm, related to a yarn section of 1cm in length. Hairiness is counted on both sides of the yarn silhouette. As a result, tested values have a rather high reliability.
What is Uster Tester 6?
USTER® TESTER 6 redefines quality testing in spinning mills. It guides spinners to better productivity and profitability – ready for the era of Total Testing. USTER® TESTER 6 is available as automatic and semi-automatic models. From laboratory to Total Testing.
What is Uster Quantum?
USTER® QUANTUM 3 measures, analyzes and proposes how the yarn on the winding machines can best be tailored to the spinner’s quality and productivity needs. Powerful new capacitive, optical and foreign matter sensors are at the core of the USTER® QUANTUM 3.
What is yarn testing?
Yarn test methods that are used when values such as tenacity, elongation or shrinkage are determined. Test room conditions. Linear density. Breaking force and elongation at break.
Why is yarn evenness important?
Yarn evenness deals with the variation in yarn fineness. Thisis the property, commonly measured as the variation in mass per unit length along the yarn, is a basic and important one, since it can influence so samy other properties of the yarn and offabric made from it.
