Yarn evenness testing definition concept and methods:
Yarn evenness means yarn balance. The condition of the machinery used to make the yarn, the different qualities of the fiber, the weather, and the presence of undesirable products all affect the yarn’s evenness. However, it is the responsibility and duty of a skilled technician to produce a yarn that, despite all these adverse conditions, has the same weight, diameter, and several turns per inch, speed, color, and other properties of the same length. This similarity of yarn also means uniformity is called evenness. https://bdfabric.com/how-to-detect-and-reduce-classimat-faults/
Concept of evenness testing:
Irregularity is the opposite of yarn evenness. The evenness of the yarn is judged by its irregularity. The lower the irregularity of the yarn, the higher its evenness, and the higher the irregularity, the lower its evenness. Irregularity testing is the most important of all yarn tests. This irregularity in the yarn also greatly affects the properties of the fabric. https://bdfabric.com/operations-for-controlling-fusing-in-garments-industries/
The following tasks are usually performed by evenness testing.
(i) Mass variation of yarn, roving, and fiber can be determined.
(ii) Defective machine parts responsible for various defects of yarn are identified through spectrogram analysis.
(iii) The quality parameters of the product can be compared with the international standard.
At present, to survive in this competitive market, there is no alternative to producing quality products. The evenness of the product (yarn) is very important. Through this evenness testing, it is possible to maintain the basic quality of the product. Prison Wizard uster Company’s uster Evenness Tester plays an important role in this.
Yarn evenness testing definition concept and methods-Testing method of evenness tester:
There are two types of testing methods in evenness testing
1. Capacitive Method
2. Optical Method
1. Capacitive Method:
Electronic capacitors are used to measure the yarn roving and the accuracy of the screwdriver. In this method, there are two capacitor sheets parallel to each other. The conductivity of the test electrically conductive material under special arrangements is caused by a change in the electrical capacity of the two plates. Which is directly dependent on the thickness or weight of the conductive fluid. That is, the electrical capacity varies with the meaning the difference in the weight (thin-thin place) of the material. This signal of change is processed by a digital processor to obtain a mass variation of the product Sensor CS, Sensor CC works in principle.
2. Optical Method:
The optical method conducts electricity to the photosensitive diode, which varies with the amount of light falling on it (less / more). When the yarn is passed between the light source and the photocell, the difference in the light barrier falling on the cell due to the difference in the diameter of the yarn is also observed, resulting in a change in the electric current in the photocell. By measuring this change electronically, the value of the difference in diameter can be found by working on the principle of Sensor OH, Sensor OM, and Sensor OI.