5. The relationship between yarn body and yarn type
Different types of yarns such as ring spinning, compact spinning, air spinning, AB yarn, slub yarn, etc., different yarn structures will affect the physical characteristics of the yarn, and the yarn quality, appearance and shape characteristics are obviously different, and the scatter plot will show different yarn defect distribution characteristics. It will also have different degrees of influence on the detection function of capacitive and photoelectric sensors.
Fig.20 R20.5S slub yarn iMH C15 detection head
Fig.21 T80/R20, 31S slub yarn, iMH C15 detection head
Fig.22 Slub yarn, 100% cotton, 6.9S, iMHO30 detection head
Fig.23 Slub yarn, 100% cotton, 8S, iMHO30 detection head
Fig.24 Slub yarn, 100% cotton, 52.1tex, iMHO30
图25 竹节纱，100%棉，Nec20，iMH C20
Fig.25 Slub yarn, 100% cotton, Nec13, iMHO30 detection head
6. The relationship between the yarn body and the sensor model
The detection principle of capacitive and photoelectric is different, and the detection results of the same yarn are also different.
(1) The shape of the yarn formed by the photoelectric sensor is similar to the shape of the "rhinoceros horn", and the edge of the yarn body drops quickly from left to right.
(2) The shape of the yarn formed by the capacitive sensor is similar to the shape of the "yellow horn", and the edge of the yarn body decreases slowly from left to right.
图26 100%棉,普梳,40S,UQ3iMHO30
Photoelectric sensors use invisible infrared light as a light source to detect the "side projection shape" of the yarn. Different colors or materials have different absorption properties of infrared rays, and the infrared rays detected by the iMK are partially "absorbed" by the colored yarns, so the light received is not proportional to the actual diameter of the yarn. Capacitive sensors, on the other hand, "indirectly" sense the thickness of the yarn based on the amount of medium filled and the dielectric coefficient. As a result, the shape of the defects detected by the two sensors for the same sample is also different, and therefore the yarn body is also different.
Figure 27 Relationship with sensor size (C15, C20).
Fig.28 100% fine denier modal, 50 Nec, ring spinning, iMHO30
图29 100%棉,紧密纺,50Nec;iMHO30
UQC and CCU allow two types of detection heads to exist on the same winder, but due to the difference in sensor detection principle and sensitivity, it is not allowed to use two types of sensors for yarn clearing at the same time. This is because there is a noticeable difference in yarn quality.
7. The relationship between yarn body and yarn count
The size of the yarn defect is relative to the yarn count. Yarn defects of the same absolute size have a larger relative size (thickness, sensitivity) and a "wide" yarn body for yarns with a thinner yarn count, while a yarn with a thicker yarn count has a smaller relative size (thickness, sensitivity) and a "thin" yarn body.
8. The relationship between the yarn body and the spinning method
A spinning mill often has multiple types of spinning equipment, from carding to spinning processes.
The differences in the design concept, manufacturing accuracy, manufacturing process, and structural performance of these devices will cause the microscopic quality of the same product on the UQ3 yarn body - the change of the NSLT scatter plot between 8 and 200 cm.
9. The relationship between the yarn body and the fabric style and fabric quality
The structure of the fabric is made up of the weaving process and the yarn structure. The quality of the fabric is determined by the weaving process and the quality of the yarn.
The yarn body reflects the size and distribution of yarn defects, which affects the surface style of the fabric. Through the morphological changes of the yarn, the surface quality and style characteristics of the fabric can be indirectly understood.
CMT5 PROPOSES A TERM THAT CAN BE USED TO DESCRIBE THE STYLE AND QUALITY OF FABRICS – "UNEVENNESS VALUE" (THE GEOMETRIC AREA OF THE DARK GREEN AREA OF THE YARN BODY™).
Comparatively speaking, the texture clarity of the fabric surface is better when the yarn body is "thinner". However, the surface style of yarn fabrics with thin yarn body, short average fiber length and low strip dry coefficient of variation is worse than that of yarn with thin yarn body, long average fiber length and low strip dry coefficient of variation.
10. UQC 2 yarn body "vertical line"
On the NSLT scatter plot of UQC2, the distribution of stubble yarn defects is represented by the density of "vertical bars" spaced at "2mm" intervals. When the density of yarn defects (quantity + size) is high, these yarn defects will form "vertical bars". For example, in the NSLT scatter plot of 60S yarn, the yarn defects of grade A and B are dense, and there may be problems with the carding of the carding machine.
FIGURE 30
In the daily quality monitoring, the "yarn" form should be observed frequently, and it is best to copy and record it, so as to carry out quality monitoring and comparison, and analyze the reasons for changes in time.
Note: The NSLT scatter plot with a winding length of ≧ 100km should be selected for copying to ensure comparability.
11. Between the yarn body and the yarn body variation area
There are dense yarn defects
In Fig. 31, there are dense yarn defects between the yarn body and the yarn body variation area, and the surface yarn of the fabric woven by this kind of tube yarn will have more yarn defects and the cloth surface quality will be poor.
FIGURE 31
12. The relationship between reference length and variation
（引自 USTER QUANTUM 3 Application Handbook_Winding）C和CC通道的参考长度越短，变异结果的变化就越大。
Fig. 32 Effect of reference length and variation
Editor: China Yarn Network New Media Team
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