Refers to the degree of change in the length of the yarn, which can also be expressed as the unevenness of the yarn.
The unevenness of the yarn is divided into short pieces, uneven pieces and long pieces.
1) short fragment uneven : the occurrence of uneven interval length is 1-10 times the fiber length , about 1m below the interval is uneven, called the short fragment uneven;
2) The fragment is not uniform : the length of uneven interval is 10-100 times the fiber length , about several meters is the uneven interval, called the fragment uneven;
3) Long fragment unevenness : The uneven interval length is 100-3000 times of the fiber length , and unevenness of about tens of meters is called long fragment unevenness.
When weaving with a yarn with a relatively high density of short pieces, the probability that several thick sections or details are juxtaposed on the fabric surface is greater, which has a greater influence on the quality of the fabric; Obvious horizontal stripes appear, and the effect on the fabric surface is also relatively large. Relatively speaking, yarns with uneven segments have a slightly lower chance of fabric defect when weaving, and are related to the cloth width. When a certain multiple relationship appears, it will appear. Obvious defects ( line or cloud spots ) . And in the weaving process, it will also lead to an increase in the breakage rate . Therefore, the evenness of the yarn is an important indicator to evaluate the yarn quality.
2 The main reason for uneven yarn production
1) Â Differences in fiber properties : The length, fineness, structure and morphology of natural fibers are not uniform. This unevenness not only occurs between roots and roots but also in different parts of the same fiber. Non-uniformity is better than natural fibers, but there are still some differences in nature. This inhomogeneity of the properties or the difference in properties of the fibers will cause uneven yarn dryness, which is manifested by a rise in the CV value and an elevation of the spectrogram.
2 Â ) Â The fibers are randomly arranged : the fibers are equal in length and equal in thickness, and the fibers in the yarn are all parallel and straight. The spinning equipment and the spinning process are all free of defects, and the yarns will still be uneven due to the sliver The number of fiber reports in the section is randomly distributed. This unevenness is the lowest limit unevenness, also called the unevenness of the limit.
3) Â Chance of causing unevenness: The fly adhesion, intarsia gear, the traverse guide position, air conditioning failure, etc.
For more content, please follow this site
Nylon Taffeta Waterproof,Nylon Twill Satin Fabric,Nylon Twill Woven Fabric,Nylon And Polyester Taffeta
Shanghai Shining Trading Co.,Ltd , https://www.smaitex.com