Due to the coarse details and uneven twist on the yarn, it will cause some weaker segments on the yarn to form the hidden danger of spun yarn breaks, which is called 'weak loop of strong yarn'. The existence of strong yarn loops is one of the key factors restricting the speed increase of the spinning frame.
The reason for the strong and weak loops on the yarn is mainly because of the details and weak twists on the yarn. The strength characteristics of the raw yarn include average strength, strength unevenness, average elongation, and elongation unevenness. In general, the average strength of warp yarn is 15cN / tex, and the uneven strength is about 9% to 10%. The average strength of weft yarn is 12cN / tex, and the uneven strength is about 9% to 10%. The average elongation at break is generally controlled within 2%. Harm of strong weak ring Strong weak ring generally refers to the lowest strength of the yarn.
The important strength index of the air jet loom when it is stopped is strong weak ring. It is generally considered that when the fineness of the yarn is only 40% of normal yarn, this kind of detail weak ring It will inevitably cause head breaks and stoppages. If the strong and weak ring is at 4cN / tex and the elongation is less than 2%, it will inevitably cause head breaks. In addition to 61% of other strong and weak loops, details such as weak twist, poor joints, and miscellaneous thick joints will cause stoppages between warp and weft, accounting for about 39%. In addition to the average strength and uneven strength of the strong factors that cause the warp and weft yarns to stop, the strong weak ring is an important factor. Japanese merchants buy yarn in China, and especially emphasize the number of 100,000 strong weak rings.
According to the 100,000 Draw Texturing Yarns Manufacturers breakage detected by the high-speed large-capacity strength machine tensogiet to judge the possibility of yarn purchase, so the knitting and weaving mills of a relatively large size must pay special attention to the strength of the weak ring. Should be equipped with tensogiet tensiometer as much as possible to ensure the quality of the original yarn.