Specialty yarns including high twist, low twist, untwisted, high tenacity,涡流纺, reverse twist, and bamboo yarn. Offering fine cotton (BCI), organic cotton (GOTS, OCS), recycled cotton, polyester (GRS), African cotton, and Pima cotton yarns with certificates. Hard-to-find yarns, we have them in stock.
Henan QiangNian (Weixian Hesheng) Product Hotline: 13903781186, Mr. Liu
The characteristic of this type of weft skew is that the weft yarns are generally at an angle of approximately 30° to the horizontal standard. This skew occurs during the dyeing and finishing process when the fabric is pulled forward under tension. When the force at the warp and weft intersections varies, the weft yarns cannot advance horizontally uniformly, resulting in differences in speed or hesitation, which causes the weft yarns to skew. The causes for this are multifaceted.
Fabrics from weaving factories may sometimes be tight on one side or on both sides but loose in the middle, leading to rolling during rope processing, difficulty in opening widths, and a tendency to develop linear weft skew.
b. Occasionally, when fabric factories start cutting from the roll, the cuts are not straight. During the dyeing and printing process, the seams are not torn evenly before stitching, resulting in crooked seams. This issue is not corrected during the post-processing stage, causing the misalignment to become more pronounced.
c. During flat rolling, the roller surface is uneven; the roller installation is not level; roller diameters vary, and they are not parallel to each other; pressure at the ends of the roller differs; the machine centerline is not straight, causing the fabric to run crookedly; poor installation quality of the machine, with loose local feet; some components are tilted, unevenly distributing tension on the fabric's warp sides; the length of the cloth hooks on the silk finisher varies, leading to weft crookedness; the angle between the cloth puller roller and the fabric on the cloth feeding edge is too small, resulting in uneven tension on both sides; localized air bubbles or "water bags" may form during flat rolling; wear on guide roller bearings or damaged probes; uneven pressure on both sides of the roller on the cloth inspection machine and unequal blade edges on the bundling machine can all cause weft crookedness.
The aforementioned situations are indicative of abnormal equipment conditions. Improper operation or failure to adhere to standard procedures can also lead to weft slippage. For instance, during the processing stage, in a bid for convenience, operators may randomly tie knots; when entering the flat roller, incorrect handling can cause the fabric to wrinkle or roll; the fabric on the fall roll is unevenly wrapped; and during the feeding or unwinding process, the fabric may歪斜 or sway. Additionally, in the rope processing stage, uneven tension, unevenly flat rope washing machine rollers, and uneven fabric stress can cause weft slippage, as the tension fluctuates between loose and tight. Overlapping heads in the rope machine, uneven stress in the warp direction due to excessive threading paths, and overly tight fabric can also lead to weft slippage. Sometimes, the rope washing machine's threading angle is too large, resulting in high tension and significant weft slippage. Local "water bags" during rope processing can cause irregular weft slippage, and the formation of bubble "water bags" during desizing is even more pronounced. When the fabric transitions from flat to rope or vice versa, if the distance is too short, the fabric may wrap around easily, leading to weft slippage. Large J-shaped fabric fall boxes, with a large arc at the bottom, make it difficult for the fabric to slide, causing it to be tightly pressed and resulting in high tension. After rope processing, if the fabric contains too much moisture, it becomes difficult to open and can lead to weft slippage.
High twist, low twist, untwisted, high tenacity,涡流纺, reverse twist, and bamboo yarns, among other "specialized, refined, unique, and new" yarn varieties. Offer premium cotton (BCI), organic cotton (GOTS, OCS), recycled cotton, polyester (GRS), African cotton, and Pima cotton yarns and certifications. Hard-to-find yarns, we have in stock.
Henan QiangNian (Wei Shu He Sheng) Product Hotline: 13903781186, Mr. Liu
