Defect Classification and Common Issues

From the raw fiber materials to the final manufacturing of the finished fabric, it involves processes such as spinning, weaving, and dyeing, and each of these processes requires multiple consecutive processing steps to be completed. During each level of processing, improper setting of conditions, careless operation by personnel, and mechanical failures, etc., may all cause appearance defects in the products. Therefore, when we produce textile fabrics, we often encounter various flaws, resulting in substandard quality. The common problems in fabric inspection include: 
1. Hole
The warp and weft yarns of the fabric break, resulting in holes of different sizes. This defect is prone to occur in fabrics with denser warp and weft yarns. 
​​​​​​​2. Dirty mark
Spots, drug contamination, drum contamination, foam contamination, color differences, water stains, white spots, and other dirtiness. 
3. Broken Ends
If one or more of the warp yarns of a fabric break, the distance between the two adjacent yarns on either side of the break will increase. In a plain weave fabric, the two broken yarns will lie side by side, resembling a double warp. In a twill fabric, there will be a discontinuity in the fabric pattern. 
4. Broken Pick
The weft yarn in the fabric breaks, but the two ends of the break are very close to each other, meaning the length of the break is relatively short. Such defects are generally not very noticeable. 
5. Coarse End
Due to poor stretching during spinning, the fibers aggregated to form local thickened areas. 
6. Coarse Pick
Due to issues with the yarn quality or the manufacturing process, there is a distinct horizontal thick line that stands out prominently when compared to the surrounding weft yarns. 
7. Filling bar
After dyeing, the surface of nylon fabric will develop horizontal stripes.