[Concern] The appearance of fabric defects and analysis of its causes
Appearance: In the hair of the knitted fabric, laterally continuous terry loops are woven from coarser or finer yarns of a larger gauge. Most of them are single roots, but even there are parallels or multiple roots. According to the dense, thick and normal are different. Cause: When weaving knitted fabrics, operators mistakenly knit with yarns of a non-specified count or denier specification. Misuse of the finer yarns makes the fabric appear thinner. Misuse of thicker yarns results in thicker fabrics. (2) Wrong End Appearance: The warp yarns of woven fabrics have a single or side-by-side thickness that is not specified. If it is a fine yarn, it is called Fine End. If it is a thicker yarn, it is called Coarse End. Contributing factors: The number of bobbin yarns involved in the warping of the menstruation was incorrect and the warp yarns were not specified. Such embarrassment is often defamatory. (3) Wrong Pick Appearance: The weft of the woven fabric has one or more thicknesses that are not specified. If it is a fine yarn, it is called Fine Pick. If it is a thicker yarn, it is called Coarse Pick. Causes: When weaving, the weft yarn of the weft tube, or the number of bobbin yarns fed by the shuttleless weaving machine is wrong, and we use the weft yarn that is not specified. After the operator discovered it, it was removed and shut down. However, weaving machines that change tubes automatically are often not easy to find. (4) Wrong Weaving Appearance: The weave method is wrong, and the texture of the cloth is different from that of the original designer. For example, the left twill is woven into a right twill. Causes: Mostly caused by wearing errors. Others, such as jacquard fabrics are incorrect, warp yarns are misaligned in multi-standard warp fabrics. (5) Wrong Draw Appearance: Two warp yarns that are adjacent to each other are woven together into one fabric. Regardless, the root (actually two) yarns appear particularly thick. This type of cricket is entirely defamatory. If it is found during the primary weaving of the warp beam, the elimination of one of the roots can be completely avoided. Causes: When warping the yarn, it is inadvertent to treat two strands as one; after slashing, the yarns are not clear, and two stick together and form the same root; when the thread is drawn, two threads penetrate the same heddle. (6) Mispick Appearance: Two wefts are woven into the same weaving mouth and even have three or more roots. The length of the parallel weft ranges from the full width of the fabric to more than 10 centimeters near the edge of the cloth. Causes: The full length of the fabric is not parallel to the length, and after troubleshooting due to shutdown, the fabric is not checked. Or if the weft pin fails, the weft is not stopped. If the length of the insurance yarn is not enough, the side shear is not properly set or sharp enough, and the end of the weft is not removed. (7) Set Mark, Fine Appearance: The density of the weft yarn arrangement on the fabric is less than that specified. The weft yarns weave into the length of the fabric are gradually thinned from the normal density, and gradually returned to the original density from the thinnest, forming a thin cloth with a constant width. Causes: The needle of the weft is broken, and the idle yarn continues to idling; the tension of the warp yarn is not properly controlled during weaving; the tension of the warp yarn is too tight before stopping and driving. (8) Set Mark, Coarse Appearance: The density of the weft yarns arranged on the fabric is denser than the regulations. The weft yarn weaves along the length of the fabric gradually densifies from the normal density, and then gradually returns to its original density from the closest density, forming a narrow cloth with a narrow width. Cause: The tension of the warp yarn is not properly controlled during weaving; the tension of the warp yarn is too loose when stopping and driving. (9) Pick-Out Mark Appearance: The weft of the weft cloth is not well dismantled. After weaving continues, there are still marks on the cloth surface. Causes: In the weaving of fabrics, the operators found that wefts were weaving at different places, or weaving severely dense roads, sparse defects, and immediately shutting down and weaving the wefts weaving. When the warp yarn is removed, the warp yarn is rubbed off by the weft yarn, resulting in a large amount of hairiness. Therefore, after reweaving, the warp yarn exhibits a width-equivalent multi-hairiness cloth surface in the scope of original dismantling. (10) Broken End Appearance: The warp of the fabric breaks one or more roots, resulting in a large distance between the two adjacent yarns. In plain weave fabric, it becomes two broken yarns juxtaposed, as if by. In twill weaves, there is a phenomenon of discontinuity. Causes: The warp yarn is interrupted by weaving and the stopping device fails. Weaving continues without weaving the warp yarn. (11) Broken Pick Appearance: The weft yarn in the fabric breaks, but the distance between the ends of the break is very short, ie the length of the cut off is small. This type of defect is generally not significant. Causes: The weft yarn breaks in weaving, but it continues to weave in a moment, only a short distance away; the weft yarn has serious rough knots and flying flowers, which causes the weft yarn to break when it is removed. (12) One hundred feet (lacking) Appearance: This kind of flaw only occurs in the twill weave, in the warp of the same part of each complete organization, at the same time floating on the surface of the cloth, it resembles a set of many feet. Causes: When a twill weaves less weft yarn, the interweaving point decreases, and part of the warp yarn floats on the weft yarn twice. (13) End Snarl Appearance: One of the warp yarns in the fabric has a small amount of curling and twisting and weaving into the cloth. Fabrics made from strong twisted yarns are more likely to occur. Causes: One of the root warp yarns was loose during warping, causing a period of curling. (14) Filling Snarl Appearance: Fabric weft yarns have a small amount of curling and weaving into the fabric. Fabrics made from strong twisted yarns are more likely to occur. Causes: In the weft bobbin or in the bobbin yarn used for the weft yarn, the small yarn has been curled up. The weft bobbin is improperly formed, and it is not smooth when the yarn is unreeled; the weft yarn tension is too small and the weaving mouth is not clear. (15) Reed Mark Appearance: Between the two warp yarns, there is a large gap between the two warp yarns, and weaving weft yarns can be seen. Causes: The deformation of the steel tusks, the failure to control the warp yarns in position, or the occurrence of loosening of the dents, and the number of roots in the warp yarns, or the number of gaps in the warp yarns, are excessively high during weaving. (16) Temple Mark Appearance: Approximately 2 to 5 cm wide acupuncture or traces of acupuncture in the cloth. In severe cases, the weft yarns of the part are wavy and curved. Cause: The thickness of the needle used in the temple supporter is not appropriate, and the stall supporter stuck in the ring cannot be rotated, or the rotation is not smooth enough. (17) Rolling Appearance: In the position near the edge of the cloth, there are many broken strands in succession. Although they are properly attached, there are still many yarn tails on the surface of the fabric after continuous weaving. Cause: The shuttle is clamped in the mooring passage, which cuts off many warps. More often than not, the structure of the shuttle is poor and the movements of the pick and the opening are hindered. The shuttleless loom that is used now can avoid such defects. (18) Square eyes Appearance: The two warp yarns that are judged are squeezed together, and the gap between the left two and the right two is increased, forming a checkerboard-like small square lattice with the weft yarn. Causes: The angle of the weaving opening is too large during weaving; the warp tension between the upper and lower layers is too different; the density of the teeth of the steel pick is uneven. (19) Yarn tail Appearance: On the surface of cloth or cloth, there is residual yarn protruding from the fabric. Cause: Due to warp or weft breakage, the tail was not trimmed after being attached. The side of the loom did not cut the thread and did not cut off the yarn after the weft insertion. (20) Connector Appearance: Thick and round ball with tight knotting on the fabric. Cause: After the warp or weft breaks and joins, the knots hit are too large to protrude from the fabric. (21) Float Appearance: warp or weft yarns are not woven in accordance with the specified organization, but float on the surface. Cause: The angle at which the weaving mouth is opened is too small, or the heald wire is suspended unevenly, and a few warp yarns are particularly loose. (22) Cobweb Appearance: Judging by the warp or weft yarns, continuous yarn jumping occurs at the same site, so that there is no interlacing point at a part of the fabric to form a mesh. Cause: Same as jumping yarn, only more serious. (23) Weaving Hole Appearance: The warp and weft yarns of the embroidered fabric break, forming holes of different sizes. This kind of flaws can easily occur in fabrics with relatively longitude and latitude. Causes: The friction of the shuttle, the licker-in holding the fishing hook, will cause the warp and weft to break. In addition, the warp can also break the warp. (24) Slack End Appearance: The warp yarn weaves into the cloth, in the interweaving point, is convex and concave on the surface of the cloth, and it is arched upward. Generally speaking, it is called ribs in the factory. Causes: The warp yarns of a single warp are under less tension during weaving, or the warp yarns are too loose after the warp yarns are joined. (25) Slack Filing Appearance: A weft yarn that is woven into a cloth, at the point of its intertwining, protrudes from the cloth more than normal and has a phenomenon of upward arching. Generally not obvious. Cause: A single weft yarn has less tension when weaving. Quilt Blanket,Bedding Blanket,Pure Polyester Blanket,Home Textile Blanket SHAOXING OPAL TEXTIL & GARMENT CO.,LTD. , https://www.opalhometex.com