(1) Wrong Yarn
Appearance: In the wool of knitted fabrics, the horizontal continuous loops are woven from yarns that are thicker or thinner than the yarns used in the specifications. Generally, it is a single root, but occasionally there are multiple roots juxtaposed or spaced. The density and thickness are different from those of normal ones.
Cause: When weaving knitted fabrics, operators mistakenly use non-specified counts or denier specifications for weaving. If finer yarn is misused, the fabric will appear thinner. If thicker yarn is misused, the fabric will appear dense.
(2) Wrong End
Appearance: The warp of the woven fabric has a single or several parallel yarns of non-specified thickness. If it is a thinner yarn, it is called Fine End. If it is a thicker yarn, it is called Coarse End.
Cause: During warping, the yarn count of the package used to draw the warp is wrong, and warp yarns of non-specified specifications are used. Such defects are often all-matching.
(3) Wrong Pick
Appearance: The weft fabric of woven fabrics has one or more continuous wefts of non-specified thickness. If it is a thinner yarn, it is called Fine Pick. If it is a thicker yarn, it is called a coarse weft (Coarse Pick).
Cause: During weaving, the weft yarn of the weft bobbin or the yarn count of the bobbin fed by the shuttleless loom is wrong, and the weft yarn of non-specified specification is used. After the operator finds out, he often shuts down and dismantles it. However, the loom with automatic tube change is often difficult to find.
(4) Wrong Weaving
Appearance: That is, the weaving method is wrong, and the texture of the cloth surface is different from the original designer. For example, weaving left twill into right twill and so on.
Cause: Generally, it is mostly caused by drawing-in errors. Others, such as wrong patterns of jacquard fabrics, wrong arrangement of warp yarns of multi-standard warp yarn fabrics, etc.
(5) Wrong Draw
Appearance: Two adjacent warp yarns are combined together, and are woven into the cloth as one according to the fabric structure. Looking at it, the yarn (actually two) is particularly thick. This kind of defect is all of the same nature. If it is found during the initial weaving of the warp beam, if one of the juxtaposed ones is removed, it can be completely avoided.
Causes: 1). When warping and pulling yarns, two yarns are neglected as one. 2). After sizing, the yarn separation is not clear, and the two stick together, which looks like the same yarn. 3). Two heddles go into the same heddle when drawing in the heald.
(6) Parallel weft (Mispick)
Appearance: Two weft yarns are woven into the same fell, and occasionally there are three or more. The length of the doubling weft is different, the ones with the full width of the fabric are more, and the ones near the two selvedges are more than 10 cm.
Causes: 1). The weft and weft of the full length of the fabric is due to the failure to check the weaving gap and start the machine after stopping the machine to eliminate the fault. Or the weft probe fails, and the broken weft does not stop automatically. 2). For non-full-length doubling, the warp is not long enough for safety yarn, the edge trimmer is not set properly or is not sharp enough, and the yarn end is not removed after the weft is broken.
(7) Pick-Out Mark
Appearance: The weft yarn of the gray cloth is not removed properly, and after weaving continues, there are still traces on the cloth surface.
Cause: During the fabric weaving, if the operator finds that weaving with different wefts, or weaving has serious dense and sparse weaving, immediately stop the machine and cut off the woven weft yarns. During removal, the warp yarns are rubbed by the weft yarns, resulting in a large amount of hairiness. Therefore, after reweaving, in the original removal area, there will be a piece of hairy cloth with equal width and narrowness.
(8) Broken End
Appearance: One or more warp yarns of the fabric are broken, causing the distance between the left and right adjacent yarns to become larger. In plain weave fabric, it becomes two broken yarns juxtaposed, just like parallel warp. In the twill fabric, the cloth pattern has intermittent phenomenon.
Cause: The warp yarn is interrupted during weaving, the stop device fails, and weaving continues without the warp yarn being properly connected.
(9) Broken Pick
Appearance: The weft yarn in the fabric is broken, but the distance between the two ends of the break is very close, that is, the length of the break is small. Such defects are generally not obvious.
Causes: 1). The weft yarn breaks during weaving, but it continues to weave in an instant, with only a short distance missing. 2). Severe rough knots and flying flowers on the weft yarn will cause the weft yarn to break when it is removed.
(10) hundred feet (missing weft)
Appearance: This kind of defect only occurs in twill weaving. The warp yarns in the same part of each complete weave float on the cloth surface at the same time, like a collection of centipedes with many legs.
Cause: One less weft yarn is woven into the twill fabric, the interweaving points will be reduced, and some warp yarns will float on the weft yarn twice in a row.
(11) End Snarl
Appearance: One of the warp yarns of the fabric, with a small section of curl twisted together and woven into the cloth. It is more likely to occur in fabrics woven with strongly twisted yarns.
Cause: During warping, one of the warp yarns is too loose, causing a section to crimp.
(12) Filling Snarl
Appearance: The weft of the fabric has a small section of crimp twisted together and woven into the cloth. It is more likely to occur in fabrics woven with strongly twisted yarns.
Causes: 1). In the weft bobbin or the bobbin yarn used as weft yarn, a small section of yarn has crimped and twisted. 2). The shape of the weft bobbin is improper, and the yarn is not returned smoothly. 3). The weft yarn tension is too small, and the weaving opening is not clear, etc.
(13) Reed mark (ReedMark)
Appearance: There is a large gap between the two warp yarns of the gray cloth, and the weft yarn weaving can be seen, which is zigzagged by the action of the reed reed.
Causes: 1). The reed teeth are deformed, and the warp yarn cannot be controlled in position, or the reed teeth are loose. 2). There is one warp yarn or several warp yarns at intervals, which are subjected to excessive tension during weaving.
(16)Temple Mark
Appearance: There are 2 to 5 cm wide needle-punched or needle-punched scratch marks in the edge of the fabric. In severe cases, the weft yarn in this part will be bent in a wave shape.
Causes: The thickness of the needle selected for the temple is not suitable, and the piercing ring of the temple is stuck and cannot be rotated, or the rotation is not smooth enough.
(17) Connector (Knot)
Appearance: There are thick and large balls tightly knotted on the cloth surface.
Cause: The warp or weft yarns are broken and spliced, and the knots are too large and protrude from the cloth surface.
(18) Skipping yarn (Float)
Appearance: The warp or weft yarns are not woven according to the prescribed weave, but float on the surface of the cloth.
Causes: The opening angle of the loom is too small, or the healds are hung unevenly, and a few warp yarns are particularly loose.
(19) Weaving Hole
Appearance: The warp and weft yarns of the gray cloth are broken, forming holes of different sizes. This kind of defect is prone to occur in fabrics with dense warp and weft.
Causes: Shuttle friction, licker-in rollers holding hooks, will cause the warp and weft to break, and rolling the shuttle can also cause the warp to break.
(20) Slack End
Appearance: A warp yarn woven into the cloth, at its interweaving point, the cloth surface is more convex and concave than normal, and there is a phenomenon of upward arching. Generally, it is called tendon stand in the factory.
Cause: The tension of a single warp yarn is small when weaving, or the warp yarn is too loose after joining the warp yarn.
(21) Slack Filing
Appearance: A weft yarn woven into the cloth, at its interweaving point, protrudes from the cloth surface more than normal, and has a phenomenon of upward arching. Generally not obvious.
Cause: A single weft yarn suffers less tension during weaving.
Post time: May-11-2023
