Interpretation of weaving defects in woven fabrics

Summary: (1) Wrong Yarn Appearance: In the wool of knitted fabrics, the horizontally continuous loops are woven from thicker or finer yarns. Most of them are single roots, but occasionally there are multiple roots side by side or spaced apart. The density and thickness of the vision are different from normal ones. Cause: When weaving knitted fabrics, the operator mistakenly knitted with yarn of non-specified count or denier specifications. If you misuse finer yarn, the fabric will appear thin. If you misuse thicker yarn, the fabric will appear dense.

(1)Wrong Yarn

Appearance: In the wool of knitted fabrics, horizontally continuous loops are woven from thicker or finer yarns. Most of them are single roots, but occasionally there are multiple roots side by side or spaced apart. The density and thickness of the vision are different from normal ones.

Cause: When weaving knitted fabrics, the operator mistakenly used yarn with non-specified count or denier specifications. If you misuse finer yarn, the fabric will appear thin. If you misuse thicker yarn, the fabric will appear dense and thick.

(2)Wrong End

Appearance: The warp of the woven fabric has a single warp or several parallel warps of non-specified thickness. If it is a thinner yarn, it is called FineEnd. If it is a thicker yarn, it is called Coarse End.

Cause: During warping, the number of yarns used to draw the warp is wrong, and warp yarns of non-specified specifications are used. This kind of defect is often a complete match.

(3)Wrong Pick

Appearance: The weft of woven fabrics has one or more consecutive wefts of non-specified thickness. If it is a finer yarn, it is called Fine Pick. If it is a thicker yarn, it is called coarse pick.

Cause: During weaving, the weft yarn in the weft tube or the package yarn count fed into the shuttleless loom is wrong, and weft yarn of non-specified specifications is used. After the operator discovers it, he often shuts down the machine and dismantles it. However, looms with automatic tube changes are often difficult to find.

(4)Wrong Weaving

Appearance: The weave is wrong and the texture of the cloth is different from the original designer. For example, left twill weaves into right twill, etc.

Cause: Usually caused by incorrect threading. Others include errors in the pattern of jacquard fabrics, errors in the arrangement of warp yarns in multi-standard warp fabrics, etc.

(5)Wrong Draw

Appearance: Two adjacent warp yarns are brought together and woven into the cloth as one according to the fabric structure. Looking at it, the yarn (actually two yarns) looks particularly thick. This kind of defect is a complete one. If it is discovered when the warp beam is first weaved, it can be completely avoided by removing one of the parallel beams.

Causes: 1). When warping and pulling yarns, two yarns are ignored as one. 2). After sizing, the yarns are not clearly separated, and the two yarns are stuck together and look like the same yarn. 3). When threading heddles, two heddles are threaded into the same heddle.

(6)Mispick

Appearance: Two weft yarns are woven into the same weft, and occasionally there are three or more weft yarns. The length of the weft varies, with the full width of the fabric being more common than the wefts that are about 10 centimeters from the two edges of the fabric.

Causes: 1). The long and parallel weft of the fabric was due to the failure to check the fabric hem and start the machine after shutting down the machine to troubleshoot. Or the weft finder needle fails and the weft breakage does not stop automatically.
2). For parallel wefts that are not full length, the length of the warp yarn is not enough, the edge shear setting is improper or not sharp enough, and the yarn tail is not removed after weft breakage.

(7)Set Mark, Fine)

Appearance: The density of weft yarn arrangement on the cloth is less than specified. The weft yarn woven into a section along the length of the fabric gradually becomes thinner from normal density, and then from��, the tension received during weaving is too high.

(16)Temple Mark

Appearance: There are traces of needle pricks or needle scratches about 2 to 5 cm wide in the edge of the fabric. In severe cases, the weft yarn in this part will bend in a wavy manner.

Cause: The thickness of the needle used for the temple support is not suitable, the thorn ring of the temple support is stuck and cannot rotate, or the rotation is not smooth enough.

(17)Shuttle

Appearance: There are many broken warps in a row near the edge of the cloth. Although the warps are connected properly, there are still many yarn tails on the cloth after continued weaving, and the joints are The woven cloth is extremely dense.

Cause: The shuttle is clamped in the shed, thus cutting a lot of warp yarns. It is mostly caused by poor shuttle structure and obstruction of shuttle picking and opening movements. The shuttleless looms currently in use can avoid the occurrence of such defects.

(18)Square Eyes (Reedness)

Appearance: Two warp yarns are squeezed together, and the gap between the two warp yarns on the left and the two on the right increases, forming a small checkerboard-like square grid with the weft yarns.

Causes: 1). The opening angle of the cloth opening during weaving is too large. 2). The difference in warp tension between the upper and lower layers is too large. 3). The density of the reed teeth is uneven.

(19)Yarn Tail

Appearance: On the fabric or at the edges, there are residual yarn ends protruding from the fabric.

Cause: Due to breakage of warp or weft yarn, the yarn tail was not cut off after splicing. Or the edge shear of the loom failed and the yarn tail after weft change was not cut off.

(20)Joint (Knot)

Appearance: There are thick and large balls tightly knotted on the cloth.

Cause: The warp or weft yarns are broken and then joined together. The knot is too big and protrudes from the cloth surface.

(21)Float

Appearance: The warp or weft is not woven according to the specified organization and floats on the surface of the cloth.

Cause: The opening angle of the fabric fell is too small, or the healds are unevenly suspended, and a small number of warp yarns are particularly loose.

(22)Spider Web

Appearance: The warp or weft yarns that are aligned with each other produce continuous yarn jumps in the same part, so that the fabric in one part has no interweaving points and forms a network.

Cause: Same as jump yarn, only more serious.

(23)Weaving Hole

Appearance: The warp and weft yarns of the gray cloth are broken, forming holes of different sizes. This kind of defect is likely to occur in fabrics with dense warp and weft.

Cause: The friction of the shuttle and the gripping of the hook by the licker-in will cause the warp and weft to break. In addition, the rolling of the shuttle can also cause the warp to break. (24)Slack End

Appearance: A warp yarn woven into the cloth has an upward arching phenomenon at its intersection point, which is more convex and concave than normal. Generally in factories, it is often referred to as a rib stand.

Cause: The tension on a single warp yarn is small when weaving, or the warp yarn is too loose after joining the warp yarns.

(25)Slack Filing

Appearance: A weft yarn woven into the cloth, at its interweaving point, protrudes from the cloth surface than normal, with an upward arching phenomenon. Generally not obvious.

Cause: A single weft yarn experiences less tension during weaving.

AAA
Interpretation of weaving defects in woven fabrics

Disclaimer:

Disclaimer: Some of the texts, pictures, audios, and videos of some articles published on this site are from the Internet and do not represent the views of this site. The copyrights belong to the original authors. If you find that the information reproduced on this website infringes upon your rights, please contact us and we will change or delete it as soon as possible.

AAA/b>

Appearance: A weft yarn woven into the cloth, at its interweaving point, protrudes from the cloth surface than normal, with an upward arching phenomenon. Generally not obvious.

Cause: A single weft yarn experiences less tension during weaving.

AAA
Interpretation of weaving defects in woven fabrics