Current location - Education and Training Encyclopedia - Education and training - How to identify the defects of woven fabrics?
How to identify the defects of woven fabrics?
Barre)- For knitted fabrics, this defect is characterized by some uneven patterns in the transverse direction or transverse direction of the fabric. Uneven yarn, uneven yarn tension and different dye affinity may be the reasons for this situation.

Bad place)-This is a very convenient name for those fabric defects that are difficult to describe in words. This term is usually used to describe places where the weaving of fabrics is seriously damaged.

Deviation (reference weft skew)-For woven fabrics, this kind of defect refers to the place where the weft and warp are deviated in size; For knitted fabrics, this situation refers to the place where the size deviation between horizontal and vertical rows of fabrics occurs.

Bird's eye defect)-For knitted fabrics, this refers to the occasional irregular tuck stitch, contrary to the fabric design.

Bow)- For woven fabrics, this situation means that the weft yarn is located in the width direction of the fabric in an arc shape; For knitted fabrics, this situation means that the courses of loops are located in the width direction of the fabric in an arc manner.

Broken head)-This kind of defect refers to the place where the warp yarn is repaired by broken head. Its common feature is that broken ends can be seen in the fabric.

Broken color pattern)-For woven fabrics, this situation refers to the discontinuity of the pattern, which may be caused by an error in drawing the color pattern with the heald frame of the loom when the weft yarn is broken, or by the incorrect reset of the image filling chain after repairing the loom; For knitted fabrics, this situation is caused by the mistake of shuttle changing bobbin.

Broken weft)-this situation refers to the lack of weft in part of the width of the fabric due to the break of weft.

Bump)-(refers to the temple defect)-This situation refers to the abrasion of the yarn being woven or the woven fabric, which leads to the loss of direction of the fiber and the deformation of the fabric appearance.

Burlmark-this is a kind of deformation caused by excessive substances, including roving, waste yarn and floating yarn being removed with repair tools.

Buttonhole selvage)-This is a kind of fabric selvage defect, which is caused by excessive tension accumulated on the loom shuttle before replacing the weft. This tension often limits the correct opening and interweaving of selvage weft yarns, resulting in buttonhole-like defects.

Friction yarn)-this kind of defect refers to worn yarn, which will make the fiber lose its sense of direction and deform the yarn. This defect will affect the dyeability of yarn and often lead to radial stripes or weft stripes.

Broken weft)-This kind of defect refers to the imbalance in the weft direction, which is manifested as obvious or neat patterns and is caused by the eccentric behavior of the drafting roller.

Pinch marks)-This kind of defect refers to the place where the fabric is not dyed. This defect is caused by a small metal clip clamped on the edge of the fabric. These clips are used to avoid or correct the folding of fabric edges during dyeing.

Thick end)-this situation means that the diameter of a warp yarn is obviously larger than that of the normal warp yarn of the fabric.

Coarse weft)-This means that the diameter of the weft is obviously larger than the normal weft diameter of the fabric.

Coarse yarn)-This means that the diameter of a yarn is obviously larger than the normal yarn diameter of the fabric.

Wrinkled fabric)-for knitted fabrics, this defect refers to those fabrics that are wrinkled, shriveled or fuzzed and cannot be laid flat on the cutting table. This phenomenon may be caused by irregular yarn twist, uneven yarn tension during knitting and uneven yarn reaction in fabric during finishing.

Wrinkled yarn)-this means that some fibers in the yarn look curly and cannot tell the direction of the fibers. The reason is that some yarn fibers are too long relative to the draft roller, so that the latter draft roller has clamped the fiber before the former draft roller releases the fiber, which will cause the fiber to break and curl. Twisted yarns look like tiny twists in the fabric.

Color flying)-This refers to fiber impurities with different colors appearing in yarns or fabrics.

Color misreading)-For woven fabrics, this situation means that the colored yarn drawn by the loom is opposite to the color pattern and/or weave design; For warp knitted fabrics, this situation means that the colored yarn described by the guide bar is contrary to the pattern design.

Color output)-In the printing process, if the color paste in the storage tank is almost used up, the printed pattern will skip.

Color smearing)-This is the pattern deformation caused by painting pigment in the printing process.

Compactor crease)-for knitted fabrics, this defect refers to the hard crease produced by using wrinkled fabrics in the process of controlling shrinkage and stability.

Wrinkling (refers to the hidden wrinkle defect of pre-shrinking pattern)-this defect is the washboard phenomenon caused by the abnormal thick pad of pre-shrinking finishing machine.

Cover)-this term is usually used to describe the defects of fabric surface features, such as the number of warp and weft yarns, whether the pattern is prominent, and other required features that can be obtained by changing one of the two yarn systems.

Crease)-this kind of defect refers to the crease produced by the fabric folding itself under pressure.

Crease stripe)-This kind of defect refers to the visible aftereffect caused by fabric folding in dyeing and finishing work.

Damaged)-This situation means that the fabric has been damaged and can no longer be used for its intended purpose.

Doctor streak)-This kind of defect refers to the narrow and swinging stripes caused by the broken scraper in the printing process.

Double-ended)-this situation refers to the appearance of two warp yarns where only one warp yarn is needed in the fabric design at first.

Double weft)-this means that two weft yarns appear at the shed of the loom, while the fabric design originally only needed one weft yarn.

For a weft yarn, this situation means that the size of this weft yarn is twice as large as the normal size, because both ends of the roving touch one end of the spun yarn at the same time; As for the warp yarn, both ends of the roving touch one end of the spun yarn at the same time, which will cause the warp yarn to be thick.

Tailing)-For warp knitted fabrics, this situation means that the warp yarn is woven under unstable tension because the warp beam entangles the warp yarn.

Disadvantages)-The reason for this defect is that the tension gradually applied to many warp yarns is too large due to some abnormal restrictions. When the restriction is lifted, these too loose warp yarns will gradually weave into the fabric, causing fabric defects.

Weft drop)-This kind of fabric defect is caused by the weft insertion device on the shuttleless loom not being able to hold and release the weft in time. Because the weft insertion device cannot release the weft in time, the weft will enter the main body of the device, resulting in half of the weft missing in the width direction of the fabric. In addition, since the loosened weft yarns are immediately woven into the fabric, in this case, the weft yarns woven into the fabric sometimes get tangled.

Dye stripe)-This is a kind of stripe defect related to dyes, and its occurrence mainly depends on the application of dyes on fabrics or the absorption of dyes by fabrics.

End out)-this situation refers to the lack of warp yarns.

Filling tape)-This means that there is a visually obvious tape in the width direction of the fabric. The difference of physical or chemical properties of weft is the direct cause of this defect.

Weft float (weft float, top float and bottom float)-This situation means that the weft does not pass through the warp where it should, but extends freely above or below the warp.

Fine end)-This kind of defect means that the diameter of one or some warp yarns is obviously smaller than that of the normal warp yarns of the fabric.

Spinning defect-For knitted fabrics, this kind of defect means that the diameter of one or some yarns is obviously smaller than the normal yarn diameter of the fabric, which usually leads to fine line cracks in the transverse direction of the fabric.

Flat warp-This situation refers to the wrong warp threading of plain weave, resulting in two warp yarns overlapping.

Floating yarn (warp, weft and needle jump)-This means that a yarn does not interweave with the yarn in the opposite yarn system, but extends freely above or below it.

Foreign fiber)-this refers to the fiber that exists as an impurity, not an ordinary fabric fiber. These fiber impurities can exist in one yarn or be randomly distributed in the whole fabric.

Foreign matter)-impurities here refer to other pollutants except fiber impurities.

Pilling)-This kind of defect refers to the fiber balls around the warp due to the wear of the loom. The reason for this defect is usually due to insufficient warp sizing, which leads to the formation of so-called soft yarn.

Weaving defects such as flying flowers and flying silk-these fabric defects refer to the accumulation of short fibers or flying flowers involved in yarn or loom shed. The difference between this kind of defect and coarse and fine yarns is that the appearance of coarse and fine yarns is usually symmetrical, while the defects woven by flying flowers and silk usually look like unstretched lumps.

Halo)-this kind of fabric defect refers to the fine weft barrier around a defect due to the migration of dye to the defect during dyeing.

Triangular weft hanging (refers to shrinkage defect)-this situation refers to the moment before the reed scraping, the weft will be entangled with warp knots or other protrusions. This will lead to short loop weft defects on the fabric surface.

Hanging thread)-this means that there are yarns hanging on the surface of the fabric. There are two main reasons for this situation. One reason is that the loom failed to clamp the excess yarn after repairing the broken end, and the other reason is that the clothing inspector failed to remove the excess yarn.

Hard size)-this kind of fabric defect is characterized by a rough and hard place on the fabric, which looks turbid and uneven. This situation is most common in yarn-dyed yarns, and the reason for this situation is that the sizing machine stops working, resulting in excess slurry condensing on the yarn. This kind of defect usually manifests as stripes in the width direction of the fabric.

Harmful balk-this fabric defect is the result that the heald frame of the loom can't move in the prescribed order, which causes the weft to float on the warp instead of crossing the warp where it should cross.

Heald breakage)-This refers to the phenomenon that the warp yarn pulled by the heald stops floating to the front or back of the fabric.

Wrong drawing of heald)-This situation refers to the fact that one or more warp yarns drawn by heald of loom are contrary to the weave design.

Hole)-the meaning of this term is already very clear, so there is no need to describe it in detail.

Jump)-This situation means that the loom shuttle pulls a normal weft into the fabric and an extra weft into the fabric at the same time. On conventional looms, this defect usually occurs on the side of weft tube library. The main reason for this phenomenon is that after yarn change, the thread clamping device can't clamp the weft yarn from the outer tube. The spool is long enough for the temple wire cutter to cut the yarn.

Twisted weft)-this means that the weft will kink in a short distance because it is too loose somewhere in the fabric. The reasons for this phenomenon are as follows: (1) The shuttle package of loom is incorrect; Weft fork can't work normally; The power of shuttle rod is too high; The weft twist is too large, and the weft twist is not set properly.

Knot)-This situation means that the ends of the yarn are tied together.

Loom strip)-this kind of fabric defect is to point out the color strip in the width direction of the fabric now. The reason for this phenomenon is that there is tension accumulation on the loom shuttle before weft change. This defect is most common in dyed fabrics.

Loom waste)-this means that the waste accumulated on the loom enters the fabric through air flow or loom shuttle.

Multi-loop weft (refers to triangular hole defect)-this situation refers to the moment before the reed scraping, the weft yarn will be entangled with warp knots or other protrusions This will lead to short loop weft defects on the fabric surface.

Loose course-For knitted fabrics, this situation refers to the fact that the loops in the loop layer are larger than the normal loops due to the lack of moderate tension of the yarn.

Stop)-this term is used to describe the obvious color stop on the fabric when the machine stops working during dyeing and finishing. Generally speaking, this defect is manifested in the obvious color weft stop in the width direction of the fabric.

Mat-up)-This situation means that warp and weft are intertwined, which destroys the correct interweaving. The reason for this phenomenon is that the loom failed to stop when the yarn was broken, or it may be that floating yarn from other places entered the loom. Meridian cobwebs can be harmless or extremely destructive.

This situation means that one or more warp yarns pulled by the reed are opposite to the design direction.

This situation means that one or more warp yarns are pulled by the reed in the direction opposite to the design.

For woven fabrics, this situation means that the colored yarn pulled by the heald frame of the loom is opposite to the color pattern and/or weave design. For warp knitted fabrics, this situation means that the colored yarn pulled by the guide bar is opposite to the pattern design.

Wrong weft)-This refers to the fact that the weave design is destroyed due to the lack of weft.

For knitted fabrics, this phenomenon is usually caused by the continuous operation of the machine after yarn breakage.

For knitted fabrics, this situation means that the pattern is destroyed due to accidental thread leakage. The reason for this phenomenon may be that the foot piece is stuck, or it may be that the yarn is not fed correctly.

Weft mixing)-This situation refers to the visible stripes caused by the difference between weft and other normal weft in the fabric.

Blended yarn)-this kind of fabric defect refers to the fact that yarns with different chemical or physical properties are mixed in the fabric.

Mottled)-This term is used to describe the appearance of fabrics with many spots. The cause of the spots may be due to uneven coating of pigments on the fabric or uneven absorption of pigments by the fabric.

Needle and thread)-For knitted fabrics, this defect refers to the vertical crack caused by a bent needle. In this case, although the pattern is completely unaffected, the uniform arrangement of vertical rows will be deformed.

Neps)-This situation means that there are too many tangled lumps (neps) on the surface of the fabric.

Open reed (refers to reed defect)-this is a kind of fabric defect caused by bending reed, which is characterized by slender stripes in the warp direction of the fabric.

Misregister)-This situation refers to the pattern deformation caused by the unsynchronized printing rollers in the printing process.

Overshoot)-this means that the weft yarn deviates from its normal path, does not pass through the warp yarn where it should pass, but extends freely on the warp yarn. This kind of defect is most likely to appear in the range of 12 to 15 inches from the fabric edge, and it is caused by incorrect loom setting.

Pattern defect)-for woven fabrics, this situation means that the formation of interlacing or embedding is opposite to the pattern design of the fabric. The reason for this phenomenon is that the machine is not working properly, or it may be because the colored yarn is not properly placed in the heald frame of the loom. For knitted fabrics, this defect is that the formation of pointer feet or the embedding of colors is contrary to the pattern design of fabrics. The reason for this phenomenon is that the machine is not working properly, or it may be because the colored yarn is not placed correctly on the roving frame.

Pinholes)-Pinholes are common in fabrics run over by a needle chain tenter, but if the pinholes are too far away from the edge of the fabric, or if the pinholes expand and tear, then this kind of fabric defect will occur at this time.

For knitted fabrics, this situation means that the fabric is not woven well, or the fabric falls off the machine, or the pattern may be completely broken.

Wrinkling (refers to pre-shrinking wrinkle defect)-This kind of fabric defect refers to warp deformation caused by uneven wetting during pre-shrinking, generally due to poor nozzle. This kind of defect may appear as wavy fabric edge, or it may affect other areas of the fabric. In the case of using a sprinkler, wrinkles are usually eight to ten inches wide.

Reed pulled by mistake)-This situation means that one or more warp yarns are pulled by the reed, contrary to the pattern design.

Reed mark (refers to reed mark defect)-this is a kind of fabric defect caused by bending reed, which is characterized by slender stripes in the warp direction of the fabric.

Reed)-this is a kind of warp stripe defect caused by bad reed. Due to uneven yarn arrangement, light or heavy stripes may appear on the fabric. In addition, a bad reed will also wear the yarn and change its dyeing affinity.

Reedy)-This kind of defect is characterized by the appearance of reed patterns where there are striped defects. The reason for this phenomenon is that the reed is too loose, and it may also be due to the incorrect arrangement of the reed traction or the incorrect setting of the loom.

Rough)-This term is usually used to describe the rough or wrinkled appearance of fabrics caused by broken needles or feet.

Sanforize ripple (refers to wrinkle defect)-this kind of fabric defect is the washboard phenomenon caused by the thick interlining of pre-shrinking finishing machine not working normally.

Sanforize Pucker-This kind of fabric defect refers to warp deformation caused by uneven wetting during pre-shrinking, which is generally caused by poor nozzle. This kind of defect may appear as the wavy edge of the fabric, or it may affect other areas of the fabric. In the case of using a sprinkler, wrinkles are usually eight to ten inches wide.

This term is usually used to describe the rough or wrinkled appearance of fabrics caused by excessive preshrinking.

Scrimp)-This kind of defect is caused by printing the fabric in folded or folded state. When a fold or crease is opened or unfolded, the pattern is usually destroyed.