Big interpretation of woven fabric printing and dyeing
01 Oil droplets stain spots
Appearance: It mostly occurs in E/R blended fabric. After dyeing, it has spots like oil drops. The color is darker than normal parts. Observed by magnifying glass, the tip of the plush in the thick colored part of the fabric showed a small bead shape, and more than the normal part of the plush.
Cause: This is due to uneven hair burning, dyeing spots in the thick color parts, the plush failed to fully burn, at the tip into a melting mass, strong color absorption, so the dye is strong.
02 Penetration of bad spots
Appearance: After dyeing, the cloth surface is in the shape of clouds.
Causes: 1). Deplasmic, refined pulp is not sufficient, or wax removed after treatment, and then attached to the fabric. 2). The bath ratio is too small and the heating rate is too fast during bath dyeing, which makes the dyeing solution appear gelatinized.
03 Bleached Hole. Ached hole.
Appearance: The blank cloth is normal. After being bleached by hydrogen oxide, the warp or weft yarns on the cloth surface are broken and small holes are formed.
Cause: There is rust on the cloth surface, or there is iron ion in the bleaching bath water. During the bleaching process of the cloth, the yarn will be oxidized with hydrogen peroxide and break.
04 Coloured flowers (Skilteriness)
Appearance: The cloth surface has irregular flaky color shades.
Cause: The desizing and refining of the pre-treatment project were not completed thoroughly.
05 Mist (Mist)
Appearance: flaky stain spots, deep and shallow, not obvious outline, different shapes and sizes, the location of occurrence is not concentrated, and there is no definite rule.
Causes: 1). The fabric to be dyed is splashed with sewage or other drugs. 2). After practice and bleaching, it is not dried immediately, and it is piled on the cloth cart for a long time, and some of the fabric will be air-dried and watermarked. 3). The embryo cloth is contaminated with oil, which is the residue after being scrubbed with a strong stain remover during embryo inspection.
06 The color difference
Appearance: Dyed or printed fabric, dyed in a finished color or printed pattern that is not exactly the same as specified.
Cause: 1). The sample used for the specified color sample is too small, and the exact same color matching cannot be achieved after making the sample. 2). When preparing dyeing solution or modulating printing paste, it is not accurate enough to weigh dye and auxiliary agent. 3) The conditions of manufacturing process and proofing are not fully compatible, and no empirical correction has been made.
07 Cylinder color difference
Appearance: Large quantities of fabric, fractional cylinder or several times in one cylinder dyeing, not in the same cylinder dyeing, there are different shades of light.
Cause: Although the cylinder is the same type, but its function will be slightly different. In the dyeing process, the conditions of each operation cannot be the same.
08 Yin and Yang color
Appearance: Dyed full width fabric, front and back side color difference.
Causes: 1). The press dyeing roll is out of the cloth edge, and the cloth travel direction is not in the same plane as the press suction line. 2). The heat received by the two sides of the fabric is different after press-drying. 3) The wind speed on both sides of the fabric is different when the resin is processed.
09 Left and right color difference
Appearance: Full-width fabric, gradually darkening or lightening from left edge to right edge. When the two cloth edges are compared, there is a significant difference in color.
Causes: 1). The pressure absorption rate of the roller of the press dyeing machine gradually increases or decreases from left to right. 2) The printing roller or roller is not good at engraving or making. 3). The pressure on the roller or around the rolling steel varies. 4). When pre-drying, fixing or resin processing, the temperature or wind speed in the box is not the same.
10 Medium thin and concentrated (Listing)
Appearance: The color of the fabric near the edge and near the center, there are differences in shades.
Causes: 1). In the open folding dyeing machine, the curvature of the spreading device is not suitable, so that the dyeing liquid absorption rate of the cloth is inconsistent. The temperature in the dye tank is not consistent with that in the center. The new dye is not evenly added. 2) In the liquid flow dyeing machine, the fabric circulation speed is slow, but the heating rate is faster. 3). In the open-width continuous dyeing machine, the pressure absorption rate of the central roll and the two ends is inconsistent. Drying temperature and wind speed at both ends and the center of the uneven. During the continuous dyeing process, the fabric is subjected to uneven tension. 4) The center of the fabric formed during pre-processing is inconsistent with both sides. 5). For Lola or Lola printing, the pressure applied is not consistent between the center and the ends. 6). After dyeing, resin processing is not immediately followed, or after applying resin, it is not completely dried and accumulated for a long time.
11 Tailing of Ending (Tailing of Ending)
Appearance: A group of several or dozens of pieces of fabric, dyed continuously under the same conditions, the beginning and the end of the dyed fabric, the color of the different shades.
Causes: 1) In the pre-treatment process, there are differences between a batch of fabrics before and after desizing, refining, bleaching, mercerizing, shaping, etc. 2). In the open-width cross-coiling dyeing, the dyeing rate of the combined dye is inconsistent, the guiding cloth and the coiling method is inappropriate, the dye addition is wrong, and the dyeing temperature is not properly controlled, which will cause the color difference between the beginning and the end. 3). During continuous dyeing, the pressure absorption rate changes, the stability of dyeing solution is poor, and the temperature changes gradually during drying. 4) If the miscibility of dyes and additives used together is poor, the inhomogeneous layer of dye particles and water will occur. Due to capillary action, water enters the fiber first, resulting in the change of the concentration of the dye solution, resulting in the color difference between the beginning and the end. 5). When using ice dye for dyeing, the dye will hydrolyze slowly in the long dyeing process, which will also cause the color difference between the beginning and the end.
Appearance: When the dyed fabric is dried, the water in the fabric evaporates, and the dye moves to the surface of the fabric with the water moving, so that the color of the fabric surface changes.
Causes: 1). The pressure absorption rate is set too high when pressing and dyeing. 2). When mixing dye solution, excessive dye is used, i.e. the concentration of dye solution is too high. 3). Placing time after dyeing and before drying is too long. 4). The drying speed is too fast. 5). No anti-dye agent is added, or the amount is insufficient.
13 Warp Stripe (Warp Stripe, YarnTexture Streak)
Appearance: Woven fabric, with rain - like stripes in the warp direction. In severe cases, the cloth surface of the embryo can also be seen. Such defects may show significant or insignificant differences due to the brightness and darkness of the inspection site, the direction and distance of observation.
Cause: 1). It is formed by the difference of yarn number, evenness, twist number and cross section shape. 2). The selection of improper dyes, especially when dyeing green, is more likely to occur. 3). If it is polyester processed silk fabric, it is not properly desizing before dyeing, and there are local residual pastes. When dyeing, it is not colored, the color is lighter, and there are meridional stripes.
14 Barry Dyeing (Filling Band in Shade)
Appearance: In the weft direction of woven fabric, or the transverse continuous loops of circular knitted fabric, the color of the dyed darker or lighter band.
Causes: 1) The woven embryo cloth has dense or thin defects. 2) When knitting fabrics are woven, the feeding tension is not uniform, or the number of hair rings is not uniform. 3) Filamentous chemical fiber yarns with the same specifications and different batch numbers are used in weaving. 4) Knitting chemical fiber, in the process of silk processing, heating process temperature imbalance.
15 Dye Spot
Appearance: 1). There are tiny color spots of the same color on the cloth surface of medium and light colored fabrics. 2). On the surface of bleached or light-colored fabrics, there are tiny dots of other dyes.
Cause: 1). The dye is poorly dissolved, and there are still small particles not dissolved. 2). The dye flies up during transportation and falls on the fabric stored for processing. 3). The mechanical equipment has not been cleaned, and after the dark processing, continue to process the light color.
16 Rope Mark. Rope mark.
Appearance: The fabric shrinks into a rope shape during rope dyeing. After dyeing, the cloth surface has irregular color wrinkles along the length of the cloth.
Cause: When dyed by Wenqi or liquid flow dyeing machine, the fabric is not predetermined or not set enough. The rolling bar stops running due to failure during dyeing. Rapid warming or cooling. Dye bath ratio is too small. Fabric in the VAT knot, etc.
17 Padding Mark Padding mark
Appearance: When the woven fabric is pressed with open width, the fabric is folded longitudinately between two rollers. When passing through the pressure line, the pressure absorption rate is different due to the difference in thickness. The folded area is slightly lighter than normal. Occurs mostly on two ends of a piece of fabric.
Causes: 1). Creases have been produced in the pre-treatment process of the fabric to be pressed and dyed, which cannot be completely eliminated during the shaping. 2). The diffuser of the feeding device of the press dyeing machine fails to open the fabric. 3) The seams between the leather and the leather are not good, and there is a phenomenon of shrinkage or untidiness.
18 Poor Dyeing on Selvage
Appearance: After dyeing the fabric, the edge of the fabric has a different color than the surface.
Causes: 1). The edge of the germ cloth is too loose or too tight. 2) Before dyeing, the cloth edge is held by high temperature splint. 3) Curling occurs at the edge of the cloth during dyeing. 4). In the process of open-width crossover dyeing, the winding is uneven and the cloth edge is oxidized. 5). The reduction is insufficient in the process of dyeing with open open folded vulcanization or urn dye. 6). The pressure absorption rate of the cloth edge and the cloth surface is not consistent during open pressure dyeing. 7). Washing after dyeing is not sufficient, and drugs remain in the cloth edge.
19 Cloth edge Discoloration (Fading of Selvage or Discoloration)
Appearance: After dyeing and finishing the finished fabric, the color of the cloth edge is different than the normal shade.
Causes: 1). Resin processing, needle plate or splint temperature is too high, dye sublimation occurs to escape. 2). When using rotary cylinder dryer to dry the fabric, the temperature is too high, and the cloth edge is too tight around the cloth cylinder.
20 Edge Mark of cloth
Appearance: It refers to the cylindrical knitted fabric, the corner of both sides of the cylindrical flat fold, showing abnormal dyeing phenomenon.
Cause: 1). The deterioration of the oil added during weaving. 2). The blank cloth is stored improperly or for too long, and the cloth edge is changed or polluted by the action of air and sunlight. 3) When the cylinder is shaping, the temperature of the shaping frame is too high.
21 Pollution of drum
Appearance: In the process of dyeing and finishing the cloth, after the cylindrical device, due to the unclean surface of the cylinder, such as sticky oil, chemicals, dyes and other dirty things, pollution to the cloth surface. Most of the shapes are small sheets, and there is a certain distance between the two contamination sites.
Cause: 1). There are oil stains on the cloth guide roller. 2) The press roller is stuck with tar-like lake, or short fibers falling off the fabric and other filth. 3). The drying cylinder is sticky with oil stains and filth.
22 Dyeing Stop Mark (Dyeing Stop Mark)
Appearance: A 2 ~ 10 cm wide mark along the weft or transverse direction of the fabric, darker or lighter than normal, with water-like marks on both sides.
Cause: When the machine stops running suddenly due to power failure, cloth rolling or other mechanical failures during the normal operation period, the fabric is clamped between two rolls, which occurs when the dyeing solution or reducing solution is pressed.
Appearance: The finished fabric that has been packaged has dark spots of the same color after opening.
Cause: The dyed and finished fabric is packed in a sealed package. Due to condensation of evaporation and water vapor, the dye and processing agent with weak fastness to wet will move and form speckled stains.
24 Crease of print
Appearance: On the printed fabric surface, the area with spindle or strip shape along the warp or longitudinal direction is not printed.
Cause: During the printing process, the fabric surface folds and overlaps, and the covered part is not printed with a pattern.
25 Printing slurry cylinder pollution
Appearance: Fabric printed on white background is contaminated by a very small amount of printing paste very evenly, mostly in rolled-out fabric.
Cause: 1). The mirror of the printing roller is not enough, and it is easy to adhere to the printing pulp. 2). The scraper is not in good contact with the printing drum, or the scraper is not often trimmed and not sharp enough. Black or dark patterns on white background are most likely to occur.