The Full Interpretation of Woven Fabric-Finishing after Printing and Dyeing-Defects

A Great Interpretation of Woven Fabric Printing and Dyeing
(1) Oil droplet stain.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; appearance: mostly occurs in E/R blended fabrics, after dyeing, there are oil droplet spots, which are slightly darker than the normal part. With a magnifying glass, the plush in the dense part of the fabric shows tiny beads at the tip, and more plush than that in the normal part.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; &
(2) immersion in bad spots
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; Appearance: After dyeing, the surface of the cloth shows dark clouds.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; cause of formation: 1) desizing, inadequate semen, or wax removed after treatment, and then attached to the fabric. 2. When dyeing in bath, the bath ratio is too small and the heating rate is too fast, which makes the dyeing solution gelatinized.
(3) Bleached Hole
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; Appearance: The embryo cloth is normal, after hydrogen oxide bleaching, the warp or weft yarn of the fabric surface is broken, forming small holes.
Nbsp; & nbsp; & nbsp; & nbsp; Cause of formation: there is rust on the cloth surface, or iron ions in the water used for bleaching bath. In the process of cloth bleaching, the yarn is broken by rapid oxidation with hydrogen peroxide.
(4) Skilteriness
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; appearance: the color of the cloth surface is irregular sheet.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; causes: desizing of pretreatment engineering, scouring has not been done thoroughly.
(5) fog patch (Mist)
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; appearance: patchy stains, deep or shallow, not obvious outline, different shapes and sizes, not centralized, nor certain rules.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; cause of formation: 1). fabric to be dyed is splashed into sewage or other medicines. 2. After scouring and bleaching, the fabric is not dried immediately and accumulated on the cloth truck for a long time. Some of the fabrics are watermarked by air-drying. 3. Embryo cloth is contaminated with oil, and the remnants after washing with a strong detergent during embryo examination.
(6) chromatic aberration
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; appearance: dyed or printed fabrics, the finished color of dyed fabrics, or the color of printed patterns are not exactly the same as those specified.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; cause of formation: 1. too small sample is used for the designated color sample, and the same color can not be made after proofing. 2. The weighing of dyes and auxiliaries is inaccurate in the preparation of dyeing solution or in the preparation of printing pulp. 3. The process and proofing conditions are not fully compatible and have not been experientially amended.
(7) cylinder chromatism
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; Appearance: Large quantities of fabrics dyed several times in fractional cylinder or cylinder, but not in the same cylinder, the difference of shade.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; cause of formation: although each cylinder is of the same type, its function will be slightly different. In the dyeing process, the conditions of each operation can not be the same.
(8) Yin Yang color
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; Appearance: dyeing full fabric, color difference on both sides.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; cause of formation: 1). the direction of cloth traveling is not in the same plane as the pressure-suction line when the press-dyeing roller leaves the edge. 2. The heat received on both sides of the fabric is different after pre-drying after dyeing. 3. The wind speed on both sides of the fabric is different when resin is processed.
(9) left and right chromatic aberration
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; Appearance: The color of the whole fabric gradually becomes darker or lighter from left to right edges. When the two edges are folded and compared, there is a significant difference in color.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; cause of formation: 1). the pressure absorptivity of the press roll gradually increases or decreases from left to right. 2) Improper engraving or fabrication of printing drum rollers or rollers. 3. Pressure on the rollers of printing drums varies from side to side. 4. When drying, fixing or resin processing, the temperature or wind speed of the left and right sides of the box are different.
(10) Listing
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; Appearance: The color of the fabric near the edge and near the center is different.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; causes: 1) in open cross-winding dyeing machine, the curvature of the spreading device is not suitable, which makes the suction dye rate of the cloth width inconsistent. The temperature in the dye bath is not consistent with that in the center. The addition of new dyes is not uniform. 2. In the liquid flow dyeing machine, the fabric circulation speed is slower, but the heating rate is faster. 3. In open continuous dyeing machine, the pressure and suction rates of the center and both ends of the roll are not consistent. Temperature and wind speed are not uniform at both ends and at the center during drying. In the continuous dyeing process, the tension of the cloth body is not uniform. 4. The center and sides of the fabrics formed during pretreatment are inconsistent. 5. When printing with Rolla or Rotary, the pressure applied is not uniform between the center and the ends. 6. After dyeing, the resin is not processed immediately, or the resin is not completely dried and accumulated for a long time.
(11) Tailing of Ending
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; Appearance: A group of fabrics containing several or dozens of pieces, after continuous dyeing under the same set conditions, begin to dye with the end of the fabric, the color is different.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; cause of formation: 1). In the pretreatment process, there are differences in desizing, scouring, bleaching, mercerizing and setting before and after the occurrence of a batch of fabrics. 2. In open cross-winding dyeing, the inconsistent dyeing rate of the combined dyes, inappropriate guide cloth and winding method, incorrect addition of dyes and inappropriate control of dyeing temperature will cause the first and last color difference. 3)During continuous dyeing, the pressure absorptivity changes, the stability of dye solution is poor, and the temperature changes gradually during drying. 4. Uneven layers of dye particles and water will occur if the dyes and the co-used additives are poorly miscible. Due to capillary action, water enters the fibers first, resulting in changes in the concentration of dye solution, resulting in color difference between the first and the last. 5. When dyeing with ice dyes, the dyes will hydrolyze slowly during the long time of dipping and dyeing, which will also cause the color difference between the end and the end.
(12) Migration
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; Appearance: As the dyed fabric evaporates during drying, the dyes move to the surface of the fabric with water, resulting in shallow changes in the color of the fabric surface.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; cause of formation: 1). Pressure absorptivity set at dyeing is too high. 2. When mixing dye solution, excessive dyes are used, that is, excessive concentration of dye solution. 3) Stay for too long before dyeing and drying. 4. The drying rate is too fast. 5. No migration preventive agent was added or the amount was insufficient.
(13) Warp Stripe (Yarn Texture Streak)
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; Appearance: Pick dyed shuttle fabric, the warp direction of the fabric has rainy stripes. Seriously, it can also be seen on the cloth surface of the embryo cloth. This kind of defect will show significant and insignificant differences because of the brightness of the inspection site, the direction of observation and the distance between them.
Cause of formation: 1) Because of the difference of yarn count, evenness, twist number and yarn cross-sectional shape, etc. 2. Improper dyes are selected, especially when dyeing green. 3. If polyester is used to process Silk fabrics, the desizing treatment before dyeing is improper, and there is paste in the part, which is less colorful and lighter in dyeing, and shows warp streaks.
(14) Barry Dyeing (Filling Band in Shade)
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; Appearance: In the weft direction of shuttle fabrics, or in the horizontal continuous loop of circular knitted fabrics, after dyeing, the color shows a deeper or lighter band.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; cause of formation: 1). woven embryonic cloth has close paths or sparse defects. 2. When knitting, yarn tension is uneven or the number of loops is uneven. 3. Silk chemical yarns with the same specifications and different batches are used in weaving. 4. Chemical fibers for knitting have uneven heating temperature in the process of filament processing.
(15) Dye Spot
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; appearance: 1). On the surface of dyed medium and light-colored fabrics, there are tiny color spots of the same color system. 2. On the surface of bleached or light-colored fabrics, there are tiny spots of other dyes.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & genesis: 1). Dye dissolves poorly, and there are still small particles that do not dissolve. 2. The dye flutters during the process of handling and falls on the fabric to be processed. 3. Do not clean the machinery and equipment, after dark processing, continue to process light color.
(16) Rope Mark
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; Appearance: When dyeing with rope, the fabric will shrink into rope shape, and after dyeing, the surface of the fabric will have irregular color wrinkles along the direction of cloth length.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; cause of formation: when dyeing with Wenqi or liquid flow dyeing machine, the fabric is not predefined or undershaped. In dyeing, the scroll bar fails to run. A sudden increase or decrease in temperature. The dyeing bath is too small. The fabric knots in the cylinder, etc.
(17) Padding Mark
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; Appearance: when shuttle fabric is open-die dyed, the fabric is warp folded between two rollers, and when passing through the pressure line, the pressure absorptivity varies due to the difference of thickness. The folded part is lighter than the normal part. Most of them occur at the head of two pieces of a fabric.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; cause of formation: 1). creases have been produced in the pretreatment process of the fabric to be dyed, and can not be completely eliminated in the setting process. 2. The expander of the feeding device of the press failed to open the fabric. 3. The seam between the piece and the piece is not good, and there are wrinkles or irregularities.
(18) Uneven Dyeing on Selvage
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; appearance: after dyeing, the edge of the fabric is different from the color of the fabric.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; cause of formation: 1). the fabric edge of embryo cloth is too loose or too tight. 2. The edge of fabric is clamped by high temperature splint before dyeing. 3) Edge curling occurs during dyeing. 4. When open cross-winding dyeing, the winding is uneven and the edge of the cloth is oxidized. 5. Inadequate reduction in open-end curing or urn dyeing. 6. The pressure absorptivity of the fabric edge and the fabric surface is not the same during open-die dyeing. 7. Washing after dyeing is insufficient and residual medicines at the edge of cloth are found.
(19) Fading of Selvage or Discoloration
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; appearance: the color of the finished fabric after dyeing and finishing is different from that of the normal fabric.  
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; cause of formation: 1) when resin is processed, the temperature of needle plate or splint is too high, and the dyes sublimate and escape. 2. When drying fabrics with rotary drum dryer, the temperature is too high and the edge of the fabric is too tight around the drum.
(20) Edge Mark
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; Appearance: refers to cylindrical knitted fabrics, which show abnormal dyeing at the turning position of both sides of cylindrical flat bending.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; cause of formation: 1). deterioration of oil additive during weaving. 2) The blastocyst is stored improperly or for too long, and the edge of the blastocyst is polluted by the action of air and sunlight. 3)When the cylinder is shaped, the temperature of the fixing frame is too high.
(21) drum pollution
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; Appearance: During dyeing and finishing of cloth, when passing through a cylindrical device, the surface of the cylinder is contaminated by dirty substances such as oil, chemicals, dyes and other contaminants. The shape is mostly small, and there is a certain distance between the two contaminants.
Cause of formation: 1). Oil stain on the guide roller. 2. The rollers are sticky with tar-like deposits or short fibers that fall off the fabric. 3. The drying cylinder is sticky with oil stains and dirt.
(22) Dyeing Stop Mark
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; appearance: along the weft or transverse direction of the fabric, there is a trace of 2 from 10 cm wide, darker or lighter than normal color, and its two sides are similar to watermarks.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; cause of formation: during normal operation period, when the machine suddenly stops running due to power failure, coiling or other mechanical failures, the fabric is clamped between two rollers, which occurs when dyeing or reducing fluid is pressed and absorbed.
(23) stain
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; appearance: finished fabrics have been packed, and after opening, the fabrics have deep spots of the same color.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; Causes: After dyeing and finishing, the fabric is packed in sealed packaging, because of the condensation of evaporating water vapor, the dyes and processors with weak wet fastness, which will cause spots to form. 　
 
(24) printing crease
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; Appearance: On the surface of printed fabric, the area with shuttle or strip shape along the longitude or longitude is not printed.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; cause of formation: when printing, the fabric surface creases and overlaps, and the covered part is not printed pattern. 　　
 
(25) Printing paste contamination
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; Appearance: Fabrics printed on white background are contaminated by very small amount of uniform printing paste, and most of them occur in rolled fabrics.
Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; cause of formation: 1). the mirror of printing roller is not enough and it is easy to adhere to printing paste. 2)The scraper is not in good contact with the printing drum, or the scraper is not sharply grinded. Black or dark patterns on a white background are most likely to occur.