(1) Gasoline Spot Appearance: It mostly occurs on E/R blended fabrics. After dyeing, there are oil drop-shaped spots, which are slightly darker than normal areas. Observe with a magnifying glass, the tips of the velvet in the dark-colored areas of the fabric appear in the shape of tiny beads, and there are more velvet than the normal areas. Cause: This is caused by uneven singeing. In the heavily dyed areas, the plush cannot be fully burned out and becomes a melted mass at the tip. It has strong color absorption, so the dyeing is thicker. (2) Fuzz, Nap Appearance: After dyeing and finishing, the fabric still has a slight plush on the surface, which is different from the color of the cloth grain. Cause: 1). The singeing is not sufficient and the hairiness on the cloth surface is not completely burned out. 2). When dyeing using a liquid flow dyeing machine, the jet from the nozzle is too strong. (3) Inperfect Penetration Of Dye Appearance: The dyed cloth surface appears in the shape of dark and light clouds. Causes: 1). Insufficient desizing and seminal slurry, or wax and other substances removed after processing are attached to the fabric. 2). During bath dyeing, the bath ratio is too small and the heating rate is too fast, causing the dyeing liquid to gel. (4) Scouring spots Appearance: During the scouring process, the non-fibrous substances in the fabric dropped from the scouring are combined with the scouring agent, and then mixed with the lint dropped from the fabric, and adhere to the surface of the fabric. There are irregular flaky yellow marks on the cloth surface. If you scratch it lightly with your fingernail, short lint and debris will fall off. Reasons: 1). Refining agent is easy to condense at room temperature. 2). When refining in a refining kettle, the water washing is not sufficient or the washing temperature is low. 3). In continuous refining, there are sediments accumulated in the refining chamber, or there is too much foam in the refining tank and the roller surface is unclean. (5) Bleached Hole Appearance: The gray cloth is normal. After hydrogen peroxide bleaching, the warp or weft yarns on the cloth surface are broken, forming small holes. Cause: There is rust on the cloth, or the water in the bleaching bath contains iron ions. During the bleaching process of the cloth, it oxidizes rapidly with hydrogen peroxide and causes the yarn to break. (6) Skilteriness Appearance: The cloth surface has irregular flakes of color. Cause: The desizing and refining of the pre-treatment project were not completely completed. (7) Mist (Mist) Appearance: flaky stains, varying in depth and shallow, with unclear outlines, varying shapes and sizes, not concentrated in locations, and with no certain rules. Causes: 1). The fabric to be dyed was splashed with sewage or other chemicals. 2). If the fabric is not dried immediately after bleaching and is accumulated on the cloth cart for a long time, some fabrics will have air-drying watermarks. 3). The embryo cloth is stained with oil, and the traces left after scrubbing with a strong detergent during embryo inspection. (8) Color difference Appearance: For dyed or printed fabrics, the color of the finished product or the color of the printed pattern may not be exactly the same as the specified one. Reasons: 1). The sample used for the specified color sample is too small, and the color matching after proofing cannot be exactly the same. 2). When preparing dyeing liquid or printing paste, weighing dyes and auxiliaries is not accurate enough. 3). The manufacturing process and sampling conditions did not fully match, and no empirical corrections were made. (9) Vat-specific color difference Appearance: For large batches of fabrics dyed in several vats or in one vat, if they are not dyed in the same vat, there will be differences in the shades of color. Cause: Although each cylinder has the same type, its functions will be slightly different. In the dyeing process, the conditions of each operation are not the same. (10) Yin and yang color Appearance: dyed full-width fabric, there is a color difference between the front and back sides. Reasons: 1). The press-dyeing roller comes out of the edge of the cloth, and the traveling direction of the cloth is not in the same plane as the suction line. 2). When pre-drying after press dyeing, the heat received by both sides of the fabric is different. 3). During resin processing, the wind speeds experienced by both sides of the fabric are different. (11) Color difference between left and right Appearance: The color of the full-width fabric gradually becomes darker or lighter from the left edge to the right edge. Comparing the two fabric edges, there is a significant difference in color. Reasons: 1). The suction rate of the roller of the dyeing machine gradually becomes larger or smaller from left to right. 2). The printing roller roller or roller outline is poorly engraved or made. 3). The pressure on the left and right sides of the printing roller or steel roller varies. 4). During pre-drying, color fixing or resin processing, the temperature or wind speed in the left and right sides of the box is different. (12) Medium thin, medium thick (Listing) Appearance: There is a difference in the color of the fabric near the edge and near the center. Causes: 1). In the open-width cross-winding dyeing machine, the curvature of the spreading device is inappropriate, causing the cloth to absorb dye liquor at an inconsistent rate. The temperature in the dye bath is inconsistent at both ends and in the center. Adding new dye solution is uneven. 2). In liquid flow dyeing machines, the fabric circulation speed is slow and the heating rate is fast. 3). In the open-width continuous dyeing machine, the suction rate in the center of the roller is inconsistent with that at both ends. During drying, the temperature and wind speed are not uniform at both ends and in the center. During the continuous dyeing process, the tension on the cloth body is uneven. 4). The center of the fabric formed during pre-processing is inconsistent with both sides. 5). When roller or roller printing is performed, the center of the pressure applied is inconsistent with the two ends. 6). The resin is not processed immediately after dyeing, or the resin is not completely dried after application, causing accumulation for a long time. (13) Tailing of Ending Appearance: After a group of several or dozens of pieces of fabric are dyed continuously under the same set conditions, the colors of the fabrics dyed at the beginning and end will be different in shades. Reasons: 1). During the pre-treatment process, a batch of fabrics undergoes differences in desizing, scouring, bleaching, mercerization, shaping, etc. before and after. 2). When dyeing open-width rolls, use a combination of dyes.The air is not completely removed, so the fabric is in contact with the air. 5).During the hot steaming process, the temperature inside the steamer is not uniform. 6). The oxidation of the dye occurs incompletely. 7). After dyeing or printing and before color development, the fabric is exposed to direct sunlight. (55) Resin spots Appearance: The finished fabric processed by resin has dry and solid resin spots on the fabric surface. It looks shiny and reflective, and feels smooth and stiff when touched. Cause: During the resin processing process, the resin is not fully and evenly dissolved. The fabric passes through the resin slurry tank and adheres to the cloth surface. It is then squeezed by the roller and forms a sheet that adheres tightly to the cloth surface. (56) Surface resin Appearance: Resin-processed finished product. The resin floats on the cloth surface. If you lightly scratch it with your fingernail, it will produce scratches. Cause: During resin processing, the resin pressure absorption rate is too high and the temperature at which drying begins is too high. (57) Pilling: Appearance: The finished fabric processed by resin has pilling on the surface of the fabric. Woolen fabrics, polyester short fiber products, and blended fabrics with polyester short fiber are more likely to occur. Reasons: 1). Before the resin processing, the surface of the fabric still has a lot of hairiness. 2). During resin processing, no anti-pilling agent or appropriate smoothing agent is added to the resin liquid. (58) Split yarn Appearance: Weft knitted fabric, one row of loops is pulled apart to become straight. Cause: During the shaping or resin processing of weft knitted fabrics, the fabric feeding direction is wrong, causing a row of loops to be straightened. (59) The cloth surface is shiny. Appearance: The cloth surface is too flat and has undesired brightness, which mostly occurs in chemical fiber knitted fabrics. Cause: During resin processing, the tension applied to the fabric is too high. (60) Uneven cloth surface Appearance: The entire length of the fabric, about 1 yard long, is laid out flat on a platform. There will be unevenness on the fabric body, which mostly occurs in weft-knitted fabrics. Cause: Poor shaping or resin processing results in uneven longitudinal and transverse shrinkage of the fabric. (61) Poor elasticity Appearance: The stretchable knitted fabric cannot return to its original shape after being slightly stretched vertically and horizontally, and wrinkles appear. Reasons: 1). The extra silk used in weaving has poor crimp fastness. 2). When setting the shape or resin processing, the temperature is set too high, or the fabric is heated at high temperature for too long, causing the processed yarns in the fabric to lose part of their recovery properties. (62) Paper Like Appearance: The fabric surface is smooth, slightly stiff, and less stretchable, just like paper. Cause: The chemical filamentous fibers used for fabrics have a very low shrinkage rate in boiling water, for example, only 2 to 3%. Therefore, during the fabric processing process, they cannot fully shrink, giving the fabric a papery feel.
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