Appearance: Occurred in E/R blended fabrics. After dyeing, there were spots of oily droplets, slightly darker than normal parts. Observed with a magnifying glass, the plush in the dark part of the fabric, the tip shows a tiny bead, and more than normal plush.
Causes: This is caused by the uneven singeing. Spots are stained with dense spots. Plushs are not fully burned. They become melted at the tip and are strong in color, so they are more dense.
(2) Bad spots
Appearance: After dyeing, the surface of cloth appears dark clouds.
Causes: 1). The desizing is not sufficient, or the treated wax is removed and attached to the fabric. 2) When the bath dyeing bath ratio is too small, the heating rate is too fast, so that the staining liquid is in a gelled state.
(3) Refined spots
Appearance: In the scouring process, the non-fibrous material in the scouring-off fabric is combined with the scouring agent, and then the plush under the falling fabric is adhered and adhered to the surface of the fabric. The irregular yellow flake marks appear on the fabric surface. When the nails are lightly shaved, short piles and debris fall.
Causes: 1). The scouring agent is easy to condense at room temperature. 2). When scouring with a scouring kettle, the washing is insufficient or the washing temperature is low. 3). In the continuous scouring and scouring chamber there are deposits, or too much foam in the scouring tank and the roll surface is dirty.
(4) Drill holes
Appearance: The gray fabric is normal, and after the bleaching with hydrogen peroxide, the warp or weft yarn of the fabric is broken to form a small hole.
Causes: Rust adheres to the cloth surface, or iron ions are contained in the bleaching bath water. During the bleaching process of the fabric, hydrogen peroxide is rapidly oxidized to break the yarn.
(5) Color flowers
Appearance: The fabric has irregular shades of color.
Cause: The desizing of the pre-treatment project was not fully completed.
(6) fog
Appearance: Patchy stains, deep and shallow, contours are not obvious, shape and size are not the same, there is no concentration, and there is no certain rule.
Causes: 1) The fabric to be dyed is splashed into sewage or other medicines. 2) After the training and bleaching, they are not dried immediately, they accumulate on the truck for a long time, and some parts of the fabric are air-dried. 3) The greasy cloth is contaminated with oil stains. After the blank inspection, traces left after brushing with a strong detergent are used.
(7) color difference
Appearance: The dyed or printed fabric, the color of the finished product dyed, or the color of the printed pattern cannot be exactly the same as that specified.
Causes: 1) The sample used for the specified color sample is too small, and the exact same color is not achieved when the sample is color proofed. 2). Weighing dyes and auxiliaries is not accurate enough when preparing dyeing solutions or printing pastes. 3) The conditions of the process and the proofing were not fully cooperated, and no empirical modification was made.
(8) Cylinder color difference
Appearance: A large number of fabrics, fractional cylinders or several times a cylinder dyeing, non-stained in the same cylinder, different shades of colored light.
Cause: Each cylinder is of the same type, but its function will be slightly different. In the dyeing process, the conditions of each operation cannot be the same.
(9) Yin and Yang color
Appearance: dyed full-width fabric, the color of the front and back surfaces has a color difference.
Causes: 1) The bulge rolls out of the cloth and the direction of travel of the cloth is not in the same plane as the suction line. 2). The heat received on both sides of the fabric is different when it is pre-dried after pressing. 3). The wind speed on the two sides of the fabric is different during resin processing.
(10) Left and right color difference
Appearance: Full-width fabric, from the left side to the right side, the color gradually darkens or becomes lighter. Comparing the two cloth edges, there are significant differences in color.
Causes: 1) The pressure suction rate of the squeegee rolls gradually increases or decreases from left to right. 2). Roller roller or roller sculpting or poorly made print roller. 3). The pressure on the rollers of the printing roller or roller varies from left to right. 4). In the pre-drying, fixing or resin processing, the temperature or wind speed in the box is not the same.
(11) in the thin, Zhongnong
Appearance: The color of the fabric near the center of the cloth and near the center has a difference in depth. Causes: 1). In the open cross-dyeing machine, the curvature of the spreader device is not appropriate, so that the cloth dyeing rate is not uniform. The temperature inside the bath is inconsistent with the center. Add new staining fluid unevenly. 2) In the flow dyeing machine, the fabric circulation speed is slower and the heating rate is faster. 3) In the open width dyeing machine, the suction rate at the center and ends of the roll is inconsistent. Both the temperature and the wind speed at the time of drying are not uniform at both ends and at the center. In the continuous dyeing process, the tension on the cloth body is not uniform. 4). The center of the fabric that has been formed during the pre-processing process is inconsistent with the two sides. 5) When the roller or the Rodriguez prints, the center of pressure applied is inconsistent with the two ends. 6). The resin was not processed immediately after dyeing, or it was not completely dried after the resin was applied and accumulated for a long time.
(12) Color difference between the first and the end
Appearance: A group of fabrics containing several or several dozens of fabrics. After continuous dyeing under the same setting conditions, the cloths that begin to be applied to the end of the fabric are different in depth.
Causes: 1). In the pre-treatment process, there is a difference between desizing, scouring, bleaching, mercerizing, and stereotypes before and after a batch of fabrics. 2). In the open cross-rolling dyeing, the dyeing rate is not uniform with the combination of dyes, the guide cloth and roll method are not appropriate, the dyes are added wrongly, and the dyeing temperature is not properly controlled, which will cause the color difference between the first and the end. 3). In continuous dyeing, the pressure suction rate changes, the stability of the dyeing fluid is not good, and the temperature during drying gradually changes. 4) Dyes and additives used in combination have poor compatibility, and uneven layers of dye particles and water may occur. Due to capillary action, water enters the fiber first, causing the concentration of the dye solution to change, causing a color difference between the first and the end. 5). When dyeing with an ice dye, the dye will gradually hydrolyze during a long period of dip dyeing, and it will also cause a color difference between the first and the end.
(13) Transfection
Appearance: As the dyed fabric dries during drying, the moisture contained in the fabric evaporates, and the dye moves to the surface of the fabric as the water moves, causing a change in shade of the fabric surface.
Causes: 1). Pressurization rate is too large. 2) When the dyeing solution is used, the dye used is excessive, ie, the concentration of the dye solution is too high. 3). Dyeing time before dyeing is too long. 4). The drying rate is too fast. 5) No transfection inhibitor added, or insufficient amount added.
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