Analysis of Common Defects of Jigger Dyeing Machine

1. Head print: The whole silk surface has dark color at both ends.

Causes: ① The seam is too wide and thick, and it is squeezed after being rolled on the roller. ②The shaft is too tight, resulting in excessive tension. ③The guide silk is too short. ④The color difference between the guide silk and the dyed fabric is too large. ⑤The texture of silk and dyed fabrics are different.

Prevention method: the seam head should not be too wide, cut a few knives at the seam, so as not to cause water accumulation. ②Adjust the tension appropriately, and the fabric will not slack and sag. ③The guide silk should not be too short. ④ The color difference between the guide silk and the dyed fabric should not be too large.

2. Shade head: The color of both ends of the silk has shades.

Cause: ① The guide silk is not clean. ②Dyeing process did not add dyes in sequence according to their performance. ③Some dyes are not covered during dyeing. ④ The temperature is not properly controlled, and the temperature when it first enters the cylinder is different from the later temperature. ⑤The dye solution on the silk is rolled up on the roller and pressed out, and penetrates into the silk area to cause deep head.

Prevention method: ①Keep the guide silk clean. ②In the dyeing process, feed in order according to the performance of the dye. ③Add a cover when dyeing. ④Strictly control the temperature. ⑤The guiding silk and dyeing material are unified.

3. Light and dark sides: the color of the side mouth is different from the color of the middle.

Cause: ①The fabric width is different when it is rolled. ②The ones that should be covered during the dyeing process are not covered. ③ Improper selection of dyes. ④The curvature of the stretch frame is too large. ⑤There is a temperature difference between the edge of the fabric and the middle temperature. ⑥The pH value between the edge and the middle of the fabric is different.

Prevention method: ①The fabric width should be neat when entering the roll. ②Choose dyes with similar dyeing temperature. ③The arc of the stretch frame should not be too large. ④ Strengthen the pre-treatment to keep the pH of the entire silk surface consistent.

4.Wrinkle strip: by straight wrinkle printing.

Causes: ① The seam is not flat and the rolling is not neat enough, and it is flat. ②The width of the green silk varies. ③The impact of the water heater is too large. ④ Excessive tension. ⑤The stretch frame is not level. ⑥The yarn ends on the stainless steel roller at the bottom of the cylinder are too much twisted.

Prevention method: ①The seam head is flat and straight. ②The width of the door is aligned. ③The boiling steam should not be too large. ④The tension adjustment is moderate. ⑤ Keep the stretch frame level. ⑥ Do a good job of cleaning the cylinder.

5. Weft skew: The weft thread is skewed.

Causes: ①The gestures of fabric entering the cylinder are different. ② Water heater shock during boiling.

Prevention method: ①The gesture of fabric entering the cylinder should be even. ②The water tank should not be large when dyeing.

6.Pine board seal: It is in the shape of the annual pattern of the tree after sawing.

Causes: ① The tension of the fabric is too high and the temperature is too high when the fabric is rolled up.

Prevention method: When the fabric is rolled up, the tension should not be too large, and it should be rolled up on cold water.

7.Color flowers: different shades of color.

Cause: ①The dyeing water level is too small. ②The dye accelerant is added too fast. ③The temperature was not lowered when the dye was added in the middle of the feed. ④ The temperature rises too fast during high temperature and high pressure dyeing. ⑤The content of alkali sulfide is insufficient when setting sulfur dyes.

Prevention method: ①The water level of dyeing effluent should not be too small. ②The dye accelerant must be added in batches halfway (except for reactive dyes). ③When adding dyes or dye accelerators in the middle, the water heater must be turned off first, and then added after cooling down. ④The temperature rise is well controlled after 80℃. ⑤When setting sulfur dyes, the alkali sulfide is not less than 4g/l.

8. Irregular dark spots on the silk surface.

Causes: ① The dye concentration is too high and not fully dissolved. ② Excessive electrolyte consumption. ③Unclear water after enzyme treatment and dyeing. ④ Anion and cation react to produce precipitation. ⑤ The cleaning is not done well. ⑥The dye particles fly and stain the raw silk. ⑦ Too much singeing of polyester/cotton fabric. ⑧ The temperature of the dissolving disperse dye water is too high. ⑨ Too little dispersant.

Prevention method: ①Use the dye after filtering with a sieve. ②The dye accelerant is added in batches halfway. ③The effluent must be clean after enzyme treatment or dyeing. ④Different baths for anion and cationic dyes or additives (the same bath plus anti-precipitation agent). ⑤Keep the equipment clean. ⑥The dye needs to be dissolved before entering the workshop. ⑦Control the singe well. ⑧ Disperse dyes are dissolved in cold water and filtered into the tank. ⑨Appropriate use of dispersant.

9. Color profile: The silk surface presents a horizontal profile of different shades of color.

Cause: mechanical failure to stop.

Prevention method: carefully check whether all parts of the machine are operating normally before driving.

10. Color difference: the color difference between rolls.

Causes: ①The process conditions are not uniformly controlled. ②The floating color of reactive dyes is not sufficiently removed. ③There is no strict verification.

Prevention method: ①Strictly control the process conditions. ②Reactive dyes fully remove floating colors. ③ Strictly check samples.