What are the reasons that affect the dyeing OK rate?

Effects of dyes

1. Different batches of dyes have batch differences, and each batch of dyes must be tested for batch differences;

2. Improper storage and management of dyes in the material room, which may cause dyes to be damp or cross-colored;

3. Improper management of the life of mother liquor in the laboratory and failure to replace it on time;

4. The concentration of the dilution ratio of the dye mother liquor in the laboratory is not good, and the manual straw is not properly controlled;

5. Select dyes with close compatibility. In the process of color matching, there is a phenomenon of competing dyeing, resulting in color difference between the front and the back.

Influence of additives

1. Pay attention to the difference of different batches of additives, in addition, pay attention to stirring when taking each barrel of additives;

2. Different dosages of additives will cause shade changes and final fixation amount. Pay attention to the control of the dosage of additives between laboratory samples and workshop production.

Chromatic aberration caused by grey fabric

1. The grey fabrics to be sampled should be consistent with the batches of fabrics produced in bulk.

2. The gray fabric of the small sample is stored for a long time, and it is greatly affected by moisture or gas, which causes the color difference of the size of the sample. The grey cloth of the laboratory should be changed frequently, and it should be wrapped in a film, completely separated from the dyeing material in the laboratory, and protected from the influence of bad gas.

Color difference caused by process conditions

1. Workshop production must strictly implement the process issued by the laboratory.

2. Bath ratio, dyeing (heat preservation) time and dyeing pressure have an important influence on coloring. The dyeing bath ratio is different, the shade difference is obvious. If the dyeing (heat preservation) time is prolonged at a certain temperature, the dye uptake will increase significantly.

The effect of finishing on the shade

1. The finishing of the laboratory and the workshop is not unified, and different finishing processes have different degrees of influence on the shade. For example, temperature control, the use of fixing agent, etc., will seriously affect the color light result.

2. There are differences in the finishing of the laboratory and the workshop, and no corresponding adjustments have been made.

The effect of water quality on chromatic aberration

1. The quality of the water used for making small samples should be the same as that used for mass production.

2. There may be differences in water quality in different periods, including impurities and content, PH value and hardness, etc. These differences will also cause color difference. For light colors and white, soft water should be used as much as possible to reduce the impact of water quality.

Machinery and equipment impact

1. The weighing accuracy is not enough, and the accuracy of the laboratory weighing balance is not good for a long time, especially for the small sample weighing, the error of which has a more obvious impact on the large sample.

2. Inaccurate indication of dyeing vat instrument. Including instrument failure, instrument not calibrated according to regulations, air pressure leakage, etc.

Man-made influence

1. The operation of the staff is not carried out according to the regulations. This mainly refers to the cultivation of employees' sense of responsibility and conscience, while maintaining their stability (proficiency, experience and technology accumulation related to minimizing mistakes), etc.

2. It involves all aspects of human resource management issues.