It is important to pay attention to the quality of water when using dyeing auxiliaries
Water quality is an important factor that affects the processing quality. It can be said that the quality of printing and dyeing is difficult to control, and most of it is caused by poor water quality.
Due to the differences in the water source, the impurity content, hardness, other metal ions, chromaticity, turbidity, and other pollutants in the water vary greatly. For example, if only the hardness is considered, the impact on dyeing and finishing process is relatively small if it is less than 100ppm. However, some factories use hard water above 300ppm. Although it is only used for washing, it will also reduce the color fastness. If used for bleaching, it will cause calcium spots, rough hand feel, reduced whiteness, reduced wool effect, uneven dyeing, etc. If used for dyeing with hard water, it is necessary to reduce the solubility of the dye, causing dye spots, reduced color fastness, affecting the brightness of the color, changing the even dyeing performance, and affecting the color reproduction, etc.
The quality of fabric pre-treatment must be strictly controlled when using dyeing auxiliaries
Excellent pre-treatment is the key to ensuring the quality of the finished product for printing and dyeing. If the quality of pre-treatment cannot be guaranteed, it is impossible to obtain affirmative quality of the finished product.
The quality of pre-treatment should be clean and uniform. Clean means removing impurities, and at least 80% of the sizing material should be removed. The removal of fiber accompanying substances such as oil, wax, pectin, and proteins should be at least 80%. The removal of pigment should be determined according to the processing requirements.
Currently, the only criterion for evaluating the quality of pre-treatment in printing and dyeing factories is capillary effect, which is not scientific. If there are a lot of surface active agents with rewetting on the fabric, it will also produce false effect, leading to a high value of capillary effect. Therefore, before measuring the capillary effect, it is best to wash the fabric with hot and cold water, wash away the rewetting agent, dry it and keep it moist, and then measure the capillary effect.
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