Factors affecting the work of high temperature and high pressure dyeing machine
Oct 13, 2021
1. Prevention and repair of fold prints (chicken paw prints, eyebrow wrinkles): dyeing on the overflow jet dyeing machine, because the fabric is basically under tension-free conditions, practice has proved that there are five main factors for forming fold prints:
① Potential factors in yarn weaving.
②The thermal shrinkage of two or more fibers that make up the fabric is inconsistent.
③The size of the dyeing bath ratio.
④The dyeing temperature rises/drops too fast.
⑤Choose the machine to process according to the dyeing and finishing products and requirements.
2. Repair of color flowers: In addition to mechanical problems, the color flowers on the overflow jet dyeing machine are usually caused by the dyeing of light and medium colors, the amount of dye is small, and the leveling agent is not effective, and the dyeing process heats up too fast. There are many reasons such as mixing materials and inadvertently adding materials, which can be exhausted.
3. Repair of dye spots: dyeing various polyester and its blended fabrics on a high temperature and high pressure overflow jet dyeing machine often produces dye spots. Someone has done an analysis of the formed dye spots, and it is roughly on polyester. The oligomers account for the majority, about 50%, the dispersant in the dye is about 30%, and the impurities such as fiber chips are about 20%. It can be seen that, first of all, the treatment or alkali reduction of polyester and its blended fabrics before dyeing is very important (to be discussed separately). Generally, the weight reduction and impurity removal rate of the pre-treated fabric is about 10% or more. Only when this number is reached, can it be possible to reduce the further dissolution of impurities and the aggregation of other substances during the dyeing process; secondly, sometimes it is not so much to choose For good disperse dyes, it is better to use good additives. In fact, the diffusibility, solubility, directness, levelness, and even color fastness of dyes can only be compensated and improved by adding additives.