Matters needing attention when dyeing with high temperature and high pressure dyeing machine
Jan 29, 2022
In order to avoid color stains, stains, stains, and other defects due to improper process operation and poor operation, the following items should be paid attention to when dyeing in the high temperature and high pressure dyeing machine:
1. Dyes selection When dyeing, try to choose varieties with good diffusibility and level dyeing properties, and dyes with similar dyeing properties should be used when color matching.
2. Reduction cleaning Reduction cleaning is an important part of removing floating color. After reduction and cleaning, the color fades slightly. At the same time, friction fastness and light fastness are improved.
3. Prevention of tar spots. The so-called tar spots are viscous substances formed in the dyeing solution. The main ingredients are dye dispersants and polyester oligomers. Polyester oligomer is a polycondensation of polyester, it will ooze from the fiber and flow into the dye solution to adhere to the surface of the fiber during the high temperature and long-term dyeing process.
Measures to prevent tar spots include: (1) Strengthen fabric pretreatment. (2) Increase the dyeing bath ratio. (3) Application of high temperature and high pressure dispersant. (4) Use high-temperature drainage to prevent the dye from crystallizing after cooling. (5) Shorten the equipment cleaning cycle.
4. Preparation of the dye solution When preparing the dye solution, first use a small amount of cold water to make the dye into a paste, and then dilute it with room temperature water. Note that the temperature of the diluting water should not be too high. If it is higher than 60 degrees, the disperse dye quilt will be damaged. In addition to the above preparation, the cohesion dye can also be prepared by dusting method, that is, slowly sprinkle the dye into cold water under high-speed stirring. It is not suitable to leave the dye bath for a long time after preparation. The same feed needs to be stirred slowly with a stirrer to prevent precipitation.