Matters needing attention when dyeing with high temperature and high pressure dyeing machine

1. Selection of dyes When dyeing, try to choose varieties with good diffusivity and level dyeing properties, and choose dyes with relatively close dyeing performance when matching colors.
2. Reduction cleaning Reduction cleaning is an important part of removing floating color. After reduction cleaning, the color is slightly lightened. At the same time, the rubbing fastness and light fastness are improved.
3. Prevention of tar spots The so-called tar spots are viscous substances formed in the dye solution, and the main ingredients are dye dispersants and polyester oligomers. Polyester oligomer is polyester polycondensation, it will ooze out 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. The measures to prevent tar spots are: (1) Strengthen the pre-treatment of fabrics. (2) Increase the dye bath ratio. (3) Apply high temperature and high pressure dispersant. (4) Use high-temperature drainage to avoid crystallization after the dye is cooled. (5) Shorten the equipment cleaning cycle.
4. Preparation of dyeing liquid When preparing the dyeing liquid, first use a small amount of cold water to make the dye into a slurry, and then dilute it with room temperature water. Note that the temperature of the diluting water should not be too high, higher than 60 degrees, and the quilt of the disperse dyeing will be damaged. In addition to coagulation, the dye can also be prepared by dusting, that is, the dye is slowly sprinkled into cold water under high-speed stirring, and it is not suitable to leave it for a long time after the dyeing bath is prepared. The same feed needs to be stirred slowly with a stirrer to prevent precipitation.