Precautions for dyeing in high temperature and high pressure dyeing machine
Dec 04, 2021
In order to avoid stains, stains, stains, and other defects due to improper process operation and poor operation, the following items should be paid attention to when dyeing with high temperature and high pressure dyeing machines:
1. Dye selection When dyeing, try to choose varieties with good diffusibility and level dyeing properties, and use dyes with close dyeing properties when matching colors.
2. Reduction cleaning Reduction cleaning is an important part of removing floating color. After reduction and cleaning, the color is slightly lighter. 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, and 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) Adopt high-temperature drainage to avoid crystallization of the dye 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. For agglomeration, in addition to the above preparation, the dye can also be prepared by dusting method, that is, slowly sprinkle the dye into cold water under high-speed stirring, and 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.