NEWS
Precautions for dyeing with high-temperature and high-pressure dyeing machines
Release time：
2021-11-09
In order to avoid color spots, stains, spots, and other defects caused by improper process operation and poor operation, the following precautions should be taken when dyeing with high-temperature and high-pressure dyeing machines: 1. When choosing dyes for dyeing, it is best to choose varieties with good diffusion and leveling properties. When matching colors, dyes with similar dyeing properties should be selected. 2. Reduction cleaning is an important step in removing floating colors. After reduction cleaning, the color has slightly faded. At the same time, both rubbing and sun fastness have been improved. 3. The prevention of tar spots is a viscous substance formed in the dye solution, mainly composed of dye dispersants and polyester oligomers. Polyester oligomer is a type of polyester polycondensation that, during high-temperature and long-term dyeing processes, seeps out of the fibers and flows into the dye solution, adhering to the surface of the fibers. The measures to prevent tar spots include: (1) strengthening the pre-treatment of the fabric. (2) Increase the dyeing bath ratio. (3) Apply high-temperature and high-pressure dispersants. (4) Using high-temperature drainage to avoid crystallization and precipitation of dyes after cooling. (5) Shorten the equipment cleaning cycle. 4. When modulating the dye solution, a small amount of cold water should be used to make the dye into a paste, and then room temperature water should be used to dilute it. Attention should be paid that the temperature of the diluted water should not be too high, higher than 60 degrees Celsius, which will cause damage to the dispersed dyeing quilt and agglomeration. In addition to adjusting the dye, powder spreading can also be used for modulation. That is, the dye should be slowly sprinkled into cold water under high-speed stirring, and should not be left for a long time after the dye bath is prepared. Slowly stir with a stirrer to prevent sedimentation.
In order to avoid color spots, stains, spots, and other defects caused by improper process operation and poor operation, the following precautions should be taken when dyeing with high-temperature and high-pressure dyeing machines:
1. When choosing dyes for dyeing, it is best to choose varieties with good diffusion and leveling properties. When matching colors, dyes with similar dyeing properties should be selected.
2. Reduction cleaning is an important step in removing floating colors. After reduction cleaning, the color has slightly faded. At the same time, both rubbing and sun fastness have been improved.
3. The prevention of tar spots is a viscous substance formed in the dye solution, mainly composed of dye dispersants and polyester oligomers. Polyester oligomer is a type of polyester polycondensation that, during high-temperature and long-term dyeing processes, seeps out of the fibers and flows into the dye solution, adhering to the surface of the fibers. The measures to prevent tar spots include: (1) strengthening the pre-treatment of the fabric. (2) Increase the dyeing bath ratio. (3) Apply high-temperature and high-pressure dispersants. (4) Using high-temperature drainage to avoid crystallization and precipitation of dyes after cooling. (5) Shorten the equipment cleaning cycle.
4. When modulating the dye solution, a small amount of cold water should be used to make the dye into a paste, and then room temperature water should be used to dilute it. Attention should be paid that the temperature of the diluted water should not be too high, higher than 60 degrees Celsius, which will cause damage to the dispersed dyeing quilt and agglomeration. In addition to adjusting the dye, powder spreading can also be used for modulation. That is, the dye should be slowly sprinkled into cold water under high-speed stirring, and should not be left for a long time after the dye bath is prepared. Slowly stir with a stirrer to prevent sedimentation.
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