The first is temperature. Temperature is critical for high-temperature dyeing machines. Increasing the temperature can effectively increase the dye uptake rate of the entire disperse dyes. However, if the temperature is higher than 130 degrees, many disperse dyes The change in dye uptake rate is no longer obvious, so if the temperature is too high, the polyester ester bond will be hydrolyzed, which will cause a significant decrease in the strength and elasticity of the fiber, and the color light will be relatively poor, so it is normal. The high temperature dyeing temperature should not exceed 145 degrees, and the normal temperature should be kept between 125-130. If dyeing is carried out in this temperature range, not only the color yield will be higher, but the entire dyeing will be level. The effect is also good. In order to allow the fuel to be evenly absorbed by the polyester, we should strictly control the rate of heating. When the temperature reaches the specified temperature, we should carry out a period of heat preservation dyeing to ensure that the dye can be fully penetrated or Diffusion, the normal heat preservation and dyeing time is between 30-60 minutes. If you want a light color effect, the time can be slightly shorter. If the dyeing is darker, the time will be relatively longer. At the end of the entire dyeing After that, do not cool down too quickly, otherwise there will be creases or affect the feel and other effects.
The second is the application of additives. At the same time, in high-pressure and high-temperature dyeing, in order to ensure that the dye can be stably dispersed in the dyeing bath, and if we want to obtain a better leveling effect, we can add a leveling agent or disperse appropriately in the dyeing bath. Agents and other additives.
Finally, it's the PH value. Many disperse dyes will not actually undergo any hydrolysis under high temperature and alkaline conditions. Therefore, in the control of high pressure and high temperature dye baths, the acidic conditions should be guaranteed to have good results.
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