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High Temperature High Pressure Overflow Dyeing Machine features low bath ratio
May 16, 2018

When the high-temperature and high-pressure overflow dyeing machine performs the dyeing, the dyeing process is also performed at a very low bath ratio (below 1 : 4). However, such low bath ratio dyeing conditions will bring about changes in dye uptake on fabrics. After the experiment showed that the directness of the reactive dyes in the high temperature and high pressure overflow dyeing machine will increase as the dyeing bath ratio decreases.

 

When the high-temperature and high-pressure overflow dyeing machine is in use, in terms of this dyeing process, in addition to increasing the dye uptake rate, it is also necessary to ensure a higher fixing rate, so that for achieving a certain color depth and The basic requirements for color fastness.

 

In the case where it is not possible to dye 100% of all dyes onto fabrics, there will always be some hydrolyzed or accumulated dyes attached to the surface of the fabric fibers. If they are not removed, in this case, they will be used in the process or washed. It peeled off. It is precisely because of this that in order to improve the fastness of dyeing, it is an important control index of the dyeing process.

 

When used in high-temperature and high-pressure overflow dyeing machines, the dyeing fastness of fabrics depends on the dye characteristics, which depends on the degree of dye penetration during the dyeing process, and on the unstained or hydrolyzed dyes. It cannot be fully washed. For this dyeing low bath ratio condition, it is also possible to achieve a higher fixing rate without the use of excessive accelerators and fixing agents, but the reduction in fixing agent (e.g., alkali) can be reduced. Hydrolysis of dyes. The improvement of the directness of dyes can also reduce the dependence on the accelerant (such as Yuanmingfen, salt and other electrolytes), and increase the dye uptake rate.

 

After that, with regard to the use of high-temperature and high-pressure overflow dyeing machines, it is actually necessary to pay attention to the fact that when the reactive dye is used in the dyeing of the equipment, in order to control the dye uptake rate, a high-temperature and high-pressure overflow dyeing machine is performing When dyeing, in general, it is necessary to pay attention to the use of reactive dyes with relatively low directness.

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