Hthp dyeing machine refers to the dyeing above 120℃, in order to obtain high temperature must make the dyeing in a closed system, the pressure is also increased, so it is also called "high temperature and high pressure dyeing". The function of high temperature and high pressure dyeing machine is to make polyester fiber expand under high temperature, and at the same time, the solubility of disperse dyes increases, the number of free molecules increases, and the kinetic energy increases, which is conducive to the acceleration of dyeing.

Factors affecting the dyeing process of high-temperature and high-pressure dyeing machine:

1.Temperature: temperature increase is conducive to dyeing, too high will cause the decomposition of dyes, and damage the fiber, generally with 120-130℃ dyeing is appropriate, can not exceed 145℃. Moderate high temperature dyeing can make the dyeing brightness is good, the leveling property is good, the floating color caused by dyeing is also less.

2.PH value: PH 5-6 is appropriate;

3, the bath ratio: the bath ratio cannot be too small, too small will make the dye solution to the fabric contact bad and cause dyeing flowers, or the use of fabric operation can not free and scratch or creases, chicken feet.

4, auxiliary agent: the role of the auxiliary agent is to make the dye uniform adsorption, help the dye in the fiber surface and fiber internal homogenization transfer, prevent the dye again to avoid oligomers, adhesion to the fabric to form tar spots.

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