At present, there are mainly two methods for dyeing polyesters with disperse dyes, namely, high-temperature and high-pressure dyeing and hot-melt dyeing. The high-temperature and high-pressure dyeing method is batch-type production, and is more suitable for small-volume production. It is also applied in some printing and dyeing plants; the more commonly used is padding with hot-melt dyeing machines. This method is more efficient and more efficient. Conducive to quality control.
The continuous pad dyeing procedure for disperse dyes is as follows:
Dip pad dyeing solution → infrared pre-baking → hot air pre-baking → drying tube drying → baking → padding reduction solution → steaming → washing → soaping → washing → drying
For polyester-cotton blended fabrics, the two fiber components in the fabric should be taken into consideration when dyeing. This requires selecting the appropriate process according to the depth of the color and the customer's requirements. There is a single dyeing method and a double dyeing method.
Single dye
For very light colors or when the customer only requires a single dye effect (another fiber blank), a single dyeing of the fiber component may be used.
2. Double dyeing
In more cases, two kinds of dyes should be used to dye polyester-cotton blended fabrics. The following processes are available for selection: dispersion-activity one-bath dyeing; dispersion-reduction one-bath dyeing; dispersion - Active two-bath dyeing; Dispersion-reduction two-bath dyeing.
The one-bath dyeing process of polyester-cotton blended fabrics is suitable for dyeing with light colors; the two-bath process has a longer process and energy consumption, but it also ensures the dyeing quality of dark-colored polyester-cotton blended fabrics. favorable. Printing and dyeing plants should select the appropriate process according to the actual situation.
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