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How to use vat dye exhaustion
Apr 24, 2018

Reducing Dye Exhaustion Dyeing In spite of being divided into a variety of ways, only the basic conditions for each dye are not limited to one condition. So this provides a wide range of color matching, of course, dyes of the same dyeing method is the preferred approach. The following is an example of the practice of dyeing with A, B, and C dyes:

(1) Recovered orange (9), reconstituted blue (4), and reconstituted green (1) of the alpha method group. Their coloring was correlated at 45 minutes with the amount of caustic soda and sodium chloride and their temperature, and the alkali content of the reconstituted orange (9) dye bath was higher. This is the characteristic of the A-method staining. If you participate in a few sodium chloride and choose a lower temperature, the effect on the coloring rate is not obvious. Therefore, it can also apply B dyeing. This means that this dye can be used as an auxiliary color to fight with the B group dye.

The recovery blue (4) is the same to use a higher alkali concentration. The effect of temperature on the dyeing rate is not very obvious. Figure 5-1 The dyeing conditions and coloring rate of the dyestuffs of the alphamethine group are obvious, but the dyestuff utilization rate is the highest at 40-60°C. Reconstituted blue (4) stain cannot participate in sodium chloride, otherwise the dye is separated. Therefore, it cannot match the dyes of the B and C groups.

Recovery Green (1) had no significant effect on alkali concentration and temperature.

(2) The stains of the restored orange (11), reconstituted orange (18), and reconstituted black (27) of the B-fabric group are best for the recovery of orange (11) in terms of temperature, alkalinity, and participation in the sodium chloride staining rate. Slightly alkaline dyeing, the most appropriate temperature at 40 ~ 60 °C, participate in the amount of sodium chloride to 20g / l as well. Recovered orange (18) had little effect on the amount of alkali in the dyebath, and the amount of salt had a satisfactory effect at 10g/l. Although classified in Group B, a suitable dyeing temperature is 60°C. Reconstituted black is not closely related to the concentration of alkali and salt in the dyebath. The most appropriate dyeing temperature is 40°C, and thus it can also be stained with the A method.

(3) The relationship between the recovery rate of yellow (26), reconstituted orange (1) and reconstituted red (46) in the propionamide group, and the alkali concentration, salinity, and temperature are shown in Figure 5-3.

From Fig. 5-3, it can be seen that reconstituted yellow (26) has the best staining effect in light alkali. If the lye is too concentrated and the temperature rises to 60°C, the dye is destroyed, so it cannot be color-matched with the KFA dye. The reconstituted orange (1) has no significant effect on alkali, salt concentration, and temperature in the dyebath. Therefore, it does not need to participate in the salt of the C method, and it can also be stained with the B method. Reconstituted red (46) is best coloured in a low alkali bath. The suitable temperature is 20°C. When the salt content is increased to 40 g/l, the dyeing rate can be significantly improved. If it is mixed with B-group dyes, it will waste the utilization of dyes.

Grasp the dyeing performance of commonly used dyes, you can just spell the color. For example, the recovery green (1) of the alpha method group, the orange (18) method of the b method group, and the orange (1) method of the propanol group have little influence on the change of the alkali concentration and temperature. So they can fight with a variety of dyes.

In practical production, there are also a few exceptions. For example, although reconstituted orange (1) is in the C group, no salt is added. The reconstituted blue (30) and reconstituted red (29) are in the alpha method group, but they are salted when dyed. The dyeing conditions and dyeing rate of the C-property dyestuffs require strict control of the temperature, but the recovery of Violet (9) is an exception and therefore should not be combined with the B- and C-method dyes.

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