Precautions for HT Jigger Dyeing Machine anodization

1. After anodizing, it can only be washed with cold water, not hot water, or touch with hands to prevent the dyeing of the film from being affected. In addition, in order to prevent residual acid from being carried into the dyeing tank, if necessary, it can be neutralized in a solution containing 10-30mL/L of ammonia or 50g/L of sodium carbonate after anodization.

2. Coloring should be carried out immediately after anodizing and cleaning. If it cannot be dyed immediately, the parts should be soaked in clean water and the parking time should not exceed 1h. If the time is too long, it should be soaked in 10% acetic acid (also phosphoric acid, oxalic acid, tartaric acid or citric acid) at room temperature for 10 minutes before dyeing to improve the dyeability of the film.

3. The anodized parts shall not be attached to or bumped with each other. If the color after dyeing is light, you can continue dyeing in the tank. After dyeing, the parts are cleaned and sealed and dried immediately to prevent the appearance of color and flower.

4. When the dyeing solution is turbid, it should be filtered in time. Because the dirty dyeing solution will cause these solid particles to enter the pores, the brightness of the surface of the dyed parts will be significantly reduced, and the transparency will be poor and unsightly. In order to avoid the staining solution being dirty, distilled water should be used to equip the solution. ‘The dye must be completely dissolved before use. Beware of acid and alkali residues from being brought into the dyeing tank.

5. The temperature of the dyeing solution should not be too high (80～90℃), otherwise the dye molecules will be closed before the dye molecules enter the deep part of the membrane completely, so that the color is too light, the dyeing firmness is too low, or the appearance is flowery.

6. The material for the dyeing tank should be selected reasonably, because some dyes will react with some metals (such as aluminum, copper, and lead). Easy to use enamel, ceramics, polypropylene plastic or stainless steel. When using a stainless steel tank, the hanger should be insulated from the tank body to prevent parts from being corroded by galvanic corrosion.