Remedial treatment after sudden failure of high temperature and high pressure dyeing machine

(1) Stage before reaching 100°C

At this stage, the pressure has not been boosted. If a fault occurs, the consequences are usually not serious, and the processing is relatively convenient and simple. After the fault is eliminated, the original process can still be used to start dyeing again from 60 °C. Since under 100 ℃, the bulking of polyester fiber is not sufficient, and the disperse dyes have not been dyed in large quantities, so the problem of color pattern and wrinkle printing will not be obvious. However, just in case, when the heat preservation stage reaches 130 °C, the time of heat preservation and dyeing can be appropriately extended to make insurance compensation. Thus, dyeing results are generally more satisfactory.

(2) 100°C to 130°C stage

When a failure occurs at the stage of 100-130°C, due to the pressure in the dyeing machine, safety should be paid first when dealing with the problem. At this stage, due to the accelerated bulking speed of polyester fibers, the dyeing speed of dyes has also increased significantly, and color stains will be extremely difficult to avoid. If it is not a major accident and the treatment time is not too long, high temperature leveling agent can be added and the heat preservation dyeing time can be extended; if the accident treatment time is long and the fabric stays in the dyeing machine for too long, the high temperature carrier method must be used for strengthening Treatment; when the problem is serious, the high temperature carrier method can be repeated again.

(3) 130℃ insulation dyeing stage

When a fault occurs in the dyeing stage of heat preservation at 130°C, when the accidental heavy dyeing is handled after depressurization and cooling, the previous heat preservation time should be discarded, and the heat preservation time should be extended according to the process regulations to make insurance remedial. At this stage, the adsorption of disperse dyes is relatively sufficient, and it is not necessary to further make them play the role of migration and penetration to fully penetrate into the fiber. Therefore, although the risk of defect occurrence is greater than that before 100 °C, it is less than 100-130 °C. ℃ boost stage. However, if the fabric is blocked and shut down, or stays in the dyeing machine for a long time, high temperature leveling agent 0.5-1g/L should be added during heavy dyeing, and then the holding time should be extended appropriately. This can not only promote and strengthen the dye migration, but also help to overcome the wrinkle and brake printing.