Key points of chemical material operation of high temperature and high pressure overflow jet dyeing machine

Check the accuracy of the dyestuffs prepared according to the prescription list. When disperse dyestuffs are made, generally use cold water to make a slurry and stir evenly (stirring with a mixer for about 20-30min), and then use 40～45℃ warm water to dilute it evenly. Dispersant and ammonium sulfate should be boiled and stirred evenly with warm water. In case of difficult disperse dyes, you can use alcohol or a powder solution to make a slurry, beat with cold water and stir well, and dilute with warm water. When adding dyestuffs, be sure to filter with a sieve, and the small particles remaining in the sieve should be re-degraded with water and then filtered. The feeding sequence is to add acetic acid at about 40°C, run for a while, adjust the PH value to 5-6, add dye, run for 10 minutes, dye according to the predetermined temperature rise curve. If there is too much foam in the machine after feeding, in order to avoid damaging the circulating pump, reducing the head or even floating the fabric, a defoamer should be added in time.