The pH, temperature, and other parameters of the dyeing bath are determined by the nature of the fiber and the dye. Cellulose fibers are dyed in alkaline or neutral dye baths. Dyestuffs with small dye structures can be dyed at about 30°C; larger molecules need to be dyed at about 90°C. Adding salt or sodium sulphate to the dye bath can increase the percentage of dyeing. Protein fibers are not resistant to alkali, and staining is generally performed in acidic or near-neutral dye baths. Wool has a scaly layer structure, which hinders dye molecules from entering the interior of the fiber. Generally, they are dyed near the boiling temperature. Polyester structure is tight, and it seldom swells in water. It hinders the entry of dye molecules into the interior. It can be dyed in a dye bath of about 130°C. If a carrier agent is added to the dye bath, it can be near atmospheric pressure at atmospheric pressure. Dyeing. Polyester textiles can also be used to paddle disperse dyes. After drying, the dyes are heated to about 200°C and quickly enter the fibers. This method is called hot-melt dyeing. Want to learn more about buttons: accessible Yangzhou YILIYUAN Rope & Net Factory , https://www.yzknsmy.com