The importance of temperature control in high temperature dyeing machines

When dyeing with a high-temperature dyeing machine, the heating rate must be correctly controlled. The actual heating rate should be reasonably set according to the level dyeing property of the dye used, the depth of dyeing, the circulation state of the dyeing liquor and different dyeing stages. The usual heating rate is 1-2°C/min. It can be fast when it is fast. Slow when it shouldn't be fast.

When the dyeing temperature is below 85°C, the dye is rarely dyed and the temperature can be raised directly. 85°C-110°C is the temperature area where the dyeing speed increases rapidly, and the temperature rise rate needs to be strictly controlled below 1.5/min. It can be slightly faster in the range of 115°C-130°C, but the heating rate needs to be controlled at about 2°C/min. The holding time here is for medium-depth colors, light colors can be appropriately shortened, and dark colors can be appropriately extended. The holding time should be suitable, if it is too short, it will cause ring dyeing, and if it is too long, it will easily produce wool. Generally should be controlled in 30-60min.

Cool down quickly after dyeing, because oligomers will be produced during the slow cooling process, and the surface of the residual thread is tar-like and difficult to remove.