1) Heating requirements:
Control the temperature rise, otherwise the temperature rises too fast, it will cause the dye to be dyed too fast, and the phenomenon of color difference will appear.
① Colored flowers: refers to uneven dyeing.
② Mid-way heat preservation (90℃*5') Purpose: to heat up the dye after being evenly absorbed by the fiber to prevent stains.
③ Heating speed: should be slow, generally controlled at 1~2℃/min
2) Cooling requirements:
① Requirement: After dyeing, the temperature will drop below 80℃ (generally controlled at 1~2℃/min)
② If the temperature drops suddenly after dyeing, chicken foot prints (wrinkles) are likely to appear or the fabric feels rough.
③ General operation:
After cooling down to 80°C at 2°C/min, perform post-washing treatment. It is strictly forbidden to open the lid and wash with water above 80°C, otherwise safety problems may easily occur.