Supercritical CO2 dyeing equipment is a cutting-edge waterless dyeing device, which is environment-friendly and mainly used on fabric’s dyeing and finishing. This device consists of liquid-filling & pressurizing under supercritical state, dyeing, separation, CO2 fluid circulation under high temperature & pressure, etc.
Characterized by higher diffusion coefficient and lower viscosity, supercritical fluid boasts good transitivity and extremely low surface tension, making it easy to infiltrate into the inner structure of fibers, which determines its advantage of using as a medium in the dyeing process. Categorized as non-polar molecule, CO2 is suitable for dyeing of hydrophobic synthetic fibers, among which polyester fiber is an important type, characterized by stronger hydrophobicity, less dyeing groups, poorer moisture absorption ability and smaller expansion in water. It is only easy to get dyed by dyestuff with small molecular weight and hard to get dyed with hydrophilic dyestuff. Furthermore, it’s hard to get polyester fiber dyed deep enough to realize a durable luster. Supercritical CO2 dyeing makes dyestuff infiltrate into polyester fiber in a better way, intensify its swelling, accelerate dyestuff molecule’s diffusion and transmission, hence speed up the bonding of dyestuff molecule and polyester fiber.
1. It realizes waterless dyeing and completely avoids waste water production in dyeing process to protect water resources.
2. It reduces energy consumption significantly, especially drying processes after dyeing are no longer needed.
3. No auxiliary agents are used during dyeing.
4. CO2 is non-toxic and easy to get. No toxic gas emission during dyeing processes. CO2 is recyclable and causes no greenhouse effect.
5. Supercritical CO2 dyeing boasts efficient dyeing rate and high level dyeing property. Dyestuff’s absorption rate is up to 98%.
6. Residual dyestuff (only 2%) could be recovered in power state to improve dyestuff’s utilization ratio.
7. Short dyeing time. No reduction cleaning is needed after dyeing.
1. Over 10 years’ experience in manufacturing small and middle-sized dyeing machine.
2. We’ve been in frequent and close communication with experts of dyeing faculties at colleges and universities in China.
3. Professional after-sale service and new product R&D teams.
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