The large amount of waste water discharged by the printing and dyeing industry each year causes serious environmental pollution. Statistics show that the annual wastewater discharge capacity of the printing and dyeing industry is as high as 2.4 billion tons. At present, although the supercritical carbon dioxide fluid warp beam dyeing technology commonly used in the printing and dyeing industry can perform anhydrous dyeing on textiles, the leveling properties of the processed products are not easy to control, the quality rate is low, the dyeing time is long, and the equipment is manufactured. The demand is high, and the application of industrialization is more limited.
There is now a key technology for textile anhydrous supercritical carbon rope dyeing. They adopted the idea of ​​a new composite cord-like pattern for the dyeing of fabrics. For the first time at home and abroad, the controllable cyclic movement of fabrics in supercritical carbon dioxide high-pressure systems was successfully achieved.
This technology is to process the dyed fabric into a new kind of composite rope on the supercritical carbon dioxide fluid equipment system , and then use the lifting mechanism of the equipment and the circulating action of the dyeing fluid to jointly drive the fabric operation, which greatly increases the fluid and its The uniform exposure of the dissolved dyes to the fabric achieves even dyeing of piece dyed fabrics while also shortening the dyeing process time. The use of supercritical carbon dioxide fluid as the dyeing medium for the dyeing of textiles with anhydrous dyeing can truly achieve zero emission and zero pollution, and realize the green, ecological and environmentally friendly production of textiles.
Compared with the traditional water bath dyeing, the key technology of supercritical carbon dioxide anhydrous rope dyeing does not require drying and other conventional dyeing after dyeing. It can save energy about 20%, and dyeing production efficiency can be increased by 3-6 times. Compared with the existing piece-dyeing technology, the new technology developed by the team achieves the dual circulation of the rope-like fabric and the dyeing fluid at the same time, effectively solves the problem of non-uniform dyeing, improves the quality of the product, and also simplifies the production process. The high-pressure equipment system is difficult to design and manufacture, and its practicality is stronger.
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