Environmental dyeing and finishing technology inventory: environmental dyeing technology

Reactive dye salt-free dyeing technology

In the dyeing process of reactive dyes, the large amount of salt, low dye utilization, high energy consumption and water consumption, and low success rate have always been major bottlenecks for the sustainable development of the printing and dyeing industry . The salt-free dyeing technology of reactive dyes led by Qingdao University has broken through the traditional dyeing theory and the bottleneck of dye-free dyeing technology. It has developed a complete set of techniques and equipment for the dye-free dyeing of fabrics and cotton and hemp fiber, and developed a special activity for salt-free dyeing of the whole chromatographic series. Dye and fixing alkali agent.

Schematic diagram of continuous dyeing process of reactive dyes without salt

On the basis of the innovation of complete sets of technology and equipment, this technology has realized the industrial application of salt-free dyeing for the first time, completely eliminating the use of salt and greatly improving product quality and added value. The dyeing success rate of fabric dyeing reaches 98.5%. Compared with the two-phase dyeing, the success rate is increased by 5.5%, the energy saving is 27%, and the pollutant emission is reduced by 74.2%. Compared with the conventional bulk fiber dyeing, the production cost is reduced by 32%. 67% of the product, wastewater discharge reduced by 46%.

Knitted fabric flat dyeing and finishing technology

Due to the particularity of the structure of knitted fabrics, the dyeing and finishing of knitted fabrics at present is mostly rope-like batch processing. Pre-treatment, dyeing and washing in the dyeing tank require a large amount of water, electricity and steam, and many additives and dyes will be used. As the sewage is drained, the sewage treatment burden is increased. The continuous continuous dyeing and finishing process can effectively solve the problem of rope-like intermittent dyeing and finishing. Compared with rope intermittent dyeing and finishing, the flat-width continuous dyeing and finishing process can achieve water saving of 60%, energy saving of 50%, and reduction. The dyeing agent is 15% to 25%, the fabric is more uniform in dyeing and the surface is smoother.

Benninger Knitted Fabric Processing Line

The production lines of the flat bleaching, dyeing and washing of knitted fabrics of the companies of Hengtian Lixin, Berninger (Benninger) and Opeltek of Germany can improve the efficiency and reduce the processing cost, which promotes the knitted fabric. Technological advances in flat continuous processing.

Foam dyeing technology

Due to the small bath ratio, the foam dyeing and finishing technology can greatly save water, and significantly reduce the amount of various additives and shorten the processing time. In addition, the conventional dyed fabric has a liquid-carrying rate of generally 60% to 80%, and the foam-dyed fabric has a liquid-carrying rate of generally 10% to 40%, thereby reducing waste water discharge and reducing environmental impact.

AUTOFOAM foaming machine

Foam dyeing and finishing technology has the advantages of low liquid supply, high efficiency and low emission. However, the theoretical research on the rheology and thixotropy of foam is still immature, which brings difficulties to the technical guidance of industrial production. Therefore, it is necessary to strengthen the basic theoretical research related to foam dyeing and finishing, and at the same time develop various environmentally friendly and suitable auxiliaries for foam dyeing and finishing, improve the technical level of foam dyeing and finishing equipment, and realize the application of foam technology in all aspects of dyeing and finishing.