To implement the “double carbon” journey with innovation, what explorations are being made in the printing and dyeing industry?

To implement the “double carbon” journey with innovation, what explorations are being made in the printing and dyeing industry?

In recent years, under the background of “double carbon”, my country’s printing and dyeing industry‘s carbon emissions have been declining year by year, but it has not yet completely gotten rid of high energy consumption, high current status of emissions. Faced with the dual carbon goals, the printing and dyeing industry is accelerating the integration of full life cycle green technology management into the entire industrial chain system through green layout.

“Improving energy efficiency and reducing energy consumption in the printing and dyeing industry can be achieved through structural adjustment, product substitution, process transformation, behavior change and other paths.” Weifang Saibao Industry, the Fifth Research Institute of Electronics of the Ministry of Industry and Information Technology Ci Yuhui, deputy director of the Science and Technology Development Department of the Institute of Technology, pointed out. Along this path, many Chinese printing and dyeing-related enterprises are responding to the national “double carbon” goal with continuous exploration and showing fruitful results.

From waterless dyeing to digital printing, many key technological breakthroughs point to “double carbon”

In June this year, the Ministry of Industry and Information Technology issued the “Notice of the Ministry of Industry and Information Technology and six other departments on the issuance of an action plan to improve industrial energy efficiency.” The “Action Plan” clearly proposed the key directions for the energy-saving and efficiency-improving transformation and upgrading of the textile industry, including Promote low-energy-consuming printing and dyeing equipment, and apply advanced technologies such as low-temperature printing and dyeing, small liquor ratio dyeing, and continuous printing and dyeing of knitted fabrics.

The printing and dyeing industry has complex processes, many parameters, and many production and management control factors. The key technologies in each link can effectively promote the low-carbon development of the industry.

A few days ago, Mao Zhiping, director of the National Advanced Printing and Dyeing Technology Innovation Center, gave examples in a lecture of several advanced printing and dyeing technologies that meet the requirements of low-carbon production: among them, biological enzyme desizing and refining is more energy-saving than traditional high-temperature and strong alkali desizing and refining. , reducing the use of chemicals, etc.; catalytic and activated low-temperature bleaching technology can significantly reduce the processing temperature and shorten the processing time; supercritical CO₂ fluid dyeing technology (waterless dyeing) is being widely studied in China, and its characteristics are Energy saving and emission reduction can also effectively improve the efficiency and quality of dyeing; compared with traditional powdered disperse dyes, liquid disperse dyes reduce the proportion of dispersant and can significantly reduce organic wastewater emissions. The application of disperse dye wash-free dyeing technology and disperse dye dyeing foot water recycling technology can achieve good energy-saving and carbon reduction effects; reactive dye low-carbon dyeing technology has the ability to reduce It has the advantages of sewage discharge and improved color fixation rate; digital inkjet printing technology is now relatively mature, and the printing process does not require color paste, saving water and reducing emissions. Behind every step taken by these innovative technologies lies the failure experience and unremitting efforts of countless scientific researchers.

Take the currently focused “waterless dyeing” technology as an example. This technology means that there is no need to pre-process and post-dye the yarn. The entire printing and dyeing process is water-free, and there is no need to add other chemical materials such as dyeing salts. , it can achieve or even exceed the effect of traditional water medium dyeing, and the organic solvent recycling rate exceeds 99%.

In June 2021, Qingdao Jifa Group’s supercritical CO₂ fluid dyeing demonstration production line began trial operation. The annual production capacity can reach 1,000 tons, reducing the dyeing efficiency from 8-12 hours of traditional water dyeing to 3-4 hours. .

At the recently held 3rd International Dyes and Auxiliaries Online Exhibition, the waterless dyeing technology for cotton fabrics promoted by Guangdong Zhichuang Waterless Dyeing Workshop Technology Co., Ltd. also attracted many visitors, and there was an endless stream of inquiries and dockings. .

In May this year, the “polar/non-polar binary non-aqueous medium dyeing technology (waterless dyeing technology) research and industrialization demonstration” undertaken by Guangdong Esquel Textile Co., Ltd. also successfully passed the acceptance of the National Ministry of Science and Technology. The person in charge of the project said that the team has successively overcome many key difficulties such as color fastness, dyeing uniformity, and solvent recovery, and finally established the first cotton yarn production line with an annual output of 3,000 tons. /font>Waterless dyeing production demonstration line. It is reported that this project has complete independent intellectual property rights and has applied for 27 national invention patents.

At the same time, digital inkjet printing technology and equipment have become increasingly mature. Although rotary screen printing and flat screen printing equipment still dominate at present, with the advancement of green printing and dyeing transformation, digital inkjet printing continues to evolve, and there is huge room for development.

In the past, digital printing compared to traditional printing, the most obvious disadvantage was the slow printing speed. Today’s digital printing technology has developed from scanners to SinglePa technology, and the speed has increased. Significant improvement. Honghua Digital’s VEGA8000DI high-speed, high-precision intelligent digital inkjetprinting machine has a printing speed of up to 630m/h.

In addition, digital printing also includes color fastness, precision, stability, reliability and environmental protection as development goals. Epson launched MonnaLisa Evo Tre16 industrial-grade direct printing The original Genesta ink used in the digital printing machine is mainly safe and environmentally friendly.

Mo Linxiang, executive deputy general manager of Zhejiang Red, Green and Blue Textile Printing and Dyeing Co., Ltd., said: “The green development of the printing and dyeing industry is the general trend, and companies must increase investment and actively respond. Red, Green and Blue is very optimistic about digital printing.”��Especially under the epidemic, the advantages of digital printing in small batches and quick turnaround have become more prominent, bringing new market growth points to the printing industry. ”

Want green management, and energy conservation and emission reduction throughout the production process

Under the “double carbon” goal, in addition to technological innovation, printing and dyeing enterprises have sought greening through management innovation. , energy-saving development. “The printing and dyeing industry has both tradition and future.” Liu Chengyuan, chairman of Shenzhen 3A Enterprise Management Consulting Co., Ltd., pointed out that at present, there is a large competitiveness gap among printing and dyeing enterprises, and leanintelligent font>Construction will be the key to winning the market and an important means to achieve low-carbon development.