How far is the era of "waterless printing and dyeing" from us?

"If the printing and dyeing industry can reduce sewage discharge or achieve no water discharge, then both Shaoxing and the national printing and dyeing industry will further promote development and achieve the goal of green environmental protection and sustainable development." At the opening ceremony of the "Advanced Workshop on New Technologies of Water free and Water less Printing and Dyeing in Textile Industry" held in our county a few days ago, Yang Jichao, Vice President of China Textile Industry Federation, directly pointed out the way out and direction of the textile printing and dyeing industry in the future.
The printing and dyeing industry in Shaoxing County accounts for about 30% of the total amount of the country. Facing the problem of printing and dyeing pollution discharge, some enterprises in Shaoxing County can learn from their practices in tackling key technical problems.
Dongsheng Technology: Digital printing realizes waterless printing
Shaoxing Dongsheng Digital Technology Co., Ltd., located in Taoyan Town, has been committed to the research of waterless printing technology since its establishment in 2008, and has successively applied for 12 patents, including 4 invention patents and 7 utility model patents. Among them, GBPM (I) - 180 textile waterless printing machine has passed the provincial new product appraisal.
It is reported that the waterless printing machine produced by the company is directly controlled by a computer. It sprays dyes and auxiliaries onto the fabric, which breaks away from the complicated processes of traditional printing such as plate making, sizing and printing. It not only greatly shortens the production cycle, but also has high printing accuracy, rich colors, and no noise, waste water, waste gas, etc. are generated in the process of printing. Compared with traditional printing and dyeing equipment, it is estimated that 130000 tons of water, 650000 kilowatt hours of electricity and 25000 tons of steam can be saved every year based on the output of 10000 meters and the annual promotion of 100 sets.
Benniu Printing and Dyeing: No cleaning for transfer cotton paper printing
If the innovative technology of "Dongsheng Digital" is only suitable for small batch production, then the Shaoxing County Benniu Waterless Printing and Dyeing Technology Co., Ltd. located in Keqiao Economic Development Zone has found a new method that is more suitable for the production of our county's printing and dyeing enterprises.
In this training activity, Chen Junliang, the general manager of "Benniu Printing and Dyeing", came to learn with the company's R&D team. Chen Junliang revealed that at present, the company has made breakthroughs in the research and development of waterless printing and dyeing new technologies and started to apply them in a small range.
It is reported that the waterless transfer cotton paper printing technology developed by the company combines the advantages of flat screen printing, rotary screen printing, transfer printing and digital printing technology, overcomes the technical problems of thermal sublimation transfer printing of natural fiber fabrics such as cotton with disperse dyes, and selects methods such as dipping, spraying and brushing for cotton, linen, silk and other textiles that have been semi bleached, and uses the new regulator developed by the company to pretreat and dry them, It is consistent with the traditional transfer printing process. The advantage of this technology is that it is suitable for mass production, and it eliminates a lot of subsequent cleaning work in the printing process, saves heat energy for drying, and can realize real water free printing. According to the company's pilot and pilot test data, as long as four or five million yuan is invested in the transformation of a printing production line, the daily sewage reduction is about 35% - 40%.
Printing and dyeing industry: looking forward to new technology of printing and dyeing without water and with less water
"The practical application of advanced dyeing and finishing technology in enterprises will bring about effective improvement of product added value." Yang Jichao pointed out that one of the key tasks of scientific and technological progress in the textile industry during the "Twelfth Five Year Plan" period is to increase the research and development and promotion of efficient short process pretreatment technology of printing and dyeing, water free and water free printing and dyeing technology and functional finishing technology, and focus on the development of water free and water free printing and dyeing processing high-tech, so as to provide technical support for the industry to achieve cleaner production and improve sustainable development capacity. "Among them, new transfer printing technology is an important way to achieve less water and water free printing and dyeing technology." Yang Jichao said.
According to the analysis of insiders, compared with traditional printing, the current transfer printing generates much less sewage, but the transfer printing has problems such as poor color and pattern quality, and can only be used on polyester fabrics. How to apply transfer printing technology to natural fabrics such as cotton and wool? If relevant enterprises solve this problem, it will be a real "technological revolution" and play an important role in the development of printing and dyeing industry towards green and environmental protection.
(Shaoxing County News)