New Progress Made By China'S Printing And Dyeing Industry In Environmental Protection And Energy Saving

Recently, China

The Association issued a notice, officially launched the Sixth Batch of "China's printing and dyeing industry energy-saving and emission reduction advanced technology recommended list" declaration.

It is understood that since 2007, China printing and dyeing industry association has issued 5 batch of printing and dyeing industry's energy-saving and emission reduction advanced technology recommended catalogue.

Including the disc type waste heat recovery system, water environmental protection, non-toxic lightweight heat insulation coatings, zirconia oxygen analyzer combustion control energy saving technology, 144 energy-saving and emission reduction advanced and practical technologies have been recommended, which has attracted the attention of the competent departments at all levels, and has been adopted by more and more enterprises, and achieved obvious economic and social benefits.

According to relevant information, during the "11th Five-Year" period, China's printing and dyeing industry has made great achievements in energy saving and environmental protection, and has fulfilled the requirements of the national energy conservation and emission reduction binding targets.

A number of advanced technologies for energy saving and consumption reduction have been widely applied to the pretreatment and finishing processes of printing and dyeing, such as high efficiency short flow pre-treatment technology, biological enzyme desizing, cold pad batch dyeing and so on, which can effectively achieve the goal of saving water. The advanced treatment and reuse technology of production water developed by the printing and dyeing industry has increased the reuse rate of production water and greatly reduced the discharge of sewage.

After entering the "12th Five-Year", the task of energy conservation, emission reduction and adjustment and upgrading of the textile industry is still arduous.

Relying on scientific and technological progress and management innovation, improving the level of energy conservation and emission reduction and promoting sustainable development of the industry has become the consensus of the whole industry.

Where should we keep our strength?

The printing and dyeing industry has always been

Large water users are also the "first export" of sewage.

During the "12th Five-Year" period, it is imperative to develop and implement low input and efficient water pollution control measures, develop new technologies for water and anhydrous printing and dyeing, and achieve cleaner production.

Is it feasible to achieve zero pollution and zero discharge printing and dyeing technology and minimize pollution to the printing and dyeing industry?

In order to achieve zero pollution, cotton spinning and dyeing industry must work in two links, that is, yarn free and fabric free.

Yarn sizing and water washing and desizing require a lot of water resources, and the slurry contains strong alkali and other chemicals that pollute the environment.

The slurry free production process solves this problem.

What is the effect of yarn not sizing on the spinning process? Is it feasible to make the sizing process feasible? Reporters learned that the Wuxi Nuo Sai Jing Technology Co., Ltd., a subsidiary of Wuxi natural textile group, set up a group of non slurry weaving technology projects in 2003.

Study the yarn free process.

In the conventional woven fabric production process, the yarn is warping and sizing, and then enters the weaving process.

And no slurry weaving technology is good warp yarn directly into the weaving process, eliminating the sizing process.

The technology applied for invention patent in 2008 and began trial production.

In April 2010, the China Textile Industry Association (the predecessor of China Textile Industry Federation) held a project appraisal meeting to give full recognition to the project.

The expert group believes that the whole process of pulp free weaving and production of high-grade woven fabrics has been integrated and innovated, and the technical achievement has reached the international advanced level.

In May 2010, the project was awarded.

Industrial association two prize in science and technology.

At present, the technology has been industrialized.

The production of high-grade woven fabrics can meet the fabric needs of home textiles and high-end shirts.

"The cost of the free fabric is slightly higher than that of the conventional woven fabric, but it saves a lot of water and slurry costs, and is still cost-effective.

We now want to find cooperative enterprises to jointly develop a series of products, expand the scale of the production of non woven fabrics, and finally form an industrial alliance without slurry yarns and fabrics.

Wei Shun, general manager of Nuo Sai Jing technology company, told reporters.

Returning to nature is feasible

Through the technology of digital direct jet printing and sublimation pfer printing, the technology of printing and dyeing with no water and little water has formed a certain scale today.

However, these technologies are not suitable for the production of large quantities of fabrics, and the pollution of the environment still exists more or less.

The solution to this problem is to replace natural dyes with chemical dyes to achieve zero pollution in the real sense.

Natural dyes, also known as natural pigments, are mainly derived from roots, stems, leaves, flowers and fruits of plants, and animal or natural colored ores, mainly of plant dyes.

Natural plants and mineral dyes in China have a long history and can be traced back to the Qin and Han Dynasties.

The dyes at that time included dozens of chromatographic series, which were rich in color and brilliant, with blue, red, yellow, purple, and so on.

Later, after a long history of development, natural dyes in China gradually dropped out of the field of vision and swamped in the vicissitudes of history.

In recent years, with the pursuit of naturalization, advocation of nature and environmental protection and individuation, the requirements for textiles are becoming more and more naturalized. Natural dyes cater to the needs of people and are gradually returning to the market.

In the field of high-end textiles and advanced garment customization, handicrafts and garments processed by natural dyes have been sought after by hand, and their value has doubled.

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Chinese traditional printing and dyeing technology has four valiant theories, they are clip vale (Blue Clip vale), wax valerian, twisted valerian and gray valerian.

They are sandwiched, batik, tie dyed and blue printed cloth today.

These dyeing and weaving methods, known as the last remnants of Chinese history, still occupy a place in China's printing and dyeing industry.

According to the book "China blue jacket vale" written by Zhang Qin, a scholar of Chinese blue jacket technology, there are still blue quilt and vale quilt popular in Taizhou, Lishui and other places in Wenzhou.

After years of research and investigation, she recorded the posterity and production process of Blue Clip vale.

"There is a place called Lonicera factory in Beijing, which is the place for weaving and dyeing fabrics.

There are flowers and valiant robes and silk fabrics in the Imperial Palace, but later, because of the change of materials, dyed cotton cloth needs more dyes. For the sake of cost, the last thing is the blue jacket.

Zhang Qin said.

Rescuing and excavating our traditional natural printing and dyeing processes and reproducing their natural green dyeing effect is a problem we need to take seriously.

However, the drawbacks of natural dyes are not resolved, and they are popularized into empty words.

Because of poor color reproducibility and low pigment content, plant dyes should be solved in order to solve the problem of large scale and industrial production.

Experts believe that plant dyes and other solids can be used to mimic the structure, distribution and function of plant pigments, and be modified according to the characteristics of pigments and plant needs to make them more suitable for dyeing needs.

It is understood that the equivalent dyes in China are carotene, tannin, indigo, acid indigo, purpurin, alizarin and pseudo purpurin.

Researchers at Soochow University use silkworm by-products such as mulberry twig, silkworm excrement and mulberry fruit in the traditional silkworm breeding industry to remove waste from advanced sericulture and turn them into natural and environment-friendly textile dyestuffs.

In addition, the low dye uptake and poor fastness of natural dyes have been a major problem for research and application personnel.

Using metal ions for mordant dyeing, a bridging dyeing between dyes and fibers can be carried out, thus improving the dye uptake and improving the color fastness.

But in recent years, some heavy metal ions which are harmful to human body are limited.

Foreign researchers began to try to use some ecological metal ions, such as zinc, aluminum, titanium and other mordant dyes. Experiments proved that they achieved good results in dyeing experiments on natural fibers such as cotton, silk and wool.

Cao Hongmei, a lecturer at Changzhou Textile Garment Institute, believes that natural dyes have won people's favor due to their natural hue, elegant style, antibacterial, anti ultraviolet, good environmental compatibility and natural fragrance.

At present, natural dyes completely replace synthetic dyes are unrealistic, but new technologies are injected into natural dye obtaining and dyeing processes, modern equipment is adopted, attention is paid to the establishment of standards, the cultivation and development of brands are emphasized, and the process of industrialization is accelerated.

With the unique resources and market in China, it is entirely possible to have a natural dye dyed product in the high-end textile market by vigorously developing and popularizing it.

The textile "12th Five-Year" science and technology development outline has listed 17 new technologies for energy saving and emission reduction, such as cotton fabric biological enzyme refining, low temperature bleaching and other efficient short flow pre-treatment technologies, such as foam, paint, coating, cold pad batch and microcapsule dyeing and other low liquid rate dyeing and finishing technology, paint dyeing, reactive dyestuff wet short steaming dyeing, knitted flat cold pad batch dyeing, new pfer printing, less water, no water printing and dyeing technology, and printing and dyeing online detection and digitalization technology, indicating the development direction of textile dyeing and printing industry.

There is reason to believe that with the popularization and application of Textile Scientific and technological achievements, the goal of zero pollution in the whole process of printing and dyeing will surely be realized on the day when textile powers come.