One Side Dyeing Process For Low Carbon Ecosystem

Implementation of ecological safety, energy conservation and environmental protection production.

Textile dyeing and finishing is a typical chemical treatment.

Shanxi Cai Jia printing and dyeing Co., Ltd. has successfully tested sulphur dyes, vat dyes, reactive dyes and so on.

At the same time, the new technology of foam dyeing and finishing was developed by combining the above dyes with new foam technology.

Challenges of environmental protection

When people wear colorful clothes to appreciate the beautiful appearance, they will also worry about the various color fastness of the fabric, and worry about the harmful substances harmful to the health of the skin contact fabric.

Stained troubles: such as sportswear, surgical clothing, tooling, protective clothing and so on.

Health concerns: at present, the production of clothing materials is entirely modern fiber chemical processing, and the toxic and harmful substances introduced into the textile and dyeing industry during the production process, no matter whether they are dyed fabrics produced by the dyeing process, such as dip dyeing, dyeing, overflow dyeing, air flow dyeing, cold pad dyeing or plain pad dyeing, are dyed and stained on the surface and inside of the fabric. This means that there are dyes on the surface and inside. When people wear clothes, human skin is in contact with dyes. Harmful substances will cause harm to people's health, which is worrying.

The toxic and harmful substances that are currently included in the monitoring range of eco textiles are: banned azo dyes: dyes that may reduce carcinogenic aromatic amines.

Carcinogenic dyes: carcinogenic dyes are dyes that can induce cancer of the body without chemical changes such as reduction.

Sensitizing dyes: certain dyes have been proved to be sensitive to human body.

Heavy metals: the source of heavy metals is the introduction of heavy metals into dye processing.

Natural plant fibers may also absorb heavy metals from soil or air during growth.

Free formaldehyde: formaldehyde has a strong stimulatory effect on skin and mucous membrane, and may also induce cancer.

Chlorophenol: pentachlorophenol (PCP) is a traditional mildew proof and preservative used in textiles.

Chlorinated organic carriers such as three chlorobenzene and two chlorobenzene are efficient dyeing carriers.

Environmental hormones: such as pentachlorophenol and polychlorinated biphenyls, there are polychlorinated dioxins, polychlorinated two benzofurans, polybrominated biphenyls, alkylphenols, p-nitrotoluene, and two phenyl phenol.

Polychlorinated biphenyl derivatives (PCBs).

Insecticide: from the residue of pesticides and textiles...

New technology of foam dyeing and finishing

In the past, most of the dyed fabrics were mainly dyed with paint, so as to achieve the purpose of one-sided dyeing.

At present, yarn dyed denim is a popular fabric that has been selling well for many years. According to the market information of natural ecological denim, Shanxi's dyed printing and dyeing has successfully developed one-sided dyed denim and casual wear fabrics.

It solves the ecological problems of jeans cloth and casual cloth, and achieves small batch and multi color.

The production of jeans, casual wear and children's clothing has been realized.

The product is full of color and rich in color. It can match the traditional yarn dyed denim.

In order to achieve the purpose of single side dyeing of woven fabrics, the following plans are adopted: first, the woven fabrics such as cotton, Tencel and elastic fabrics are pre treated, including: grey cloth, sewing, burning, cooking, bleaching, and mercerizing, followed by full width one side dyeing.

For example, one side dyeing process of imported liquid sulphur dyes is as follows: first, sulphur dyestuff paint paste glue, pretreatment, semi product, single side coloring, high temperature hot air stretching, oxidation, soap washing, water washing, drying, and falling cloth. If we want to produce cowboy garment fabrics with old feeling, we can do one side painting again.

In the above process, the one-sided dyeing of sulphur dyes and coatings can save 40% of the dye compared with the two-sided dyeing process, and at the same time, it has more flexible and diverse colors than the yarn dyed denim.

In terms of energy saving, the coloring process of paint has saved a lot of water, electricity and steam than double dyeing process of vat dyes and reactive dyes. A production line can save water 168750T, save electricity 396 thousand degrees and save steam 15320T for a year.

The annual reduction of sewage discharge is 15320T while protecting the environment.

Advantages of one side foam dyeing

The new technology is a new technology combining foam technology with reactive dyes without salt continuous dyeing.

The advantages of foam dyeing are also reflected in the fact that the bath ratio is small and the water consumption can be greatly saved.

The dosage of various dyes and auxiliaries decreased by more than 40%.

The processing time is shortened, the efficiency is improved, and the color of the fabric surface is improved.

In addition, the foam dyeing solution has less permeability to the fabric. When the foam is contacted with the fiber surface, because of the high dye concentration and less moisture in the foam, it is too late to penetrate the fiber to break the surface of the fiber evenly, so that the amount of dye on the surface of the fabric is increased, the dyestuff is reduced, the levelling property of the fabric is improved, and the dyeing wastewater is reduced.

In the research and development of Shanxi Choi printing and dyeing, it was also found that the conventional dyeing fabric had a liquid rate of 60%~80%, and the dyeing rate of foam dyeing fabric was generally 10%~40%, which could reduce dyeing wastewater treatment and reduce environmental pollution.

The reactive dyes they choose are water-soluble reactive dyes. Reactive groups in dyes can react with hydroxyl groups in natural cellulose and form a covalent bond between dyes and fibers to form dyestuff fiber colored compounds.

Moreover, it has many advantages such as complete chromatography, low price, convenient application, good levelling and strong adaptability.

In recent years, due to the development of dyestuff industry, with the improvement of reactive dyes and the introduction of new structures, the performance and various indexes have been greatly improved.

Therefore, the new technology of salt free foam dyeing developed by Shanxi Cai Jia printing and dyeing has unique advantages in the market competition, and its green environmental characteristics have attracted wide attention from the industry.