Low-carbon ecological single-side dyeing process
Implementation of ecological safety, energy saving and environmental protection production. As a typical chemical treatment process, the textile dyeing and processing of textiles has always attracted people’s attention to energy consumption, environmental impacts, and the ecological safety issues that consumers may bring. This, in turn, relates to textile printing and dye processing and some pre-processing and post-processing. Finishing processing is closely related. Therefore, the innovation of the printing and dyeing process is imperative.
After careful research and development, Shanxi Caijia Printing and Dyeing Co., Ltd. successfully tested single dyeing, vat dyes, and reactive dyes for single (surface) dyeing. At the same time, the above-mentioned dyes and foam technologies were combined to develop new technologies for foam dyeing and finishing.
Eco-environmental challenge When people wear colorful clothes to enjoy the beautiful appearance, they will also be troubled by the good color fastness of the fabric, and they are concerned about the health hazards of the toxic and harmful substances contained in the fabric.
Staining troubles: such as sportswear, surgical clothing, tooling, protective clothing and other stains on the underwear. Health concerns: At present, the production of apparel fabrics is entirely a modern fiber chemical processing. The toxic and harmful substances introduced by the textile printing and dyeing industry during the production process are all dyed fabrics produced by the dyeing method, such as dyeing and dyeing. Overflow dyeing, airflow dyeing, cold dusting, or flat pad dyeing, dyed fabrics are dyed on the surface and inside. This means that dyes are present both on the surface and inside, when people wear clothes The human skin is in contact with the dye. The toxic and harmful substances will cause harm to people's health and cause concern.
The toxic and harmful substances that are currently included in the monitoring range of ecological textiles mainly include: Disabling azo dyes: refers to dyes that may have reduced carcinogenic aromatic amines. Carcinogenic dyes: Carcinogenic dyes are dyes that can induce cancer in humans without chemical changes such as reduction. Sensitizing dyes: Certain dyes have been shown to have sensitization in humans. Heavy metals: Their source is the introduction of some heavy metals in dye processing. Natural plant fibers may also absorb heavy metals from the soil or air during the growth process. Free Formaldehyde: Formaldehyde has a strong irritant effect on the skin and mucous membranes and may also induce cancer. Chlorophenols: **** (PCP) is a traditional mildew preservative used in textiles. Chlorinated organic carriers: such as trichlorobenzene, dichlorotoluene, etc. are highly efficient dyeing vehicles. Environmental hormones: such as ****, polychlorinated biphenyls, polychlorinated dibenzofurans, polychlorinated dibenzofurans, polybrominated biphenyls, alkylphenols, p-nitrotoluenes, p-diphenylphenols, etc. Polychlorinated biphenyl derivatives (PCBs). Insecticides: residues from pesticides and textiles...
New technologies for foam dyeing and finishing Single-sided dyeing In the past, most paints were mainly coated with color paste to achieve single-sided dyeing.
At present, yarn-dyed denim fabrics are the best-selling conventional fabrics for many years. According to consumer demand for natural ecological denim market information, Shanxi Caijia Printing and Dyeing has successfully developed single-sided dyed denim and casual wear fabrics. Solve the ecological problems of denim fabrics and casual fabrics, and also achieve small batches and multiple colors. A series of production of jeans, casual wear and children's wear was realized. The product is full of rich colors, rich colors, and can be completely comparable to the traditional yarn-dyed denim. In order to achieve the purpose of unilateral dyeing of woven fabrics, the following solutions are adopted: First, woven fabrics such as pure cotton, tencel, and elastic fabrics are subjected to pretreatment, including: grey fabrics→stitching→singing→exfoliation→bleaching→mercerizing; Single-sided staining. For example, the process of dyeing single-side dyes for imported liquids*: dyeing of the dyes in the first place, pre-treatment of semi-finished products, single-side coloring, high-temperature hot air stretching, oxidation, soaping, washing, drying, and falling fabrics. Production of old-fashioned denim garments can be done with single-sided paint, and the finished garments are washed to achieve the desired denim effect.
In the above process implementation, the dyeing of one side of the dye and the paint can save 40% of the dye compared to the double-side dyeing process, and at the same time, it has richer and more flexible colors than the dyed cowboy. In terms of energy saving, the coating coloring process saves a lot of water, electricity, and steam compared with the double-sided dyeing process of vat dyes and reactive dyes. In one production line, water consumption is 168,750T, energy-saving is 396,000 degrees, and steam is 15320T. The reduction of sewage discharge for the whole year was 15320T while protecting the environment.
Advantages of Single-Side Foam Dyeing This new technology is a new technology that combines foam technology with continuous salt-free dyeing of reactive dyes.
The advantages of foam dyeing are also reflected in the fact that the bath ratio is small, which can greatly save water consumption. Significantly reduce the amount of various dye additives above about 40%. Shorten the processing time, increase the efficiency, and increase the color yield of the fabric surface.
In addition, the foam-dyed dyeing solution has a low permeability to the fabric. When the foam is in contact with the surface of the fiber, the dye concentration in the foam is high and the moisture content is low, so that it will not penetrate the fiber and break evenly on the surface of the fiber. The surface color yield is increased, dye migration is reduced, leveling of the fabric is increased, and the amount of dyeing wastewater is reduced.
In the research and development, Shanxi Caijia Printing and Dyeing Co., Ltd. also found that the liquid dyeing rate of conventional dyeing fabrics is generally 60% to 80%, and the liquid dyeing rate of foam dyed fabrics is generally 10% to 40%, which can reduce the amount of dyeing wastewater treatment and reduce the environmental pollution. The reactive dye they chose was a water-soluble reactive dye. The reactive groups in the dye react chemically with the hydroxyl groups of natural cellulose, etc., resulting in the formation of a covalent bond between the dye and the fiber. "Colored compounds. And it has complete chromatogram, low price, convenient application, good leveling and good adaptability.
In recent years, due to the development of the dyestuff industry, reactive dyes have been improved and the introduction of new structures has greatly improved performance and various indicators. Therefore, the new salt-free foam dyeing technology developed by Shanxi Caijia Printing and Dyeing has unique advantages in the market competition, and its green environmental protection characteristics have attracted wide attention from the industry.
After careful research and development, Shanxi Caijia Printing and Dyeing Co., Ltd. successfully tested single dyeing, vat dyes, and reactive dyes for single (surface) dyeing. At the same time, the above-mentioned dyes and foam technologies were combined to develop new technologies for foam dyeing and finishing.
Eco-environmental challenge When people wear colorful clothes to enjoy the beautiful appearance, they will also be troubled by the good color fastness of the fabric, and they are concerned about the health hazards of the toxic and harmful substances contained in the fabric.
Staining troubles: such as sportswear, surgical clothing, tooling, protective clothing and other stains on the underwear. Health concerns: At present, the production of apparel fabrics is entirely a modern fiber chemical processing. The toxic and harmful substances introduced by the textile printing and dyeing industry during the production process are all dyed fabrics produced by the dyeing method, such as dyeing and dyeing. Overflow dyeing, airflow dyeing, cold dusting, or flat pad dyeing, dyed fabrics are dyed on the surface and inside. This means that dyes are present both on the surface and inside, when people wear clothes The human skin is in contact with the dye. The toxic and harmful substances will cause harm to people's health and cause concern.
The toxic and harmful substances that are currently included in the monitoring range of ecological textiles mainly include: Disabling azo dyes: refers to dyes that may have reduced carcinogenic aromatic amines. Carcinogenic dyes: Carcinogenic dyes are dyes that can induce cancer in humans without chemical changes such as reduction. Sensitizing dyes: Certain dyes have been shown to have sensitization in humans. Heavy metals: Their source is the introduction of some heavy metals in dye processing. Natural plant fibers may also absorb heavy metals from the soil or air during the growth process. Free Formaldehyde: Formaldehyde has a strong irritant effect on the skin and mucous membranes and may also induce cancer. Chlorophenols: **** (PCP) is a traditional mildew preservative used in textiles. Chlorinated organic carriers: such as trichlorobenzene, dichlorotoluene, etc. are highly efficient dyeing vehicles. Environmental hormones: such as ****, polychlorinated biphenyls, polychlorinated dibenzofurans, polychlorinated dibenzofurans, polybrominated biphenyls, alkylphenols, p-nitrotoluenes, p-diphenylphenols, etc. Polychlorinated biphenyl derivatives (PCBs). Insecticides: residues from pesticides and textiles...
New technologies for foam dyeing and finishing Single-sided dyeing In the past, most paints were mainly coated with color paste to achieve single-sided dyeing.
At present, yarn-dyed denim fabrics are the best-selling conventional fabrics for many years. According to consumer demand for natural ecological denim market information, Shanxi Caijia Printing and Dyeing has successfully developed single-sided dyed denim and casual wear fabrics. Solve the ecological problems of denim fabrics and casual fabrics, and also achieve small batches and multiple colors. A series of production of jeans, casual wear and children's wear was realized. The product is full of rich colors, rich colors, and can be completely comparable to the traditional yarn-dyed denim. In order to achieve the purpose of unilateral dyeing of woven fabrics, the following solutions are adopted: First, woven fabrics such as pure cotton, tencel, and elastic fabrics are subjected to pretreatment, including: grey fabrics→stitching→singing→exfoliation→bleaching→mercerizing; Single-sided staining. For example, the process of dyeing single-side dyes for imported liquids*: dyeing of the dyes in the first place, pre-treatment of semi-finished products, single-side coloring, high-temperature hot air stretching, oxidation, soaping, washing, drying, and falling fabrics. Production of old-fashioned denim garments can be done with single-sided paint, and the finished garments are washed to achieve the desired denim effect.
In the above process implementation, the dyeing of one side of the dye and the paint can save 40% of the dye compared to the double-side dyeing process, and at the same time, it has richer and more flexible colors than the dyed cowboy. In terms of energy saving, the coating coloring process saves a lot of water, electricity, and steam compared with the double-sided dyeing process of vat dyes and reactive dyes. In one production line, water consumption is 168,750T, energy-saving is 396,000 degrees, and steam is 15320T. The reduction of sewage discharge for the whole year was 15320T while protecting the environment.
Advantages of Single-Side Foam Dyeing This new technology is a new technology that combines foam technology with continuous salt-free dyeing of reactive dyes.
The advantages of foam dyeing are also reflected in the fact that the bath ratio is small, which can greatly save water consumption. Significantly reduce the amount of various dye additives above about 40%. Shorten the processing time, increase the efficiency, and increase the color yield of the fabric surface.
In addition, the foam-dyed dyeing solution has a low permeability to the fabric. When the foam is in contact with the surface of the fiber, the dye concentration in the foam is high and the moisture content is low, so that it will not penetrate the fiber and break evenly on the surface of the fiber. The surface color yield is increased, dye migration is reduced, leveling of the fabric is increased, and the amount of dyeing wastewater is reduced.
In the research and development, Shanxi Caijia Printing and Dyeing Co., Ltd. also found that the liquid dyeing rate of conventional dyeing fabrics is generally 60% to 80%, and the liquid dyeing rate of foam dyed fabrics is generally 10% to 40%, which can reduce the amount of dyeing wastewater treatment and reduce the environmental pollution. The reactive dye they chose was a water-soluble reactive dye. The reactive groups in the dye react chemically with the hydroxyl groups of natural cellulose, etc., resulting in the formation of a covalent bond between the dye and the fiber. "Colored compounds. And it has complete chromatogram, low price, convenient application, good leveling and good adaptability.
In recent years, due to the development of the dyestuff industry, reactive dyes have been improved and the introduction of new structures has greatly improved performance and various indicators. Therefore, the new salt-free foam dyeing technology developed by Shanxi Caijia Printing and Dyeing has unique advantages in the market competition, and its green environmental protection characteristics have attracted wide attention from the industry.
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