Dyeing And Weaving Industry, The Key Technology Achievements Of Energy Saving And Emission Reduction, On-Site Promotion Activities Were Held In Linqing.

A few days ago, in order to promote the green and sustainable development of China's dyed fabric industry, speed up the adjustment of industrial structure, change the mode of growth, and promote the energy saving and emission reduction of the dyed weaving industry, the Ministry of science and technology development of China Textile Industry Federation and China Cotton spinning The on-site promotion of the key technology achievements of energy saving and emission reduction of the "textile light" dyeing and weaving industry organized by the trade association and the textile optical technology education foundation was held in Linqing City, Shandong province.

It is understood that China's yarn dyed fabric industry has gathered a number of high-end enterprises in the cotton textile industry. With Lu Tai textile as the benchmark, the comprehensive competitiveness of the yarn dyed fabric enterprises is higher than that of the ordinary ones. spin and weave Enterprises, but in the past two years, they are also beset by various unfavorable factors, such as falling demand for domestic and foreign sales, rising costs, and intensifying competition. Zhu Beina, President of China Cotton Textile Industry Association, said that the conference will help to promote the textile industry to readjust its industrial structure and transform its economic growth mode, and further promote the green and sustainable development of the textile and dyeing industry.

Referring to the current development of cotton spinning industry in China, Zhu Beina said that under the background of the decline of macro-economic growth at home and abroad, the key cotton textile enterprises across the country are speeding up equipment upgrading, product mix adjustment and new development. product Measures such as developing and strengthening the internal management of enterprises, so as to reduce production costs and enhance the competitiveness of enterprises.

Looking ahead to the development of the industry this year, Zhu Beina said that market demand is hard to pick up in a short period of time. Cotton textile industry and dyeing and weaving enterprises still need to focus on transformation and upgrading, such as speeding up the optimization and upgrading of production capacity, speeding up the transformation of product mix, and speeding up the integration of the upstream and downstream industrial chain of cotton textile. "Only by ensuring the competitiveness of enterprises and products can we resist the negative effects of market and policy factors and maintain a steady profit and maintain a stable, healthy and sustainable development of the dyed fabric industry". Zhu Beina said.

The meeting focused on the theme of "green development and innovative dyed weave". Participants attended the key technologies of energy saving and emission reduction, new warp foam sizing technology, key technology of cotton superfine high density elastic yarn dyed fabric, multi coloured new yarn continuous coating dyeing technology, small bath ratio single outward yarn dyeing technology and so on.

Process and auxiliaries for foam sizing of warp yarns

Promotion unit: Lu Tai textile Limited by Share Ltd

Award: the first prize of science and technology of China Federation of textile industry in 2015

At present, most fabrics need warp sizing to adapt to high-speed weaving. To this end, nearly 2 million tons of slurry are consumed each year, and a large amount of steam is needed. Warp sizing is an intermediate part of fabric production. The desizing process in printing and dyeing will produce a lot of sewage. The higher the warp sizing rate and the heavier the desizing load, the more likely the pulp will remain on the fabric. In recent years, with the development of spinning technology, the yarn quality has been significantly improved, which provides a possibility to reduce the sizing rate of warp yarns.

Foam sizing is a mixture of easy foamed slurry mixed with blowing agent and compressed air to form a more stable foam. The foam slurry is evenly applied to the warp yarn by the foaming device, squeezed by the squeezing roller, the foam is broken, and the slurry is uniformly attached to the yarn, so that the warp is soaked and covered, and the warp's weave ability is improved. On the basis of studying the theory and technology of foam sizing, the project optimizes the traditional sizing equipment, develops the foam sizing device and optimizes the sizing process.

Under the premise of ensuring the sizing quality and weaving efficiency, the technology can reduce the sizing percentage of warp yarn by 2%, and save 26.9% of the size and 21.6% of the standard coal under the condition of ensuring the sizing quality and weaving efficiency under the yarn dyed 50S single yarn and 100S below strands. In the desizing process, the amount of auxiliary agent, water consumption and treatment cost of desizing wastewater can be reduced by 34.4%, 25.4% and 10.6% respectively.

The foam sizing fabric is more comfortable than the traditional sizing, and the handle is softer than the traditional sizing fabric. The draping coefficient is 4.35% lower than that of the traditional sizing fabric, and the air permeability is higher than the traditional sizing fabric 6.7mm/s on average. The water absorption is lower than that of the traditional sizing fabric, and the oil repellent finishing level of the fabric is increased by 1.

Warp foam sizing technology can significantly reduce slurry consumption and steam energy consumption during sizing process, and achieve resource saving and low consumption reduction in sizing process. It is easy to desalter pulp and significantly reduce desizing water and sewage discharge. The popularization and application of foam sizing technology is conducive to improving the ecological processing and production technology of textile products and breaking the "green barrier" of textile exports.

Research and development of key technology of pure cotton ultra-high density elastic yarn dyed fabric

Promotion unit: Jiangsu Lian FA textile Limited by Share Ltd

Award: the first prize of science and technology of China Federation of textile industry in 2015

Yarn dyed fabric is a symbol of high-grade textile products. With the improvement of consumption level, light and comfortable become the development trend of high-grade fabrics. To be light and thin, yarns need high density and high density. To be comfortable, yarns must be elastic, and high quality elastic fabrics on the market are made of core spun yarn instead of pure cotton yarn, and it is difficult to achieve color spinning on super fine yarn.

The project optimizes the raw cotton grade and key equipment components, optimizes the pre spinning process, adopts the guide plate type siro spinning technology, designs the double channel guide plate device, optimizes the guide components, equipment and technology, and produces 360S siro spinning line steadily. The ultra-high density yarn dyed fabric has been developed by using the high efficiency dyeing system of superfine cheese, high permeability, low viscosity and high concentration sizing technology.

In addition, the project also studied the auxiliaries and special treatment systems for high efficiency dyeing before superfine cheese dyeing. By controlling the temperature and strain rate and applying the deep dyeing and rubbing fastness control technology, the strength of the 360S/2/2 strand was lower while the color and durability of the yarn were guaranteed. The project has developed a special modifier for surface treatment of super high pure cotton elastic yarn, using high permeability, low viscosity and high concentration combination slurry. The sizing process of low temperature, high pressure and medium speed can increase the sizing rate to 15%~16% and increase to 22%~24%. The weaving process parameters were systematically studied and optimized, and small weaving height, deep rear shed, high and low back beams and middle tension were adopted to make weaving process smooth, with less broken ends and nearly 80% production efficiency. Super fine dyed fabric is made of super relaxation, scouring and bleaching, mercerizing technology and liquid ammonia cross-linking and non iron finishing technology. The 360S/2/2 yarn fabric is light, smooth, mercerized, elastic, comfortable, and the elongation at break reaches as high as 25%.

Through the integrated technology research and industrialization of pure cotton ultra-fine stretch yarn dyed fabrics, the company has grasped core technologies such as Siro stress spinning, ultra-fine cheese dyeing, low damage pre-treatment, high density and high density flexible weaving, and other independent intellectual property rights. The project has applied for a number of patents.

　 Technology and equipment for continuous dyeing and finishing of multi colored new yarn

Promotion unit: Zhangjiagang Suntory dyeing and Finishing Technology Co., Ltd.

Award: 2014 China Textile Industry Federation two prize in science and technology

Aiming at the technical bottleneck of traditional pigment dyeing technology and equipment, such as low color fastness, easy to stick rollers and unstable quality, the technology of yarn dyed dyeing is systematically studied. Yarn modifiers are screened, the pigment dyeing process is optimized, special equipment is developed, and a continuous dyeing production line with continuous yarn pad dyeing, section dyeing and spray dyeing is developed through integrated innovation. The corona discharge is used to realize the rapid modification of yarns. The ultrasonic wave cavitation is used to improve the permeability and uniformity of the modifier. Through the synergistic effect of adhesive, coupling agent and fixing agent, the combination of coating and fiber is strengthened, and the color fastness, uniformity and dyeing depth of the dyed products are improved, so as to achieve the purpose of dyeing.

The technology can be used for dyeing cotton, polyester, hemp and other fibers in shallow, medium and dark colors. This technology is used for yarn dyeing. The entire production process does not exceed 1.6 tons / ton yarn. The output of waste water does not exceed 0.2 tons / ton yarn. The output of COD is not more than 0.3 kg / ton yarn, the electricity consumption is not more than 2300kWh/ ton yarn, the consumption of standard coal is not more than 265kg/ tons yarn, and the yarn loss in dyeing process is not more than 2%. Compared with the advanced level of international cleaner production, 100 tons / ton yarn, 80 ton / ton yarn, and 50 kg / ton yarn stipulated in the HJ/T185-2006 standard of cleaner production standard, the textile industry (cotton printing and dyeing) has reduced the water consumption by 98%, the amount of wastewater generated and the amount of COD generated have been reduced by 99%, and the pollution has been cut down from the source. This technology has effectively solved the technical bottleneck of pigment dyeing. The dry, wet and wet rubbing fastness of yarn in shallow, medium and dark colors has reached 4 level /3~4, 3~4 grade /3 and 3~4 grade /2~3, and the penetration and depth of dyeing have been significantly improved.

The project can achieve high efficiency flower dyeing and can achieve simultaneous dyeing of multi component fibers. The continuous coloring and dyeing technology of multi colored new yarns can not only produce dyed yarns with rich flower shaped effects such as color segments and coloured dots, but also realize synchronous dyeing of cotton, polyester, hemp, nitrile, wool and other components blended yarn, thus greatly improving the adaptability of dyeing objects.

　 Small bath ratio one way outer flow cheese dyeing technology

Promotion unit: Lixin dyeing and finishing machinery (Shenzhen) Co., Ltd.

Award: 2015 China's cotton textile industry energy saving and emission reduction technology and innovative application directory (third batch)

In the dyeing process of cotton spinning industry, how to save water and reduce the discharge of sewage has become an important factor restricting the development of yarn dyed enterprises in cotton textile industry. The small bath has made a breakthrough in saving water and reducing emissions. The technology combines self-developed wave dyeing and pulse control frequency conversion technology, and uses the main pump to generate pressure difference through a specific rhythm changing frequency, so that the cheese can be dyed in unidirectional dyeing state to achieve two-way dyeing effect, and can effectively prevent the deformation of the cheese yarn, improve the dyeing efficiency and improve the yarn handle.

In the cotton textile industry, the ratio of cheese dyeing to 1 to 6 is considered to be a small bath ratio dyeing. With this technology, the lowest bath ratio can be as low as 1: 3 for cheese dyeing. In the pure cotton variety dyed black process, the bath ratio is 1: 3.5, saving 59.4%, saving electricity 58.6%, saving steam 76.7%, saving auxiliary 38.5%.

The small bath ratio dyeing of cheese yarn is mainly achieved by the improvement of dyeing process, the improvement of equipment structure and properties, and the optimization of the design. The small bath ratio dyeing technology can obviously shorten the dyeing time of the cheese and reduce the energy consumption. It is one of the most direct and effective means to achieve energy saving and emission reduction in cheese dyeing by increasing the utilization efficiency of dyes and chemicals and reducing the discharge of sewage.

With the continuous development of cheese dyeing technology, the production and processing of cheese dyeing is developing towards cleaner, more environmentally friendly and sustainable products. In the process of dyeing, the small bath ratio dyeing technology of the bobbin not only saves a lot of water, electricity and steam, reduces the discharge of dyed yarn wastewater, saves a lot of energy, but also improves the utilization efficiency of dyes and auxiliaries, reduces the amount of dyes and auxiliaries in dyeing wastewater, and reduces the difficulty and cost of sewage treatment. Whether it is from the social or financial benefits, it has benefited cotton textile enterprises and greatly enhanced the market competitiveness of cotton textile enterprises.