Color spinning is an important direction for the future development of Henan textile industry

Color spinning is an important direction for the future development of Henan textile industry

On August 31st, at the “2012 Henan Textile High-level Forum”, Dr. Zheng Zheng of Zhongyuan Institute of Technology evoked the attention of delegates to the speech about colored spinning yarn and colored viscose fiber. The 365 Yarn Network reporter interviewed Zheng Hao and asked him to explain in detail the development of colored spinning yarns and colored viscose fibers.

Reporter: What are the benefits of dyed yarns and colored viscose fibers for reducing environmental pollution, energy saving and environmental protection?

Zheng Zheng: Color spinning yarns are dyed or dyed before spinning, so the yarns are not dyed after being knit and woven into fabrics after being spun into yarns, which shortens the processing procedure and reduces the number of yarns. Environmental pollution, in line with the requirements of green environmental protection.

Color spinning dyes only 35% to 40% of cotton, l00% colored cotton yarn can be obtained through blending, and the production cost of the entire industrial chain is reduced. If the colored chemical fiber obtained by the liquid coloring technology is used as a raw material for color spinning, the production process can be “zero emission”.

Reporter: What is the development of dyed yarn?

Zheng Wei: Color spinning yarn originated in Europe, the earliest applied to wool spinning, and later gradually promote the application of cotton spinning, hemp spinning and other industries.

The color spinning industry started late in the country and is a new branch of the textile industry. After the color spinning products were gradually introduced into China, the color spinning industry received extraordinary development. In 1984, color spinning was basically blank. However, after entering the 1990s, color spinning has entered a period of rapid development. The production capacity of color spinning yarn has increased from about 100,000 ingots in the early stage to about 3 million ingots in 2009, and has become the dominant player in the world's color spinning yarn market. According to 365 Yarn Network, the production capacity of domestic colored spinning yarns has been increased to 6 million spindles.

Reporter: Since the color spinning yarn is developing so fast, what are its characteristics and advantages?

Zheng Hao: Manufacturing products from colored spinning yarns is conducive to environmental protection and energy-saving production for downstream users. From spinning to weaving, compared with other processes, yarn spinning can reduce nearly 1/3 of the waste water discharge, and has obvious advantages in terms of saving energy and steam.

Color spinning products are fashionable in color. The origin of color spinning is the natural color. In the spinning process, fibers of different colors are fully and evenly mixed and then spun into a colored yarn with a unique color mixing effect. Mixed-color spinning obtains a unique color through the blending of color fibers and presents a "space-mixing" effect. The color is transparent and rich, and there are levels of change, rich in three-dimensionality, and thus produce the artistic effect people hope. Color spinning fabrics are subtle and natural after being made into garments, and have a strong sense of jealousy. This natural, returning style is in line with modern personalized, diversified, and fashionable clothing trends and consumer trends.

Color spinning can achieve a variety of raw materials blended, more abundant and more competitive products. The color spinning process can make yarns made from cotton, hemp, wool, silk, chemical fiber, and other raw materials blended, and combined with the interpretation of fashion colors, it can provide a steady stream of innovative products.

Reporter: Where are the technical innovations of colored viscose fibers?

Zheng Hao: The production of 1 ton of dyed cloth or dyed yarn using conventional techniques usually consumes 100 tons of water, 500 degrees of electricity, and 6 cubic meters of steam, while the production process of colored viscose fibers is comparable to that of white viscose fibers. Only 0.2 tons of water and 5 kWh of electricity are added, no steam is consumed and no sewage is generated. For the production capacity of more than 2 million tons of viscose staple fiber in the country, the social value and environmental benefits of the process will be incalculable.

Its technical innovation is to start dyeing from the production source of viscose fibers and produce four monochromatic viscose staple fibers instead of the traditional white viscose staple fibers.

Then, the four primary color fibers are combined in proportions to produce yarns of various colors in the downstream color spinning enterprises, and finally weave and dress. The process removes the traditional dyeing process, which is suitable for viscose fiber enterprises with a single type of stable, high-volume production, and also meets the production characteristics of downstream colored yarn production enterprises with many varieties and small production volumes. Traditionally, there has been an inconsistency between the two in color and production.

Colored viscose fiber has obvious advantages in the market. The first is energy conservation and emission reduction. The coloring process of "primary liquid coloring" type viscose fiber has low energy consumption, less pollution, does not consume steam, and does not produce sewage. The second is low processing costs. The fiber "post-dyeing" costs an average of 7,500 yuan per ton, while the "liquid coloring"-type colored viscose fiber only increases by 4,000 yuan per ton compared to the white viscose fiber. Even if we do not calculate the effluent discharge cost and the impact on the environment, we will make the products of color spinning companies more competitive and more profitable.

The third is high color fastness. The color fastness of the “post-dyed” type colored fibers averaged around Grade 3, while the color fastness of the “liquid-colored” type colored viscose fibers was all above Grade 4.

The fourth is good spinnability. After the dyeing of the "dyeing-up" type colored fiber, the loss of strength is large, which is not favorable for the spinning process, while the "liquid coloring"-type colored viscose fiber can maintain the same mechanical properties as the ordinary viscose fiber and has good spinnability.

Fifth, the performance of the blended fabric is better. The addition of 10% to 30% of colored cellulose fibers to cotton-colored fabrics will give the fabrics better feel, hygroscopicity, and comfort, and will increase the crease resistance of the fabric.

Reporter: What are the positive significance of these two products for Henan's textile restructuring and homogenization?

Zheng Zheng: Henan textile industry should have its own characteristics. At present, 95% of the products in Henan's spinning companies are medium and low-grade cotton yarns. The homogenization is serious and the competitiveness in the market is not strong. Henan should have a distinct regional product positioning. The color spinning industry has increased its size by 10 times in the past 10 years and has grown by an average of 22% to 30% annually. Color spinning is an important direction for future development.

Fabric production has always been a shortcoming for the development of Henan's textile industry. As an inland province, there is a congenital deficiency in the development of printing and dyeing industry in Henan, and the lack of water and consideration of environmental impacts has made it impossible for Henan to vigorously develop printing and dyeing capacity. Henan textile industry must embark on a road of development with its own characteristics. The formation of a "colored viscose fiber - viscose colored spinning yarn - color spinning fabric" industry chain will be a good choice.

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