Denim: A Blue Legend Through Thousand Years
Basic knowledge about denim fabrics:
Denim is a thicker yarn-dyed warp-face twill cotton fabric. The warp yarns are dark in color, usually indigo blue, and the weft yarns are light in color, usually light gray or scoured. This white yarn. Also known as indigo labor cloth. In fact, at first, denim was only used as canvas because denim is more wear-resistant. But then denim was introduced to the United States, and it started a fashion journey. The mythical kingdom of Levi’s jeans is what we have to mention. The rough canvas originally used to make civilian tents was used to create a pair of LeviS strong trousers for the miners at that time. A kind of tough and durable work clothes, it quickly became popular because it was very suitable for the needs of workers, which triggered a series of evolutions. . That’s when denim entered our lives. In fact, the denim pants were mainly brown at first, and were later changed to dark blue twill fabric (Denim).
The current progress and extension of denim fabrics:
Denim is no longer the simple workwear it was in the beginning. Now many denims have started a high-end and smart evolution. First of all, what we want to gain is high-end customized denim in recent years. This kind of denim; uses fashion to counter fashion. Denim is a very representative thing in the fashion industry. Everyone has one and it’s not expensive. Sometimes we wonder why a piece of sturdy trousers that is both comfortable and beautiful cannot be cherished like a high-end customized skirt. Therefore, high-end customized slow denim began to appear in people’s field of vision. The high-end route of denim is also about playing with the fabric world.
In recent years, the pollution problem of denim finishing has attracted widespread public attention, and the denim industry is facing severe challenges. The dyeing and finishing of denim workwear consumes a lot of water and wastewater, and the concentration of pollutants in the wastewater is very high. Under today’s environmental protection trends, production methods that sacrifice the environment will be gradually eliminated. Major denim manufacturers have begun to introduce new technologies, new equipment, and new additives in order to achieve green transformation progress.
Introduction to environmentally friendly technologies for denim finishing processes:
(1) Silica alkali recovery technology
In order to increase the durability of cotton fiber and improve the dimensional stability of the fabric, it is necessary to use caustic soda to finish the cotton fiber. After spinning, the residual alkali on the cotton fibers is washed down. The concentration of these waste alkali is about 40 to 50g/L. If not recycled, it will not only cause waste, but also greatly increase the difficulty of sewage treatment. Due to its economic and environmental benefits, silk alkali recovery equipment has gradually become popular among printing and dyeing enterprises.
(2) Resource utilization of printing and dyeing wastewater
Printing and dyeing wastewater has the characteristics of large color, large changes in COD, high alkalinity, poor biodegradability and large changes in water temperature. It has become one of the main sources of water pollution in my country. At present, the resource utilization of printing and dyeing wastewater is less than 10%, which is far lower than other industries. Treat denim finishing wastewater so that major indicators such as CODcr, suspended solids concentration, pH value, and chromaticity meet the standards for production water or reclaimed water reuse in each process, and can be used for coloring, rinsing, greening, cleaning, etc., thereby improving Resource utilization and reduction of sewage discharge will help improve the greenness of denim production methods.
(3) Foam technology
Foam technology is to use a small amount of liquid, mix air into the liquid through certain equipment and foaming agent, form a metastable foam required by foam dyeing and finishing technology, and apply the foam in a uniform state to A new dyeing and finishing technology on fabrics to achieve the desired effect. Foam dyeing and finishing technology is a typical low-liquid-feeding and energy-saving process. It can evenly distribute chemicals under small moisture supply conditions, which is fully in line with the development direction of green dyeing and finishing.
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