China DTY: The elastic engine and industrial innovation code of the textile industry

In the global textile industry chain, China DTY (Draw Textured Yarn, polyester low-elastic yarn) has an annual production capacity of over 20 million tons and has firmly established itself as a global production and consumption center. This textured yarn, which is made of polyester chips, spun through high-speed pre-oriented yarn (POY) and then processed by drawing and false twisting, is reshaping the diverse application scenarios from sportswear to car interiors through technological innovation and industrial upgrading.

The core technology of DTY comes from the air jet false twisting process invented by DuPont in the United States. It uses the air jet method to form irregular twisted yarn loops in the yarn bundle, giving the fiber a unique fluffy terry structure. This characteristic of both the smoothness of long filaments and the hairiness of short fibers enables DTY to maintain the high strength and wear resistance of polyester while obtaining a soft touch similar to natural fibers. After introducing the technology, Chinese companies have increased the single-line production capacity to 300 tons/year through localization of equipment and process optimization, which is 40% higher than the efficiency of the early production line.

In the production process, DTY and FDY (fully stretched yarn) form a complementary technology: FDY adopts a one-step spinning and stretching method, with high fiber orientation but limited elasticity, and is often used in simulated silk fabrics; while DTY is processed through secondary deformation, the residual elongation of the fiber reaches more than 50%, while maintaining a breaking strength of 1.2cN/dtex, and obtaining an elastic recovery rate of more than 30%. This differentiated characteristic makes DTY dominant in elastic demand scenarios such as sportswear and underwear.

In the field of clothing, spandex core-spun yarn made of DTY increases the elastic recovery rate of sports pants by 25%; in the field of home textiles, fully matte DTY made by adding anatase titanium dioxide matting agent reduces the gloss of curtain fabrics by 80%, which is closer to the natural texture; in the field of industrial fabrics, high-strength and high-modulus DTY has been used in new energy vehicle seat belts and filter materials, and its breaking strength is 40% higher than that of conventional products.

Faced with environmental pressure, China DTY companies are accelerating technology iteration. Digital transformation makes the production process more precise and controllable. Through the AI ​​visual inspection system, the defective rate of stiff yarns, K yarns, etc. has been reduced from 5% to 0.3%.

With the integration of 3D weaving technology and smart wearable devices, DTY is breaking through the boundaries of traditional textiles. In the field of construction, the wind pressure resistance of curtain walls has been improved by 50% through modified DTY reinforced composite materials. These innovative applications indicate that DTY will evolve from basic materials to functional carriers, opening up a trillion-level incremental market.

Standing at the crossroads of industrial transformation, China's DTY industry is reshaping the global textile value chain with three-dimensional breakthroughs in technology depth, application breadth, and green height. From the elastic support of sports equipment to the information transmission of smart fabrics, this seemingly ordinary deformed yarn is weaving the future picture of China's manufacturing leap to China's smart manufacturing.