Relying on the advantages of polyester fiber in China, through scientific design and high-efficiency modification, we can realize the moisture absorption and wicking technology and product upgrade, support the development of modern sports and leisure fabrics, and the special-shaped fine-wet moisture-absorbing and wicking polyester fiber stands out.  
As one of the top ten fiber varieties in the 2012/2013 China fiber fashion trend, the name of the special-shaped fine-wet moisture-absorbing wicking fiber should be familiar to many people. However, it is such a new type of fiber, which relies on its profiled section and utilizes numerous micropores or grooves on the surface, combined with fine denier, so that the fiber can quickly absorb moisture and sweat on the surface of the skin, and spread to the outer layer by diffusion. It can achieve the effect of moisture wicking. Combined with anti-ultraviolet, antibacterial and other multi-functional composites to further enhance the function of the fiber, the special-shaped fine-wet moisture-absorbing and wicking polyester fiber has become a kind of fiber which is favored by sports brand buyers.  
Special section for comfort  
The functional principle of the shaped fine denier moisture wicking polyester fiber is mainly derived from the fiber cross section of the variant. The highly profiled fiber cross-section and the fluffy yarn structure add to the "capillary tube" effect of the yarn. Capillary channels on fabric fibers or between fibers can quickly absorb, transport, diffuse and volatilize moisture, thereby keeping the skin dry. The fine fibers on the surface of the fine fiber textile form numerous innumerable concave and convex structures, which are equivalent to numerous capillary channels. Therefore, the absorption effect of the fabric is obviously increased, which can play the role of transferring water molecules, greatly improving the breathability and sweat of the fabric. performance. Compared with the conventional moisture wicking fiber, the fine denier shaped fiber has fineness, large specific surface area, and a grooved structure, which can greatly improve the moisture absorption and desorption of the polyester fiber, and the comfort is also greatly improved.  
In terms of preparation, the polymer manufacturing stage of the shaped fine denier moisture wicking fiber lays a foundation for the production of fibers for high moisture absorption and perspiration fabric during polymer polymerization. In the fiber manufacturing stage, the hydrophilic polymer is spun, the shape of the spinneret is changed to prepare the shaped fiber, the groove is formed in the longitudinal direction of the shaped fiber, and the microfiber preparation technology is combined to further provide the moisture absorbing and wicking function of the fiber. From the current moisture wicking fiber, it is mainly the spinning of "10", "Y", "U" shaped and other shaped fibers. In the yarn and fabric manufacturing stage, it is blended with fibers with excellent water absorption properties or composed of hydrophilic fibers and hydrophobic fibers. The inner layer is composed of hydrophobic moisture-conducting fibers, and the outer layer is wicking and sweat-wicking. Dry fiber composition.  
The shaped fine denier moisture wicking fibers formed by the polymer polymerization, spinning, yarn and fabric weaving, integration and other processing stages combine the comfort of cotton and the quick drying of polyester, and are quick-drying, dry and breathable. Moreover, the high profile section structure makes it 25% lighter than ordinary polyester, and has the characteristics of light and comfortable. It is a good material for making tights and sportswear.  
Breakthrough in product fineness  
The main technical bottleneck in the development of special-shaped fine-wet moisture-absorbing and wicking polyester fiber in China is still the problem of fiber forming theory and specializing the processing precision of spinneret. The design of high-precision shaped porous spinneret requires the support of spinning fluid mechanics theory, and the special shape The processing of cross-section porous spinnerets requires high-precision spinneret processing technology. These are the theories and techniques that technicians in China's chemical fiber industry need to gradually improve in their future work. In the technical level of special-type fine-wet moisture wicking polyester fiber, there is still a certain gap between China and abroad, mainly in the following: the specific surface area of ​​the fiber is not large, the cross-sectional shape is relatively simple, and only the cross shape and the Y-shaped cross section are in the moisture wicking function. There have been more developments, and foreign countries have developed flat sections.  
But this gap is shrinking. According to reports, in March 2003, Suzhou Jinhui Fiber New Material Co., Ltd. began to increase the development of the moisture absorption and perspiration function of polyester fiber. There are still some technical obstacles in spinning production, and the fiber can not be finely denated. It is much higher than ordinary products, and the promotion of moisture wicking products is subject to certain restrictions. Nowadays, in the production method, due to the breakthrough of the ring blowing technology, fine denier and ultrafine fibers have been industrialized. In addition, the current shaped fine denier moisture wicking polyester fiber also combines some other functions, such as the addition of nano-powder through the combination of profiled sections, the addition of fiber value by means of component control, fiber structure control, etc. Have a better market effect.  
Fine denier moisture wicking polyester fiber also has its own insurmountable shortcomings. Each surface of the fine fibers has a certain amount of reflected light, so the finer the fiber fineness, the more difficult it is to dye the dark color, and the dyeing unevenness is also easy. Compared with conventional polyester fiber, the light fastness of fine fiber is 1~2 grade lower. The finer the fiber, the larger the surface area, the more the light fastness decreases.  
Significant achievements in industrialization development  
According to experts' predictions, outing casual wear will guide the sports and leisure market to reach a growth rate of 30%. Therefore, the special-shaped fine-wet moisture-absorbing and wicking polyester fiber has unlimited potential for future sports market and sportswear. A group of enterprises represented by Jiangsu Hengli Chemical Fiber Co., Ltd., Jiangsu Shenghong Technology Co., Ltd. and Suzhou Jinhui Fiber New Material Co., Ltd. are committed to the development and industrialization of such fibers, and have achieved good results.  
Shenghong Technology has made remarkable achievements in the development of fiber cross-section morphology, and has developed the development of moisture-absorbing and wicking polyester fibers such as “three-leaf” shape, “five-leaf” shape, “ten” shape, “W” shape and composite shape. And taking advantage of the company's ring blowing technology, using a new professionalized fine-denier porous spinneret design, successfully developed a variety of special-shaped fine denier moisture wicking polyester fiber. At present, Shenghong produces more than 20,000 tons of various types of fine-density moisture wicking polyester fiber, and has formed a well-known brand "ice rainbow".  
In terms of fiber fineness, the development of Jiangsu Hengli Chemical Fiber Co., Ltd. has received attention. The project “Key Technology Development of High Quality Melt Direct Spinning Superfine Denier Polyfilament Filament” won the second prize of National Science and Technology Progress Award. Hengli cooperates with domestic and foreign experts. After years of research, the monofilament fiber fineness is 0.3 denier, which is equivalent to 1/20 of a hair.  
The temperature-regulating silk developed by Suzhou Jinhui Fiber New Material Co., Ltd. imparts functional properties such as antibacterial, anti-ultraviolet, and cool to the special-type fine-wet moisture-absorbing and wicking polyester fiber, and further strengthens the characteristics of moisture-absorbing and wicking fibers.  
Faced with increasing pressure on industrial upgrading, chemical fiber companies have placed the development and promotion of high-tech and high value-added products in a very important position. Shaped fine denier moisture wicking fiber will be the focus of future differential fiber development. As a major breed of high-comfort fiber, it is expected that the global production of special-shaped fine-wet moisture-absorbing and wicking polyester fiber will gradually reach or exceed 2 million tons. At present, Hengli Chemical Fiber's special-shaped fine-density moisture-absorbing and wicking fiber has cooperated extensively with well-known companies such as Buick, Honda and Li Ning, and has achieved good results. The person in charge of Shenghong Technology also said that the company's special-shaped fine-wet moisture-absorbing and wicking polyester fiber has established long-term use agreements with well-known brands such as Nike, Adidas and Li Ning. In the future, they will gradually increase this category. The strength of product development and promotion makes this new fiber play a greater role.  

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