This project belongs to the field of textile science and engineering. The textile industry is my country's pillar industry, providing more than 200 million employees and accounting for more than 20% of foreign exchange earned from exports. However, the textile industry has widespread bottleneck problems such as fierce competition for low-end homogenization, low preparation levels of high value-added and high-functional products, and heavy reliance on imports. High-functional textiles usually adopt post-finishing methods such as functional particle coating, impregnation, and grafting, which not only damages the fiber body, affects the style and performance of the textile, but also has problems of poor durability and insufficient application. In order to solve this situation, my country's textile industry conducted in-depth discussions during the 13th Five-Year Plan. Supported by the National Science and Technology Support Plan, the National Self-Science Fund and the Shanghai City Science and Technology Commission, this project team has gone through more than ten years of research and has achieved the goal of embedding functional submicron fibers in textiles to replace existing functional particle technology, and integrating low-proportion (less than 1%) submicron fibers as the carrier into knitting, weaving, non-woven and other textiles. A series of achievements have been achieved in the research. The main inventions are as follows: (1) The dynamically balanced spatially symmetric free surface spinning assembly was invented, and the controllable jet drawing narrow distribution fiber preparation theory and the multi-jet control theory were established, which solved the problem of traditional needle electrostatic spinning preparation. The yield of submicron fiber is extremely low, and the problems of clogging, multi-jet interference and large dispersion of fiber diameters are common. Large-scale continuous production of narrowly distributed sub-micron fibers is realized. Through precise control of jet stretching, the diameter CV value is reduced from 30-50% to less than 15%, and the submicron fiber production capacity of a single spinning module reaches 150m2/hour, which is more than 500 times that of a single needle. (2) A phase-compensated multi-module screening and high-orientation screening technology has been developed, which solves the problems of uncontrollable gradient structure in the thickness direction of the fiber web and difficulty in uniform web formation in the width direction, and realizes a variable proportion of sub-micron fiber gradients. Embedded into the web (accounting for less than 1% of the web weight). The developed hot air embedded production line can prepare high-efficiency low-resistance sub-micron nonwoven filter materials with filter efficiency>99.99998% and filter resistance <106Pa; the developed high-orientation web forming technology has an orientation degree of greater than 80%, and is straight and parallel with the cotton web. Good consistency, and the production capacity reaches more than 1.5 million m2/year. (3) Invented the sub-micron continuous ldquo; mixed-rdquo; spinning technology with local ionization layering and inverted web triangular curling. After locally controllable ionization of the traditional fiber web, it is layered and embedded into short segments of sub-micron fibers to achieve microscopic inlay at the level of action between the two macromolecules, breaking through the problem of uniform embedding between fibers into strips with a linear density difference of 10000 times. It can be continuously produced at a linear speed of 100 meters/minute and can be used for knitting and weaving sub-micron fiber blended yarns. (4) A guanidine salt hydrogel with permanent antibacterial effect was developed. By preparing low-proportion multi-level diffusion hydrogel antibacterial inlaid blended yarn, antibacterial submicron fibers with a weight percentage of less than 1% were embedded into traditional cotton fabrics, solving the problem. Traditional antibacterial cotton spinning products have unstable functions, poor durability of effects, and large loss of serviceability. While taking into account high efficiency, green, low energy consumption, and no fiber damage, the antibacterial agent content is less than 5 kg, the antibacterial rate of the fabric is more than 99%, and the antibacterial rate is still more than 98% after 50 washes. This project has been authorized to have 44 national invention patents, 18 utility models, formulated 4 industry standards, and published 84 SCI papers, forming a complete intellectual property system. The results of the project have been promoted and applied, with a total investment of 110 million yuan, forming 9 ionized inlaid blended production lines, 2 sub-micron fiber hot air embedded non-woven production lines with 20,300 tons of sub-micron fiber antibacterial blended yarns, and 3.1 million square meters of sub-micron non-woven fabric. The appraisal results are at the international advanced level. In the past three years, new sales of related products have reached 601.6 million yuan, and new profits have reached 79.7052 million yuan.