Introduction:Currently, the world economic structure is in a stage of profound adjustment. At the same time, a new round of scientific and technological revolution and industrial transformation are accelerating, and the superimposed effect of the two is obvious. On the one hand, the trend of breakthroughs and cross-integration in multiple disciplines is becoming increasingly obvious. Information networks, biotechnology, clean energy, new materials and intelligent manufacturing and other fields are showing a trend of collective advancement, constantly giving birth to new industries, new models and new business formats; on the other hand, Major countries in the world are accelerating the deployment of new industries and new business formats. By increasing investment in scientific and technological innovation, making full use of the opportunities of technological revolution and industrial transformation, and accelerating the cultivation of new momentum, they will seize the commanding heights of future economic and industrial competition. Relevant research shows that from now to around 2040, it will be a critical period for the development of the new scientific and technological revolution, bringing about profound changes in the world’s development pattern.
High-value mainly involves high-performance fibers, nanofibers, functional fibers, as well as process technology, equipment and raw materials that support the production of low-cost, high-end products. Among them, the field of materials is one of the main targets for high-value research and utilization.
High value fiber
At this stage, the ways to increase the value of fiber tend to be diversified, mainly including major innovations in process technology, energy conservation and environmental protection, low cost, product serialization, high performance, nanotechnology, intelligence and personalized design. The development and application of new high-value fibers is a trend but has not yet become mainstream. In the past few decades, only a few varieties such as PA56 fiber and PA9T have appeared in the field of civilian fibers. In the field of high-performance fibers, only polyketone and heterocyclic M5 have appeared. fiber and has not yet been produced on a large scale.
Successful cases of high-performance general-purpose fibers are the processing of ultra-high molecular weight resins into products by gel spinning and other methods, such as polyethylene (PE) and polyvinyl alcohol (PVA) fiber K2, etc., as well as products made of PE, Hollow fiber separation membranes such as polypropylene (PP), polyacrylonitrile (PAN), and PVA are further processed into high-value separation components. For example, Innegra Technologies has launched Innegra, an ultra-high modulus PP fiber with a density of only 0.84g/cm3, which can be processed into ultra-light bulletproof products; the American company Plascore uses high-strength and high-modulus PP fiber to further process it into Lightweight, strong, high toughness and relatively low-cost PP honeycomb structure material.
Plascore PP honeycomb material
A manufacturer in Taiwan that produces PAN pre-oxidized fiber (POFF) developed a suit made of POFF and para-aramid fiber blended a few years ago. It is dark green with black grid and has a beautiful appearance. It is made of 1250℃ oxyacetylene. When the flamethrower is fired at close range, the product will not discolor, shrink or burn.
Centexbel Belgian Textile Research Center uses high-performance PLA nanofibers to process self-reinforced composite materials; by improving the temperature resistance and durability of PLA, self-sensing fibers, self-cleaning fibers and self-healing fibers are made, increasing its added value.
Textile clothing carefully designed for specific needs is one of the means to achieve ultra-high value for fiber materials, mostly used in sportswear and high-end fashion. For example, engineers from Stanford University in the United States have developed low-cost plastic-based PE textiles that will bring a cool feeling to the human body when worn in summer, and can block sunlight and allow sweat to evaporate quickly. It is composed of a cotton mesh sandwiched between two layers of nano-porous fabrics. The PE fabric with nano-porous fabrics has a higher water evaporation rate than cotton fabrics, allowing sweat to easily evaporate through it. Adidas has developed a smart swimsuit that allows swimmers to reach high speeds. The technology used has three key points: energy optimization (XTRA), whose belt-type material is used to support the swimmer’s activity chain; smart material (X-TRA FLOW) is placed in key positions of the fabric to improve the body’s ability to Positioning in the water; special stroke biometric device (X-TRA FlT), designed for the unique movements of different swimming strokes. Skynfeel Clothing Company has designed special sportswear for long jump athletes. Through a scale-like design, the sweat of the human body can quickly evaporate, and the clothing’s restrictions on the human body can be minimized and the time of flight can be extended.
Newly designed long jump sportswear
High-value product processing technology
With the continuous improvement of knitting machinery processing technology and the development of new high-count and high-quality yarns, the gauges of knitting machines continue to increase. Currently, the gauge of circular knitting machines without sinkers can reach E90, with 3-way yarn feeding per inch. The lower woven fabrics are fine, clear and elastic, and can produce high-quality knitted underwear fabrics; high-speed tricot warp knitting machines have high The gauge number can reach E40, the high speed can reach 4400 r/min, and the output can reach 100.38m/h, which greatly improves production efficiency and product quality; in addition, the double needle bed warp knitting machine can reach E32, and the computerized flat knitting machine The number can reach E21, further promoting the development of knitted fabrics in the direction of lightness and thinness. In the future, technical difficulties such as normal knitting of light knitted fabrics and defects affecting fabric quality will be further solved. Through the knitting process, the knitting machine parts and their yarns will be further solved.Finite element simulation and analysis of tension, design and prediction of weaving tension, research and development of fine control technology for light and thin fabric finishing, promote the development of high-end light and thin knitted fabrics with high count cotton yarn, wool yarn and blended yarn, and realize the multi-functional composite of fabrics , improve the added value of products.
Fine gauge knitting technology and products
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