The development of China's man-made leather and synthetic leather industry has become an emerging industry with considerable potential for development, highlighting the following characteristics: (1) Synthetic leather and synthetic leather are developing rapidly and the market is becoming wider and wider. Today, leather products in daily life are widely available, such as interior decoration, sofa fabrics, car interiors, clothing, footwear and bags, etc. People often think These products are made of natural leather, it is not true, a substantial share of these leather products were leather, synthetic leather occupied. In China, people are accustomed to using PVC resin as raw material for the production of artificial leather called PVC artificial leather (referred to as artificial leather); artificial leather with PU resin as raw material called PU artificial leather (referred to as PU leather); PU resin and non-woven fabric as raw material The production of artificial leather called PU synthetic leather (referred to as synthetic leather). PU artificial leather, PU synthetic leather, the current industry has not yet accurately named, but some people are accustomed to the above three kinds of leather called synthetic leather. In the end how to name? Need to be unified and standardized to give it a more appropriate name. Synthetic leather, synthetic leather is an important part of the plastics industry, is widely used in various sectors of the national economy. Artificial leather, synthetic leather production in the international development of more than 60 years history, China since 1958 to develop and produce artificial leather, which in China's plastics industry is the development of earlier industries. In recent years, the development of China's leather and synthetic leather industry is not only the growth of the equipment production line of production enterprises, but the output of products has been increasing year by year and the variety of colors has been increasing year by year. Moreover, the development of the industry has its own industry organization with considerable cohesion Can China leather, synthetic leather enterprises, including related industry organizations together, developed into a considerable strength of the industry. Following the PVC artificial leather, PU synthetic leather through technical experts for more than 30 years of painstaking research and development, as an ideal alternative to natural leather, access to a breakthrough technological progress. PU coated fabric surface first appeared in the market in the 1950s, and in 1964, the United States DuPont developed a PU synthetic leather for the upper. Japanese companies to establish a production line with an annual output of 600,000 square meters, after 20 years of continuous research and development, PU synthetic leather in terms of product quality, variety, or production have been rapid growth. Its performance closer and closer to the natural leather, and some properties even more than natural leather to achieve the true and false with the degree of natural leather, in the daily life of human occupy a very important position. Today, Japan is the largest producer of synthetic leather. The products of several companies such as Kuraray, Teijin, Toray, and Zhongfang basically represent the level of development of the international community in the 1990s. Its fiber and non-woven fabric are manufactured in the direction of ultrafine, high density and high non-woven. The direction of PU production towards PU dispersion and PU water emulsion is developing. The application fields of products are continuously broadened. From the beginning, Areas of development to clothing, ball games, decoration and other special applications, throughout all aspects of people's daily lives. (2) Synthetic Leather Challenges to Natural Leather Since natural leather is widely used in the production of daily necessities and industrial products due to its excellent natural characteristics, as the world's population increases, the demand for leather in the world has doubled. A limited number of natural Leather has long been unable to meet people's needs. To solve this contradiction, scientists began to research and develop artificial leather and synthetic leather several decades ago to make up for the shortage of natural leather. 50 years of research history is the process of artificial leather, synthetic leather to natural leather challenge. Scientists began to study and analyze the chemical composition and organizational structure of natural leather, starting with nitrocellulose lacquer and entering PVC artificial leather, the first generation of artificial leather. On this basis, scientists made a number of improvements and exploration, the first is the improvement of the substrate, followed by coating resin modification and improvement. By the 1970s, acupuncture into mesh and sticking into mesh and other processes appeared on non-woven fabrics made of synthetic fibers, which made the base material have a lotus root-like cross section and a hollow fiber shape, reached the porous structure, and was in line with the reticular structure of natural leather Requirements; the surface of synthetic leather has been able to do fine pore structure of polyurethane layer, the equivalent of natural leather grain, so that PU synthetic leather appearance and internal structure and the gradual approach to natural leather, and other physical properties are close to the natural leather Indicators, while the color is more vivid than natural leather; its normal temperature folding reached more than 1 million times, low temperature folding can achieve the level of natural leather. The appearance of microfiber PU synthetic leather is the third generation of artificial leather. Its three-dimensional structure of the network of non-woven synthetic leather for the substrate to create a catch up with natural leather conditions. The product combines the newly developed PU slurry impregnated with open-cell structure, composite surface processing technology, played a superfine fiber surface area and a strong water absorption, making ultra-fine PU synthetic leather has a superfine fiber The natural moisture absorption of natural leather, collagen fibers, so regardless of the internal microstructure, or the appearance of the texture and physical properties and people wearing comfort, etc., can be compared with the high-grade natural leather. In addition, microfiber synthetic leather in chemical resistance, quality uniformity, large production and processing adaptability and waterproof, anti-mildew degeneration more than natural leather. Practice has proved that the excellent performance of synthetic leather can not be replaced by natural leather, from domestic and foreign markets to analyze, synthetic leather has also largely replaced the lack of natural resources, leather. The use of artificial leather and synthetic leather bags, clothing, shoes, vehicles and furniture decoration, has been increasingly recognized by the market, its wide range of applications, the large number of varieties, is the traditional natural leather can not be met. Spiral Stairs have a wide range of benefits depending upon your space and style. The small footprint of a spiral stair frame makes it easy to fit into any design, whether you want an open floor plan or square footage is at a premium. We range of spiral stairs for sale feature both wood and metal spiral stairs, making it easy to match your space`s design style.You will need some tools to finish the kit, such as modelling knife, small file, and drill bits. 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