Polyester waste recycling more and more attention, the use of polyester waste renewable polyester fiber, can reduce costs, reduce oil consumption, improve economic efficiency, the sustainable development of chemical fiber industry is of great significance. Recycled polyester recycled polyester bottles, filament waste, waste fabrics, such as reprocessing is a waste recycling, quality, price uneven, the main application areas for some of the less demanding materials such as cotton fiber Blended materials, fillers and so on. Compared with the primary polyester, the quality of recycled polyester is poor, to regenerate the chemical fiber, for example, the same denier is not as good as the original hand, and the fiber surface defects, uneven thickness, strength and other physical indicators slightly worse. As of 2013, China's regenerated chemical fiber production capacity of 9.76 million tons is expected to be increased to 10.6 million tons in 2014. Despite the rapid growth of China's renewable polyester production capacity, but recycling of waste polyester, the level of technology and lower grades of recycled products. Domestic recycled polyester has a high degree of dependence on imported raw materials (Southeast Asia). As of 2013, China imported 2.19 million tons of waste PET bottles, with an import dependence of 18.39% .Recycled polyester fibers are mainly divided into regenerated cotton staple fibers , Renewable three-dimensional staple and regenerated filament. Among them, renewable cotton staple fiber occupy more than half of production capacity. As of 2013, China's renewable cotton staple fiber production capacity of 5.52 million tons, renewable three-dimensional staple fiber production capacity of 3 million tons, 1.24 million tons of renewable filament production capacity. Eastman company in the United States in the 1980s developed methanol desolventizing polyester technology and successfully mass production; the United States DuPont in the 90s of last century developed a polyester recycling technology, but in general high value-added product development. China's renewable polyester started late, the late 80s of last century began to gradually purchase small production lines from abroad, the main production of low-grade non-woven fabrics, gloves with yarn; 90s of last century, mass production of recycled bottle flake, and can partially replace the original Polyester cotton staple fiber; 2000 after the emergence of a variety of products such as recycled filaments, the replacement of primary polyester products increasing ability. Advantages and Disadvantages of Regenerated Polyester: Firstly, the raw materials of primary polyester, PTA and MEG, both originate from crude oil and the crude oil belongs to non-renewable energy. Therefore, recycled polyester can greatly reduce the heavy dependence on crude oil in light industry and textile. Second, recycled polyesters have significant cost advantages in many applications, such as automotive interior and industrial geotextiles, where virgin polyesters are difficult to use due to their high cost, and recycled polyesters make up for this gap. Thirdly, the current advanced recycled polyester process can well control the secondary pollution discharge, and the recycled polyester directly passes the pollution caused by the PTA and ethylene glycol production processes, so the application value is higher. However, there are still many problems in the utilization of recycled polyester at home and abroad. Recyclable polyester green sustainable development is laudable, but recycled PET bottles in the field of recycling, cleaning the secondary pollution of the environment has not been well resolved. Recycled chemical fiber industry in the recycling of resources, reduce white pollution, but also bring some problems, such as high energy consumption during the production process, raw material cleaning needs a lot of water and generate sewage. Due to the low threshold of recycled polyester industry in our country and the uneven technological level of enterprises, the problems of excessive energy consumption and poor pollution control have become increasingly prominent. There is no corresponding guideline from the enterprise access standards to the control of raw materials. Therefore, the entire recycling Polyester industry urgently needs to improve the access mechanism and production of environmental standards. Recycled polyester industry trends: First, the establishment of efficient, low-cost raw materials recovery system. Relative to developed countries and regions in the abandoned textiles, especially polyester products have been established mature and effective recycling system, our country has not yet started in this regard, especially in the recycling of waste polyester clothing there are many technical difficulties need to be exceeded. More recycling channels are to carry out the basis of textile and garment recycling, but our recovery channels are very limited, and the lack of professional recycling agencies. At present, our country is also trying hard to look forward to establishing a set of suitable models for its own development by means of policy guidance, establishing and perfecting the relevant laws and regulations, drawing on the experience of advanced foreign countries, and so on. Second, polyester bottle recycling has considerable social and economic benefits. At present, recycled polyester bottle flake has been widely used in the production of non-woven fabrics and polyester staple fibers, but the proportion of filaments is still small. With the improvement of regenerated polyester spinning process, regenerated polyester spinning has more room for development. Recycled polyester, polyester downstream demand more independent, each has a mature consumer areas, the alternative is not strong. From the perspective of energy and environmental protection, the space for the development of recycled polyesters is still relatively large, and the replacement capacity of primary polyesters is further enhanced. Meanwhile, with the progress of recycled polyester technology, the number of food-grade recycled bottle flakes will greatly increase. The mass difference between the ester and the primary polyester will be further reduced. China's polyester industry overcapacity is an indisputable fact that this year the price of raw materials, polyester varieties with raw material prices hit a record low, the next period of time the entire industrial chain will remain in the doldrums, the recycled polyester manufacturers have put forward higher requirements : First of all, to keep up with new technologies, real-time improvements in bottle-level polyester raw material recovery process, speed up product structure upgrades, while expanding the application of recycled polyester fiber to make it from the past simple, extensive non-woven areas to take high-end products Forward.
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