China's Fiber Quality Has Reached The International Level In General.

In recent years, our country Spin Industry is developing rapidly, waste silk, waste silk and waste generated in the process of production. cloth And so on. clothing The quickening of the renewal of the industry and the increasing amount of waste textiles eliminated, especially the plastic bottles entering the bottling market and so on, all made the fiber and plastic waste continuously increasing. Synthetic fiber plays an important role in the textile industry, especially in the rapid development of polyester industry. It brings scientific and technological progress and comfortable enjoyment to the production and life of mankind. The environmental pollution caused by various waste polyester products and polyester wastes is also increasing. If these wastes are buried or incinerated, they will have adverse effects on the soil and atmosphere. Therefore, how to turn them into "treasures" has always been a hot topic in the world. Vigorously developing waste recycling has become the key technology of textile and plastics industry's sustainable development.

Recycled polyester fiber production in the world

Experts pointed out that from the perspective of variety, Regenerated fiber It can be divided into two main categories: regenerated cellulose fiber and regenerated chemical fiber. Viscose fiber is the earliest regenerated fiber. After that, new regenerated cellulose fibers, such as Lyocell fiber, cellulose carbamate fiber, superconducting viscose fiber, kapok fiber and bamboo fiber, appeared. Polyester fiber accounts for about 70% of synthetic fiber, and the application of polyester in the bottle making industry is expanding rapidly. Therefore, regenerated chemical fiber is mainly regenerated polyester fiber.

The development of recycled polyester industry in China has been developing for nearly thirty years. In 1987, Jilin textile Technology Development Company introduced the first regenerated fiber production line in China. In 1990s, the single screw spinning equipment mainly transferred from Taiwan and Korea was used to produce low-grade needle punched nonwovens and yarns with foam material. In twenty-first Century, with the development of technology, gradually developing bottle flakes as the main raw materials or foam materials as auxiliary materials to produce regenerated polyester staple fiber, two dimensional hollow fiber, three dimensional crimp hollow fiber, regenerated polyester filament and polyester industrial yarn. Polytron Technologies Inc is currently using polyester bottle material to produce regenerated polyester filament POY, DTY, FDY and polyester industrial yarn.

In recent years Recycled fiber industry The exhibition is fast, mainly concentrated in the southeast coastal area. Jiangsu and Zhejiang accounted for 72% of the total capacity of the country, while 10% of Guangdong and Fujian accounted for 10%, while the rest accounted for only 18%. In 2010, China's regenerated polyester fiber production capacity reached 6 million 200 thousand tons / year, and has become the world's largest producer of recycled polyester fiber.

There are mainly two kinds of production routes for regenerated polyester fiber production: first, recycling materials such as bottle material, polyester waste silk and so on, through direct granulating and granulating, and physical recovery method; two, the reversible performance of polycondensation process of polyester polycondensate is used, and then the polyester is depolymerized by chemical method to form monomers and then condensed into high-quality fiber grade polyester chips for spinning.

Fiber quality has reached international level in general.

Beijing Clothing Institute Wang Rui pointed out that Waste textiles The precise sorting problem is a difficult problem in the industry at present, and is also the focus of research. For different waste textiles, it is necessary to use different methods for effective sorting. For pure spinning products, manual sorting can be done directly. Blended products are designed according to the different composition and blending ratio of blending materials.

In general, if accurate sorting is made, the cost of regenerated fiber will increase a lot, and some even cost more than raw fiber. Therefore, the recovery and utilization of waste textiles can be directly used for low-grade textiles, so that we do not need to distinguish colors. Two, we can broaden the application field of recycled fiber, and our thinking is not confined to the field of textiles only. For example, the use of waste textiles directly processed into ultrashort fibers, and then processed with other materials, made of composite materials, or directly used for filling materials.

So regeneration Polyester fiber What other problems should be solved in the differentiation? Wang Rui believes that the main problem to solve in the current domestic regenerated polyester fiber differentiation is to improve the product mix and improve the proportion of high-end products. Foreign countries started earlier in the differentiation field of recycled polyester fibers, and our work in this area is relatively late. Coupled with technical constraints, our regenerated polyester fibers are mostly concentrated on low-end products. To enter the high-end field, recycled fiber must solve two problems: first, because the fibers in the waste textiles have many colors, so the regenerated fiber should solve the color problem, mainly to study the coloring problem of recycled fiber production, or how to make use of the original color problem. The uniformity of dyeing is a problem faced by the industry when the recycled fiber is dyed. The two is to study how to improve the quality and stability of recycled fiber. The quality uniformity of fibers made from waste textiles is also difficult to guarantee. To solve the two "uniformity" problem, recycled fiber will be able to move towards high-end fields.

Wang Rui finally said that, generally speaking, the research in the field of recycled fibers started earlier in foreign countries, and in recent years, the domestic development is relatively fast. With the increasing emphasis on the field in China and the increasing investment in this field, the overall quality of recycled fiber in China has not been much different from that in other countries. However, the quality and stability of recycled fibers in foreign countries are more excellent, and the equipment is more mature. The gap between China and foreign regenerated fibers is mainly reflected in the equipment.