Polyester chips (polyethylene terephthalate) are polymerized from refined terephthalic acid (PTA) and ethylene glycol. The appearance is rice granular, and there are many varieties (all light, half light, large light, cationic, this extinction).
In the market quotation of polyester chips, you often see the words "great light", "semi-extinction" and "light", which are said here for the titanium dioxide (TiO2) content in polyester chips, adding titanium dioxide (TiO2) in the melt is to reduce the luster of the fiber. "Great light" (Yizheng chemical fiber is also called "super light") the content of titanium dioxide in polyester chips is zero; The content of titanium dioxide in the "bright" polyester slice is about 0.1%; The content of titanium dioxide in "semi-dull" polyester chip is (0.32±0.03) %; The titanium dioxide content in the "full extinction" polyester chip is 2.4% to 2.5%.
With the increasing development of the global economy and the increasing improvement of people's living standards, the textile and garment industry has developed rapidly. Semi-dull polyester chip has been widely used for its excellent dyeability, high strength and excellent processing properties, and the application field will be expanded day by day, and become the main raw materials for textile fiber, polyester industrial film, and other fields.
According to the use of the slice can be divided into fiber grade polyester slice, bottle grade polyester slice and film grade polyester slice three categories.
Fiber grade polyester chips are used to manufacture polyester staple fiber and polyester filament, which are raw materials for processing fibers and related products of polyester fiber enterprises. Bottle grade polyester chips are divided into two categories of copolymerization and homopolization, which can be divided into mineral water bottles, carbonated beverage bottles, other food containers and packaging materials according to different uses. Since the advent of polyester film in the 1950s, because of its excellent mechanical properties, chemical resistance and dimensional stability, as an electrical insulation film has been rapidly developed and widely used. With the development of home appliance industry, the use of thick polyester film has increased rapidly. In recent years, polyester film has been widely used in packaging materials, printing materials, building materials, office materials, magnetic materials and photographic materials and other civilian aspects as well as cutting-edge and high-tech fields.
At present, the large polyester manufacturers are one-step production,PTA and MEG polymerization no longer produce slices, but omit the intermediate link directly produce staple fiber and filament. The semi-extinction in the slice accounts for 60%, but the slice spinning has no market, no competitiveness, and the market is transparent. The production of mineral water and other beverage bottles with slices, the current production has been excessive, the quality of the manufacturers is not uniform. One ton of polyester can make more than 33,000 bottles. In addition, the recycled sheet, that is, the waste plastic bottles are recycled to produce staple fiber, low cost, low price, and clean the environment. But smuggling is too serious, worried that once listed futures will disrupt the market order.