Transparent Polyethylene Terephthalate Sheet Manufacturer

Transparent Polyethylene Terephthalate Sheet Manufacturer

Polyethylene terephthalate is the most important type of thermoplastic polyester. The English name is Polyethylene terephthalate, referred to as PET or PEIT (hereinafter referred to as PET), commonly known as polyester resin. The molar molecular weight of the repeating unit is 192g/mol. It is a condensation polymer of terephthalic acid and ethylene glycol. Together with PBT, it is collectively referred to as thermoplastic polyester, or saturated polyester. In 1946, the United Kingdom issued the first patent for preparing PET. In 1949, the British ICI formula completed the pilot test. However, after the United States DuPont purchased the patent, the production facility was established in 1953, the first in the world to realize industrialized production. In the early days, almost all PET was used for synthetic fibers (commonly known as polyester in our country, really good). Since the 1980s, PET has made breakthroughs in the development of engineering plastics. Nucleating agents and crystallization accelerators have been developed one after another. PET and PBT together as thermoplastic polyesters have become one of the five major engineering plastics.
PET is divided into fiber-grade polyester chips and non-fiber-grade polyester chips. ① Fiber-grade polyester is used to make polyester staple fiber and polyester filament, and is the raw material for polyester fiber enterprises to process fibers and related products. Polyester is the most productive variety in chemical fiber. ②Non-fiber grade polyester is also used in bottles, films, etc., which are widely used in the packaging industry, electronic appliances, medical and health, construction, automotive and other fields. Among them, packaging is the largest non-fiber application market for polyester, and it is also the most growing PET Fast field.

Advantages of PET as a packaging material:
1. It has good mechanical properties, impact strength is 3 to 5 times that of other films, and good folding resistance.
2. Resistance to oil, fat, dilute acid, dilute alkali, and most solvents.
3. It has excellent resistance to high and low temperatures. It can be used for a long time in the temperature range of 120°C, and can withstand high temperature of 150°C and low temperature of -70°C in short-term use, and the mechanical properties of high and low temperatures have little effect.
4. The gas and water vapor permeability is low, and it has excellent gas, water, oil and odor resistance.
5. High transparency, can block ultraviolet rays, and good gloss.
6. Non-toxic, tasteless, good hygiene and safety, and can be directly used for food packaging.
 
Characteristics of PET as a packaging material: 
PET is a milky white or light yellow highly crystalline polymer with a smooth and shiny surface. Creep resistance, fatigue resistance, good abrasion resistance and dimensional stability, low abrasion and high hardness, have the greatest toughness among thermoplastics: good electrical insulation, low temperature influence, but poor corona resistance. Non-toxic, weather resistance, good chemical resistance stability, low water absorption, resistance to weak acids and organic solvents, but not immersed in hot water and alkali. PET resin has a high glass transition temperature, slow crystallization speed, long molding cycle, long molding cycle, large molding shrinkage, poor dimensional stability, and crystallization molding is brittle and low heat resistance. Through the improvement of nucleating agent and crystallization agent and glass fiber reinforcement,
In addition to the properties of PBT, PET has the following characteristics:
1. The heat distortion temperature and long-term use temperature are the highest among thermoplastic general engineering plastics;
2. The bending strength is 200MPa, the elastic modulus reaches 4000MPa, the creep and fatigue resistance are also very good, the surface hardness is high, and the mechanical properties are similar to thermoset plastics;
3. Since the ethylene glycol used in the production of PET is almost half the price of the butylene glycol used in the production of PBT, PET resin and reinforced PET are the cheapest among engineering plastics and have a high cost performance.