First, the application field of PET
1 and PET are widely used in packaging industry, especially bottled drinks. Through high temperature and high pressure injection molding and secondary expansion molding, beverage bottles of various shapes can be made.
2. In addition, another important field is thermoplastic composite film, which is mainly used for food packaging, such as meat products, dairy products, dried fruits, peanuts and other products.
Second, the advantages and characteristics of pets
1, strong acid and alkali resistance: PET is a material with good acid and alkali resistance, which makes it widely used in packaging fields such as food, medicine and chemical industry.
2. Light weight: PET has low density and light weight, which is convenient for transportation and handling.
3. Recyclable: PET can be recycled and is an environmentally friendly material.
4. High transparency: PET is a highly transparent material, which can perfectly display the shape of products.
Third, the production process of pet products
1.Production of PET particles: PET particles become raw materials for PET products, and the production process can be divided into polymerization and regeneration. Polymerization refers to the polymerization of succinic acid, ethylene glycol and other raw materials under the action of catalyst to obtain PET particles. The regeneration rule is to treat the recycled waste PET bottles to obtain regenerated PET particles.
2. Pre-drying of PET particles: PET particles must be pre-dried to remove moisture and impurities contained in them.
3. Bottle body molding: The bottle body is made of pre-dried PET particles by injection molding. You can also use PET sheet to form in the stamping die, and you can get angular non-circular bottles.
4. Production of bottle mouth: The bottle mouth is also injection molded, generally using hot runner mold or cold runner mold.
5. Filling and sealing: put the made bottle on the filling machine, fill and seal it, and finally pack it with heat shrinkable film.
Four, pet garbage disposal methods
1. recycling: recycling is one of the most effective ways to solve pet garbage. At present, the recycling rate of pet waste in Europe and America is very high, while the recycling of pet waste in China is still in its infancy.
2. Incineration treatment: The pet garbage is incinerated to generate electric energy or heat energy, which can effectively alleviate its environmental pollution.
3. Landfill treatment: the pet garbage will be buried in a closed landfill, which will not pollute the soil and water resources.