Summary:PE is the synthetic resin with the largest output in the world, and it is also the plastic packaging material with the largest consumption. However, t...
PE is the synthetic resin with the largest output in the world, and it is also the plastic packaging material with the largest consumption. However, the low rigidity of PE plastic bottles has certain limitations in the application of plastic bottle packaging.
PP plastic is isotactic crystal and has good thermal stability, but the material is brittle and easy to break, mainly polypropylene material. The microwave lunch box is made of this material, which is resistant to high temperatures of 130°C and has poor transparency. This is the only plastic box that can be put into the microwave oven and can be reused after careful cleaning.
PVC, also known as PVC, is polyvinyl chloride resin. It is often used to make engineering profiles and daily life plastic products, such as raincoats, building materials, plastic films, and plastic boxes. Excellent plasticity and cheap price. But it can only withstand high temperature of 81 ℃. Plastic products of this material are prone to produce toxic and harmful substances. At present, containers of this material are less used for packaging food. Also, don't let it get heated.
PET not only exhibits excellent tensile properties in the stretch-blow molding of bottles, but also has good performance against the pressure generated by carbonated beverages.
Not only that, the gas barrier property of PET is also much higher than that of PVC, PC, PE and PP, which can effectively prevent the evaporation of water vapor. The plasticizing temperature of PET is 243-270°C. PET also has the advantages of good heat resistance, thermal oxidation resistance, good gloss and optical properties, small specific gravity, low acetaldehyde content and reasonable price.
With the rapid improvement of PET processing technology, its advantages of strong molding plasticity make it occupy the main position of the packaging market.
PET plastic bottles are widely used in blow molding to manufacture hollow containers such as bottles, which can hold beverages such as lemon juice and fruit juice. The PET bottle produced by the injection stretch blow molding method has no seam, the bottle wall is uniform in thickness, and can hold carbonated beverages; the PET bottle produced by the extrusion blow molding method is suitable for holding fruit juice and mineral water.