According to their own properties, plastics packaging can be divided into two categories: thermoplastics that can be melt-molded repeatedly and can basically maintain their characteristics and thermosets that can only be melt-molded once. According to its use, it can be divided into general plastics with wide application range, low price and good comprehensive performance, such as PE, PP, PVC, PS, and amino plastics with good physical and mechanical strength, and may be used in engineering machinery instead of metal. Engineering plastics such as: ABS, nylon, polyester, POM, TPX-1, etc. And a class of engineering plastics with particularly excellent performance, such as special plastics with particularly good radiation resistance and high temperature resistance, such as polyarylsulfone, liquid crystal polymer, etc. According to the molecular crystal size of thermoplastic resins, thermoplastics can be divided into amorphous polymers and crystalline polymers.
Main features
The main characteristics of plastic are:
First, the density is small, the specific strength is high, and a higher packaging yield can be obtained, that is, the “package volume or packaging area per unit mass.”
Second, most plastics have good chemical resistance, good acid resistance, alkali resistance, resistance to various organic solvents, long-term storage, and no oxidation.
Third, the molding is easy, and the required molding energy consumption is lower than that of metal materials such as steel.
Fourth, it has good transparency and easy coloring.
Fifth, it has good strength, high strength per unit weight, impact resistance and easy modification.
Sixth, the processing cost is low.
Seventh, excellent insulation.