Plastic is synthetic or natural macromolecular resin as the main material. After you have added all kinds of additives, at a certain temperature and pressure is malleable, cooling can be fixed after the shape of the material. Natural or synthetic polymer molecules in the molten state and additive molecular process called uniform distribution around plastic, have reached this process have plastic, have not reached, is considered not plastic. Plastic packaging is one of the four material in the packaging industry: paper and cardboard, 30%, plastic, 25%, metal 25%, glass 15%.
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