In the market, there are many kinds of plastics, but people who make plastics generally only know that they are divided into engineering plastics and daily-use plastics. In essence, plastics are divided into crystalline plastics and amorphous plastics.
Crystalline plastics: nylon, propylene, ethylene, polyoxymethylene, etc.;
Non-crystalline plastic: Polycarbon, ABS, benzene, vinyl chloride and so on.
Why do you say it is divided into the above two categories? Due to different molecular structure.
(1) The surface of the crystalline plastic is slippery. It cannot be painted or chrome plated. It is difficult to decorate the surface. Such as packaging bags spraying, printing, coloring, generally adopts high-current electronic cone hair, in order to print color, but it can not be durable, and the adhesive is more difficult to find.
(2) Non-crystalline plastic surface can absorb other molecules, such as: ink, chrome plating, spraying, etc. So the general product shell, case, TV shell, etc. are using non-crystalline plastic, easy to decorate, not easy to fall off.
However, the above two types of plastics must not be mixed together. If they are mixed together, they will be scrapped, and the surface will produce blisters, water lines, and severe peeling. Therefore, the two types of plastics should be mixed, otherwise the consequences are great. In terms of waste plastics, it is necessary to identify which kind of material should be selected separately before use, but there is no major impact on the mix of similar plastics, such as propylene and ethylene.
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