We know that plastic is a plastic processing technology, the main principle is to flatten the plastic hard sheet heating soft, vacuum adsorption on the mold surface, after cooling molding, widely used in plastic packaging, lighting, advertising, decoration and other industries .
Plastic products are processed by plastics. The principle of product formation is to heat flattened plastic hard sheets and soften them, vacuum-absorb them on the surface of the mold, and then cool the molds. The plastic products are widely used in electronics and electrical appliances. Industry, food industry, hardware tools, cosmetics industry, toy industry, daily necessities industry, medicine, health products, automobiles, stationery, cultural and sports goods and other categories of industries.
However, the main plastic material is plastic, plastic is different, plastic products to achieve different effects, what are the main plastic? Mainly PVC, PP, PS, PET. To identify them, it is difficult to distinguish them from the naked eye. It requires a professional identification method to clearly distinguish them and it is not easy to confuse them.
Plastic appearance identification:
By observing the appearance of the plastic, it is possible to initially identify the major categories of plastic products: thermoplastics, thermosets, or elastomers. Typical thermoplastics are crystalline and amorphous. Crystalline plastics appear translucent, opaque, or opaque. They are only transparent in the film state, and their hardness ranges from soft to horny. Amorphous is generally colorless, and is completely transparent when no additives are added, and hardness is harder than that of keratin rubber (additives such as plasticizer are often added at this time). Thermosetting plastics usually contain fillers that are clear and clear, and are transparent when they do not contain fillers. The elastomer has a rubbery feel and has a certain stretch rate.
The heating characteristics of the above three types of plastics are also different and can be identified by heating. Thermoplastics soften when heated, melt easily, and become transparent when melted, often pulling the filaments from the melt, and are often susceptible to heat sealing. The thermosetting plastic is heated until the material is chemically decomposed, and its original hardness is not softened, the size is relatively stable, and the decomposition temperature is charred. When the elastomer is heated, no flow occurs until the chemical decomposition temperature, and the material decomposes and carbonizes to the decomposition temperature.
Density identification method:
Different types of plastics have different densities. Plastics can be identified by measuring density, but at this point the foamed products should be separated because the density of the foamed plastic is not the true density of the material. In the actual industry, there is also the use of different plastic density to sort plastics.
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