Most plastics need to be sorted before recycling used plastics by various plastic recycling methods. Due to the complexity and complexity of plastic consumption channels, some post-consumer plastics are difficult to distinguish by simple appearance. Therefore, it is best to indicate the variety of materials on plastic products. China has formulated GB/T16288-1996 “Recycling Mark for Plastic Packaging Products†with reference to the material variety label proposed and implemented by the American Plastics Association (SPE). Although the above marking method can be used to facilitate sorting, there are many unmarked in China. The plastic products bring difficulties to the sorting. In order to separate the different varieties of plastics for classification and recycling, we must first grasp the knowledge of identifying different plastics. The following describes the simple identification method of plastics:
Appearance identification
By observing the appearance of plastics, it is possible to initially identify a large category of plastic products: thermoplastics, thermosets or elastomers. Generally, thermoplastics have both crystalline and amorphous types. The appearance of the crystalline plastic is translucent, opaque or opaque, and it is transparent only in the state of the film, and the hardness is soft to horny. Amorphous is generally colorless, completely transparent when no additives are added, and hardness is harder than horny rubber (additives such as plasticizers are often added at this time). Thermoset plastics usually contain a fill that is impervious to the material and is transparent if it is free of filler. The elastomer has a rubbery feel and a certain stretch ratio.
Heating identification
The heating characteristics of the above three types of plastics are also different, and can be identified by heating. Thermoplastics soften when heated, are easy to melt, and become transparent when melted, often pulling the filaments out of the melt, and are generally susceptible to heat sealing. The thermosetting plastic is heated until the material is chemically decomposed, and the original hardness is not softened, the size is relatively stable, and the carbonization is performed at the decomposition temperature. When the elastomer is heated, no flow occurs until the chemical decomposition temperature, and the material decomposes and carbonizes to the decomposition temperature.
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Label: How to identify two common simple identification methods for common plastics and common plastics
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