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How to identify plastic film for food bags?

There are many types of plastic films, and their appearance is often very similar. therefore,It is often easy to be confused in the production of composite processes, resulting in differences in product performance.Even production accidents such as scrapping. For technical personnel engaged in the flexible packaging industry, mastering the usualThe method of identification with flexible packaging plastic film is an essential skill. There are many identification methods for plastic films, which can generally be divided into physical methods and chemical methods.two kinds. The former is based on the physical properties of the plastic film (transparency, mechanical strength, brittlenessproperties, heat sealing and heat resistance, etc.) or physical characteristics to identify plastic films; the latter is based onThe chemical properties (flammability and solubility) or chemical characteristics of plastic films are used to distinguish plastic films. This requires familiarity with various commonly used plastic films (LDPE,PP,PS,BOPP, PVC,PVDC,BOPET,PAetc.) main physical and chemical properties. (1)The intuitive method is based on the transparency of the plastic film, and the opaque or translucent LDPE,ordinary PP (BOPPexcept). (2)According to the identification of the low temperature resistance of the film, put the film in the refrigerator for cooling treatment,reduce its temperature to0zhang, observe their brittleness changes, the brittle ones arePP,but BOPPexcept that it needs to be cooled to-20^become brittle. (3)Identification based on special mechanical properties, such as simple impact puncturing of the filmpuncture test to compare their puncture resistance and brittleness, the difficult to puncture isPVDC,BO-PET, PAand LLDPE. (4)According to the high temperature resistance of the film, place the film in the1〇〇 Especially steaming 5min, observe their cooking resistance, and those that are not resistant to cooking areLDPE.

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