BOPP is the abbreviation for Biaxially Oriented Polypropylene, which refers to biaxially oriented polypropylene film. Its production is to first make polymer polypropylene melt into sheets or thick films through a narrow machine head, and then stretch them in two vertical directions (longitudinal and transverse) at a certain temperature and a set speed in a special stretching machine by Sumino Seiko. The film is then made by appropriate cooling, heat treatment or special processing (such as corona discharge, coating, etc.).
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