1. Classified according to the raw materials used for plastic packaging film forming: polyethylene film, polypropylene film, polyvinyl chloride film, and polyester film.
2. Classification according to the use of plastic packaging films: there are agricultural films (here, according to the specific use of agricultural films, they can be divided into mulch films and greenhouse films); packaging films (packaging films can be divided into food packaging films and various types according to their specific uses). Packaging films for industrial products, etc.) and breathable films, water-soluble films and piezoelectric films for special environments and special purposes.
3. Classified according to the forming method of plastic packaging film: there are films extruded and then blow-molded, which are called blown films; films that are extruded and plasticized, and then the molten material is cast from the die opening are called Cast film; a film made by rolling several plasticized materials on a calender is called a calendered film.
