What Is The Polypropylene Film?
What is the Polypropylene Film?
The polypropylene film is produced by first forming the polymer polypropylene melt into a sheet or a thick film through a narrow head, and then at a certain temperature and a set speed in a dedicated stretching machine, simultaneously or separately. The film is stretched in two perpendicular directions (longitudinal, transverse) and subjected to appropriate cooling or heat treatment or special processing ,such as corona, coating, etc.. Commonly used polypropylene films include: conventional biaxially oriented polypropylene films, heat-sealed biaxially oriented polypropylene films, cigarette packaging films, biaxially oriented polypropylene pearl films, biaxially oriented polypropylene metallized films, matt films, etc. .
Polypropylene film is a very important soft packaging material. Polypropylene film is colorless, odorless, odorless, non-toxic, and has high tensile strength, impact strength, rigidity, toughness and good transparency. The surface energy of polypropylene film is low, corona treatment is required before gluing or printing. After corona treatment, the polypropylene film has good printing adaptability, it can be color-printed to obtain a beautiful appearance, and is therefore often used as a surface layer material of a composite film.