The term ‘biaxially oriented’ means that the film is stretched in two diverse directions. This alignment brings about several changes in the film, such as lower elongation (harder to stretch), higher tensile strength for a given thickness, greater stiffness, improved optical properties, and improved barrier to water/gases. When barrier and sealing properties are required, they can be obtained by using either of the two methods, namely coating the film or co-extruding layers of different materials. Biaxially oriented polypropylene (BOPP) film is a polypropylene film, which is extensively used for packaging. Biaxial orientation is a process that includes heating of a cast film to bring it to a stretchable temperature. These films are stretched in a machine in the diagonal direction, which is carried out through two methods such as tenter method and bubble method. Biaxially oriented polypropylene (BOPP) films can resist UV light, and it also possesses ingrained properties such as ...
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