High mechanical strength, heat sealing performance, heat sealing temperature, barrier resistance, opening resistance, pollution resistance, and other comprehensive properties, while reducing its processing cost, have been widely used.

The grassroots mainly plays a role in aesthetics, printing, and moisture resistance; The functional layer mainly plays a role in blocking and avoiding light; The heat sealing layer is in direct contact with the packaging material, providing adaptability, permeability resistance, good heat sealing performance, as well as transparency, opening, and other functions.