The development of composite film materials inner layer film, from LDPE, LLDPE, CPP, MLLDPE, development to the current co-extruded film in large quantities, the basic realization of packaging functionalization, personalization, to meet the packaging contents preservation, processing performance, transportation, storage conditions. With the continuous introduction of new materials, the rise of the inner film production technology and equipment, composite film packaging materials inner film will certainly be developed by leaps and bounds, and promote food.

       With the progress of society, people's needs continue to grow, a variety of functional and environmental protection of composite films continue to appear. For example, aluminum foil laminate film, which is a very common laminate roll film, usually contains pure aluminum (AL) and aluminum plating (VMPET). It has good mechanical strength, light weight, no thermal adhesion, metallic luster, good shading, good reflection of light, not easy to be corroded, good barrier, moisture-proof and waterproof, good air tightness, and has fragrance retention.