Our company employs the technology of multi-layer compound materials for production of flexible packaging bag, multi-layer compound polystyrene bag, special shape bag, vacuum packing bag, liquid packing bag, paper-plastic bag for holding salt, aluminum foil bag, food packing bag used for steaming and boiling with high temperature, which can be applied to the food packing in the fields of supermarket freezing, refreshing, dry fruit and conditioning treatment and so on.