This unit uses techniques of once-through shape molding, having high efficiency and excellent product quality. Design of machine structure is scientific and reasonable, it can work stably and reliably, easy to operate and maintain. Polyethylene Air-Cushion Film (also called Polyethylene foam film), which is divided into 2 kinds: common polyethylene air cushion film and composite polyethylene air cushion film unit. It is a kind of widely-used packing material. It not only has good ability of vibration-reduction, anti-impact and thermo synthesis, but also has the advantages of good corrosion resistance and good transparency, etc. It has been widely used for household post parcel, precision instrument, bike, polyammoniacum furniture and other packing.