Bubble film unit using one-time molding process, high production efficiency, product quality. The machine structure design is scientific and reasonable, the operation is balanced and reliable, and the operation and maintenance are convenient. Polyethylene gas cushion membrane (also known as polyethylene bubble film) which is divided into ordinary polyethylene air cushion film and composite polyethylene air cushion film unit, is currently widely used as a packaging material, not only has good shock absorption, impact resistance, heat resistance; There corrosion, good transparency, etc., are widely used in home postal parcels, precision instruments, bicycles, polyurethane furniture and other packaging