SJ60D two layer blown film machine is specially designed to extrude zip lock bags in different specification at the same time with a high production speed up to15m/min. This integrated blown film line adopts 3-layer co-extrusion technology, employs 9 units of inverter controller system, porcelain heating system, multi-unit air cooling system and etc. This machine can save the floor area, reduce energy-consumption by 30%. Consequently, the production cost can be obviously decreased.