This blown film machine is designed to produce breathable and non-breathable film in a different way from casting breathable film machine. The resin is extruded from the extruder into a tube-shaped bubble through a circular die and an air-ring, and the tube-shaped bubble is flattened through haul-off unit and the flattened film is stretched by MDO unit to produce breathable film. The layer of the film can be composed of Mono or Multi layer film according to customer’s specification. With this film’s superior waterproof and ventilation functions, it is used as a material for disposable hygienic products like sanitary towel, sanitary napkin, diaper film, surgical barrier gown, waterproof material, anti dew film and etc.