How is an MDO (Machine Direction Orienter) used in the production of breathable films?
Breathability in films utilizing the MDO process is accomplished by uniaxial stretching of a polyolefin film that has been highly loaded with an inert filler such as calcium carbonate (CaCO2). The film surrounding the filler breaks free from the filler creating elongated micropores. This process creates a network of interconnecting pores allowing the transmission of moisture vapor through the film without sacrificing the barrier properties of the film. The type of film is commonly used in the production of diaper backsheets, adult incontinence products, feminine pads, surgical gowns and bandages.
