screw and barrel for film blowing machine pp, pe and recycling . it's a good design for film blowing machine, based on 38CrMoAla screw and barrel for film blowing machine. Ruian Yumin machine screw co.,ltd is a factory specialized in making screw barrel, filter, mould and gearbox. These products are main parts of plastic machines and package machines. Founded in 1987, Yumin machine screw factory ...