The machine is composed of container, screw paddles and transitional parts; the screw paddle are generally made into 1 layer or 3 layers, the outer screw converge is the material to the centre front two sides, and the inner layer of screw conveys the material to the two sides from the centre, so as to form convention mixing. The cubage can be made into rotundity, so the jacket can be played in reaction and drying.