The so-called puffing, also known as the organization or structure, is about to clean up the broken material by the spiral of the advance, the density continues to increase, the material continues to increase, the material gap in the gas was introduced, when the gap gas is filled with material By the role of shear and produce reflux, so that the pressure inside the chamber increased. With the friction between the screw and the machine to make the material of the crystal to achieve full mixing, heating, pressure, glue, gelatinization and organizational changes.