Principle of continuous extrusion degassing of aluminum pipe by split flow

Does the subject want to ask "what is the principle of continuous extrusion degassing of aluminum pipes?" The aluminum tube is divided into a plurality of cells. The principle of continuous extrusion degassing of aluminum pipe by shunt is to divide the aluminum pipe into several chambers, so that the gas can be gradually discharged from the chambers by shunt, which can improve the quality and surface smoothness of the aluminum pipe.