Rules to determine the clearance of die cavity, the length of flat portion of flow passage, and the way of supplying material to the inner ribs are formulated to guide the design of extrusion die.

• 为了保证挤出模设计的准确性，提出了口模内筋间隙的设计原则、内筋流道成型段长度的设计原则以及内筋供料方式的智能选择。