ABSTRACT
This chapter presents design formulas that can be used to construct tapered choker bars so that trial-and-error approaches can be eliminated and an extrusion die should be much more flexible to handle different production requirements. Owing to the complex geometry of extrusion dies, it is impractical to design dies based purely on trial-and-error approaches; mathematical modeling is usually required. Extrusion dies are necessary for the production of wide polymer and metal films or sheets and are also required to generate thin liquid layers for many coating operations. A liquid enters the interior of the die through the inlet tube; after filling the manifold, the liquid will move forward through the slot section and form a wide and thin liquid layer.
