The die solves problems with deflection caused by the pressure of a molten polymer coming out of the manifold, or the flow channel between the two halves of any flat die. The die is tapered: It is thicker at the center, where the pressure is the greatest from resin coming out of the manifold, and thinner at the ends. The arrangement allows EDI to retain a triangle-shaped “coat hanger” manifold.
EDI said it is possible to correct the deflection problem with the lip-adjustment systems that come standard on flat dies, but those require frequent adjustments when there are many small-run jobs. The problem is more serious in coextrusion, since lip adjusters cannot correct distortions at the interface between layers, the company said.
Tel. 715-726-1201, 715-726-2205, e-mail [email protected]