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Article: Simulation of slit dies in operation including the interaction between melt pressure and die deflection.
- Article from:
- Polymer Engineering and Science
- Article date:
- August 15, 1996
- Author:
CopyrightCOPYRIGHT 1996 Society of Plastics Engineers, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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INTRODUCTION
The primary requirement in the process design of slit extrusion dies is to ensure uniform melt distribution across the width of the die, leading to an extrudate of a sufficiently uniform thickness. Several analytic theories have been proposed for the design of distribution manifolds to achieve this, and numerical methods have also been used to simulate flow in the manifold and slit. Unfortunately, the design performance is often not achieved because of process dependent alterations of the slit dimensions. Extrusion pressures, acting over the large area of the slit, exert forces high enough to bring about significant deflection of the die body, opening up ...
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