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An integrated analysis for a coextrusion process
Author(s) -
Chiou JongYee,
Wu PingYao,
Tsai ChinChin,
Liu TaJo
Publication year - 1998
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.10164
Subject(s) - materials science , die (integrated circuit) , composite number , finite element method , inlet , flow (mathematics) , manifold (fluid mechanics) , bar (unit) , mechanical engineering , process (computing) , composite material , mechanics , engineering drawing , computer science , structural engineering , engineering , physics , nanotechnology , meteorology , operating system
An integrated numerical approach is proposed to simulate the polymeric liquid flow in a bicomponent coextrusion die with a feedblock inlet system. The three‐dimensional finite element method is applied to determine the fluid motion and the interfacial position of the two polymeric liquids before entering the die body, whereas the two‐dimensional Hele‐Shaw model is assumed to be applicable for fluid flow in the manifold and the slot section of the die body. An optimal design procedure is incorporated into the simulation and the dimensions of the manifold can be properly selected such that the die can deliver the composite liquid film with acceptable uniformity. A specially designed choker bar can also be inserted to reduce the flow non‐uniformities caused by production variations. The contraction of the composite liquid film emanating from the die exit is also predicted under different draw ratios.