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A three‐dimensional analysis of coextrusion in a single manifold flat die
Author(s) -
Gifford W. A.
Publication year - 2000
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.11341
Subject(s) - die (integrated circuit) , materials science , composite material , polymer , viscosity , distortion (music) , layer (electronics) , flow (mathematics) , manifold (fluid mechanics) , geometry , mechanical engineering , nanotechnology , mathematics , amplifier , optoelectronics , cmos , engineering
The coextrusion of two polymers through a single manifold flat die is examined. The three components of velocity and the pressure are determined in each layer along with the interface between the layers. It is shown that even when the viscosity ratio is one (i.e., single layer), flat “layers” entering the die will not remain flat but will be distorted by the die. For coextrusion of two polymers, the distortion of the interface profile at the exit of the die and thus the uniformity of the layers depends upon the viscosity and flow rate ratios of the two polymers as well as the geometry of the die.