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Extrusion die design for slowly reacting materials
Author(s) -
Pan JingPin,
Wu PingYao,
Liu TaJo
Publication year - 1997
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.11728
Subject(s) - die (integrated circuit) , extrusion , materials science , composite material , viscosity , lubrication , extrusion moulding , reactive extrusion , bar (unit) , nanotechnology , physics , meteorology
The flow distribution of slowly reacting polymeric materials inside an extrusion die was analyzed by lubrication theory. The viscosity of the polymeric liquid was assumed to be time‐dependent owing to chemical reaction. Three types of extrusion dies were considered: a T‐die, a linearly tapered coat‐hanger die with a choker bar, and a curvilinearly tapered coat‐hanger die. It was found that the T‐die is not suitable to deliver the polymeric liquid films, whereas the two coat‐hanger dies can deliver the polymeric liquid films with acceptable flow uniformity and residence time distribution.