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Melt tearing and ovality in wire coating
Author(s) -
Hade Aaron J.,
Giacomin A. Jeffrey
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.11318
Subject(s) - ovality , tearing , materials science , isothermal process , coating , composite material , newtonian fluid , stress (linguistics) , cone (formal languages) , mechanics , structural engineering , mathematics , thermodynamics , physics , engineering , linguistics , philosophy , algorithm
We investigate how to avoid tearing, egg‐shaped cross sections or foldover of the polymer melt cone in tube coating of wire. We use an isothermal Newtonian model for the melt cone. We calculate the melt stress and the draw ratio balance, the parameter used in industry to avoid process problems. The stress calculations help us explain ovality and tearing. To help practitioners apply the results we provide examples.