Premium
Velocity profile of rigid PVC in an extrusion die
Author(s) -
Brown Randy J.
Publication year - 1982
Publication title -
journal of vinyl technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 0193-7197
DOI - 10.1002/vnl.730040302
Subject(s) - materials science , die (integrated circuit) , slippage , extrusion , power law , crystallinity , composite material , statistics , mathematics , nanotechnology
A method to determine the velocity profile of a melt within the die for both opaque and transparent materials shows that, above the crystalline melt temperature, the velocity profile of PVC follows the power‐law relationship. Below the crystalline melt temperature, the velocity of PVC is flatter and more like plug flow than is predicted by the power‐law relationship because the high elastic modulus (due to crystallinity) leads to slippage at the wall or melt fracture. Knowledge of the expected velocity profile can be used to design dies to compensate for higher velocity in the center.