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The effect of shear on fusion and mechanical properties of rigid PVC pipes
Author(s) -
Bystedt Jan,
Flensjö Martin,
Svensson Gunnar,
Terselius Björn
Publication year - 1988
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.730100211
Subject(s) - extrusion , materials science , shear (geology) , composite material , capillary action , viscometer , viscosity
The shear level was increased during twin screw extrusion of PVC at different melt temperatures by inserting a hole plate in front of the screw tips. The variation of shear level did not significantly affect the capillary pressure in capillary viscometry at 135°C. However, the falling weight impact strength was markedly influenced. In internal water pressure tests at 60°C premature failure was obtained for pipes extruded at 198°C at the highest shear level.