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Shear and extensional flow of reinforced plastics in injection molding. II. Effects of die angle and bore diameter on entry pressure with bulk molding compound
Author(s) -
Gibson A. G.,
Williamson G. A.
Publication year - 1985
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.760251511
Subject(s) - materials science , body orifice , molding (decorative) , extensional definition , composite material , die (integrated circuit) , extensional viscosity , shear (geology) , flow (mathematics) , mechanics , rheology , mechanical engineering , shear viscosity , paleontology , physics , biology , engineering , tectonics , nanotechnology
Orifice flow measurements have been performed at high strain rates on bulk molding compound (BMC) using convergent dies. A range of die angles and bore diameters was examined. Two models for flow behavior have been compared. It appears that, with BMC, there is a transition from constrained convergence to convergence with recirculation at a die semiangle of approximately 56 degrees.