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Development of an extrusion rheometer suitable for on‐line rheological measurements
Author(s) -
Springer Paul W.,
Brodkey Robert S.,
Lynn R. Emerson
Publication year - 1975
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.760150804
Subject(s) - rheometer , materials science , extrusion , plastics extrusion , rheology , composite material , pressure sensor , slit , flow (mathematics) , mechanics , shear rate , mechanical engineering , optics , engineering , physics
A new type of extrusion rheometer has been designed which employs dual slit geometry with a double valve. The double valve concept allows a change in flow rates through the slits, while the total extruder flow rate remains constant thus leaving extruder operating conditions unchanged. Electronic pressure transducers are mounted along the slit to record axial pressure distribution. Flow rates are measured by weighing polymer output and wall shear stresses are calculated from the axial pressure profiles. Exit pressures are derived from extrapolating the pressure profile to the slit exit and from this information the normal stresses can be determined.