A model aqueous injection moulding paste was investigated by capillary
theology. The experimental work consisted of 26 pressure measurements
on each of three capillaries to provide an extended shear rate range
from 0.5 to 150 s(-1). A power law model was found to be adequate for
general prediction of the flow curve. However, slip flow had to be tak
en into account to map the shape of the flow curve more accurately. Th
e Hatzikiriakos method, which does not require the use of different di
ameter capillaries, was applied to measure slip flow and gave rational
solutions. The flow curve was modelled using rheological parameters f
or shear how and slip flow over the region of the flow curve for which
they were valid. The adjusted model incorporating slip flow gave a be
tter correlation with the experimental results. (C) 1998 Elsevier Scie
nce S.A. All rights reserved.