Direct comparison between rotational and extrusion rheometers

Abstract

The use of cone and plate rotational rheology to characterize the flow properties of concentrated dispersion and extrusion methods to determine the rheological properties of pastes have become established rheometric techniques. Direct comparison between the results obtained from the two techniques has not previously been demonstrated. In this article the results of such a comparison using established experimental methods and associated analysis are reported. It is found that for most samples investigated the difference in the calculated values of shear stress at a shear rate of 5/s is ≤10%. Data for a series of slurries, composed of various solid fractions of lime waste, are reported over a shear rate of 0-10/s. The computed results for two techniques are shown to be, within the experimental error, identical over this shear rate range.

Material jetting for advanced applications: A state-of-the-art review, gaps and future directions

“…In order to observe any shear rate dependent properties of the ink, shear rates close to the ones in a piezo inkjet printhead, that is 10 5 s -1 [66] or even 10 6 s -1 [34], should be considered as well. Higher shear viscosity measurements can be performed on a capillary rheometer [67], microfluidic sensor-based viscometer [68] or a multi-pass rheometer [69]. The latter one enables shear rates up to 160,000 s -1 and therefore allows measurement at shear rates similar to inkjet printing [69].…”