Example: Product optimization with flow agent
An important quantity, which is measured with the Ring Shear Tester,
is the flowability, ffc. The flowability is a measure for
the effort required to initiate flow. The larger the flowability,
the better a powder flows. To find out the effect of a flow aid
additive on the flowability, mixtures of the powder with different
flow aid concentrations have been prepared and then tested with a
diagram the flowability, ffc, of the product is plotted
vs. the concentration of the flow agent (nano-powder). The red graph
represents the instantaneous properties, while the blue graph shows
the properties after 22 hours storage at rest (e.g., storage of the
product in a silo or a container).
It is clearly visible that the flowability is smaller after 22 hours
storage. This indicates that the product exhibits a pronounced time
consolidation effect. Time consolidation is also known as "caking".
The flowability shows a maximum at a flow aid concentration of
0.55%, i.e., this flow aid concentration results in the best
flowability. An increase of the flow aid concentration beyond 0.55%
has a negative effect on the flowability.
Further application examples
- Quality control: Ensuring a product with good dosing behavior
by limitation of the range of flowability.
- Quality control: Ensuring a product which has a sufficient
flowability even after storage at rest over a long period of
- Investigation of the influence of the particle size
distribution on the flow behavior.
- Investigation of the influence of the storage temperature on
the time consolidation effect (caking).
- Optimization of production processes regarding good
flowability of the products..
- Optimization of the powder composition for homogeneous filling
of the dies of a tablet press.
Publications on the application of Ring Shear
The use of Ring Shear Tester measurements for various
applications is described in a number of publications. Some of
these publications can be found in this list:
Areas of application, Distribution partners
Examples of industries in which our ring shear testers are used,
for bulk materials that are tested with our ring shear testers,
and countries in which our ring shear testers are used, and our
distribution partners can be found here:
Areas of application,
International Round Robin test on Ring Shear
Some years ago, an international Round Robin test took place on
our ring shear testers (small tester RST-XS; large tester
RST-01.pc), in which many of our customers in Europe and the USA