Powder Structure Control

of granule structures.

measurement will be combined on an significant set of granules, representing a variation

In the last part of this first period the two aspects of structure description and property

between structural and physical measures is the next step that was performed.

The combination of both kinds of measures to evaluate if there are any significant correlations

between differently structured granules.

The structural as well as the physical parameters provide results that are suitable to distinguish

granules are dispersed in an optical glass cuvette and measured continuously.

measurement of particles size distribution over time in a laser diffraction system. The

beaker test. The second method to measure dissolution behaviour contains the

of granules containing salt within the binder phase can be determined in a standard

Regarding dissolution and disintegration behaviour of the structured granules, the conductivity

positions of granules on a sample container and crushes these granules consecutively.

single granules has to be measured. An experimental set-up was designed that scans

To achieve statistically relevant results for the single particle crushing, a high number of

behaviour by conductivity measurements and online particle sizing respectively.

mechanical strength is measured by single particle crushing and the dissolution or disintegration

For the determination of physical properties three different methods were chosen. The

and covariance function.

were evaluated include volume and surface fraction, star volume, chord length distribution

and used for further calculations of structure descriptors. The structure descriptors that

Three dimensional X-ray micro tomography images of the model granules were recorded

coarse limestone particles was chosen and combined with a polyethylene glycol binder.

to achieve different internal structures. A bimodal particles size distribution of fine and

Model granules were generated containing different size distributions of primary particles

correlation to structure parameters.

this year was about the determination of physical parameters of model granules and their

While the last period of work was focused on the implementation of structure descriptors