The best dispersion results are obtained when the geometry of the dispersion container, the diameter, the peripheral velocity and the height of the dissolver disc above the bottom of the vessel as well as rheological millbase properties are matched to one another.
After adding pigments and fillers to resin solution, the millbase is brought into a laminar rolling flow pattern by increasing the speed of the shaft until no standing material can be seen at the wall of the container. At the correct speed, a channel begins to form around the shaft and a part of the dissolver disc becomes visible. At this point, the millbase will form a doughnut-like flow pattern. The doughnut-like pattern flow pattern is a signal that the maximum mechanical power possible is being transferred into the millbase.
Innovative dispersion and fine grinding systems for laboratory and pilot plant: VMA-GETZMAN offers a whole range of innovative systems for dispersion and fine grinding. From laboratory to pilot plants. Meeting all your needs as for example explosion proof, high viscosity and vacuum conditions. All with VMA:s well reputed technology, functional design as well as the high quality.
We offer analytical solutions for Dispersions, Particles and Coatings, which includes: (1) Characterization of the formulation in original concentration to investigate the separation behaviour; (2) Droplet size distribution, Particle size distribution, Density distribution, Particle properties and interactions and (3) Determination of adhesive and bonding strength for coatings and different composite materials. This product line is manufactured by LUM with headquarters in Berlin.
The direct and accelerated stability analysis of emulsions and suspensions as well as the comprehensive characterization of particles properties can be performed by means of space- and time-resolved extinction profiles (STEP Technology) determination over the entire sample length. All information on creaming, sedimentation, flocculation, coalescence or phase separation processes are represented by the progression of the transmission profiles as a function of time. Based on these space- and time-resolved extinction profles demixing kinetics such as clarification velocity, sedimentation and flotation velocity of particles, residual turbidity, separated phase volume (liquid/liquid, liquid/solid …), sediment consolidation or dewaterability and particle size distributions are measured.
One example on this product line is: LUMiSizer , the All-in-One Dispersion Analyzer. This high-end dispersion analyzer is a complete dispersion lab, all in one instrument. The Analytical Centrifuge has been developed to speed up and accurately predict the stability and rheological behavior of nano- and microscale dispersions and simultaneously calculate the particle size distribution.
The Adhesion properties of adhesive bonded joints, coated samples, and other bonded interfaces are performed using Centrifugal Adhesion Testing Technology (CAT) on fracture analyzer LUMiFrac (winner of the Berlin-Brandenburg 2012 innovation award). In addition to measuring pull-off forces under various stresses and temperature conditions, also shear strength can be determined. The applied stress profile can be varied by the user, as can other operational parameters like for example absolute final load, the rate of load increase, length of measuring time, and temperature.
Read more: http://www.lum-gmbh.de