Order a Granulation Test
In connection to a purchase of granulation equipment, PowderPro AB offer a Granulation Test of one litre suspension for €995 (shared cost) to help in concepts for slip preparation/formulation and how to operate the equipment in order to achieve high yield and high-quality granules at a low cost.
We do test-granulations, using shared costs, with your powder and binder systems, to evaluate freeze granulation on your materials, please download “Questionnaire for test of freeze granulation”.
- Homogeneous granules (10 to 700 μm) with no migration
- Redispersible nanopowders and enzymes
- No contamination
- High yield and easy to clean
- Evaluate benefits before investing
- Min. volume is normally 50 ml and max. 1000 ml in a test
- Superior for retaining homogeneity in mixed material powders.
Start-up at site
We also offer “start-up at site” for you to save time and money during start-up.
If you don’t find the information you need, please contact us. We’re always glad to help.
Order Granulation Test with LS-2
For a Freeze Granulation Test we apply shared cost (50:50) with our customers. Please fill in the form below, describing your system and we will send you a quotation and additional info. Minimum volume is normally 50 ml and maximum 1000 ml in a test. If we should do the preparation we have to add a certain cost.
In a test-granulation we can run maximum 1 liter suspension. If you think that the suspension survive the transport without being affected you can just send it to our delivery address. An alternative, if not too complicated, is that we prepare the solution in our lab. We prefer to have as high concentration as possible to obtain high granule density, so that the solution results in a fluid form and shear thickening does not occur (dilatant). Do you have any specific preferences regarding the granule size? Please let us know. It will always be a distribution, but we can adapt the spraying parameters to get it finer or coarser. Do you have any other additives in the solution?
Basically we prefer as low water content as possible as this means a higher granule density and less water to be removed in the freeze drying step. Normally, a high solid content is provided by a proper de-agglomeration and stabilization, but it can be limited by finer particle size and corresponding higher specific surface area. High viscosity can be handled just by dilatancy (shear thickening) not appears. From this point of view, the second slurry has a very low powder content, so if the powder is the same as in slurry 1, stabilisation at high pH appears poor. High solids will promote the dry granule strength but as freeze granulation gives week bonding between particles, a binder is normally required to handle the granules without fall apart.
There is no specific limit of the viscosity, just the continuous sheer-thinning of the suspension and no dilatancy. If you prepare suspension it is better to do it with as high solid loading as possible, we can always dilute if necessary. Smaller particles is better, but we can handle particles up to 200-300 microns. If settling will be a serious problem we can add a thickener. Further we need to secure that we have a certain binding capacity within the granules after drying. If not we need to add an additional binder.
At first trial with new composition you do not always get optimum granules, so there is always room for improvement and optimisation. The main costs are (as always) the labour costs.
It will take 30-60 min to prepare the slurry. To set up LS-6, do the spray-freezing, loading and start the dryer and cleaning the equipment is done in 1 hour. The freezing unit LS-6 can freeze 5-8 liters producing 10-12 liters of frozen granules.
The dryer Alpha 1-4 has capacity to dry corresponding to one (1) liter slurry in 24h. It is possible to store frozen granules in a standard freezer for several days and do consecutive drying batches in Alpha 1-4. One liter of slurry consumes 4-5 liters of liquid Nitrogen.
PowderPro help you choose the most suitable equipment, assessing each project on its individual needs and tailor the process and the Freeze Granulator to match your specific requirements.