Granulation of powder mixtures in the Lab
Powderpro provides equipments for freeze granulation, highly suitable for small scale processing of high-quality granules owing to the simplicity and easy cleaning set-up. By using the lab-scale freeze granulator, LS-2, during four hours (one afternoon), it is possible to granulate ten small batches of different compositions, including cleaning time, with high yield, without contamination and with the same granule size as achieved in large-scale granulation! In general, the mean granule size can be varied from about 20 to 500 micron with spherical shape, can easily be re-dispersed owing to the weak inter-granular bonding and be post-processed with potent performance owing to the high degree of homogeneity.
Freeze granulation realizes “Homogeneous granulation” – homogeneous distribution of powder particles, binder or other compound mixtures for improved performance of the final products. Save time and money in lab-granulation by the quick, non-contamination and easy to clean ability, and last but not least, with excellent granule properties!
Freeze granulation improves the granule properties vs conventional granulation methods such as spray drying producing granules with no void formation, no migration of fine particles or binders and no formation of hard dry shell.
For the spraying in liquid Nitrogen we use air atomization nozzle. Normal size distribution is approximately 10-700 um. This can be adjusted to finer, maybe below 400 um.
To get fine granules we need higher air pressure resulting in higher loss of material blowing out of freezing chamber. The only way to get more narrow sizes is by sieving after drying. Therefore, it is also difficult to answer to your first question. Normally, we get out about 90% of the input as granules, but then including the entire size range. So before deciding any trials you should be aware of these conditions, and according to the agreement with Swerea IVF, these trials has to be done in the frame of the institute.
Further, you can send dry powder mixes and we prepare suspensions but we just need to agree upon necessary additives, basically dispersant and binder. Finally, we do not have any comparable data regarding FG vs SP. Materials are to be sent to the visting address.