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POWDER TECHNOLOGY
401/97
Electrostatic powder deposition on substrates. Using new technology for electrically generating dry powder aerosols, it was demonstrated that it is possible to deposit the suspended dust on various substrates, such as paper, plastics, glass, metal screens, etc., in thin layers which show strong adhesion to the substrate. This is particularly so for micronised powders with particle diameters < 5 micron. Since particles carry an electric charge on emerging from the aerosol device, this causes strong initial contact with the substrate due to electrical image forces. From there on, Van de Waals forces take over resulting in unusually strong bonding of the powder to the substrate without the need to apply a glue. We also found,that using micronised dust, it is possible to deposit quantities in the order of micrograms per sq.cm, in an apparently uniform finely devided manner - as the electrically charged particles are repelled from each other which tends to prevent their clumping and agglomeration. Apart from early interest shown by the pharmaceutical industry for accurately dosing minute quantities of drugs, we think there may be applications in various other industries. We are seeking parties interested in jointly exploring such prospects.
Contact Dr. S.G. Szirmai by email: [email protected]
402/97
Particle size reduction by a new technique. A technique was discovered for drasticly reducing particle size of many powders to near- micron size and below. As this involves ultrasonic energy treatment of the gas-entrained dust, the break-up of particles is entirely free of contaminants. The process appears energy efficient and is clearly suitable for scale-up to continuous industrial scale production. Funding is urgently required for a limited 'proof of concept' study.
Contact Dr. S.G. Szirmai by email: [email protected]
403/97
Fluidization with baffles. A new process has been devised for the dry separation of particles on basis of small differences in size and/or density. Horizontal screen-like baffles, with an aperture size considerably larger than the particles, are introduced in a bubbling fluidized bed. This leads to the suppression of the mixing processes, while axial particle seggregation is maintained. The result is an increased tendency for particle seggregation within the fluidized bed. This technique can be used in both the continuous and batch fluidized beds. Examples of applications: fluidized coating and granulation, fluidized drying, fluidized catalyst regeneration.
Inventors: G.P.Hartholt, Ir R. la Riviere, Dr. A.C. Hoffmann, Prof. Dr. Ir L.P.B.M. Janssen. International patents pending. Licensing opportunities. For further information contact Alex Hoffmann [email protected]
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