Product category:
Boilers, Heat Exchangers, Dryers and Refrigeration
News Release from: Hosokawa Micron | Subject: Stirred freeze drying
Edited by the Processingtalk Editorial
Team on 10 January 2008
New freeze drying technology for
nanomaterials
Hosokawa Micron stirred freeze drying technology has been successful with materials in the nano size range (down to 50 nm), where agglomerate-free powder from a suspension is required
Wet milled materials on nano-scale, such as aluminium hydroxide, titanium oxide, calcium carbonate and PTFE have been successfully milled whilst trials are currently taking place on food products including watercress, carrots and mushrooms Conventional freeze drying systems of the tray type are typically slow, with a low heat transfer rate due to stationary material and are manually intensive as trays of material have to be filled and discharged by hand
This article was originally published on Processingtalk on 9 Feb 2006 at 8.00am (UK)
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Another disadvantage is that the product layer forms a single piece of hard baked material, which has to be crushed after the freeze-drying stage and this step can damage some products.
The new Hosokawa Micron stirred freeze drying technology does not suffer from the above problems as it is based on the use of a stirred, jacketed Vrieco Nauta conical vacuum dryer operated at low temperatures and pressure.
As the material is in constant motion stirred freeze drying offers increased heat transfer rates, which shortens the drying time.
The final freezing stage is simplified because it can be done in the same vessel instead of having to transfer the product to a separate freezing unit making the process much less manually intensive compared to the conventional tray drying process.
This new stirred freeze drying technology can be used for even the most sensitive and precious products with a single step solid to gas stage which removes the liquid without changing the product structure.
Ideal for applications in pro-biotics, food, pharmaceuticals and nano-materials where the demand for pristine undamaged final product is paramount.
This new technology can be operated continuously if required where the dry particles released from the frozen material during the drying process are collected in a filter alongside the actual dryer.
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