Controlled nucleation during freezing step of freeze drying cycle using pressure differential ice fog distribution
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United States of America Patent
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Sep 23, 2014
Grant Date -
Nov 1, 2012
app pub date -
Apr 29, 2011
filing date -
Apr 29, 2011
priority date (Note) -
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Abstract
A method of controlling and enhancing the nucleation of product in a freeze dryer, wherein the product is maintained at a predetermined temperature and pressure in a chamber of the freeze dryer, and a predetermined volume of ice fog is created in a condenser chamber separate from the product chamber and connected thereto by a vapor port. The ice fog has a predetermined pressure that is greater than that of the product chamber, and is rapidly conveyed through the vapor port into the product chamber for even distribution therein to create uniform and rapid nucleation of the product in different areas of the product chamber.
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