Method for controlling a freeze drying process
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United States of America Patent
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-
Dec 26, 2000
Grant Date -
N/A
app pub date -
Mar 20, 2000
filing date -
May 7, 1997
priority date (Note) -
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Abstract
In a method for controlling a freeze drying process, a frozen product is arranged on temperature controlled surfaces (12) in an air-evacuated chamber (1) and undergoes a main drying and after-drying phase. During the main drying phase, the temperature of the ice surrounding said product is continuously measured. The pressure in the chamber and/or the temperature of the surfaces are modified during transition from the main drying phase to the after-drying phase. In order to avoid longer idle periods between the chamber (1) and the evacuation device (3, 4, 14) and to determine transition from the main drying phase to the after-drying phase, the pressure and/or the temperature of the surfaces during said transition are modified according to changes int he temperature of the ice.
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