Patent ID: 9488410
Filing Date: 2016-11-08
CPC Classification: F26B

Claim Text:
1. A calculation method for a sublimation interface temperature and a sublimation rate of a material to be dried in a freeze-drying device, in the calculation method for the sublimation interface temperature, a bottom part temperature, and the sublimation rate of the material to be dried in the freeze-drying device comprising: a drying chamber (DC) into which the to-be-dried material is introduced; a cold trap (CT) for condensing and trapping water vapor generated from the to-be-dried material introduced into the drying chamber (DC); a main pipe (a) for providing communication between the drying chamber (DC) and the cold trap (CT); a main valve (MV) for opening and closing the main pipe (a); vacuum adjustment means for adjusting a degree of vacuum in the drying chamber (DC); vacuum detection means for detecting an absolute pressure in the drying chamber (DC) and an absolute pressure in the cold trap (CT); and a control device (CR) for automatically controlling operations of the drying chamber (DC), of the cold trap (CT), and of the opening adjustment means, wherein the control device (CR) stores a required relational expression and a calculation program, drives the vacuum adjustment means during a primary drying period of the to-be-dried material to temporarily change the degree of vacuum (Pdc) in the drying chamber (DC) in an increasing direction, and calculates an average sublimation interface temperature, an average bottom part temperature, and the sublimation rate of the to-be-dried material that prevail during the primary drying period in accordance with the relational expression and with measured data including at least the degree of vacuum (Pdc) in the drying chamber (DC) and the degree of vacuum (Pdt) in the cold trap (CT), which are obtained before and after the temporary change.