Global Patent Index - EP 0980503 A1

EP 0980503 A1 2000-02-23 - METHOD FOR CONTROLLING A FREEZE DRYING PROCESS

Title (en)

METHOD FOR CONTROLLING A FREEZE DRYING PROCESS

Title (de)

VERFAHREN ZUR STEUERUNG EINES GEFRIERTROCKNUNGSPROZESSES

Title (fr)

PROCEDE DE COMMANDE D'UN PROCESSUS DE LYOPHILISATION

Publication

EP 0980503 A1 (DE)

Application

EP 98922751 A

Priority

  • DE 19719398 A
  • EP 9802335 W

Abstract (en)

[origin: DE19719398A1] The invention relates to a method for controlling a freeze drying process, wherein a frozen product is arranged on temperable surfaces 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 invention provides that the pressure and/or the temperature of the surfaces characterizing said transition should be modified according to changes in the temperature of the ice.

IPC 1-7 (main, further and additional classification)

F26B 5/06

IPC 8 full level (invention and additional information)

A23L 3/44 (2006.01); F26B 5/06 (2006.01)

CPC (invention and additional information)

F26B 5/06 (2013.01)

Citation (search report)

See references of WO 9850744A1

Designated contracting state (EPC)

BE CH DE DK ES FR GB IT LI NL SE

DOCDB simple family

DE 19719398 A1 19981112; DK 0980503 T3 20011022; EP 0980503 A1 20000223; EP 0980503 B1 20010711; ES 2161532 T3 20011201; JP 2001525049 A 20011204; US 6163979 A 20001226; WO 9850744 A1 19981112