| 摘要 |
1,031,874. Freeze-drying. SEC N.V. SEFFINGA ENGINEERING CO. Aug. 4, 1964 [Aug. 2, 1963], No. 30912/64. Heading F4G. Freeze-drying apparatus comprises a doublewalled chamber wherein the material to be dried is positioned in layers 2 on plates 9 between radiant panels 1 and the material is first frozen by cold air circulated by a fan 4 through aircooler-condensers 3 and then the ice is sublimated from the material by utilizing panels 1 and connecting the chamber to a vacuum source (not shown), water vapour which is evolved is condensed on the condenser 3 which is cooled by means (not shown). A pressure in the space 8 between the double walls is set up which is equal to or lower than that prevailing in the container during the drying process. Convecvection, radiation or dielectric heating may be utilized. |
