Method and apparatus for freeze drying

Details Method and apparatus for freeze drying Method and apparatus for freeze drying

1988-02-09

1989-02-07

Bennet, Henry A.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 5, 34 92, F28B 504

Patent

active

048022861

ABSTRACT:
In the freeze drying method of the present invention, a predetermined amount of water is poured on the refrigerating/heating surface provided in the drying chamber, which surface is cooled to a temperature below 0.degree. C., so that an ice film is formed on the refrigerating/heating surface. After that, while the thus formed ice film is kept at a temperature below 0.degree. C., a liquid material is supplied to the surface of the ice film so that a frozen layer of the liquid material is formed on the surface of the ice film. Under such circumstances, a vacuum is produced in the drying chamber to conduct the freeze drying operation of the frozen material in a vacuum environment.

REFERENCES:
patent: 3264745 (1966-08-01), Seffinga
patent: 3281956 (1966-11-01), Mason

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