Drying and gas or vapor contact with solids – Material treated by electromagnetic energy – Radio or high-frequency energy
Patent
1997-10-10
1999-09-14
Bennett, Henry
Drying and gas or vapor contact with solids
Material treated by electromagnetic energy
Radio or high-frequency energy
34363, 34367, 34502, 34535, 34545, 34546, 34 68, 219701, 219705, F26B 334
Patent
active
059503254
ABSTRACT:
The present invention provides a method and apparatus for agitation-free, low temperature drying of fragile, temperature sensitive, granular materials at atmospheric pressure using Radio Frequency (RF) energy to provide the heat of evaporation. A relatively low velocity flow of purge air through either a continuously moving or stationary product bed provides means for removing moisture from the product at atmospheric pressure. The purge air is maintained at a controlled humidity, temperature and velocity, and the intensity of the RF field is controlled in response to temperature sensing means to control the temperature of the product. For the case of a continuously moving product bed the RF applicator is preferably divided into multiple zones, which may be independently controlled, to effect control of the moisture and temperature profile of the product as it passes through the apparatus. The total air flow is kept to the minimum necessary to remove the moisture, which minimizes agitation of the product, minimizes fracturing of the granules and maximizes first pass yield.
REFERENCES:
patent: 2783345 (1957-02-01), Warren
patent: 3528179 (1970-09-01), Smith
patent: 3532848 (1970-10-01), Loring, Jr. et al.
patent: 4038052 (1977-07-01), Melcher et al.
patent: 4208806 (1980-06-01), Manser et al.
patent: 4468865 (1984-09-01), Inagaki
patent: 4879444 (1989-11-01), Bichot et al.
patent: 5024004 (1991-06-01), Jaeger
patent: 5341576 (1994-08-01), Tsutomu et al.
patent: 5378319 (1995-01-01), Tran et al.
Freeman, III Roy Quinn
Geigle William Lawrence
Mehdizadeh Mehrdad
Williams, Jr. Earl
Bennett Henry
E. I. Du Pont de Nemours and Company
Gravini Steve
LandOfFree
Method and apparatus for low temperature continuous drying of te does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for low temperature continuous drying of te, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for low temperature continuous drying of te will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1497480