Microwave and far infrared drying under reduced pressure

Details Microwave and far infrared drying under reduced pressure Microwave and far infrared drying under reduced pressure

1997-02-04

1999-01-12

Leung, Philip H.

Electric heating

Microwave heating

With control system

219680, 219686, 219709, 219751, 34263, 34259, H05B 668, H05B 680

Patent

active

058594124

ABSTRACT:
A method of drying objects includes the steps of placing the object into a pressure reduction tank, placing a metallic element having an acute-angled portion into the pressure reduction tank, reducing to the pressure toward a predetermined single reduced pressure value or plurality of reduced pressure values, subjecting the object to controlled microwave heating and controlled far infrared heating either separately or simultaneously, continuously heating the body of the pressure reduction tank to vaporize any water that comes into contact with the inside wall surfaces of the pressure reduction tank, detecting an electrical discharge at the acute-angled portion of the metallic element due to microwave energy, stopping or pausing the microwave heating when an electrical discharge is detected at the acute-angled portion of the metallic element, continuously measuring the change in reduced pressure at prescribed time intervals after the microwave heating has been stopped or paused upon detecting an electrical discharge due to microwave energy, and terminating the drying process when the measured change in reduced pressure reaches a predetermined target reduced pressure change value determined in accordance with the level of dryness selected and the type of object being dried.

REFERENCES:
patent: 2859534 (1958-11-01), Copson
patent: 4622446 (1986-11-01), Sugisawa et al.
patent: 4856201 (1989-08-01), Dokoupil et al.
patent: 5003143 (1991-03-01), Marks et al.
patent: 5135122 (1992-08-01), Gross et al.
patent: 5270509 (1993-12-01), Gerling
patent: 5325600 (1994-07-01), Gentile
patent: 5606804 (1997-03-01), Smith et al.

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