Method and device for a two-step heat treatment of corn

H - Electricity – 05 – B

Patent

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327/2.41

H05B 6/64 (2006.01) F24C 7/02 (2006.01)

Patent

CA 1092659

ABSTRACT OF THE DISCLOSURE The disclosure describes a method for a two-step heat treatment of corn with electromagnetic oscillation in the range of micro-waves or infra-red radiation. This is done by heating corn in a first step during 5 - 120 seconds from ambient temp- erature to 100° - 200° C with infra-red rays or electromagnetic waves having a wave length of 0.7 - 0.1 m. In a second step the corn is kept for 5 - 200 seconds at the temperature reached during the first step or at a temperature not more than 10% higher than the last named temperature and/or the temperature is gradu- ally decreased down to 60°C at the most. During the first step the temperature is controlled by setting up the intensity of infra-red rays or electromagnetic waves to the wave length 0.7 - 0.1 m and the temperature remains unchanged during the second step. Finally, there is crushing or flaking of the corn when hot which is then cooled down below 40°C. The disclosure also describes a device which comprises a feed hopper, an adjust- able feeder to feed the corn from the feed hopper to a horizontal or slightly inclined carrier mechanism, the carrier mechanism be- ing followed by a crusher, then a cooler. The carrier mechanism comprises a belt or vibratory conveyer and means for adjusting the carrier speed of the carrier, infra-red radiators adapted to irradiate a first step constituting 20% - 90% of the length of the carrier mechanism, electric resistor heating means to heat the remaining second step constituting 80% - 10% of the length of said carrier mechanism, the lower portion and sides of at least part of the carrier mechanism being thermally insulated, the car- rier mechanism in the second step being at least insulated and provided with a thermally insulated upper cover.

277072

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