| 摘要 |
<p>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 temperature to 100.degree. - 200.degree. 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 gradually decreased down to 60.degree.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.degree.C. The disclosure also describes a device which comprises a feed hopper, an adjustable feeder to feed the corn from the feed hopper to a horizontal or slightly inclined carrier mechanism, the carrier mechanism being 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 carrier mechanism in the second step being at least insulated and provided with a thermally insulated upper cover.</p> |
