| 摘要 |
PROBLEM TO BE SOLVED: To uniformize thawing by reducing a temperature unevenness when heated. SOLUTION: In the case of irradiating a material 2 to be thawed with a microwave from a microwave generating means 3, a chilled gas is circulated from a chilled gas generating means 9 to a thawing chamber 1 to cool the material and to sufficiently thaw the material into its interior, while preventing a deterioration of a quality of the material due to an overheat of its surface part. Then, a temperature difference between the material 2 and the circulating chilled gas is calculated by a chilled temperature calculating means 15. The circulating gas temperature is controlled based on the calculated result so that the difference becomes a constant value. Thus, even when thawing of the material is advanced so that its temperature rises, disturbance of the thawing of its interior due to excessive cooling of the surface part is prevented, and uniform thawing without temperature unevenness can be realized.
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