抄録
In the case of fish body assumed a circular colume (cylindrical body) the calculation of the inside pressure and stress at frozen part of fish body during freezing were carried out on freezing of tuna fish by "-45°C CaCl2 brine immersion system (B1)", "-45°C air blast system (A1)" and "-45°C still air system (A2)".
The results of calculation were made clear that the inside pressure and stress of the frozen part of tuna fish body by "B1" and "A1" showed the same tendency, and the circumferential stress at outside frozen tuna body were larger than inside stress, but the difference of circumferential stress between outside and inside frozen body of "B1" was reached about 30 times by "A1" at ri=0.5, and "A2" showed different tendency from "B1" and "A1", the circumferential stress of outside frozen tuna body was almost smaller than inside stress.
Then, it was in a larger possibility that "-45°C CaCl2, brine immersion system" gives rise to gape on the frozen tuna body during freezing than "-45°C air blast system" and "-45°C still air system".
