抄録
Keiko Nagao Noriko Kita Rika Amano Mayumi Morita Midori Kasai Keiko Hatae“Covered food cooking” is a parcel cooking method in which meat or fish is usually covered with Japanese paper or salt. We evaluated wheat flour dough, pie dough, mashed potato, misogama (miso and flour) and shiogama (salt and egg white) for food parcel wrapping in this study. The thermal diffusivity (α) of each sample was calculated from measurements of the thermal conductivity (λ), heat capacity (c) and density (ρ). The internal temperature along one axis was measured during heating, and the heat retardation time was calculated. The various materials used for covered food cooking were then studied for their properties.
Shiogama had the highest thermal conductivity, being followed by mashed potato, wheat flour dough, misogama and pie dough in that order. The retardation time τ(χ), an index of heating rate, tended to follow the order of thermal conductivity for the covering materials. A high correlation was seen between 1/τ(χ) and thermal diffusivity(α).
The retardation time in cooling made shiogama easy to heat and easy to cool, so it could not retain the heating effect. Misogama, wheat flour dough and pie dough retained the heating effect much better than shiogama.
