| 摘要 |
PURPOSE:To prevent the warp of a tray and improve a finished cooking by a method wherein quarter circular portions are formed at four corners of a rectangular bottom surface, a flange is made at an entire circumference of the bottom surface ends and some embossings are formed at an entire bottom surface. CONSTITUTION:Some embossings 15 are arranged at a bottom surface 10, quarter circular portions are formed at four corners and a flange part 12 is formed at an entire circumference of the bottom surface end portions. Due to these embossings 15, the material at the bottom surface 10 may extend to show a gradual curved shape, resulting in that a relative pulling action between the flange 10 and the bottom surface 10 caused by a difference in thermal expansion of the flange 12 and the bottom surface 10 generated in case of putting a food 1 on the tray 3 and heating it in the oven may be accommodated by the curved portions. Therefore, it is possible to prevent a warp of the tray. Also in the case that a cold food is placed on the preheated tray 3, a relative pulling between the flange 12 and the bottom surface 10 caused by a difference in thermal expansion may also be accommodated to prevent a warp of the tray. With this arrangement, it is possible to get a uniform and better finishing of the food. |
