| 摘要 |
PROBLEM TO BE SOLVED: To provide a tray rack board having a reinforced part easily cleaned and preventing propagation of saprophyte. SOLUTION: This plastic rack board 12 for the tray rack 10 having the width and the length capable of mounting a tray is provided with, at least, a tubular reinforcing part 32 extending in the length direction and regulating a sealed space 34. It is preferable that the reinforcing part regulates each side part 22 of the rack board.
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