| 摘要 |
PROBLEM TO BE SOLVED: To provide a cover of an aqueous liquid treatment tank which is lightweight, inexpensive, excellent in durability, and recyclable, and its covering structure. SOLUTION: The cover 21 covering the top opening part 12 of the aqueous liquid treatment tank 11 is composed of a top covering part 22 and a side covering part 52. These covering parts 22, 52 freely form a cover of a top region 16 with a plurality of support members 23, a plurality of locking members 28 each fixed at the important point of the support member 23, and a cover member 35 made of a fluorine film spread and fixed through the support members 28. When the aqueous liquid in the aqueous liquid treatment tank 11 is strongly corrosive, the cover member 35 is spread and fixed to the inner surfaces of the support members 23, that is, the sides facing the aqueous liquid, and when external environment is also corrosive, the cover member 35 is spread and fixed to both inner and outer surfaces of the support members 23, thereby the support members can be protected. A part or whole of the cover member 35 can be rolled up through an opening and closing mechanism 39 to form a large opening part 45. COPYRIGHT: (C)2003,JPO
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