| 摘要 |
PROBLEM TO BE SOLVED: To provide a cartridge filter apparatus which has high filtering efficiency and long filter life span and which is manufactured inexpensively. SOLUTION: In the cartridge filter apparatus having a pleated filter medium, a core, sleeves and two end caps (up and down cover part), the filter medium section which is orthogonal to the pleat is provided with a mountain fold line part, which does not reach the sleeves, at the core side and is provided with a valley fold line part, which is more proximal to the core side than the mountain fold line part, at the sleeve side. Thus, the buckling of the filter medium is prevented when the mountain fold line part and the valley fold line part are mutually overlapped via the pleat. COPYRIGHT: (C)2007,JPO&INPIT
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