| 摘要 |
PROBLEM TO BE SOLVED: To provide a filter which can suppress clogging while enhancing filtration accuracy.SOLUTION: A filter 10 is provided with a cake filter protection layer 34 formed between a filter layer 32, and a filter layer 36 of which an average pore diameter is smaller than that of the filter layer 32 on a downstream side of the filter layer 32. The cake filter protection layer 34 has an average pore diameter larger than the average pore diameter of the filter layer 32, and thus large particles K1 passing through the filter layer 32 and fine particles K2 smaller than the particles K1 are deposited on a surface 36A of the filter layer 36 and a cake filter layer 50 is formed. The cake filter protection layer 34 is structured of fiber material which is not likely to break as compared with at least the filter layer 36 on the downstream side out of the filter layer 32 and the filter layer 36 with respect to a compression load generated in a flow channel. Therefore, the cake filter layer 50 is trodden by the compression load generated by a fluid pressure and the filtering layer 32 by the cake filter protection layer 34, and accelerated facilitation of clogging can be suppressed. |
