| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent fluff from causing between two filter mediums. SOLUTION: When an upper casing 11 and a lower casing 12 each in the shape of an almost rectangular shallow dish forming an inlet port 11a and an outlet port 12a respectively are made to face each other and between flange parts 11b, 12b thereof, the edge parts of a filter medium part 20 are held and vibration-welded, since the filter medium part 20 is formed with an inserted plate 21 being inserted between two filter mediums 22, 23, the filter medium parts 22, 23 do not directly come into contact with each other, and fluff is not caused even when vibration is applied, and damage is reduced.</p> |
