PURPOSE: To improve a collecting efficiency and a durability of a filter body together, by using a filter medium consisting of laminated plural layers of filtrating materials made of nonwoven clothes etc. having different densities of fiber aggregations.
CONSTITUTION: A filter body F is formed with a filtrating material A having a density of coarsely aggregated fibers, a material B having a density of densely one and a material C having an intermediate density, all of which are arranged as A, B, C in sequence from the outside to the center of the body. Air to be filtrated enters from the outside of the body F i.e. from the outer surface of the filtrating material A having a coarse density, and is sucked from a hole D1 of the most inside material C having a dense density, to be discharged.
DOI YASUFUMI
KADOWAKI MASAHIRO
YOKOTA TADASHI
| JPS5316980U | 1978-02-13 | |||
| JPS52139679A | 1977-11-21 | |||
| JPS54128871A | 1979-10-05 | |||
| JPS4618535Y1 | 1971-06-28 |
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