Air-cleaner filter material for internal combustion engine and air-cleaner element
US7594946B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 4, 2006 |
| Grant date | Sep 29, 2009 |
| Priority date | — |
| Expiry date | Dec 2, 2027 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2279/60
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention provides an air-cleaner filter material for an internal combustion engine, which comprises a dust-collecting layer comprising a melt-blown nonwoven fabric having a maximum pore size of 100 μm or less and a dust-retaining layer arranged upstream of the dust-collecting layer and laminated integrally by heat fusion with, the dust-collecting layer, comprising a thermal-bond nonwoven fabric having fibers with two or more fiber diameters arranged in the order of increasing the proportion of smaller fiber diameter in the direction from the upstream to downstream side, wherein the in-plane of the filter material has a portion of high fiber density and a portion of low fiber density, and the portion of high fiber density occurs in a lattice pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.