| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a filter in which the reduction of efficiency in oil mist load is suppressed, high efficiency is maintained even when loosing electric charge, and the rise of air-flow resistance is suppressed. <P>SOLUTION: The filter is constituted by laminating an electret fiber layer having oil repellency, and a sheet containing a porous material such as an activated charcoal or an oil absorbable layer being a fiber sheet comprising olefine base fiber or polyester base fiber. <P>COPYRIGHT: (C)2013,JPO&INPIT |
