| 摘要 |
A filter element (30) which has a filtering medium (31) formed by ruffling a fiber sheet and a resin frame (32) surrounding the perimeter of the filtering medium (31); and a filtering medium (31) which comprises a fiber sheet comprising a heat-resistant fiber having a melting temperature or a carbonization temperature of 300� C. or higher. As the heat-resistant fiber, use can be made of a meta-type or para-type wholly aromatic polyamide fiber, a wholly aromatic polyester fiber, a polyphenylene sulfide fiber, or a polyamideimide fiber. As a fiber constituting the fiber sheet except the heat-resistant fiber, use can be made of a fiber having a softening point of 150� C. or higher such as a polyamide based fiber, a polyester based fiber, an acrylic fiber, or a vinylon fiber. Preferably, the heat-resistant fiber accounts for 3 mass % or more of the fiber sheet The filtering medium is suppressed in the reduction of bursting strength during use and causes no substantial problems in practical use. |
