COMPOSITE FILTER MEDIUM AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a composite filter medium for an air filter which can realize a volume reduction upon incineration. SOLUTION: This composite filter medium has a two-layer structure of an upstream-side filter medium layer and a downstream-side filter medium layer. Both the upstream-side filter medium layer and the downstream-side filter medium layer contain heat-fusible fibers having a melting point of 50 to 170°C as measured by differential scanning calorimetry (DSC). At least the downstream-side filter medium layer contains heat-fusible fibers and microglass fibers having an average fiber diameter of 0.1 to 1μm. The heat-fusible fibers are heat-fused to the microglass fibers. Alternatively, the heat-fusible fibers are partly heat-fused to each other. COPYRIGHT: (C)2007,JPO&INPIT