| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a filter which can filter a high-density filtered material, prevents generation of coagulation (bridge) of powder material, and prolongs a time before generating differential pressure increase, that is, has a long filtration life.SOLUTION: A filter includes a base material layer, a filter layer, and a skin layer. The base material layer is formed by winding unwoven fabric multiply and thermally compressing. The filter layer is formed by winding a laminate with at least through-air unwoven fabric and a net laminated multiply without thermal compression. The skin layer includes unwoven fabric. Average pore diameter of the unwoven fabric for structuring the base material layer and the skin layer is larger than average pore diameter of the through-air unwoven fabric for structuring the filter layer. The unwoven fabric for structuring the filter layer is the through-air unwoven fabric having average fiber diameter of 0.1-200μ, and the fibers are fused and/or adhered at intersections of the fibers in the unwoven fabric.</p> |
