| 摘要 |
<p>A filter base material comprising many mutually-parallel fluid passages partitioned by porous walls, wherein the fluid passages consist of large-section, large-diameter fluid passages and small-diameter fluid passages each having at least one section size smaller than those of the large-diameter fluid passages, and one end of each of large-diameter fluid passages is sealed, with the small-diameter fluid passages each having at least one section size sealed at ends on the opposite sides of the sealed ends of the large-diameter fluid passages. This filter element is produced by only a step of immersing into a sealant.</p> |
