Gradient Nanofiber Filter Media

摘要

Composite filter media is formed from multiple layers of media material including a nanofiber media layer, where the layers are laminated, bound, or otherwise composited to each other. The composite filter media can comprise at least one nanofiber layer comprising polymeric media material having a geometric mean fiber diameter of about 100 nm to 1 μm, and fibers configured in a gradient such that ratio of the geometric mean diameter of fibers at the upstream face of the nanofiber layer to the geometric mean diameter of fibers at the downstream face of the nanofiber layer is about 1.1 to 2.8, preferably about 1.2 to 2.4.

主权项

1. A composite filter media comprising multiple layers of media material, wherein: the composite filter media comprises at least one nanofiber layer that comprises polymeric media material having a geometric mean fiber diameter of less than 1 μm; and the nanofiber layer comprises fibers configured in a gradient such that ratio of the geometric mean diameter of fibers at the upstream face of the nanofiber layer to the geometric mean diameter of fibers at the downstream face of the nanofiber layer is between 1.2 and 2.8.