Air filtration articles

This describes a special filter material for cleaning air. It's made by blending regular cellulose fibers with cellulose ester fibers, which are a modified type of cellulose. This combination allows more air to pass through for a given level of filtration compared to a filter made only from cellulose. The specific version claimed uses cellulose ester fibers with a denier per filament between 1.8 and 3, and is designed for very fine filtration, with pore sizes of 20 microns or less.

Why it matters: The period since 2019 has seen accelerated research and development in air filtration, potentially improving wet-laid processes and cellulose ester fiber production. This could make achieving the claimed performance more practical.

Status: Not in forceListed as no longer active. The specific reason is not in the record we hold.
How hard to build: SpecializedWet-laid process, specific fiber blending, pore size control

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