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US 11,305,224 B2Granted
Air filter media with post-pleat-deposited sorbent particles
Assignee3M Innovative Properties Company
InventorsAndrew R. Fox, Himanshu Jasuja, Mikhail A. Belkin, Bryan L. Gerhardt, Glen O. Gregerson, Gerry A. Hoffdahl, Jonathan M. Lise, Tien T. Wu
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Abstract
An air filter media (10) including a pleated fibrous filtration web (8) with a first major side (2) that includes at least one sorbent-loaded area (26) in which sorbent particles (14) are present on a first major surface (25) of the pleated fibrous filtration web (8), at least some of the sorbent particles (14) being post-pleat-deposited sorbent particles.
Claims12
A method of forming an air filter media, the method comprising:
- folding a fibrous filtration web to form a pleated fibrous filtration web with a first major side comprising a first major surface,
- then,
- depositing adhesive on the first major surface of the pleated fibrous filtration web to form a discontinuous layer of adhesive
- then,
- extruding a plurality of bridging filaments onto the first major side of the pleated fibrous filtration web and extrusion-bonding at least some of the bridging filaments to at least some pleat tips of the first major side of the pleated fibrous filtration web,
- then,
- depositing sorbent particles on the first major surface of the pleated fibrous filtration web so that the sorbent particles are adhesively bonded to the first major surface of the pleated fibrous filtration web by the discontinuous layer of adhesive to form a sorbent-loaded area that occupies at least substantially all of an active filtration area of the pleated fibrous filtration web.
4 more elements
Dependencies are inferred from the claim text.