Filter media with a multi-layer structure
AssigneeHollingsworth & Vose Company
InventorsJohn A. Wertz, Douglas M. Guimond
Life of this patent
Estimating the term…
Abstract
Filter media are described. The filter media may include multiple layers. In some embodiments, the filter media include a nanofiber layer adhered to another layer. In some embodiments, the layer to which the nanofiber layer is adhered is formed of multiple fiber types (e.g., fibers that give rise to structures having different air permeabilities and/or pressure drops). In some embodiments, the nanofiber layer is adhered to a single-phase or a multi-phase layer. In some embodiments, the nanofiber layer is manufactured from a meltblown process. The filter media may be designed to have advantageous properties including, in some cases, a high dust particle capture efficiency and/or a high dust holding capacity.
Claims22
A filter media comprising:
- a first layer comprising:
- a first phase including a first plurality of fibers and a second plurality of fibers different from the first plurality of fibers;
- a second phase including a third plurality of fibers and a fourth plurality of fibers different from the third plurality of fibers, the third plurality of fibers being the same as or different from the first or second plurality of fibers and the fourth plurality of fibers being the same as or different from the first or second plurality of fibers, wherein the air permeability of the first plurality of fibers is greater than the air permeability of the second plurality of fibers, wherein the air permeability of the third plurality of fibers is greater than the air permeability of the fourth plurality of fibers, wherein the first or third pluralities of fibers are made from an organic polymeric material;
- and
- a transition phase between the first and second phases, wherein the transition phase comprises at least a portion of the first plurality of fibers, at least a portion of the second plurality of fibers, at least a portion of the third plurality of fibers, and at least a portion of the fourth plurality of fibers, and wherein at least a portion of the first plurality of fibers, at least a portion of the second plurality of fibers, at least a portion of the third plurality of fibers, and at least a portion of the fourth plurality of fibers are intermingled with each other, and wherein the transition phase is formed by a wet laid process,
- wherein a weight ratio of the first plurality of fibers to the second plurality of fibers in the article is from 50:50 to 97:3,
- wherein the first, second, third and fourth pluralities of fibers are wet laid;
- and
- a second layer attached to the first layer, wherein the second layer is a nanofiber layer, and wherein the first layer has a higher air permeability than the nanofiber layer.
Dependencies are inferred from the claim text.