High temperature treated media
AssigneeDonaldson Company, Inc.
InventorsDaniel Little, Robert M. Rogers, Derek O. Jones, Keh B. Dema
Life of this patent
Estimating the term…
Abstract
A thermally bonded filtration media that can be used in high temperature conditions in the absence of any loss of fiber through thermal effects or mechanical impact on the fiber components is disclosed. The filter media can be manufactured and used in a filter unit or structure, can be placed in a stream of removable fluid, and can remove a particulate load from the mobile stream at an increased temperature range. The combination of bi-component fiber, other filter media fiber, and other filtration additives provides an improved filtration media having unique properties in high temperature, high performance applications.
Claims19
A filter media comprising fibers in a thermally bonded nonwoven web comprising a mixture of:
- 30 wt-% to 80 wt-% of bi-component fibers comprising a core with a structural polymer portion and shell with a thermoplastic binder polymer portion, wherein the structural polymer portion has a melting point of at least 240° C. and the binder polymer portion has a melting point of up to 180° C., wherein the bi-component fibers comprise 5 wt-% to 25 wt-% of a first bi-component fiber comprising a first shell polymer with a first melting point and 25 wt-% to 60 wt-% of a second bi-component fiber comprising a second shell polymer with a second melting point that is higher than the first melting point, and wherein the bi-component fibers have a diameter of about 5 to 25 μm;
- and
- 20 wt-% to 70 wt-% of staple fibers comprising polymeric monocomponent fibers and one or both of cellulosic fibers and cotton linter fibers,
- wherein the nonwoven web has a solidity of 10% or less.
A filter comprising a plurality of layers, at least one of the layers comprising a thermally bonded nonwoven web comprising a mixture of:
- 30 wt-% to 80 wt-% of bi-component fibers comprising a core with a structural polymer portion and shell with a thermoplastic binder polymer portion, wherein the bi-component fibers comprise 5 wt-% to 25 wt-% of a first bi-component fiber comprising a first shell polymer with a first melting point and 25 wt-% to 60 wt-% of a second bi-component fiber comprising a second shell polymer with a second melting point that is higher than the first melting point, and wherein the structural polymer portion has a melting point of at least 240° C. and the binder polymer portion has a melting point of up to 180° C., wherein the bi-component fibers have a diameter of about 5 to 25 μm;
- and
- 20 wt-% to 70 wt-% of staple fibers comprising polymeric monocomponent fibers and one or both of cellulosic fibers and cotton linter fibers,
- wherein the nonwoven web has a solidity of 10% or less.
Dependencies are inferred from the claim text.