Filter device
AssigneeDonaldson Company, Inc.
InventorsCynthia D. Bellefeuille, Andrew J. Dallas, M. E. Wright, Michael A. Madden, Suzan K. Nunnink
Life of this patent
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Abstract
A filter device filters contaminants from air for magnetic disk drive systems. The filter has layers of permeable fabric material allowing flow through the filter. An adsorptive slurry is deposited in a discrete pattern onto one layer with a cover layer mounted over the adsorptive deposit. The slurry retains a high adsorptive material surface area for improved adsorption of contaminants. The slurry is placed onto the base material using a screening or other similar application method.
Claims23
A filter for use in a disk drive system, comprising:
- a base layer comprising a multi-layer structure including a support layer, an efficiency membrane covering the support layer, and an adsorptive material holding layer covering the efficiency membrane, wherein the adsorptive material holding layer includes an adsorptive material receiving surface constructed for receiving and holding an adsorptive material;
- an adsorptive layer comprising an adsorptive material deposited by screen printing on the adsorptive material receiving surface of the adsorptive material holding layer in a discrete pattern to form an active-filtering and adsorbing media area, wherein the adsorptive layer does not include a binder or latex for holding the adsorptive material together;
- and
- a cover layer comprising a permeable fabric welded to the adsorptive material holding layer and enclosing the adsorptive material, wherein the filter has a Frazier permeability of at least 0.3 cubic feet per minute per square foot at one-half inch water pressure drop.
A filter for use in a disk drive system, comprising:
- a base layer comprising a multi-layer structure including a support layer, an efficiency membrane covering the support layer, and an adsorptive material holding layer covering the efficiency membrane, wherein the adsorptive material holding layer includes an adsorptive material receiving surface constructed for receiving and holding an adsorptive material;
- an adsorptive layer comprising an adsorptive material deposited by screen printing on the adsorptive material receiving surface of the adsorptive material holding layer in a discrete pattern to form an active-filtering and adsorbing media area, wherein the adsorptive layer does not include a binder or latex for holding the adsorptive material together;
- and
- a cover layer comprising a permeable fabric welded to the adsorptive material holding layer and enclosing the adsorptive material, wherein the filter has a Frazier permeability of at least 0.3 cubic feet per minute per square foot at one-half inch water pressure drop, and wherein the filter being manufactured by a process comprising steps of:
- (a) positioning the base layer proximate a screen member;
- (b) depositing the adsorptive material through the screen member onto the adsorptive material receiving surface of the adsorptive material holding layer;
- (c) applying an adhesive onto the base layer;
- (d) applying the cover layer over the adsorptive material;
- and
- (e) welding the cover layer to the adsorptive material holding layer.
Dependencies are inferred from the claim text.