Laminated filters
AssigneeAhlstrom Filtration, Inc.
InventorRoger L. Jones
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Abstract
Laminated composite structures for use in making fluid filters are disclosed. Such structures comprise (a) a densified high loft layer of powder bonded nonwoven fabric, rebulkable by heating, laminated to (b) a filter media or element that supplies stiffness to the laminate. Also disclosed are methods of making fluid filters, e.g., ones used to filter inlet air for internal combustion engines, from such laminates, and fluid filters containing such laminates in which the nonwoven layer has been rebulked by heating.
Claims20
A laminated composite structure for use in making fluid filters comprising:
- (a) a densified high loft layer of powder bonded nonwoven fabric, rebulkable by heating, bonded to
- (b) a filter media that supplies stiffness and filtration efficiency to the laminate and to finished fluid filters prepared therefrom.
A laminated composite structure for use in making fluid filters comprising:
- (a) a densified high loft layer of powder bonded nonwoven polyester fabric, rebulkable by heating, comprising crimped polyester staple fibers bonded with a polyester bonding powder, and
- (b) a filter media that supplies stiffness and filtration efficiency to the laminate and to finished fluid filters prepared therefrom, comprising a cellulosic sheet saturated with a polyvinyl acetate resin, the nonwoven fabric being adhesively bonded to the filter media by means of a polyvinyl acetate water based adhesive.
Dependencies are inferred from the claim text.