Pleatable nonwoven composite article for gas filter media
AssigneeReemay, Inc.
InventorWilliam F. Murphy, Jr.
Life of this patent
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Abstract
A composite nonwoven fabric suitable for undergoing pleating to form filtration media includes two nonwoven fabric layers which are adhesively bonded. One layer is an air permeable nonwoven web of continuous filaments. A high loft nonwoven batt of staple fibers is laminated to the nonwoven web layer. The nonwoven batt has a gradient fiber density and includes a first layer of relatively low denier fibers and a second layer of relatively higher denier fibers.
Claims17
A composite nonwoven fabric suitable for undergoing pleating to form filtration media, said fabric comprising:
- an air permeable nonwoven web of continuous filaments;
- an air permeable adhesive coating on one surface of said web;
- and
- an air permeable nonwoven batt of staple fibers laminated to said one surface of said nonwoven web by said adhesive coating;
- said nonwoven batt of staple fibers having a fiber denier gradient and comprising a first layer of relatively low denier fibers laminated to said one surface of said nonwoven web by said adhesive, and a second layer of relatively higher denier fibers on the opposite surface of said batt and forming an outer exposed surface of the composite nonwoven fabric.
A composite nonwoven fabric suitable for undergoing pleating to form filtration media, said composite fabric having a basis weight from 2.0 to 6.0 oz/yd.sup.2 and a thickness of from 80-115 mils. and an air permeability of 80-110 cfm/ft.sup.2 min, said fabric comprising
- an air permeable spunbonded nonwoven web of continuous filaments;
- an air permeable resin stiffening coating on one surface of said spunbonded web;
- an air permeable adhesive coating on the opposite surface of said spunbonded web;
- an air permeable nonwoven batt of staple fibers laminated to said spunbonded nonwoven web by said adhesive coating;
- said nonwoven batt of staple fibers having a fiber denier gradient and comprising a first layer of relatively low denier staple fibers and a second layer of relatively higher denier fibers, said second layer of fibers defining the outer exposed surface of the composite nonwoven fabric.
A composite nonwoven fabric suitable for undergoing pleating to form filtration media, said composite fabric having a basis weight from 2.0 to 6.0 oz/yd.sup.2 and a thickness of from 90-115 mils. and an air permeability of 80-110 cfm/ft.sup.2 min, said fabric comprising
- an air permeable isotropic spunbonded nonwoven web formed of randomly deposited bonded continuous polyester filaments;
- an air permeable resin stiffening coating on one surface of said spunbonded web;
- an air permeable adhesive coating on the opposite surface of said spunbonded web;
- and
- an air permeable nonwoven batt of staple fibers laminated to said spunbonded nonwoven web by said adhesive coating;
- said nonwoven batt of staple fibers having a fiber denier gradient and comprising a first layer of staple polyester fibers having a denier per filament of 1.0 to 2.25, said first layer being laminated to said one surface of said spunbonded nonwoven web by said adhesive, and a second layer of staple polyester fibers having a denier per filament of from 4 to 15, said second layer of fibers forming the opposite surface of said batt and defining an outer exposed surface of the composite nonwoven fabric.
Dependencies are inferred from the claim text.