FILTER

The present invention provides a filter that hinders particulate bridging and delays the onset of differential pressure increases, and consequently has a long service life. Provided is a filter having a substrate layer, a filtration layer, and an outer skin layer, wherein the substrate layer is cons...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	HIGUCHI, Yozo, TOKUDOME, Shinichi, KANARI, Kazuki, ENDO, Daisuke
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BRAIDING COTTON-WOOL FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS KNITTING LACE-MAKING LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARYMATERIAL NON-WOVEN FABRICS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION TEXTILES TRANSPORTING TRIMMINGS WADDING
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Beschreibung
Zusammenfassung:	The present invention provides a filter that hinders particulate bridging and delays the onset of differential pressure increases, and consequently has a long service life. Provided is a filter having a substrate layer, a filtration layer, and an outer skin layer, wherein the substrate layer is constituted by winding a nonwoven fabric to create multiple layers and thermally bonding said nonwoven fabric; the filtration layer is constituted by multiply winding but not thermally bonding a laminate, which is formed by laminating at least an air-permeable nonwoven fabric and a netting; the outer skin layer includes a nonwoven fabric; and the average pore diameter of the nonwoven fabric that makes up the substrate layer and the outer skin layer is larger than the average pore diameter of the air-permeable nonwoven fabric that makes up the filtration layer.