PRODUCTION METHOD OF ELECTRET FILTER MEDIUM

PROBLEM TO BE SOLVED: To provide a production method of an electret filter medium of a porous dielectric sheet which is highly and sufficiently turned into an electret to its interior. SOLUTION: An aqueous solution containing at least one organic or inorganic compound having an index (pKa) of acid d...

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Bibliographische Detailangaben
Hauptverfasser:	MASUMORI TADAO, TOKUDA SEIJI
Format:	Patent
Sprache:	eng
Schlagworte:	BRAIDING COTTON-WOOL FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR KNITTING LACE-MAKING LAUNDERING MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLIDMATERIALS OR FLUIDS MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROMSOLID MATERIALS OR FLUIDS MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARYMATERIAL NON-WOVEN FABRICS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATICTABLES OR JIGS TEXTILES TRANSPORTING TREATMENT OF TEXTILES OR THE LIKE TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS,FABRICS, FEATHERS, OR FIBROUS GOODS MADE FROM SUCH MATERIALS TRIMMINGS WADDING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a production method of an electret filter medium of a porous dielectric sheet which is highly and sufficiently turned into an electret to its interior. SOLUTION: An aqueous solution containing at least one organic or inorganic compound having an index (pKa) of acid dissociation of not less than 3.0 is jetted to the porous dielectric sheet with a pressure sufficient for the solution to pass through the sheet so as to turn the sheet into the electret to its interior sufficiently, and then the sheet is dried to produce the electret filter medium. COPYRIGHT: (C)2004,JPO