PRODUCTION METHOD FOR MULTILAYER FILTER MATERIAL AND MULTILAYER FILTER MATERIAL

The object of the invention is a method for producing a multi-layer filtering material (14), and a multi-layer filtering material (14). By using this method, at least one filtering layer (15) of natural fibres, such as wood pulp fibres and/or plastic fibres and binder material and/or binder fibres i...

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Bibliographische Detailangaben
Hauptverfasser:	LINDBLAD, KAJ, SORVARI, JUHA
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	BRAIDING COTTON-WOOL FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS 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 TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS TEXTILES TRANSPORTING TRIMMINGS WADDING
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Beschreibung
Zusammenfassung:	The object of the invention is a method for producing a multi-layer filtering material (14), and a multi-layer filtering material (14). By using this method, at least one filtering layer (15) of natural fibres, such as wood pulp fibres and/or plastic fibres and binder material and/or binder fibres is formed by the dry forming technique and bonded by heat. According to the invention, the method further comprises the stages wherein at least one strengthening layer (16, 17) of natural fibres, such as wood pulp fibres and/or plastic fibres and binder material and/or binder fibres is formed by the dry forming technique, said strengthening layer being formed so as to be in contact with said at least one filtering layer (15) and being formed in connection with the forming of the filtering layer, said at least one strengthening layer being bonded with said at least one filtering layer in order to form a unity (14), said unity being formed in connection with the heat bonding of the filtering layer. On décrit un procédé de production d'une matière (14) filtrante multicouche et une matière (14) filtrante multicouche ainsi produite. Le procédé consiste à former au moyen d'une technique de formage à sec, au moins une couche filtrante (15) formée de fibres naturelles, telles que des fibres de pâte de bois et/ou des fibres plastiques associée à une matière de liant et/ou des fibres de liant qui est ensuite liée thermiquement. Le procédé selon l'invention comprend également d'autres étapes dans lesquelles on forme au moyen d'une technique de formage à sec au moins une couche (16, 17) de renforcement constituée de fibres naturelles, telles que des fibres de pâte à bois et/ou des fibres plastiques associées à une matière de liant et/ou des fibres de liant ; ladite ou lesdites couches de renforcement étant formée(s) de manière à se trouver en contact avec au moins une couche filtrante (15) et étant formée(s) en connexion à la formation de la couche filtrante puis soudée(s) à la ou aux couches filtrantes pour former une structure unitaire (14) qui est elle même formée en connexion à la liaison thermique de la couche filtrante.