Air filter fleece with surprising stiffness and progressive density variation through its considerable depth, is formed in single stage by liquid-jetting, before adhesive- or cohesive- bonding of its fibers

• Main Authors: STAUDENMAYER, OLIVER, BERKEMANN, RALPH, HOLLINGSWORTH, ANTHONY
• Format: Patent
• Language: English; German
• Published: 06.04.2000
• Edition: 7
• Subjects: BRAIDING; COTTON-WOOL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS; KNITTING; LACE-MAKING; 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

Fibers are intertwined by liquid-jetting from the clean-air side (8) before bonding. Compression caused, increases from the dirty-air side (7). Regions of differing density (A, B, C) are formed, where particles of differing sizes are separated, during use. Preferred Features: Fiber titer is 0.05-50 dtex. Fibers (6) are coarse and fine, the titers differing by a factor of 6 or more. The fine fibers comprise split fibers, produced by liquid-jetting. Median density of the fleece increases progressively in the flow direction (R). Of layers forming the construction, one or more is prefabricated; another is a pile applied to it and bonded by liquid-jetting. The pile is on the clean air side and includes split fibers. The side facing the dirty air has the greater proportion of coarse fibers. The fibers are electrostatically-charged. Fiber cohesion is a result of welding or adhesion using a binder. The filter material is liquid-jetted over its entire cross section. The finished material is pleated. Luftfilter mit einem Tiefenfiltermaterial (2), das einen eine Rohluftseite (7) und eine Reinluftseite (8) aufweisenden Vliesstoff (5) enthält, wobei der Vliesstoff (5) aus adhäsiv und/oder kohäsiv verbundenen Fasern (6) gebildet ist, wobei die Fasern (6) Verschlingungen aufweisen, die vor dem adhäsiven und/oder kohäsiven Verbinden durch Flüssigkeitsstrahlen von der Reinluftseite (8) her erzeugt sind und wobei durch das Flüssigkeitsstrahlen die Fasern (6) von der Rohluftseite (7) zur Reinluftseite (8) hin zunehmend derart verdichtet sind, daß unterschiedlich verdichtete Bereiche (A, B, C) gebildet sind, in denen Teilchen unterschiedlicher Größe abscheidbar sind.