NONWOVEN FABRIC FOR PLEATED FILTER AND PROCESS FOR PREPARING THE SAME

• Main Authors: IWASAKI, KAORI, HORIGUCHI, HIROYOSHI, NISHIMURA, MAKOTO
• Format: Patent
• Language: English; French; German
• Published: 14.04.2004
• Edition: 7
• Subjects: BRAIDING; COTTON-WOOL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR; KNITTING; LACE-MAKING; LAUNDERING; 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; TREATMENT OF TEXTILES OR THE LIKE; TRIMMINGS; WADDING; WALL, FLOOR OR LIKE COVERING MATERIALS, e.g. LINOLEUM,OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF AFIBROUS WEB COATED WITH A LAYER OF MACROMOLECULARMATERIAL

An embodiment of the present invention is a nonwoven fabric for pleated filters comprising a sheath-core conjugate filament in which the core component is made of a polymer higher in melting point and the sheath component is made of a polymer lower in melting point, wherein the surfaces of the nonwoven fabric have a plurality of compressively bonded portions dotted by embossing, and the weight per unit area X (g/m ) of the nonwoven fabric and the stiffness Y (mgf) obtained according to the Gurley method of JIS L 1096 satisfy the following formulae: Another embodiment of the present invention is a filter element which uses said nonwoven fabric for pleated filters as a filter medium. The nonwoven fabric for pleated filters of the present invention can be produced by sucking and drawing continuous filaments spun from a sheath-core conjugate spinneret, opening them, stacking them on a travelling net, to form a continuous filament web, preliminarily compressively bonding the web by a pair of heated flat rolls, and then partially thermally compressively bonding it by a pair of embossing rolls. The present invention can provide an excellent high performance nonwoven fabric for pleated filters free from delamination, moderate in stiffness, and good in pleatability and dimensional stability.