LOW ELONGATION STRUCTURES FOR HOT GAS FILTRATION

• Main Authors: ALBERTONE YANNICK, WYSS KURT HANS
• Format: Patent
• Language: English
• Published: 06.12.2012
• Subjects: 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 US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TEXTILES; TRANSPORTING; TRIMMINGS; WADDING

Structures containing a fiber mat inserted into a high modulus scrim of minimum basis weight 35 gsm. The structures have reduced tensile elongation at 50 N per 5 cm fabric strip in MD under ISO 9073-3 standard norm. The structure has a basis weight of at least 9 ounces per square yard (305 grams per square meter). The structure also has heat resistance of at least 150° to 190° C., preferably over 200 up to 260° C. to for service under typical hot flue gas filtration conditions. Filter bags made from these structures provide a controlled dimensional stability over their entire filter life time. In addition such stable structures are suitable for lamination with fragile membranes especially e-PTFE membranes where minimum amount of mechanical damage to the membrane occurs.