OPTIMIZED WAX FOR SEALING THE EDGE OF A FILTER SHEET

• Main Authors: SALE, RICHARD, D, PRINCE, RICHARD, A, ROESSLER, NORBERT, SCHIMMEL, MARK, W
• Format: Patent
• Language: English; French
• Published: 15.04.1999
• Edition: 6
• Subjects: GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; 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; TRANSPORTING

A filter sheet having a fluid impermeable wax layer coursing about an enclosed area of the filter sheet which is permeable to the fluid to be filtered, wherein the wax of the fluid impermeable wax layer has a durometer reading of about 75 to about 100 Shore A hardness at 25 DEG C and 85 DEG C, a melt point of about 110 DEG C to about 180 DEG C, and a viscosity of less than about 100 cP at 155 DEG C and preferably comprises ethylene bis stearamide. La présente invention concerne une feuille de filtre pourvue d'une couche fluide de cire imperméable entourant une zone fermée du filtre, laquelle zone est perméable au fluide à filtrer. En l'occurrence, la cire de la couche de cire imperméable au fluide présente une dureté Shore de 75 à 100 environ à 25 DEG C et 85 DEG C, un point de fusion de 110 DEG C à 180 DEG C environ, et une viscosité inférieure à 100 cP à 155 DEG C. Cette cire comporte de préférence un éthylène di-stéaramide.