LAMINATED FILTER MEDIUM FOR ULTRA - AND MICROFILTRATION AND METHOD FOR ITS MANUFACTURE Russian patent published in 2001 - IPC

FIELD: production of filter media for ultra- and microfiltration, applicable in medicine, pharmaceutics, biotechnology, electronic, chemical and food industry. SUBSTANCE: the laminated filter medium for ultra- and microfiltration has successively laid inlet and outlet filter beds of track membranes and an intermediate bed placed between them. It differs from the known ones by the fact that the intermediate bed represents a partition with through holes separating the track membranes and hermetically connected to the latters over the surfaces of their contact. The method for manufacture of the claimed filter medium consists in successive laying of the membranes one on the other and of the intermediate bed between them, interconnection of them and is featured by the fact that k track membranes, where k - the natural number more than two, as a minimum, between two adjacent track membranes positioned is an intermediate bed in the form of a partition with through holes, they are hermetically interconnected over the surfaces of the contact, and the adjacent track membranes are sealed hermetically around the edges. EFFECT: enhanced selectivity of the medium. 17 cl, 3 dwg