Filtering material and process for producing same

Abstract

The invention relates to a filtering material and a process for producing same. The proposed material can most advantageously be used in filter elements of internal-combustion engines, ventilation and air-conditioning systems, dust- and gas-collecting apparatus, and systems of purifying petroleum products of various viscosities and degrees of contamination, as well as for filtration of liquid foodstuffs, chemicals, and domestic sanitary and hygienic products. The filtering material contains 60 to 85% by volume of pores 5 to 40 microns in size, varying in diameter by no more than 5 microns. According to the proposed process, preshredded cellulose-containing material is refined in an air medium, at a concentration of at least 80% BD, to an average fiber length of 0.3 to 2.5 mm with subsequent dispersion of said fiber in an aqueous medium to obtain a uniform fibrous suspension with a concentration of 1.5 to 6% and make-up of the furnish from the suspension and additives.