FILTER ELEMENTS FOR GAS OR LIQUID AND METHODS OF MAKING SUCH FILTERS

摘要

Tubular filter elements are formed by first feeding a dispersion of fibres in liquid into a tubular moulding space between a vertical core and a cylindrical fine mesh screen. Air pressure is applied to the ispersion so that the liquid drains through the screen and through a screen at one base of the space, while a mass of microfibres builds up to be removed from the space for bonding by a synthetic resin. A reciprocable sleeve increases the effective height of the screen as the mass builds up. The process packs the fibres in the circumferential direction more uniformly than is possible with prior techniques providing high filtering efficiency and a capacity to withstand high differential pressures.