Importance

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Abstract

Filtration apparatus in which the filter medium is in the form of filter material assembled with a carrier web which is caused to traverse through a filter chamber in a zig zag path. The material and carrier web assembly spans between the side walls of the filter chamber and is advanced by turning rolls disposed at upper and lower levels. The carrier web for the filter material extends between flanges projecting from the side walls of the filter chamber and auxiliary support for the carrier web is provided by a foraminous shelf extending between the flanges between the turning rolls and imperforate shelf portions in advance of the first turning rolls and following the last turning roll. Support girders underlie the foraminous shelf to limit deflection of the filter medium. The filter medium is disposed so that its edges overlie the sealing flanges, thereby preventing flow of liquid medium around the edges of the filter medium. The carrier web is formed with imperforate side margins which cooperate with said flanges, and a foraminous zone medially therealong. The filter material covers the foraminous zone and its side edges are within said imperforate side margins. Preferably the filter material comprises a carbon-loaded mat of cellulosic fibrous material which is covered by a second mat of wet-strength glass fibrous material.

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First Claim