ROLLED AXIAL FLOW FILTER AND METHODS

摘要

Filter media includes a first layer 12 of porous filter media having first and second opposite sides and first and second edges 18,20; a first porous screen 32 oriented on the second side of the first layer of porous filter media, the first porous screen having first and second edges 34,36; a second layer 22 of porous filter media having first and second opposite sides and first and second edges, the second side of the second layer of porous media oriented on the first porous screen, a first sealant 44 securing the first layer 12, first screen 32, and second layer 22 together adjacent to the first edges of the first layer, first screen, and second layer,- a second screen 38 oriented on the first side of the second layer, the second screen having first and second edges 40,42; and a second sealant 46 securing the second screen 38 and the second layer 22 adjacent to the second edges of the second screen and second layer. The filter media can be coiled into a filter element resulting in a plurality of dirty fluid inlets 52 between the first layer second side and second layer second side, and a plurality of clean fluid outlets 58 between the first layer first side and second layer first side. Methods of making filter elements include providing a four layered construction of media, screen, media, and screen, and then coiling it into a filter element.