A FLUID FILTER ELEMENT AND METHOD OF MANUFACTURING IT

摘要

A fluid filter comprises one continuous strip of resilient plastic material formed into the shape of a helix of n turns with a rectangular cross-section of width W and thickness t in a direction perpendicular to the strip length. At least one of the surfaces of the strip is embossed to form grooves. The helix is compressed so that adjacent turns abut one another with the grooves providing flow paths. The strip may be embossed and curved in one operation by feeding it between knurled frusto-conical rollers.