Patent ID: 8236210
Filing Date: 2012-08-07
Classification: B01D

Abstract:
1. A method of making a fluid treatment pack comprising forming a porous structure on a shaped mandrel having a longitudinal axis and at least one helical corrugation, including respectively forming first and second helically extending porous regions on first and second helically extending sloped regions of the helical corrugation, the first and second sloped regions intersecting one another along one of a helically extending mandrel crest and a helically extending mandrel trough and the first and second porous regions extending into one another along one of a helically extending crest and a helically extending trough to form a tubular, helically corrugated porous structure, wherein forming the porous structure includes relatively rotating the shaped mandrel and one or more dies arranged to direct fibers onto the shaped mandrel and depositing the fibers along the first and second helically extending sloped regions of the relatively rotating shaped mandrel to form a non-woven, helically-corrugated, porous fibrous structure having the first and second helically extending porous regions extending into one another along a helically extending crest or trough.