Patent ID: 9061233
Filing Date: 2015-06-23
Classification: B01D

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