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1. (WO2018089766) FILTER MEDIA HAVING A DENSITY VARIATION

Pub. No.:    WO/2018/089766    International Application No.:    PCT/US2017/061060
Publication Date: Fri May 18 01:59:59 CEST 2018 International Filing Date: Sat Nov 11 00:59:59 CET 2017
IPC: B01D 39/16
B01D 39/18
B01D 39/02
Applicants: HOLLINGSWORTH & VOSE COMPANY
Inventors: SCHÄFER, Sandra
BATTENFELD, Juergen
AHRENS, Felix
Title: FILTER MEDIA HAVING A DENSITY VARIATION
Abstract:
A filter media comprises more than one layer of synthetic fibers. The first layer having a thickness that extends from the bottom surface to the top surface, wherein the first layer has a density that changes from a maximum density to a minimum density. The density changes non-lineariy with thickness from the bottom surface to the top surface, wherein the change in density between the bottom surface to a dimensional thickness of 0.25 from the bottom surface is less than 20% of the maximum density, and wherein the change in density between a dimensional thickness of 0.5 from the bottom surface to a dimensional thickness of 0.75 from the bottom surface is less than 20% of the maximum density. A second layer of fibers is adjacent to the bottom surface of the first layer.