Patent ID: 7934604
Filing Date: 2011-05-03
Classification: B01D

Abstract:
1. A filter module comprising a body of wound layers of a sheet material, said body having an inner peripheral surface and an outer peripheral surface, a winding axis and a passage extending along the winding axis of said body and in fluid communication with said inner peripheral surface, said sheet material having a plurality of openings formed therein, said openings forming two types of channels within the wound layers of sheet material of said body, said channels extending in a direction from the inner peripheral surface to the outer peripheral surface, a first type of channels being open at one end at said outer peripheral surface of the body and closed at the other end located adjacent to said inner peripheral surface, a second type of channels being open at one end at said inner peripheral surface of the body, in fluid communication with said passage and closed at the other end located adjacent to said outer peripheral surface, said channels of the one type being separated from the channels of the other type by portions of sheet material, one of said types of channels being inlet channels communicating with a fluid inlet of said filter module, the other of said types of channels being outlet channels communicating with a fluid outlet of said filter module, the module having more openings forming inlet channels than openings forming outlet channels, wherein the module has twofold or more inlet channels as compared to outlet channels and, a precoat, wherein the surface of at least one type of the channels supports the precoat.