Patent ID: 9174160
Filing Date: 2015-11-03
Classification: B01D

Abstract:
1. A method of forming a filter element comprising: providing a collapsible winding core; winding a fluted filter media about the collapsible winding core to form an intermediate filter element; collapsing the intermediate filter element; wherein the filter element is formed having an inlet face and an outlet face after said collapsing wherein fluid flowing from the inlet face to the outlet face must pass through the fluted filter media and thereby be filtered, the collapsible winding core being disposed between the inlet face and the outlet face; sealing the collapsible winding core to prevent any bypassing of unfiltered fluid through the collapsible winding core in the finished filter element for fluid flow between the inlet face and the outlet face; applying sealant to an outside surface of the collapsible winding core and allowing the sealant to seep through the collapsible winding core to an inner surface thereof to provide said sealing of the collapsible winding core; and providing perforations in the collapsible winding core and allowing sealant to seep through said perforations.