Patent ID: 6340402
Filing Date: 2002-01-22
Classification: A62B,B01D,Y10S

Abstract:
A method of assembly of a NBC filter comprising a tubular formation of an inner filter medium closed at at least one end by a metallic inner end cap having a first peripheral skirt, a tubular mass of granulated carbon surrounding said inner filter medium to form an outer filter medium, a mesh tube enclosing said outer filter medium, an annular, resilient gasket surrounding said inner end cap and an outer end cap of metallic material having a second peripheral skirt which, in use, surrounds one end of the mesh tube while the gasket is compressed between the outer end cap and the carbon mass,the method comprising interposing a thixotropic adhesive between the inner periphery of the gasket and the first peripheral skirt of the inner end cap, between the outer periphery of the gasket and mesh tube and between the gasket and the outer end cap, and allowing said adhesive to cure, wherein during assembly and before said adhesive cures said adhesive fills any voids between said mesh tube, said gasket and said outer end cap, and after curing said adhesive provides a seal against escape of particulate matter from said carbon mass but retains sufficient resilience to allow said gasket to function, and wherein said adhesive does not bond said inner filter medium to said inner end cap.