Self Supported Fluid Filter

摘要

A self-supported cylindrical corrugated filter ( 30 ) having arcuate side walls ( 34, 36 ) having over-lapping folded flaps which are non-adhesively joined i.e. by ultrasonic welding to provide a self-supported filter and a method of preparing the self-supported cylindrical corrugated air filter by using an ultrasonically weldable air filter blank that is corrugated to form a substantially cylindrical air filter ( 30 ) having two arcuate side walls ( 34, 36 ) with a plurality of open corrugation ends, folding the open corrugation ends to provide overlapping side wall flaps, and ultrasonically welding the overlapping side wall flaps to provide the self-supported cylindrical corrugated air filter and to provide the ultrasonically weldable air filter blank that can be corrugated.