Profile: Markperi International Inc. is a supplier of new, used and remanufactured industrial radio frequency (RF) equipment. We offer a full range of shuttles, turntable and indexing equipment. We can modify or retrofit any RF machine to accommodate any production application. We can rebuild or recondition any RF equipment in the shortest period of time. Tube/mandrel sealing is a common technique when manufacturing IV bags. This RF tooling-based process involves welding the IV bag?s insertion tube between two plastic film layers to create a tight seal around the perimeter of the flexible container, as well as the tube weld within the perimeter.