Friction Ring Ball-Lock

A friction ring ball lock (often referred to as a friction ring or differential ring for slitter rewinders) is a specialized mechanical component used in web converting to manage multi-roll rewinding on a single shaft. When slitting a wide web of material—such as plastic film, paper, or foil—into multiple narrower rolls, slight variations in material thickness across the web cause some rolls to wind tighter or looser than others. Friction rings solve this problem by slipping independently on a central friction shaft, allowing each individual core to rotate at its own required speed and…Read update