The ink box ring is a consumable, replaceable component of a pad printing ink box. The ink box ring slides over the etched surface of a printing plate and as such, it is critical to the application and removal of ink. Keller provides ink box rings in a wide variety of forms and sizes. The ink boxes made by Keller feature metal or ceramic ink box rings.
A schematic diagram of the operating principle of an ink box with its ring is shown HERE