Refiner plate segments with anti-lipping feature

A refiner comprising:

• at least two facing refining assemblies, wherein each of the at least two facing refining assembly comprises a backing structure and refiner plate segments engaged to the backing structure;
• each refiner plate segment comprising:
• a substrate having an outer arc, and
• a series of alternating bars and grooves disposed on the substrate,
• wherein an area between the bars and the substrate defines a groove,
• wherein the series of alternating bars and grooves defines a refining surface,
• wherein a first refining assembly of the at least two facing refiner assemblies is configured to rotate around an axis of rotation,
• wherein the refining surface of the a first refining assembly faces the refining surface of a second refining assembly,
• wherein the refiner plate segments of the first refining assembly have a terminal edge perimeter defined by two or more terminal edges of bars disposed closest to the outer arc of the substrate of the first refining assembly,
• wherein the refiner plate segments of the second refining assembly have an outermost edge circumference defined by an outermost terminal bar edge of a bar disposed closest to the outer arc of the substrate of the second refining assembly, and wherein the terminal edge perimeter of the first refining assembly is not parallel to the outermost edge circumference of the second refining assembly.