Chipper knife for producing paper pulp, has two edge forming surfaces formed with thickened cutting edge portion in area next to cutting edge, where thickened cutting edge portion has shoulder edge towards rest of surface

摘要

The knife has a cutting edge (7) defined between two edge-forming surfaces (9, 10) at an acute angle to each other. Each edge forming surface is formed with a thickened cutting edge portion (12) in an area next to the cutting edge. The thickened culling edge portion has a shoulder edge (13) towards rest of the edge forming surface, and forms an angle to the rest of the edge forming surface. The edge portions are arranged on both edge-forming surfaces. The edge portions have a width in a range between four and six millimeters and a maximum thickness between one tenth and half of a millimeter. An independent claim is also included for a method of manufacturing a chipper knife.