National Knife Company Inc.

National Knife Company Inc.

Manufacturer of Quality Circular Slitter Knives

182 Depot Street / P.O. Box 248
Berea, Ohio 44017

Fax: (440) 234-3993

Standard Style Score Cutters

Score cut slitting (also called crush cut) takes place under pressure from the knife holder at the tangent point of the knife and the "glass hard" platen roll of the machine. Because of the knife to the platen roll contact, the score cutter MUST have a CUTTING EDGE RADIUS. A pointed bevel angle would bend, roll over and flatten against the platen roll and would fail to cut.

The combination of bevel angle and edge radius is determined by the material to be slit. Since score cutters cannot use a point edge, but depend on a rounded edge for the seperating action, then slitting is more of a pressing apart of the material. The various materials to be slit will have different densities, abrasiveness, and thickness, so it is apparent that the proper bevel angle and edge radius be used to obtain the best results. For experience shows that a 30* included angle, .002-.004 edge radius is best for pressure sensitive tape and film, while a 60* included angle, .006-.010 edge radius is more suited for abrasive non wovens. This section shows varius cutter edges and materials as a starting point in selection of a cutter edge. Your experience on your machine and materials may show that a different angle and edge radius may work better. Whatever your choice, you can order the edge combination you want and get this same combination on every order you place.

Standard double bevel included angles for score cut slitter knives.

Below are just a few of the standard score cutters that National Knife Company Inc. manufactures.