To obtain a push-cutting blade 2, a flexible base 1 and a projection (trapezoid-section projection 21) protruding from this base are formed by etching. Then, a lateral surface or surfaces of the projection 21 is cut into a vertical projection 2b. Lastly, the tip of the vertical projection 2b is sharpened...http://www.google.es/patents/US7284462?utm_source=gb-gplus-sharePatente US7284462 - Flexible die and method for its manufacture
