Patent ID: 7311648

Claim:
A method of stamping a bending edge in a layer of package material, such as cardboard or plastics, for forming a workpiece for use in the folding of the package material to manufacture a box or the like, the method comprising: forming the bending edge by means of a stamping tool which is pressed down to form at least two slots on a stamped side of the package material that define the bending edge, while an opposite side remains substantially planer, providing a stamping tool ( 8 ) having at least two stamping ribs ( 9 ) for each bending edge which extend to the full extent of the bending edge, the at least two stamping ribs formed in a piece of flexible material, preferably steel plate, the stamping ribs corresponding to the dimensions of the bending edge to provide the bending edge as mutually spaced parallel slots; mounting the stamping tool in a machine selected from the group consisting of printing, stamping, punching rotary machines, or in a plano-machine; providing a level support having no grooves for receiving the stamping ribs; resting the layer of packaging material on the level support; and, pressing down said stamping ribs ( 9 ) into the layer ( 2 ) resting on the level support ( 10 ) to form a finish-stamped workpiece containing the bending edge made of parallel slots on the stamped side, the opposite side remaining substantially planar, in one step.