Patent ID: 8545208

Claim:
A die for producing thermoformed articles such as food packaging or parts thereof, by thermoforming a plastic sheet and providing a mechanical weakening in the plastic sheet material between adjoining functional areas of the thermoformed article, which functional areas are separable at least partly from each other at the mechanical weakening when utilized by a user, the die comprising: an upper die; a lower die; and at least one perforating or stamping element having a perforating or stamping cutting edge that is disposed in the upper die or the lower die, the upper die and the lower die being movable relative to each other; wherein the perforating or stamping cutting edge comprises: a lower first section and an upper first section, the lower first section and the upper first section being staggered relative to each other in the direction of movement of the die, and each of the lower first section and the upper first section forming a section of the mechanical weakening; a connecting section between the upper section and the lower section and is formed at an angle other than 90° to the direction of movement of the die and forms a section of the mechanical weakening; wherein at least one of the lower first section and the upper first section comprises a plurality of alternating raised teeth and lowered recesses.