Patent ID: 8602767

Claim:
An in-mold cutting unit for a thermoforming machine having at least one mold element, at least one counter-mold element positioned and configured to cooperate, in use, with the respective mold element, and an actuator configured to command a relative movement of said respective mold and counter-mold elements, said in-mold cutting unit comprising: at least one annular knife element comprising a sharp edge; at least one counter-cutting element for each respective annular knife element, the at least one counter-cutting element defining a sharp counter-edge portion; and at least one witness-forming insert configured to be housed removably in a respective reception seat at said at least one annular knife element or said at least one counter-cutting element, and the at least one witness-forming insert delimiting at least one recess or incision thereon, the at least one recess or incision, during use, positioned adjacent to, and extended transversely with respect to, said sharp edge of said at least one annular knife element or to said at least one sharp counter-edge portion configured for formation of a respective witness between at least one thermoformed object and a residual web, where the respective thermoformed object remains anchored to the residual web.