Patent ID: 8720726

Claim:
A one-piece lid for a cardboard based carton with a tab adapted to be placed in a pouring opening of the cardboard based carton, comprising: a semicircular flat base divided in two circular sections and two diametrically opposed parallel straight sections, the semicircular flat base is locked to the cardboard based carton by means of an induction process; a circumferential step with a smaller diameter than that of the semicircular flat base; a semicircular skirt, with a smaller diameter than that of the circumferential step and working as a protection wall of the tab, with a back horizontal flat surface and defining a front compartment with rectangular shape in which the tab is located, the front compartment formed by a horizontal flat surface with a central pouring orifice, two vertical sidewalls and one back vertical transverse wall defining the limit of the back horizontal flat surface; the tab is joined to the central pouring orifice by a horizontal tearing line or membrane and is joined to the back vertical transverse wall by a vertical tearing line and a hinge, the tab having a triangular shape that works as a closure of the one-piece lid when the horizontal and vertical tearing lines are fractured when pressing, and the one-piece lid is provided with a continuous vertical wall occluding the central pouring orifice.