A folding station includes an inlet and an outlet and is predisposed to receive at the inlet a cardboard blank having two transversal edges, two longitudinal edges, two longitudinal score lines, and four transverse score lines. The two longitudinal score lines define therebetween a central sector and also define two lateral sectors externally of the two longitudinal score lines. Cuts in the two lateral sectors define a series of flaps. The folding station further comprises a conveyor for transporting the cardboard blank in an advancement direction to a position, a first folding bar located by a flank of a first side of the conveyor at the position, and a second folding bar located by a flank of a second side of the conveyor at the position. The first folding bar and the second folding bar rotate to fold the flaps in the two lateral sectors onto respective portions of the central sector of the cardboard blank.