The boxes coming from the packaging line already closed on their lower side, enter into the taping machine and reaches two lateral belts that bring them towards the taping area. The intervention of a mobile folder provides to bend the backwards short flap and, during the advancement, some fixed folders bends the long flaps. Then the closed box reaches the taping group that applies the PVC tape on the upper part and then lets it exit from the machine. The taping machine is easy to use and with simple size changeovers (two manual wheels for the adjustment of the height and width of the box).