Device and method for manufacturing receptacles provided with decorative wrap-around labels by thermoforming

A device for manufacturing receptacles provided with decorative wrap-around labels by thermoforming, the device including a mold block having at least one thermoforming chamber that has a side wall defining an inside surface, an axial opening, and a moving end-wall, opposite from the opening, and a wrap-around label insertion block having at least one wrap-around label insertion chamber and a piston mounted to move in the wrap-around label insertion chamber to push a decorative wrap-around label into the thermoforming chamber through said axial opening, the moving end-wall being configured to move along the inside surface in an end segment of the chamber between a positioning high level in which said moving end wall is configured to define an abutment for a lower edge of a wrap-around label placed in the thermoforming chamber and at least one thermoforming low level, and the device comprising at least one tongue-and-groove set comprising a fin on the end-wall, said fin being engaged in a notch in the inside surface of the end segment.