A forming apparatus for forming objects by forming a sheet of thermoformable material includes a thermal conditioning station including a kiln for heating the material to an operating temperature, and a heating station positioned downstream of the thermal conditioning station and including a heating device to heat set portions of the material to a temperature near a softening temperature of the material. In order to reduce reject material at the restart of the apparatus following machine downtime, the kiln and the heating device are positioned near one another in such a manner that a part of the material interposed between the thermal conditioning station and the heating station is heated by the heat generated by a kiln and/or by the heating device.