An apparatus for the heat treatment of the necks 1 of performs 2 includes a rotatable mandrel 3, which is inserted in and engaged with the neck of the preform to rotate it, a fixed protective skirt 4, and a heater 5 situated at the level of the neck. A sliding weight 28 is applied to the upper end of...http://www.google.co.uk/patents/US4846656?utm_source=gb-gplus-sharePatent US4846656 - Apparatus for heat treatment of preform necks
