| 摘要 |
A furnace ( 22 ) for heating a preform ( 10 ), includes an upper longitudinal heating tunnel ( 24 ) bounded transversely by the longitudinal vertical internal faces ( 36, 38 ) of two walls ( 40, 42 ), one wall ( 40 ), being equipped with a heating system ( 46 ), and the other wall ( 42 ), having aeration orifices ( 50 ) intended to let the air blown by a blower ( 52 ) pass transversely through them, and in which one portion ( 16 ) of the preform ( 10 ) is held outside the heating tunnel ( 24 ), a blower ( 52 ) blowing air transversely towards the portion ( 16 ) of the preform ( 10 ) so as to keep the constituent material of this portion ( 16 ) of the preform ( 10 ) at a temperature below its softening point, characterized in that the blower ( 52 ) includes two independent fans ( 54 a, 54 b) that deliver air to the aerated wall ( 42 ) and to the portion ( 16 ) of the preform ( 10 ), respectively.
|
