| 主权项 |
1. Oven (10) for the heat treatment of thermoplastic preforms (12) each respectively comprising a first part (14, 16) in its definitive shape and a second part (18, 20) intended to be heated by heating means (30) arranged along at least part of a determined heating path followed by the preforms (12) travelling through the oven, the said oven (10) comprising a cooling system (36) capable respectively of cooling the first parts (14, 16) and the second parts (18, 20) of the preforms, characterized in that the cooling system (36) comprises at least one cooling device (42) capable of air-cooling at least the second part (18, 20) of the preforms (12), the said cooling device (42) comprising at least ventilation means (52) capable of delivering a given flow rate of cooling air and means (58, 64) for selectively varying, along the heating path of the preforms (12), at least the cooling airflow rate delivered by the said ventilation means (52) for cooling the said second parts (18, 20) of the preforms (12). |
