| 摘要 |
The installation for treatment by vapour, such as a vaporiser apparatus, includes a treatment enclosure 10, provided with an entrance air-lock 12 through which the strip of material to be treated 11 enters the enclosure 10; a similar air-lock is provided for the exit of the strip. To one at least of the entrance and exit air-locks, such as the air-lock 12, is linked a suction tube 13 for removing the slight flow rate of vapour admitted into the air-lock 12 in order to prevent the environmental air from entering the enclosure 10, thus precluding any propagation of vapour into the environment. A constant flow rate is ensured in the removal tube 13, for example with the aid of an adjustable fan 14, and the temperature of the air/vapour mix which passes into the tube is measured. The flow rate of new vapour arriving in the enclosure 10 can thus be adjusted in accordance with the temperature measured in the tube 13. <IMAGE>
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