| 摘要 |
The device for implementing the method comprises an enclosure (10) which preferably contains a controlled atmosphere at a temperature below atmospheric pressure, and a tubular duct (11) connected at one end (12) to an enclosure (10) while its other end (13) is open. This duct is provided with a first branch conduit (15) connected to a duct (17) which is coupled with a vacuum pump, and a second branch conduit (16) connected to a supply of inert gas via a duct (18). In operation, the injection of gas and the simultaneous operation of the vacuum pump generates a counter-current A, B which compensates for any air seepage into the enclosure (10) through the opening (13) of the duct (11).
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