| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a compact and high-performance PAS nitrogen gas generating device and to enable assembling of the device into an automatic soldering device by using a specified adsorbent to decrease the volume of an adsorption tower and combining specified operational conditions. SOLUTION: As for the adsorbent, a molecular sieve carbon or the like is used. The molecular sieve or the like has such properties that when it is used for a single component adsorption under 2.5kgf/cm<2> .G pressure, it shows 24.0 to 30.0mg/g oxygen adsorption and 6/0 to 12.0mg/g nitrogen adsorption after one minute of adsorption and that the ratio of oxygen adsorption to nitrogen adsorption after one min. is 2.0 to 5.0. The effective volume per one adsorption tower is 0.10 to 0.050Lmin/NL for the average supply amt. of source air, and the average output of the product nitrogen gas is 0.15 to 0.45 times as the average supply amt. of the source air. Moreover, the adsorption and desorption cycle includes processes of adsorption, pressurizing and regeneration, and the adsorption process in the tower is performed in 40 to 120sec. Thus, the necessary amt. of nitrogen gas thus produced is controlled to the min., the gas is effectively used, and soldering can be performed in a good state with a small amt. of gas.</p> |
