| 摘要 |
<p>[PROBLEMS] In a conventional reflow furnace in which flux fume produced in the furnace is led to the outside for purification, the flux fume is not sufficiently removed, and the flux fume remains in an inert gas circulated in the furnace. As a consequence, in such a conventional reflow furnace, flux fume tends to adhere to a furnace wall, and the adhered flux fume sometimes drops to soil a printed circuit board. [MEANS FOR SOLVING PROBLEMS] In a reflow furnace of the invention, flux fume produced in the furnace is led to the outside, and almost the entire flux fume is removed at a filter section as a removing device. In the filter section is installed a paper block-like filter having a large number of long holes, and the long holes are oriented in the direction of flow of the flux fume.</p> |
