FLUX COATING METHOD AND FLUX COATER

摘要

PROBLEM TO BE SOLVED: To easily and surely set the flow rate of a gas in the flux coater for spraying an atomized flux from a nozzle supplied with the flux and gas. SOLUTION: This coater is provided with a flux supply means 36 for supplying a flow-controlled flux to a nozzle 32 for spraying the atomized flux on a printed circuit board P while being relatively moved equidistantly from the board. A gas supply means 37 is furnished to supply a flow-controlled flux atomizing gas to the nozzle 32. An arithmetic control part 53 is provided to control the set flow rate of the gas supplied to the nozzle 32 by the means 37 in accordance with the set flow rate of the flux supplied to the nozzle 32 by the means 36 and the grain diameter of the atomized flux. The gas supply means 37 is furnished with plural orifices 51 connected to a gas supply pipeline 49 in parallel with one another and plural opening and closing valves 52 connected to the orifices 51 respectively in series. The gas flow rate is controlled by a combination of the opening and closing valves 52.