| 摘要 |
A printed wiring board having a conductor pattern on which a pre-flux film of a stabilized quality is to be formed using a water-soluble pre-flux liquid. To this end, such an apparatus is used which includes an etching unit 12 for etching lands 5 b , 6 b formed on the printed wiring board 1 , a rinsing unit 13 for rinsing the printed wiring board 1 , a bubble removing 14 for removing air bubbles 58 attached to the printed wiring board 1 on immersing the printed wiring board 1 in a water-soluble pre-flux liquid 9 a in a processing vessel 56 , a pre-flux forming unit 15 for forming a pre-flux film 9 on the lands 5 b , 6 b of the printed wiring board 1 in the pre-flux liquid 9 a using an in-liquid spraying unit 61 , a liquid removing unit 16 for removing the pre-flux liquid 9 a from the printed wiring board 1 transported from the processing vessel 56 and a rinsing unit 17 for rinsing the printed wiring board 1.
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