| 摘要 |
PROBLEM TO BE SOLVED: To polish a printed circuit board effectively. SOLUTION: A bulged part of an ink put in a hole formed in a printed circuit board (work) W is polished by a rotary polishing tool 20 while the printed circuit board W is being transported, wherein the board transporting speed Vp should range between 1 and 5 m/min, and the ratio Vf/Vp is made 300-800, where Vf represents the peripheral velocity of the polishing tool 20 in rotating and ranges between 1000 and 1200 m/min. |
