| 摘要 |
PURPOSE:To remove resin smears effectively, by empolying a series of processes in which a printed board is steeped in a chemical, both the end parts of the board are then made to rise and fall by turns using the center part of the board as a fulcrum. CONSTITUTION:A printed board 8 is steeped horizontally in a chemical so that the extending direction of hole 9 of the board 9 is perpendicular to the level of the chemical. As a result, during a smear 11 is dissolved in the chemical, gases which are generated in the holes 9 are easily released therefrom upward so that the chemical 12 fills in the holes 9 easily, which enhances the efficiency of the dissolution of the smear. Moreover, when both the end parts B and C of the board 8 are made to rise and fall by turns using the center part A of the board as a fulcrum, the chemical 12 fills in the holes 9 with being pressured so that the dissolution of the smear in the holes 9 is accelerated. Now, the mechanical shock is applied to both the end parts B and C in accordance with this vertical motion of the board 8, which promotes effectively the elimination of the smear sticking in the holes 9. |
