Patent ID: 6176995
Filing Date: 2001-01-23
Classification: C25D,H05K

Abstract:
The method for electrolytically metallizing or etching perforated printed circuit boards having holes therein with a selected current density, comprising the steps of:(a) bringing printed circuit boards and at least one partly hollow electrode, with surface openings therein, into contact with a treatment agent;(b) polarizing the at least one electrode electrically relative to the printed circuit boards;(c) moving the printed circuit boards in a linear path of travel at a preset speed;(d) moving the at least one electrode in a rotating fashion with its periphery at a tangential speed equal to said predetermined speed;(e) supplying the treatment agent through the at least one partly hollow electrode;(f) wherein the step of supplying treatment agent includes passing the treatment agent under relative pressure through the openings in the at least one electrode while printed circuit boards are moved opposite the openings, so that the direction of flow of the treatment agent is only transverse to the path of travel of the printed circuit boards relative to holes of the printed circuit boards; and(g) wherein the step of passing the treatment agent through the at least one electrode includes suctioning the treatment agent through the at least one electrode.