Process for the preparation of circuit-printed board having plated through-hole.

摘要

A process for the preparation of a circuit-printed board having a plated through-hole comprising the steps of: processing a board (3) having an electroconductive metal layer (2) on both surfaces to form a through-hole (4); plating at least wall (4a) of the through-hole (4) with an electroconductive metal (5); forming a resist layer (6) in the form of a reverse pattern for a desired circuit pattern over both surfaces of the board (3) except at least on the wall of the plated through-hole (4); depositing electrically an ionic resinous paint (9) over the plated wall (4a) of the through-hole (4) and an area of the surface of the board (3) where the resist layer (6) is not provided to form a deposited resinous paint layer thereon; removing the resist layer (6) to expose the electroconductive layer (5) (2) of the board (3) at the portion under the resist layer; removing the exposed portion of the electroconductive layer (5) (2) by etching; and removing the deposited resinous paint layer (9). The improvement comprises use of a photo-sensitive dry film for the formation of the reverse pattern. Another improvement comprises use of a specific aqueous solution for the removal of the resinous paint layer.