| 摘要 |
A method for cleaning a surface of a resin layer capable of sufficiently improving peel strength of a metal film formed by plating on a surface which is roughened by performing a desmear treatment on a resin layer containing a resin added with a large amount of filler is provided. The method is characterized in that, when a surface of a resin layer on which a metal film is formed by plating is roughened by a desmear treatment and, then, the thus-roughened surface of the resin layer is cleaned, the surface of the resin layer formed with a resin compounded with a filler in an amount of 20 wt % or more such that a difference of a coefficient of thermal expansion between the resin layer and the metal film is allowed to be reduced is roughened by subjecting it to the desmear treatment and, secondly, the filler which is deposited on the thus-roughened surface of the resin layer is removed by ultrasonic cleaning in which ultrasonic vibration of a frequency of from 35 to 50 kHz is applied.
|
