| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a desmearing method capable of removing smear caused by an inorganic material and an organic material reliably, without using a chemical requiring waste liquid treatment.SOLUTION: A desmearing method of a wiring board material produced by laminating an insulating layer composed of a resin containing a granular filler and a conductive layer includes an ultraviolet light irradiation step for irradiating the wiring board material with ultraviolet light having a wavelength less than 220 nm under a gas atmosphere containing oxygen, and a physical vibration step for giving physical vibration to the wiring board material passed through the ultraviolet light irradiation step.</p> |
