| 摘要 |
PURPOSE:To repeatedly print an etching liquid on a surface to be etched with a high accuracy, by a method wherein a thickened aqueous etching liquid is screen printed on a material to be etched by using a screen printing plate formed by coating with a solvent base photosensitive resin. CONSTITUTION:Hydroxyethyl cellulose is dissolved into an aqueous 10wt% solution of hydrochloric acid in a concentration of 25wt% to prepare a thickened etching liquid. Further, an ink for screen printing is prepared by adding 5wt% of glycerin. Then, a vinyl cinnamate base ultraviolet-curing resin is applied onto a screen printing plate formed of polyester fibers, thereafter an original copy provided with a pattern of 0.5mm. in width in such a manner as to pass the ink therethrough is placed on the screen printing plate, and is exposed to ultraviolet rays, followed by developing to produce the screen printing plate for applying the thickened etching liquid in a pattern form. The thickened etching liquid is printed on an electrically conductive surface of a film through the screen printing plate. |
