| 摘要 |
PURPOSE:To maintain size accuracy by inclusion of glass cloth formed of filaments having the rough surface into insulator layer of a printed wiring board. CONSTITUTION:A filament 1 having rough surface is formed by executing chemical processing to the monofilament surface using an ordinary glass. Next, a strand is formed, for example, by binding 60 filaments 1. Next, the strand 2 is woven alternately in the vertical and lateral directions to obtain glass cloth 3. Next, the glass cloth 3 is impregnated with a thermosetting resin, for example, an epoxy resin 5 to make the resin to half-hardening condition. Thereby prepreg can be obtained. Next, the prepreg and a copper foil 4 are laminated and heated and pressed for two hours at 170 deg.C to form a copper laminated plate. Since each monofilament has the rough surface, sliding between filaments, strands and glass cloths is suppressed and size accuracy of the printed wiring board can be maintained. |
