| 摘要 |
PURPOSE:To prevent adhesion of foreign substance, such as resin powder or the like, generated from a prepreg by a method wherein the end surface or the whole surface of the prepreg, cut into manufacturing size of the sheet, is molten by heat and, thereafter, is cooled, upon forming a surface circuit for copper-clad laminate, base plate for multi-layer print sheet or the like. CONSTITUTION:Necessary number of sheet of prepregs, manufactured by impregnating the base plate with thermosetting resin varnish, drying it and cutting it into the size of the laminated sheet after forming, thereafter, melting the cut section and surface of the base plate, is heated and pressed. Melt prepreg can be manufactured by various method such as a method to pass the prepreg between two sets of heatable rolls, a method to pinch the prepreg between two sheets of heatable plates, a method to heat locally or wholely by hot air, a method to heat by high-frequency, a method to heat by magnetic flux, a method to heat by laser or the like. In order to obtain good melt prepreg, the prepreg should be heated to a temperature higher than the softening point of the resin and should not be heated to such high temperature that the resin gels in a short period of time or is decomposed. On the other hand, it is not preferable that the pressure is so high that it flows the resin remarkably or deforms the prepreg largely. |
