| 摘要 |
PURPOSE:To obtain a prepreg which is almost free from moisture, evenly impregnated with resin and suitable for preparing a paper substrate copper plated laminated board, etc. excellent in electric insulating capacity by such an arrangement wherein a cellulose substrate impregnated with resin solution is heated by microwave under hot moisture atmosphere and then it is dried. CONSTITUTION:A resin impregnated substrate 2 is prepared by passing a substrate 1 through a resin solution tank 11 and it is sent to a hot moisture microwave processing chamber 13 through squeeze rolls 12 and microwave heated under hot moisture atmosphere (preferably under heated hot moisture atmosphere of which relative humidity is 100%), and then sent to a drying machine 16 and dried there, and the titled prepreg (preferably resin content is 10-60wt%) is thus obtained. As said substrate, a kind of kraft paper, e.g., is used and as a resin solution, e.g., a solution wherein preferably 60-100wt% of phenol resin are dissolved in a solvent such as water, etc. is used. |
