| 摘要 |
PROBLEM TO BE SOLVED: To efficiently provide a prepreg of few air bubbles by means of ultrasonic resin impregnation. SOLUTION: This ultrasonic resin impregnation in a process for producing a resin-impregnated fibrous base material for synthetic-resin laminated boars comprises coating or impregnating one face or both faces of a fibrous base material with varnish which contains a resin for impregnation, keeping an ultrasonic vibrator 7a in contact with at least one face of the fibrous base material, thereby impregnating the inside of the base material with the varnish. |
