| abstract |
The present invention provides an improved method for producing a sandwich material made of reinforced plastic by a vacuum injection molding method, which exhibits stable quality without unimpregnation of resin, can be reduced in weight and cost. In the improved method, a liquid thermosetting resin is impregnated by a vacuum injection molding method on an impregnated material 2 in which a liquid-permeable reinforcing material is disposed on both surfaces of a liquid-permeable core portion. After that, it is cured. The liquid-permeable core is preferably a resin foam, a sheet-like body having a through hole, or a liquid-permeable sheet-like body filled with a granular material. As the liquid-permeable reinforcing material, a fiber base material such as a nonwoven fabric, a short fiber laminated mat-like material, a sheet-like material made of long fibers, a fabric, a woven fabric, or a knitted fabric is preferable. [Selection] Figure 1 |