| 摘要 |
PURPOSE:To obtain a fiber reinforced cement board having strength comparable to that of a cement board contg. asbestos by uniformly dry-mixing cement with silica and aggregate, adding bundled vinylon fibers to the mixture, dry- mixing them and carrying out forming into a board shape and curing. CONSTITUTION:Cement is uniformly dry-mixed with silica and aggregate, vinylon fibers bundled with a binder are added to the mixture and they are dry-mixed until the bundled vinylon fibers are disintegrated and dispersed. The resulting starting material mixture is fed to the surface of a forming belt, formed into a board shape and cured with steam at a temp. below the deterioration temp. of the vinylon fibers, e.g. at 80 deg.C to obtain a fiber reinforced cement board. |
