| 摘要 |
A process for preparation of improved ceiling tiles having different densities at desired points involves the step of preparing a slurry mix of 40-45% hydrated calcium silicate gel and a low density binder; 20-25% reinforcing fibre selected from mineral wool, glass wool and paper pulp; 3-5% gypsum, cellulose pulp and fillers selected from pulverized fly ash and calcium carbonate, pouring the slurry mix into a mould, introducing a false form, subjecting to vacuum and pressure to obtain the more or less material at desired points, removing the false form and further subjecting the semisolid slurry to pressure from top to produce tile with or without reinforcing ribs. |
