METHOD FOR THE PRODUCTION OF GLASS FIBER-REINFORCED GYPSUM SHEETS AND GYPSUM BOARD FORMED THEREFROM

摘要

A sheet cement (94) reinforced with fibers and is formed firstly by mixing in an air stream (74) of reinforcing fibers such as glass fibers and mineral materials based fine particles such as cement hemihydrate of calcium sulfate, both being dry, and then depositing the mixture on a movable perforated surface (79) by means of the air stream to form a sheet (87), applying water spray ( 92) in a stoichiometric quantity to hydrate the calcium sulfate hemihydrate in a dehydrated form and to provide the necessary degree of plasticity to the mixture, in densifying the sheet (87) by compression by means of rollers (93) and then firming and drying the sheet (94). A pair of sheets (94) may be used and, before use, they may be combined with a core (98) forms a paste of hemidhydrate calcium sulfate, e.g., the leaves and the core dry up and take to form a plate without paper (105) having a resistance, surface hardness, and excellent flame retardant properties.