Compositions, panels and sheets comprising mineral fillers and methods to produce the same
There are provided gypsum panels, sheets and multi-layer sheets as well as methods of preparation thereof. For example, there are provided cellulose filament-reinforced gypsum panels, sheets and multi-layer sheets and methods of preparation thereof. For example, in such gypsum panels, sheets and multi-layer sheets gypsum is bound with cellulose filaments to strengthen the gypsum panels, sheets and multi-layer sheets. The cellulose filament-reinforced gypsum panel can be, for example, a core comprising a honeycomb or corrugated structure. There are also provided aqueous suspensions comprising cellulose filaments and CaSO 4 .2H 2 O.
1. A gypsum panel comprising a first multi-layer sheet, a second multi-layer sheet and a core comprising a honeycomb or corrugated structure sandwiched between said first multi-layer sheet and said second multi-layer sheet, said first multi-layer sheet, said second multi-layer sheet and said honeycomb or corrugated structure each comprising cellulose filaments and CaSO 4 .2H 2 O.
2. The gypsum panel of claim 1 , wherein said first multi-layer sheet is a facing, sheet and has from 2 to 10 layers.
3. The gypsum panel of claim 1 , wherein said second multi-layer sheet is a backing sheet and has from 2 to 5 layers.
4. The gypsum panel of claim 1 , wherein the density of said gypsum panel is less than about 0.45 g/cm 3 .
5. The gypsum panel of claim 1 , wherein the density of said gypsum panel is from about 0.20 g/cm 3 to about 0.30 g/cm 3 .