Glass reinforced gypsum board and method of manufacture

B - Operations – Transporting – 32 – B

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B32B 3/06 (2006.01) B28B 11/08 (2006.01) B28B 19/00 (2006.01) B32B 5/12 (2006.01) B32B 13/00 (2006.01) B32B 13/02 (2006.01) B32B 13/06 (2006.01) B32B 15/08 (2006.01) B32B 25/02 (2006.01) B32B 25/10 (2006.01) B32B 27/04 (2006.01) B32B 27/14 (2006.01) D04H 3/08 (2006.01) E04C 2/04 (2006.01) F16G 5/00 (2006.01)

Patent

CA 2449781

A multi-layer gypsum board having face sheets comprising inorganic fiber randomly oriented glass fiber, completely impregnated with gypsum slurry penetrates through the random interstices between the inorganic fibers and coats the board surfaces with gypsum slurry. The multi-layer gypsum board may have a polymeric compounded added to unset gypsum, where the compound may comprise one of the following; plyacrylamide, polymethylacrylamide, polyvinyidene chloride, polyamide, poly(hexamethylene adipamide), polyvinylchloride, polyethylene, cellulose acetate, polyisobutylene, polycarbonate, polypropylene, polystyrene, polychloroprene, styrene, butadiene, natural rubber, poly(2,6 dimethyl pentene oxide), poly(4-methyl-1- pentene) and polydimethyl siloxane. The multi-layer gypsum board may comprise a first layer of a mixture of polymeric compound additive and set gypsum having an outer surface and being impregnated in a thin sheet of randomly aligned inorganic fibers so as to encase the core gypsum within two facing layers having a combination of set gypsum and polymeric compound.

Une plaque de plâtre multicouche comprenant des feuilles protectrices formées de fibres inorganiques, de préférence de fibres de verre à orientation aléatoire, entièrement imprégnées avec de la pâte de plâtre qui pénètre dans les interstices aléatoires existant entre les fibres inorganiques et recouvre les surfaces de la plaque avec la pâte de plâtre. La plaque de plâtre multicouche peut comprendre un additif de composé polymère qui est ajouté au plâtre frais, ledit composé pouvant être un des composés suivants: polyacrylamide, polyméthylacrylamide, chlorure de polyvinylidène, polyamide, poly(hexaméthylène adipamide), chlorure de polyvinyle, polyéthylène, acétate de cellulose, polyisobutylène, polycarbonate, polypropylène, polystyrène, polychloroprène, styrène, butadiène, caoutchouc naturel, poly(2,6 diméthyl pentène oxyde), poly(4-méthyl-1-pentène) et polydiméthyl siloxane. La plaque de plâtre multicouche peut comprendre une première couche formée d'un mélange d'additif de composé polymère et de plâtre durci, qui présente une surface extérieure et qui est imprégnée d'une mince feuille de fibres inorganiques à alignement aléatoire de manière à enfermer le plâtre du noyau à l'intérieur de deux couches opposées comprenant un mélange de plâtre durci et de composé polymère.

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