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1. WO2002024424 - A PROCESS FOR MAKING GYPSUM BOARD HAVING IMPROVED THROUGH-PENETRATION STRENGTH

Publication Number WO/2002/024424
Publication Date 28.03.2002
International Application No. PCT/US2001/028957
International Filing Date 17.09.2001
IPC
B28B 19/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
28WORKING CEMENT, CLAY, OR STONE
BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG OR MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
19Machines or methods for applying the material to surfaces to form a permanent layer thereon
B28B 23/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
28WORKING CEMENT, CLAY, OR STONE
BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG OR MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
23Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material
CPC
B28B 19/0092
BPERFORMING OPERATIONS; TRANSPORTING
28WORKING CEMENT, CLAY, OR STONE
BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
19Machines or methods for applying the material to surfaces to form a permanent layer thereon
0092to webs, sheets or the like, e.g. of paper, cardboard
B28B 23/0006
BPERFORMING OPERATIONS; TRANSPORTING
28WORKING CEMENT, CLAY, OR STONE
BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
23Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; ; Production of reinforced objects
0006the reinforcement consisting of aligned, non-metal reinforcing elements
Applicants
  • UNITED STATES GYPSUM COMPANY [US]/[US]
Inventors
  • PETERSON, Kurt, N.
  • HESCHEL, Gerry, L.
  • ENGBRECHT, Dick, C.
  • JONES, Frederick, T.
Agents
  • LORENZEN, John, M.
Priority Data
09/665,88020.09.2000US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) A PROCESS FOR MAKING GYPSUM BOARD HAVING IMPROVED THROUGH-PENETRATION STRENGTH
(FR) PROCEDE RELATIF A L'ELABORATION D'UNE PLAQUE DE PLATRE A RESISTANCE A LA PENETRATION AMELIOREE
Abstract
(EN)
This invention relates to a process for making gypsum board comprising feeding a paper backing sheet and a fiberglass or plastic woven or non-woven scrim material in alignment to a board forming station, separating the paper and the scrim, feeding a high density calcium sulfate hemihydrate slurry into the trough formed between the paper and the scrim, and subsequently compressing the paper and the scrim into contact whereby the high density slurry is forced through the scrim, completely encapsulating the scrim in the high density slurry. As a result of this unique process, excellent bond is developed between the paper, the high density gypsum layer and the foamed gypsum core. The gypsum board has improved through-penetration strength.
(FR)
L'invention concerne un procédé relatif à l'élaboration d'une plaque de plâtre qui consiste à injecter selon un alignement, dans un poste de formage de plaque, une feuille dorsale en papier et un matériau de renfort tissé ou non tissé en fibre de verre ou en plastique, à séparer le papier et le matériau considéré, à injecter dans le creux établi entre le papier et le matériau une suspension épaisse de sulfate de calcium hémihydraté haute densité, puis à comprimer le papier et le matériau pour les mettre en contact, moyennant quoi la suspension épaisse est imprégnée dans le matériau sous contrainte, permettant ainsi d'encapsuler complètement le matériau dans ladite suspension. Ce processus novateur assure une excellente liaison entre le papier, la couche de plâtre haute densité et la partie centrale expansée du plâtre. Il en résulte une plaque de plâtre dont la résistance à la pénétration est améliorée.
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