B - Operations – Transporting – 28 – B
Patent
B - Operations, Transporting
28
B
B28B 19/00 (2006.01) B28B 23/00 (2006.01) B28B 23/02 (2006.01)
Patent
CA 2405808
This invention relates to a process for making gypsum board comprising feeding a paper backing sheet and a fiber-glass 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.
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.
Engbrecht Dick C.
Heschel Gerry L.
Jones Frederick T.
Peterson Kurt N.
Company United States Gypsum
Macrae & Co.
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