Method and device for producing gypsum plasterboards

Details Method and device for producing gypsum plasterboards Method and device for producing gypsum plasterboards

B - Operations, Transporting

28

B

B28B 19/00 (2006.01) B28B 1/50 (2006.01)

Patent

CA 2462520

Known methods for producing gypsum plasterboards that have a low specific weight are often problematic in that pores reduce adhesion between the cardboard and the gypsum. Although many attempts have been made to improve adhesion, the plasterboards cannot be produced with the desired low specific weight. The aim of the invention is therefore to achieve, with little effort, an excellent adhesion between the cardboard and the gypsum and to produce boards with as low a specific weight as possible. For this purpose, after application of the gypsum onto a cardboard web and before the gypsum has set, one of the cardboard webs is subjected to a negative pressure on the side facing away from the gypsum. The invention also relates to a method for producing the inventive gypsum plasterboards.

Les procédés connus de fabrication de plaques de placoplâtre de poids spécifique faible possèdent un inconvénient, à savoir que les pores réduisent l'adhérence entre le carton et le plâtre. De nombreux efforts ont été déployés pour améliorer cette adhérence, mais le poids spécifique des plaques ne peut alors être aussi faible que désiré. Le procédé selon la présente invention permet d'obtenir avec des moyens simples une forte adhérence entre le carton et le plâtre, pour un poids spécifique des plaques maintenu aussi faible que possible. A cet effet, après application du plâtre sur une bande de carton et avant la prise du plâtre, au moins une des bandes de carton est soumise, sur sa face opposée au plâtre, à un vide partiel. La présente invention concerne également la fabrication desdites plaques de placoplâtre.

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