Cementitious board and process for its manufacture

Details Cementitious board and process for its manufacture Cementitious board and process for its manufacture

E - Fixed Constructions

04

B

E04B 1/86 (2006.01) B26F 1/14 (2006.01) B26F 1/24 (2006.01) B28B 11/08 (2006.01) B28B 11/12 (2006.01) B28B 19/00 (2006.01) E04B 9/00 (2006.01) E04B 9/04 (2006.01) E04C 2/288 (2006.01)

Patent

CA 2246245

A die assembly (10) for providing a gypsum ceiling tile having improved acoustic absorption properties comprises a punch plate (16) having punches (12) which form perforations through a plasterboard tile and indentors (14) which form identations in the tile. The punches and indentors are arranged in elongate strips to produce fissure-like perforations and indentations. A stripper plate (24) having apertures (28, 28') corresponding to the punches and indentors and a die plate (26) having apertures (30) corresponding to the punches sandwich the tile, and the punch plate is applied to the tile. The invention embraces the tile, the die assembly and a method of making the tiles.

Ensemble matrice (10) servant à fabriquer un carreau de plafond en plâtre possédant des propriétés améliorées d'absorption acoustique. Cet ensemble comprend une plaque à poinçons (16) possédant des poinçons (12) pratiquant des perforations à travers un carreau en placoplâtre, ainsi que des pénétrateurs (14) pratiquant des entailles dans le carreau. Ces poinçons et ces pénétrateurs sont disposés en bandes allongées, de manière à produire des perforations et des entailles semblables à des fissures. Une plaque de démoulage (24) pourvue d'ouvertures (28, 28') correspondant aux poinçons et aux pénétrateurs et une plaque de matrice (26) possédant des ouvertures (30) correspondant aux poinçons prennent le carreau en sandwich et on applique la plaque à poinçons sur le carreau. L'invention concerne le carreau, l'ensemble matrice et un procédé de fabrication des carreaux.

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