Glass fiber facing sheet and method of making same

E - Fixed Constructions – 04 – F

Patent

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Details

E04F 13/04 (2006.01) B32B 7/06 (2006.01) B32B 13/14 (2006.01) B65D 65/40 (2006.01) E04F 13/02 (2006.01)

Patent

CA 2239041

The invention provides a glass fiber facing sheet for engineered surfaces such as cement boards which reduces the pitting associated with open mesh glass scrims. The glass fiber facing sheet comprises an open mesh glass scrim having a plurality of intersecting continuous multifilament yarns which are bonded at their crossover points to provide dimensional stability to the scrim. A melt blown polymer web is preferably joined to one face of the glass scrim and covers the mesh openings in the scrim. The opposed face of the scrim defines an exposed grid profile surface which is available for mechanical interaction between the scrim and the cementitious slurry used in cement boards. In cement boards, the glass fiber facing sheet of the present invention is preferably mechanically integrated into a surface portion of the cement core along the exposed grid profile of the scrim. A second facing sheet may also be mechanically integrated into an opposed surface portion of the cement core and contain a melt blown polymer web joined to one face. The present invention further includes a method of making the glass fiber facing sheet of the invention and a method of making a smooth cement board containing the glass fiber facing sheet of the invention.

La présente invention a pour objet un panneau de verre tissé pour surfaces artificielles telles les panneaux de fibragglo-ciment caractérisé par une réduction des piqûres associées aux renforts de tissus en treillis. Le panneau de verre tissé comporte un renfort de tissu en treillis présentant une pluralité de fils multifilamentaires continus entrecroisés qui sont liaisonnés à leurs points d'intersection afin d'assurer la stabilité dimensionnelle du renfort tissé. De préférence, un non-tissé de microfibres polymères est liaisonné à l'une des faces du renfort de tissu en treillis afin de recouvrir les ouvertures du treillis. La face opposée du renfort tissé expose une surface à treillis ouvert qui favorise l'interaction mécanique entre le renfort et le matériau cimentaire utilisé dans les panneaux de fibragglo-ciment. Dans les panneaux de fibragglo-ciment, le panneau de verre tissé qui fait l'objet de la présente invention est de préférence intégré dans une portion de la surface du noyau de ciment le long de la surface à treillis ouvert du renfort. Un deuxième panneau de renfort peut aussi être mécaniquement intégré dans la surface opposée du noyau de ciment et incorporer un non-tissé de microfibres polymères liaisonné à l'une des faces. La présente invention vise en outre un procédé pour la fabrication du panneau de verre tissé ainsi qu'un procédé pour la fabrication d'un panneau lisse de fibragglo-ciment incorporant le panneau de verre tissé faisant l'objet de la présente invention.

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