Process for producing a low density acoustical panel with...

E - Fixed Constructions – 04 – B

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E04B 1/82 (2006.01) C08L 3/02 (2006.01) C09D 1/00 (2006.01)

Patent

CA 2706130

A process useful for producing low density high mineral wool based acoustical panels with improved acoustical absorption properties using a water felting process is disclosed. The process includes forming a dilute slurry mixture including water, mineral wool, a thermoplastic binder and/or starch; and distributing the dilute slurry on a porous carrier to have the slurry dewatered to a base mat by gravity drainage to remove water by gravity. A vacuum is adjusted to gradually apply vacuum to the gravity dewatered base mat to further dewater the base mat without subjecting the mat to static pressure that would compress the base mat. The base mat is dried to form an acoustical ceiling product that has a low density and excellent acoustical absorption properties.

L'invention porte sur un procédé utile pour produire des panneaux acoustiques à base de laine hautement minérale à faible densité, avec des propriétés d'absorption acoustique améliorées à l'aide d'un traitement de feutrage à l'eau. Le procédé comprend les étapes de formation d'un mélange de pâte diluée comprenant de l'eau, de la laine minérale, un liant thermoplastique et/ou de l'amidon ; et de distribution de la pâte diluée sur un support poreux pour que la pâte se déshydrate sur un mat de base par un drainage par gravité pour retirer l'eau par gravité. Un vide est ajusté pour appliquer progressivement un vide au mat de base déshydraté par gravité pour déshydrater davantage le mat de base sans soumettre le mat à une pression statique qui comprimerait le mat de base. Le mat de base est séché pour former un produit de plafond acoustique qui a une faible densité et d'excellentes propriétés d'absorption acoustique.

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