Product based on mineral fibers and process for obtaining it

Abstract

A thermal insulation product based on mineral wool, characterized in that the fibers have a micronaire of less than 10 l/min, preferably less than 7 l/min and especially between 3 and 6 l/min, and in that the material has a thermal conductivity of less than 31 mW/m·K, especially less than 30 mW/m·K. The parameters for obtaining this product are in particular the pressure of the burner, the rotation speed of the fiberizing spinner and the daily fiber output per spinner orifice.

1 . A thermal insulation product comprising fibers of mineral wool, wherein the fibers have a micronaire of less than 10 L/min and product has a thermal conductivity of less than 31 mW/m·K. 
     
     
         2 . The thermal insulation product of  claim 1 , having a density of at least 30 kg/m 3 . 
     
     
         3 . The thermal insulation product of  claim 1 , wherein the fibers are essentially parallel to length dimensions of the product. 
     
     
         4 . The thermal insulation product of  claim 1 , wherein a structure of the mineral wool comprises the fibers, bound together by a binder, in proportions of 5 to 8% by weight of the product. 
     
     
         5 . The thermal insulation product of  claim 1 , having a thickness equal to or greater than 30 mm. 
     
     
         6 . The thermal insulation product of  claim 1 , in the form of a cut panel, optionally comprising several layers. 
     
     
         7 . An acoustic insulation system comprising thermal insulation product of  claim 1 . 
     
     
         8 . The thermal insulation product of  claim 1 , comprising glass fibers with a proportion of unfiberized material of less than 1%. 
     
     
         9 . The thermal insulation product of  claim 1 , obtained from an internal centrifugation fiberizing process. 
     
     
         10 . A wall and/or roof lining comprising the product of  claim 1 . 
     
     
         11 . A process for manufacturing mineral wool with an installation comprising an internal centrifugation device that comprises a spinner capable of rotating about an axis X, and the peripheral band of which is drilled with a plurality of orifices for delivering filaments of a molten material, a high-temperature gas attenuating unit in the form of an annular burner, which attenuates the filaments into fibers, and a receiving belt associated with suction device for receiving the fibers, said process comprising
 controlling a combination of parameters, these being, at least, the pressure of the burner between 450 and 750 mmWC, rotation of the spinner at a speed greater than 2000 revolutions/minute, and daily fiber output per spinner orifice, which is at most 0.5 kg.   
     
     
         12 . The process of  claim 11 , wherein a throughput of molten material entering the spinner is less than 18 tonnes/day for a spinner having at least 32 000 orifices. 
     
     
         13 . The process of  claim 11 , wherein the spinner has a diameter of between 200 and 800 mm, and the fiber output per orifice is adapted to the diameter of the spinner. 
     
     
         14 . The process of  claim 11 , wherein the spinner has an orifice-perforated band height of at most 35 mm. 
     
     
         15 . The process of  claim 11 , wherein a diameter of the spinner orifices is between 0.5 and 1.1 mm. 
     
     
         16 . The process of  claim 11 , wherein the orifices of the spinner are distributed in several annular zones, and the orifices have, from one zone to another, rows of orifices of different diameter, and the diameter per annular row decreases, in a centrifugation position, from a top of a peripheral band of the spinner toward the bottom. 
     
     
         17 . The process of  claim 16 , wherein a distance between centers of neighboring orifices in a same annular zone may or may not be constant throughout an annular zone, and this distance varies from one zone to another by at least 3%, and, in the centrifugation position, decreases from the top of the peripheral band of the spinner toward the bottom, with a distance between 0.8 mm and 2 mm. 
     
     
         18 . The process of  claim 11 , wherein the installation further comprises a conveyor that extends the receiving belt, the run speed of the conveyor being greater than the run speed of the receiving belt, by more than 10%. 
     
     
         19 . The thermal insulation product of  claim 1 , wherein the fibers have a micronaire of less than 7 L/min. 
     
     
         20 . The thermal insulation product of  claim 1 , wherein the fibers have a micronaire of between 3 and 6 L/min.