A fibre forming device for fabricating mineral fibres, includes a fibre forming spinner wheel pierced to enable centrifugal fabrication of the fibres, the fibre forming device including at least one annular burner producing an annular gas flow to stretch the fibres and an evacuation system for evacuating smoke created by the burner, the device further including a system adapted to vary the temperature of the spinner wheel, the temperature variation system being a device for circulation of air between the annular burner and the evacuation system to control the smoke evacuation flow.

The invention relates to an apparatus for manufacturing mineral wool. The apparatus includes means (1) for producing molten mineral material, at least one fiberizing device (3) for forming fibres, into which fiberizing device the molten mineral material is fed (2) and by which fibres (12) are formed. The fiberizing device (3) comprises, rotationally arranged around a vertical axis (15), at least one fiberizing plate (13) having a vertical peripheral edge, into which are formed numerous small-sized holes (14), through which the molten material is led by centrifugal force to form fibres (12). Into the fiberizing device (3) are arranged elements to produce a vertical flow of blowing medium (16) to be led around the fiberizing plate (13), the flow causing the fibres (12) to turn downwards and, at the same time, to thin. Downstream the fiberizing device (3) is arranged a collection device (6), into which the formed fibres (12) are led and collected into a mat-like material. In connection with said at least one fiberizing plate (13) is arranged a substantially horizontal, relatively narrow channel (5), through which the fibres (12) are brought into the chamber space (7) of the collection device (6). The invention further relates to a method for manufacturing mineral wool and a mineral wool product manufactured by the method

The invention relates to an apparatus for manufacturing mineral wool. The apparatus includes means (1) for producing molten mineral material, at least one fiberizing device (3) for forming fibres, into which fiberizing device the molten mineral material is fed (2) and by which fibres (12) are formed. The fiberizing device (3) comprises, rotationally arranged around a vertical axis (15), at least one fiberizing plate (13) having a vertical peripheral edge, into which are formed numerous small-sized holes (14), through which the molten material is led by centrifugal force to form fibres (12). Into the fiberizing device (3) are arranged elements to produce a vertical flow of blowing medium (16) to be led around the fiberizing plate (13), the flow causing the fibres (12) to turn downwards and, at the same time, to thin. Downstream the fiberizing device (3) is arranged a collection device (6), into which the formed fibres (12) are led and collected into a mat-like material. In connection with said at least one fiberizing plate (13) is arranged a substantially horizontal, relatively narrow channel (5), through which the fibres (12) are brought into the chamber space (7) of the collection device (6). The invention further relates to a method for manufacturing mineral wool and a mineral wool product manufactured by the method

A NiCrFe-based casting alloy is provided for use in manufacturing a component for contacting molten glass, such as a centrifugal spinner for forming fibers of a molten glass by a rotary fiber forming process, for example. This NiCrFe-based casting alloy is suitable for use in manufacturing a component for contacting molten glass, and contains, in terms of mass percent, 15-30% Cr, 15-30% Fe, 2.5-5.0% Co, 3.0-6.0% W, 0.0-2.0% Ti, 0.5-2.5% Nb, 0.5-2.0% Mo, and 0.5-1.2% C, the remainder including nickel and unavoidable impurities.

Glass fibers have a chemical composition that includes the following constituents, in a weight content that varies within the limits defined below: SiO.sub.2 50-70%, Al.sub.2O.sub.3 0-5%, CaO+MgO 0-7%, Na.sub.2O 5-15%, K.sub.2O 0-10%, BaO 2-10%, SrO 2-10%, ZnO <2%, and B.sub.2O.sub.3 5-15%.

The present invention relates to a metal alloy, characterized in that it comprises, in percent by weight on the total weight of the alloy, 1-4% of niobium (Nb), 0-0.5% of hafnium (Hf), 27-29% of chromium, 1-5% of nickel (Ni), 0.3-0.45% of carbon (C), 0-2% of tantalum (Ta), 0-2% of titanium, 1-3% of iron, less than 0.5% of manganese (Mn), less than 0.3% of silicon (Si), less than 0.2% of zirconium (Zr), the remainder being cobalt (Co) and unavoidable impurities. This metal alloy has superior mechanical strength characteristics at high temperature which make it suitable for the manufacture of a manufactured article, in particular a spinner, for the production of mineral fibers, such as glass fiber, rock fiber and the like.

The invention relates to a fiberglass material manufacture method and facility, were in molten glass is converted into fiberglass material via the steps of spinning, drawing, sizing, and collecting, followed by a step of producing a resulting fiberglass material that is then subjected to thermal desizing. The fumes from the melting furnace are used to preheat a combustion reagent from the melting furnace in two steps: a first step in which air is heated via heat exchange with the fumes, and a second step in which the combustion reagent is preheated via heat exchange with the hot air, the air then being used in the step of desizing the fiberglass material.

The invention relates to a fiberglass material manufacture method and facility, were in molten glass is converted into fiberglass material via the steps of spinning, drawing, sizing, and collecting, followed by a step of producing a resulting fiberglass material that is then subjected to thermal desizing. The fumes from the melting furnace are used to preheat a combustion reagent from the melting furnace in two steps: a first step in which air is heated via heat exchange with the fumes, and a second step in which the combustion reagent is preheated via heat exchange with the hot air, the air then being used in the step of desizing the fiberglass material.

Mineral fibers have a chemical composition including the following constituents, as weight percentages: SiO.sub.2 30% to 50%, Al.sub.2O.sub.3 10% to 20%, CaO+MgO 20% to 35%, Na.sub.2O+K.sub.2O 1% to 10%, wherein the mineral fibers include a content of total iron, expressed as Fe.sub.2O.sub.3, of from 5% to 15% and a redox, which corresponds to the weight ratio between the content of ferrous iron, expressed as Fe.sub.2O.sub.3, and the total content of iron, expressed as Fe.sub.2O.sub.3, of less than 0.6.

Mineral fibers have a chemical composition including the following constituents, as weight percentages: SiO.sub.2 30% to 50%, Al.sub.2O.sub.3 10% to 20%, CaO+MgO 20% to 35%, Na.sub.2O+K.sub.2O 1% to 10%, wherein the mineral fibers include a content of total iron, expressed as Fe.sub.2O.sub.3, of from 5% to 15% and a redox, which corresponds to the weight ratio between the content of ferrous iron, expressed as Fe.sub.2O.sub.3, and the total content of iron, expressed as Fe.sub.2O.sub.3, of less than 0.6.