Patent ID: 7856853

Claim:
A method of manufacturing mineral fibers comprising: rotating an orificed spinner and supplying molten mineral material to the spinner to centrifuge streams of molten mineral material; directing a downward annular flow of attenuating gases to attenuate the streams of molten mineral material into mineral fibers; mixing combustion air and combustion gas and supplying the mixture to an annular burner positioned around the spinner; directing hot gases from the annular burner toward the spinner and the streams of molten mineral material to heat the spinner and assist in attenuating the streams of molten mineral material into mineral fibers; sensing with a pressure sensor the pressure of the combustion air prior to the mixing of the combustion air and combustion gas; controlling the pressure of the combustion air in response to the sensed pressure to maintain the pressure of the combustion air at a specific pressure; sensing the temperature of the combustion air prior to the mixing of the combustion air and combustion gas; and prior to the mixing the combustion air and combustion gas, controlling the temperature of the combustion air in response to the sensed temperature to maintain the combustion air at a specific temperature.