Patent ID: 6068889
Filing Date: 2000-05-30
Classification: C03B,C23C

Abstract:
A method for lubricating a surface which comes into contact with hot glass by producing thereon a layer of lubricous graphite, said method comprising the steps ofmixing a methyl acetylene/propadiene gas at a first pressure which is less than 10 pounds per square inch gauge with oxygen gas at a second pressure which is less than said first pressure,directing the resulting gas mixture to and through a nozzle and toward a surface of it glass forming apparatus which contacts hot glass,igniting the gas mixture to form a flame produced by the combustion of the gas mixture which deposits a lubricating coating of graphite on the surface of the glass forming apparatus which contacts hot glass,controlling the gas flows so that the second pressure is sufficiently less than the first pressure that the gas mixture does not backfire within the nozzle when the flow of the gas mixture is stopped, andcontrolling the composition of the gas mixture and the rate at which it is discharged from the nozzle so that the flame produced by the combustion of the gas mixture does not exceed a temperature of 2000 degrees Kelvin,wherein up to 5 percent by volume of acetylene gas is mixed with the methyl acetylene/propadiene gas, based upon the total volume of acetylene gas and methyl acetylene/propadiene gas that is mixed with oxygen gas and directed through the nozzle, and the proportion of acetylene gas so mixed is controlled so that the flame produced by the combustion of the gas mixture has a desired length.