Coating processes – Spray coating utilizing flame or plasma heat
Patent
1999-08-24
2000-05-30
Parker, Fred J.
Coating processes
Spray coating utilizing flame or plasma heat
427450, 427133, 427223, 4272496, 65 24, 65 26, 65170, B05D 108, C23C 1626
Patent
active
060688890
ABSTRACT:
A method for lubricating glass contacting surfaces of glass forming equipment is disclosed. The method comprises the steps of delivering MAPD gas to a venturi at a low pressure, preferably below 10 p.s.i., and delivering oxygen to the venturi at a lower pressure, usually half or less than half of the pressure at which the MAPD gas is delivered to the venturi. The MAPD gas and the oxygen are mixed in the venturi and delivered to and through a nozzle which is directed toward a glass contacting surface. The mixture is ignited as it leaves the nozzle; its flow is controlled so that the temperature of the flame is between approximately 1500 and 1800 degrees K. By controlling the temperature of the flame, the method is operable to deposit on the glass contacting surface a lubricating coating of graphite including a substantial percentage of flat plate graphite. Also disclosed is a method which involves mixing up to about 5 percent by volume of acetylene with the MAPD gas, before the latter is mixed with oxygen gas; the acetylene-containing mixture produces a longer flame, which is capable of reaching the bottoms of relatively deep molds, than does a mixture of MAPD gas and oxygen. In some situations, for example, lubricating conveyor belts for transporting hot glass, natural gas is substituted for the oxygen and lubrication is achieved with less use of the MAPD gas.
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Parker Fred J.
Purdue David C.
Purdue John C.
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