METHOD FOR LUBRICATING A SURFACE SUCH AS A MOULD FOR THE FABRICATION OF A GLASS OBJECT

摘要

Method for lubricating a surface for the fabrication of a glass object wherein there is periodically deposited on the surface a lubricant layer. According to the invention, said lubricant layer is obtained by means of a heat source such as an oxy-fuel flame having a temperature higher than 2000 DEG K, through which there is injected during a predetermined time interval a gaseous hydrocarbon or a mixture of gaseous hydrocarbon comprising at least 15% of a constituent of which the ratio C/H between the number of carbon atoms and the number of hydrogen atoms is higher than 0.75, the injection speed of the hydrocarbon through the flame and the temperature of the latter being so controlled as to obtain a porous layer of carbonaceous particles capable of burning when in contact with air when they are deposited on the still hot glass object.