Modelling The Process Of Glass Flow From A Container With A Bottom Nozzle.

A mixture of glycerine and molasses was used to establish the optical conditions for the flow of a crown glass melt from a 50 litre crucible. The results were found to be applicable to molding under production conditions. In order to obtain high quality glass the drop height into the mould must be as small as possible and not greater than 60mm, molten glass with a viscosity of 250-500 P should be used for molding through nozzles with a diameter of 50-600mm, the bottom layers of the melt should be free from striae as these are distributed within the entire mould volume, and the last 10-20% of the glass should not be used.