Enamel is a glass like material formed by melting with an inorganic compound containing mainly oxides which is fused in one or more layers onto metal or glass items at a temperature over 450°C.
Enamel - melting
Video ( in German language)
Rotation melting furnace, cooling with water cooled steel rolls
Porcelain Enamel – melting process (production of frits)
Different mixed raw materials are melted at a temperature of 1200 -1300°C. This melting process can be done in a rotary furnace or a continuous smelter. The melt is quenched and cooled with water cooled steel rolls. After this the glass film will be crushed. Due to this process frits (flakes) are formed.