Discontinuous Glass Production
- Pot Furnaces
- Daily Furnaces
- Electrical Furnaces
In the pot furnace takes the melting place in separate periods, so-called harbours. The harbour is a heat-resistant container in which the glass melts with capacities of 250 –max.1000 kg of glass. The glass is melted, fined, homogenized and subsequently cooled down to the working temperature to allow forming mainly by the craftsman taking portions of glass from the glass melt pot with cyle times between 18 and 24 hours. The combustion air preheating is done via recuperator. Multiple pot solutions are used in bigger plants.
Day tank furnace
The day tank furnaces work discontiniously, are manly used for the production of clear or coloured glass and are heated with an air preheating recuperator installed on the combustion air circuit. The output of these furnaces can be in the range 250 - 3,000 kg/day of glass. Both pot furnaces and daily furnaces produce mainly artistic glass products.
Electric melters receive most of the energy for glass melting through electrical heating. Electric current is passed through the glass by means of electrodes. Because of the electrical resistance of the glass, the glass is heated by Joulean heating. Electrodes are made of molybdenum, tin oxide, platinum, graphite or iron.