PROCEDE POUR AMELIORER LE PROFIL THERMIQUE DES FOURS DE VERRE ET FOUR DE FUSION DE VERRE POUR SA MISE EN OEUVRE

摘要

A solid glass charge is introduced in the upper part of a furnace in a charging zone in which is also located a zone for the evacuation of fumes. There is a melting zone in the centre of the furnace, heated by at least one burner and a refining zone in which the glass charge is brought to a desired temperature and viscosity before leaving the furnace in a channel feeding some glass forming machines. The energy provided to the glass in the charging zone is between 5-40% of the total energy provided to the glass in the furnace. The energy provided to the glass in the furnace is regularly distributed over the whole length of the furnace in a manner that avoids a vault temperature at the hot point of the furnace passing beyond about 1620 degrees C, preferably ca. 1590 degrees C, whilst maintaining a temperature at least equal to 1430 degrees C in the charging zone and measured in the vault of the furnace.