Tunnel furnace

C - Chemistry – Metallurgy – 03 – B

Patent

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Details

C03B 19/08 (2006.01) C03B 3/02 (2006.01) C03C 11/00 (2006.01)

Patent

CA 2629518

Tunnel furnace for foaming glass material, comprising heating elements chosen among electrical and gas based heating elements. The tunnel furnace comprises at least the following temperature zones: a preheating zone (8) suitable for heating the feed material to a temperature in the range 400 - 900 ~C and a foaming zone (9) suitable for heating the glass material to a temperature above 900 ~C. The furnace also typically comprises a cooling zone (10) suitable for reducing the temperature from the elevated temperature in the foaming zone. According to the present invention the preheating zone (8) is at least 15 % longer than the foaming zone (9).

L~invention concerne un four tunnel pour le moussage de matériau à base de verre, ledit four comprenant des éléments de chauffage choisis parmi des éléments de chauffage électriques et au gaz. Le four tunnel comprend au moins les zones de température suivantes : - une zone de préchauffage (8) convenant au chauffage des substances de base à une température comprise entre 400 et 900 °C et une zone de moussage (9) convenant au chauffage du matériau à base de verre à une température supérieure à 900 °C. Le four comprend également généralement une zone de refroidissement (10) convenant à la réduction de la température élevée de la zone de moussage. Selon la présente invention, la zone de préchauffage (8) est au moins 15 % plus longue que la zone de moussage (9).

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