C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
307/3
C03B 5/02 (2006.01) C03B 5/03 (2006.01) C03B 7/07 (2006.01) H05B 3/00 (2006.01)
Patent
CA 1144966
14938 ELECTRIC FOREHEARTH ABSTRACT OF THE DISCLOSURE Disclosed is a method and apparatus for preventing the formation of blisters in an electrically-heated fore- hearth that utilizes submerged electrodes connected to either a single or plural phase alternating current source. The electrodes are arranged so that Joule effect heating is effected by passing alternating current through the molten glass with the center tap of the secondary of the power trans- former being connected to the positive side of a Direct Current source through a filter, while the negative side of the DC source is connected to a counter electrode, immersed in the glass at a point upstream of the forehearth. With this physical arrangement, the formation of blisters due to free electrons migrating to and collecting on some of the electrodes that are at different potentials than the others is prevented. This is accomplished by the fact that all of the forehearth electrodes are maintained at the same potential and the counter electrode is at a different potential so that these free electrons will collect at the single counter electrode and create bubbles or blisters at a position well in advance of the forehearth. With this system, the blisters will disappear before reaching the fore- hearth. The forehearth electrodes are disclosed as being formed of stainless steel with molybdenum tips and the elect- rode support being electrically isolated from the forehearth structure.
351961
Hornyak Emery J. Jr.
Perry Philip D.
Sherman James E.
Gowling Lafleur Henderson Llp
Owens-Illinois Inc.
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