Q. Compare pot furnace and tank furnace used in manufacture of glass.
Ans.
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S.NO.
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Pot furnace
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Tank furnace
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1.
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Used for special glasses, optical glasses, art glass and plate glass etc.
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Used for large scale production, such as common glasses
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2.
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As pots in pot furnace can be stirred, a great uniformly, as is required in optical glass, is achieved.
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Stirring is not possible
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3.
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As pots are closed, glass melt is completely protected from combustion products impurities as required for special glasses.
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Not completely protected so special glass cannot be obtained
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4.
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Process is discontinuous. Shaping of the articles from glass melt is done at temperature somewhat lower than fusion temperature.
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Process is continuous. The charging, melting and for shaping is carried out simultaneously a temperature is maintained.
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