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How to Keep the Heating Section in Glass Tempering Furnace Clean and Maintain Fused Silica Rolls (4)
Source :    Release time:2013-07-26

B. Roll Cleaning and Maintenance

a. The frequency of glass tempering furnace and rolls maintenance. 

Roll cleaning is ideally done as a preventive maintenance measure. Cleaning periodicity will also depend on glass quality requirements, glass thickness and level of SO2 usage. It may typically vary from 4 to 8 weeks to up to 6 months. 

It needs more frequent furnace maintenance and roll cleaning when heavy architectural glass is often produced and at times extended SO2 usage both during start-up and during furnace operation. 

b. How to clean rolls. 

The ceramic rolls should only be washed with water, preferentially demineralized water.  Never use detergents. Detergents will chemically react with the rolls, resulting in devitrification and roll failure. Due to their extremely low coefficient of thermal expansion, the rolls can be washed hot. Glass debris on the rolls surface can be thermally shocked off  the rolls when cold water is applied to a hot roll. Precautions should be taken to prevent the end-caps from getting hot during the cleaning process. Rolls can also be cleaned effectively at room temperature. 

The rolls should be dried following cleaning. If the rolls are soaked with water and heated too quickly, steam may develop in the roll and cause it to fail. 

Deposits on the roll surface usually consist of Sodium Sulfate, and may include other elements from the glass, or dust and debris from glass, the furnace lining, or other sources. 

Water and a non-metallic abrasive pad are usually sufficient to wash the rolls and to remove build-up. After washing the surface, some hard spots may remain.  It is suggested that only then sandpaper may be used to remove these spots.  A very fine sand paper, typically 600/800 grit should be used. Sanding roll surface should be avoided if possible. Sanding may induce waves or an out-of-round condition to the rolls. Sanding the rolls may also affect the surface finish, and lead to a faster rate of build-up or nodule formation where the roll was sanded. If sanding is required, take great care and be absolutely certain to avoid introducing the dust in the furnace environment.  Rolls must be washed again after sanding. Wipe the rolls down with a damp cloth, avoiding large volumes of water.  Water will carry microscopic dust particles into the pores of the rolls where they become trapped until the roll is heated and they can migrate to the surface.  This microscopic dust is often the cause for a white haze condition during restart of the furnace.  After washing, a final wipe down using tack cloth is recommended to remove dust from roll surface.

The frequency of how often rolls should be cleaned varies greatly and is usually determined by cleanliness of furnace environment. The plant environment, furnace cleanliness, fabricating practices, glass cleanliness, SO2 usage, etc. will influence roll cleanliness and frequency of roll cleaning. 

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