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How to Keep the Heating Section in Glass Tempering Furnace Clean and Maintain Fused Silica Rolls (5)
Source : www.landglass.co    Release time:2013-07-29

c. A commonly successful roll cleaning sequence is as follows:

Wipe down all furnace and load table rolls with tack cloth.
Wipe down all furnace and load table rolls with a damp cloth.
Dry with a lint free towel and feel the roll surface with your bare hand.
If smooth, wipe down with tack cloth again and install in the glass tempering furnace.
If rough or debris is evident, proceed to Step 4.
Wash the rolls with a minimal amount of water and non-metallic abrasive pad.
Dry with a lint free towel and feel the roll surface with your bare hand.
If smooth, wipe down with tack cloth again and install in the furnace.
If rough or nodules are present, repeat Step 4 & 5 before proceeding to Step 6.
If roughness and nodules persist, use a fine grit sandpaper, file, or abrasive to clean localized spots.
Wipe down the rolls with a damp cloth or wash with a minimal amount of water.
Dry with a lint free towel and feel the roll surface with your bare hand.
If smooth, wipe down with tack cloth again and install in the furnace.

If roughness and nodules persist, repeat Step 6.

Once smooth and dry, always wipe down with tack cloth again and install in the glass tempering furnace.


Service life of the rolls is very dependent on the conditions of use as described above. To judge if a roll is still in proper conditions for use, make sure the roll surface condition is still good. A rough roll surface may significantly change the contact surface between the glass and the roll, and may generate defects. Some small pits in the roll surface may not be cause for roll rejection, but pits generally have high surface areas and are the likely position for build-up to occur.  Protrusions or build up on the roll surface are cause for roll cleaning or removal from service; as such defects will surely mark the glass. Another possible cause for roll rejection is end-cap damage or looseness. To avoid possible caps looseness, make sure the caps are not overheated due to poor condition of side seals or opening the furnace chamber when hot and exposing the end-caps to high heat radiation. Roll deformation or out-of-round eccentricity is also cause for rejection. If rolls are identified with high TIR, you can contact the roll manufacturer directly.

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