The flat glass industry has long sought for the ability to clean the surface of stainless steel lehr rollers...in place...in the lehr...while the lehr is operating. The removal of rollers from the lehr for cleaning is dangerous, expensive and very disruptive.
Sodium sulfate, tin sulfate and tin oxide are common lehr roller surface deposits. The introduction of sulfur dioxide gas into the lehr reduces and may eliminate many bottom side effects. However, continuous or heavy sulfur dioxide usage will generate deposits on the rollers. In addition, tin upsets and tin bath lip problems can cause tin and tin oxides to track down the roller bed. Surface deposits on the lehr rollers can cause an increase in "roller marks" and optical distortion issues with the ribbon.
The cleaning head is introduced into the lehr through the lehr sidewall panels between two lehr rolls. Both rollers are cleaned at the same time. The machine has now successfully cleaned several hundred rollers while operating at temperatures found in A and B zones.
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