1. Feeder
  • Furnace pull is too high
  • Furnace temperatures too low
  • Glass composition out of control
  • The atmosphere in the rear of the furnace contains carbon monoxide (CO)

 
1. Feeder
  • Adjust air/gas mixture in the forehearth to give "flameless" combustion

 

Note: This defect cannot always be remedied by the production personnel.