1. Feeder
  • Glass too cold
  • Foreign object on forehearth floor
  • Broken refractory in forehearth/spout
1. Feeder
  • Raise glass temperature
  • Remove the spout cover and check for foreign object
2. Machine Set-up
  • Microscopic inclusions from
    Plunger (NNPB)
  • From excessive swabbing
  • Reheat time too short (NNPB)
2. Machine Set-up
  • Change Plunger
  • Reduce the frequency of swabbing
  • Lengthen reheat time