1. Feeder
  • Glass temperature too low
  • Point of gob chilled
  • Wrong gob shape - usually too long
  • Excessive shear spray

 
1. Feeder
  • Adjust temperature of the glass
  • Increase lifting action of plunger
  • Correct gob shape
  • Reduce shear spray

 
2. Machine Setup and Operation
  • Poor delivery
  • Excessive scoop cooling
  • Inadequate lubrication of delivery equipment
  • Misalignment of delivery equipment

 
2. Machine Setup and Operation
  • Improve delivery of gob
  • Reduce scoop cooling air
  • Improve lubricating of delivery equipment
  • Realign delivery equipment

 
3. Mold Equipment
  • Funnel diameter too small - gob hangs up
  • Incorrect blank design
3. Mold Equipment
  • Increase funnel diameter
  • Correct blank design