1. Feeder
  • Shears not cutting correctly

 
1. Feeder
  • Correct the shear cut

 
2. Machine Setup and Operation
  • Neck ring and plunger are being swabbed too much
  • Excessive sulfur powder on the neck ring
  • Swab is dirty or made of incorrect material
  • Excessive oil spray on finish equipment
  • Wrong grade of lubricant on delivery equipment
  • Neck ring running too hot, causing scaling of the material
  • Plunger running too cold

 
2. Machine Setup and Operation
  • Change plunger and neck ring
  • Change neck ring
  • Use a clean swab of correct shape
  • Reduce the oil spray
  • Use the correct grade of lubrication oil on delivery equipment
  • Use neck ring cooling nozzle

 
3. Mold Equipment
  • Wrong grade of mold material used
  • Poor surface on the finish equipment
  • Neck ring size too small (running too hot)
3. Mold Equipment
  • Use better grade mold material
  • Improve polishing of mold and neck ring
  • Use a larger size neck ring

 

Note: If it is badly pitted, it will cause sealing problems on the filling line