1. Feeder
  • Glass too hot
  • Incorrect gob shape

 
1. Feeder
  • Adjust gob temperature
  • Reshape the gob

 
2. Machine Setup and Operation
  • Finish is not set hard enough, caused by insufficient time and/or pressure of settle blow or a dry blank, reducing the contact between glass and finish mold equipment
  • Plunger contact time is too short
  • Neck ring is too hot
  • Internal cooling tube too large, or too small exhaust hold
  • Blowhead out of alignment
  • Not enough counterblow

 
2. Machine Setup and Operation
  • Increase settle blow time and swab the blank
  • Increase the plunger contact time
  • Use the neck ring cooling nozzle
  • Use a smaller final blow tube and/or a larger exhaust hold
  • Realign the blowhead over the mold
  • Increase the counterblow

 
3. Mold Equipment
  • Blowhead is too shallow, causing contact
  • Equalizing holes blocked I blowhead
  • Neck of mold too small for parison, causing contact between blowhead and finish

 
3. Mold Equipment
  • Increase the depth of blowhead
  • Clear vent holes in blowhead
  • Check neck of mold for correct size

 

Note: It may prevent good capping of the container, which will spoil the product