1. Machine Setup and Operation
  • Too much cooling on the blank mold
  • Buildup of carbon on neck of the blank due to excessive swabbing
  • Dirty swab
  • Swabbing compound too thick
  • Swab made of incorrect material and wrong shape
  • Wrong grade of mold lubricant
  • Excessive oil on the delivery equipment

 

1. Machine Setup and Operation
  • Reduce the blank cooling
  • Change blank
  • Use a new clean swab of correct shape
  • Use a correct grade swabbing compound
  • Use a swab made form cotton
  • Use correct grade of mold lubricant
  • Fit drip plan to deflector

 

2. Mold Equipment
  • Poor surface of blank cavity

 

2. Mold Equipment
  • Improve polish on mold equipment surfaces