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Incomplete Forming Print

Problem:

Incomplete Forming

Possible Cause:

(1) Sheet is cold
(2) Insufficient vacuum
(3) Vacuum not drawn fast enough
(4) Part ratio too large

Suggested Course of Action:

  • Increase heating time
  • Increase heater temperature
  • Increase heater watt density
  • Increase heating uniformity
  • Bring heater closer to clamped sheet
  • Check for clogged vacuum holes (test with PE film)
  • Increase number of vacuum holes
  • Relocate vacuum holes
  • Increase size of vacuum holes
  • Check vacuum system for leakage
  • Check vacuum system design as meeting required evacuation rate
  • Increase size of vacuum holes
  • Increase vacuum pump capacity
  • Add plug/pressure assist