Blisters or Bubbles
(1) Overheating/heating sheet
(2) Excessive moisture
Suggested Course of Action:
- Lower the heat temperatures or reduce the top too rapidly heater temperature/increase the bottom heater temperatures if using sandwich heaters.
- Increase the distance of heater from the clamped sheet.
- Pre-dry the sheet
- Pre-heat sheet
- Use sandwich heaters (heat on both sides)
- Do not remove the sheet material from moisture-proof wrap until ready to use (re-wrap when not in use)