Package Cost Reduction Strategies Q&A
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Asked October 26th, 2010
Bubbles that are seen during the forming process are typically created by either excessive heat being applied during the preheat cycle or trapped air between the heating plate and the material.
The solution for the excess heat scenario is to use multiple heating stages and bring the temperature of the material up to the required set point slowly and consistently.
The trapped air can be eliminated by using vacuum assist to pull the material onto the heating plates as well as air pressure to press the material simultaneously. Also using the appropriate coating on the heating surfaces influences the amount of residual air that is trapped.



