Can anyone shed some light on a problem i am having in my lam dept.
We are getting pockets of air (bubbles) trapped in low pressure areas
towards the middle of the panel
Seen only on the top or bottom panel of each book
This only happens on cores with 2-3 oz cu.

So far we have tried
heat rise 12 -16 F /min
b-stage with more resin- we are using 7628 only
vacume assist press and hydrolic
low pressure vs high
no kiss cycle
flatness of plates
not able to modify the pettern

  thank you for any suggestions

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