Delamination while Compression molding of Carbon phenolic

[ARS-Godrej]

Hi
I need a dia 80 solid piece of compression molded Carbon phenolic composite
I an Tool I did lay-up of disc shaped pre-preg and put the tool on Ht platen press and cured at 155 degree temperature and cured for 4 hrs.
Post de molding the part splitted in to 2 to 3 pieces. Pl. find image attached

What could be the reason and how to overcome this kindly advice?

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/raw/upload/v1597043536/tips/Image_gggzof.pptx[/url]

 

[Compositepro]

Post details of your mold and molding procedure. Phenolic resin releases moisture during cure, which strongly interacts with trapped air. Air tends to get trapped in the center as heat transfers into the part from the mold walls.

Bumping the mold open momentarily after the part has warmed-up but before it gels is often effective. How much resin bleed is occurring (determined by change in resin content during cure).