Talk Composites - The Forum for Advanced Composites

Cause of print through?

http://www.talkcomposites.com/Topic40429.aspx

By AlpineCoupe - 5/10/2022 4:23:34 PM

I was testing a bit with different cores and layers of carbon under the core and one of my friends asked me what causes the core to print through to the carbon. And I honestly don't know the cause. This was Lantor Soric core in the example below.

I know and expect that it happens when using only a single layer... but the why is a mystery to me. Is it just that the core compresses more than the carbon under vacuum and moves the weave a little bit?
Pic for an example:
By Hanaldo - 5/28/2022 12:34:46 AM

 
Lester Populaire - 5/12/2022 7:41:41 AM
The most effective way to reduce print through would probably be to infuse the first layer individually, let it cure, super carefully rip off the peel ply and then continue with the rest of the layup. It's just a big waste of consumables and you still need to be careful about the rest of the stack.

And it isn't actually all that effective at reducing print, it will still print through as the part ages. It's definitely the way to go if weight is the ultimate priority, but if cosmetics are the top priority then the most effective way is definitely to make the laminate thicker on the mould side, and bulk out the laminate at the edges of the core.