By Dentex - 3/25/2021 5:27:51 PM
Hy guys.
I work on a project that requires wraping wooden tapered ellipsoid object in 2 layers of carbon fiber. Carbon is added for stiffness and visual appearence so nice layup is must.
Carbon goes from bottom of part and goes on sides, it doesnt go all the way around.
I have to use wet layup method combined with vacuum so my plan is to:
1. Cover wood with black tinted epoxy
2. Wait for tacky stage and add first layer
3. Add resin to saturate fabric
4. Wait for tacky stage to add other layer
5. Add resin to saturate fabric
6. Place peel ply and breather and use around 20% vacuum to remove excess resin
My questions are:
1. Will 20% vacuum remove excess resin since most of resin reached tacky or beyond tacky stage?
2. Is there anything to change in the process to ensure good bond and appearance?
3. Process is like skinning with carbon only using 2 layers instead of one and using vacuum to remove excess resin. Should I do like plan above or should I do 1 layer, wait it to cure, key whole surface and repeat process for 2nd layer?
Thanks 
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By Fasta - 4/1/2021 1:42:17 AM
You won't be able to simply wrap that with tapes due to the concave area on the bottom as tapes of any kind would bridge across the hollow area and create no pressure to hold things down.
Here is another variation on it.
Lay a single clean piece of perforated release film over the wet carbon and then fill/overfill the hollow section on the bottom with a compressible material like a firm foam that is cut just right to sit within the hollow area, then wrap as said with an overlapped tape as mentioned before compressing the foam just enough and you would then have a nice pressure all over without resorting to vacuum methods.
Vacuum bagging may also work but you would have to be pretty good at getting things just right, pulling the bag tight around the part etc.
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