wet laying carbon fibre into mould - bubbles and gaps!


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8900120d
8900120d
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Hi guys,
im new to composites and ive been experimenting with carbon fibre but i just cant get it right.
The plug consists of several edges close to each other

here is what i have done so far:
1) made a mould using 14pa tooling gelcoat, 491pa ISO polyester resin, and 3 layers of 200g fibreglass, the mould came out perfectly!
2) sanded down the mould and cleaned it using Easy Lease mould cleaner
3) 1 coat of PVA release agent with brush 
4) 1 coat of EL2 Epoxy Laminating Resin + FAST hardener - wait for it to become tacky 2-4 hours
5) Lay the first layer of carbon fibre (200g 2x2) - IT WAS EXTREMELY HARD TO MAKE THE CARBON FIBRE STICK TO THE EDGES WITHOUT LIFTING OFF Sad
6) second coat of EL2 Epoxy Laminating Resin + FAST hardener
7) Lay second layer of carbon fibre - SECOND LAYER OF CARBON FIBRE MADE IT EVEN HARDER TO MAKE IT STICK TO THE EDGES WITHOUT LIFTING OFF!
8) repeat step 6+7 for third layer of carbon fibre
9) release the part after 24h 

as you can see from the pictures, the part has loads of lifts (bubbles) is there anything im doing wrong? 


  



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oekmont
oekmont
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1) as for any other process: a polished mould gives the best results. If you want a glossy part, of course.
2) none
3)yes
4)very important. I would think about a method of getting a tempered place, before starting anything with epoxy.

8900120d
8900120d
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oekmont - 2/28/2019 12:27:09 PM
1) as for any other process: a polished mould gives the best results. If you want a glossy part, of course.
2) none
3)yes
4)very important. I would think about a method of getting a tempered place, before starting anything with epoxy.

thanks for your response, any reason as to why youd recommend easy lease release agent over PVA?

Fasta
Fasta
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8900120d - 2/28/2019 12:37:35 PM
oekmont - 2/28/2019 12:27:09 PM
1) as for any other process: a polished mould gives the best results. If you want a glossy part, of course.
2) none
3)yes
4)very important. I would think about a method of getting a tempered place, before starting anything with epoxy.

thanks for your response, any reason as to why youd recommend easy lease release agent over PVA?

Maybe easy lease alone or you can likely add a regular wax on top of the easy lease too? (this is my method and works so far works with Frekote or Zyvax). 
For infusion you might want to actually spray a very light mist of a spray tack like aerofix to hold the layers all in place as with such small mould details the carbon will be springing out of the shape too and may not go back into the shape even with the vacuum? 
If you have a pva on the mould you will not be able to spray tack the layer to the mould surface as the carbon and spray glue could pull the pva off and make a mess of your final part surface?





Edited 6 Years Ago by Fasta
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