Talk Composites - The Forum for Advanced Composites

Resin infusion, help evaluating the result.

http://www.talkcomposites.com/Topic20749.aspx

By Ronny - 3/7/2016 12:28:50 PM

Hi
The more i read the more i get confused about the proper way to infuse.
EC tutorial says as soon as resin has reached the catchpot you should shut off the resin feed and 10 seconds later shut off the resin exit.

After doing this i noticed lots of airbubbles in the mould, and both resin inlet and exit hose was "bubbling" with air.
I had full vacuum -30 when i shut the lines, and the morning after the gauge read -28, so there was a tiny leak somewhere.
(maybe because of changes in the room temperature?)

Anyways the results are seen here:
http://imgur.com/Q3HyxCr
http://imgur.com/aUaG0MA

Looks to me as its resin starved, and the bubbles i observed in the mould during cure has probably caused alot of problems.
Should i leave the resinfeed on for a longer time? til i only observe pure resin and no air in the resin exit?
Any other advice?

Layers were 4x220g, peel-ply and infusion mesh.

Also after peeling of the peel-ply it leaves a really "dry" surface, is this surface strong or should i coat it with a layer of resin?
Strengt is the primary concern on this part, not looks.
http://imgur.com/1hlbns1
By Hanaldo - 3/8/2016 12:42:32 AM

davro (07/03/2016)
I have started using a resin break in the gap just before the outlet line/s (gap in the infusion mesh) and this helps a lot.

I'm going to experiment putting a small piece of breather cloth in the resin break next time, as some times I find having a complete break slow things down to much anyone experimented with something like this ?


Probably won't work the way you are expecting. I often use breather to really choke the resin, as the breather will want to be completely wet out before the resin enters the vac line. 

Peel ply break is the norm and works well.