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ARSOUILLERB26
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hi Firstly thank you very much for all your helpful answers !! For the carbon tray, I pulled at full vaccum (-1bar) but unfortunately I had tiny bubbles but only on the edges of the part, I don't know why, I remember the vaccum was total... For the carbon tray, I remember I had bubbles in the infusion mesh next to the vaccum connector when I was obliged to clamp but why ? :-/ But I don't see why you talk about 3 layers of infusion mesh, I putted only 2 layers (the principal and an additional on the end of the infusion next to the pump connector) To be sure I understood, I wait for the resin had totally infused the part, once the resin starts going to the catch pot, I clamp the feeding line, and 30 second after I clamp the vaccum line, isn't it? For repairing this bubbles, I tried a bi composent lacquer but it smoothed itself very bad: I had very little retraction everywhere :-( (if you know a perfect product, it could be different) So, except the lacquer, it rest the varnish or an additionnal layer of resin (glazing), I imagine with infusion resin which is more fluid to fill the bubbles but I suppose it will need sanding just after... so I think I necessarily will need varnish to have a gloss finish (especially for the part which was in contact with the peel ply) Thanks Matt for the 45° possibility to increase the deflection strength but it will be difficult to avoid carbon losses with that way, I thing I gonna use sonic material, but with this material, because the infusion is made my inside, the both side have aspect like peel ply side isn't it? Warren, very nice plate, I had the idea but I didn't dared because I was affraid to detroy it with the knife, it s seem not be a problem for you ^^
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Kevin-Lee
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Go see: https://www.easycomposites.co.uk/resin-infusion-starter-kit#video04:45. Step 8. Add an additional 2 EXTRA layers of infusion mesh on top of the original infusion mesh... 11:25. Step 20. Degas for 10 min... 12:50. Step 23. Clamp feed line once resin reaches the catch pot... (let it drip into the cup for 2 or 3 seconds) 13:00. Step 24. Wait 10 seconds and then clamp the vac line... These are the steps that I think will help you a bit more. Take note of the size of the mold/part in the video, I would say about 800mm x 800mm, Matt only "bleeds" the resin for about 10 seconds... I would say your tray was about 550mm x 400mm and if you "bleed" it for 30 seconds it could come out a bit dry. I have also noticed that different weaves/twill/materials/cores/part sizes all have different infusion and bleed times and it can be tricky... Does the top of your tray face the peel ply and infusion mesh?
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Warren
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The bubbles have to be coming from somewhere. Have you done the leak drop test properly? perhaps for several hours even?
As suggested degas the resin. ( You can do it in the catch pot with the mould under vacuum sealed by a clamp. Just increase vac slowly over a couple minutes so it doesnt froth).
Also try throttling the resin feed with a line clamp to slow the infusion down a bit, maybe its just too quick at the moment.
As has been said, it should be possible for you to achieve a pinhole free finish with infusion when done correctly and there is no technical reason i can see that a mostly flat tray should be any different.
With soric you will still have a smooth side like normal.
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ARSOUILLERB26
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Okay thank you,  I gonna try an other infusion for applying all yours advices soon... blue carbon tray incoming ^^ (my only mould at this time) I'll give you news... wait and see  ps: sorry kevin I don t understand your question: Does the top of your tray face the peel ply and infusion mesh?
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Warren
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what kevin means is which side of your tray is the "shiney" side.
Just take it slow and steady.
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Joe
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Hi, Arsouille. Well I think i'll be jealous again then. Good luck for your project.
 A $1000 electronic device will always protect a 10 cents fuse
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ARSOUILLERB26
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Group: Forum Members
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Hi kevin, the peel ply side is the inferior, the glossy superior side is the gel coat side  So my new blue carbon tray infusion is done following your instructions. I tested the vacuum 2 days long, I had a little air leak of 0.01 bar max in 4hours, that I hope I have been able to fill. I have done 50% fast harderer / 50% slow to accelerate the process and limit the damages if I didn't. He's composed of 2 layers of bleu carbon for the exterior and 2 Fiber glass layers for the reinforcement. The infusion looked good, the resin was degassed on open air but when the resin has reached the catch pot, il remained bubbles visibles on the infusion mesh... so instead of the recommended 2/3 seconds, I waited a little more (I had a lot of resin mixed by security so I could) but when I've cut the feed line andd just then (5/10sec) the vacuum line, it still remained bubbles in the infusion mesh (mooving in vacuum direction, not stoped) I precise... is it normal? Would I expect that the infusion mesh was free of any bubble? When, once demoulded, I still have bubbles, only on the edges but really smaller and fewer at earlier. Most of them are not in the final part but in the losses. I had the impression to have well pressed the infusion mesh on the edge so I think i m on the good way but a little more help will be welcome. I finish with the pictures (as you ll see, the tray is not cutted yet) |
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Joe
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Muhaha it looks awesome, especially in the sun. With the summer coming, it will definitely be a very good match to a glass of Ricard, isn't it? Santé, Arsouille  : P'tit Jaune +  +  = 
A $1000 electronic device will always protect a 10 cents fuse
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Matt (Staff)
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Hi Arsouille,
That really is getting to be a very high quality looking product. I think yours are the first photos that I've seen of an infusion using the coloured fabric and I'm amazed how great the weave looks. The coloured fabrics (a bit like carbon/kevlar hybrids) usually show weave distortion much more obviously but the weave looks incredible. Great work putting that in so neat. I guess being a fairly flat shape helps a lot with that.
I'm still slightly puzzled by the air bubbles. They really are looking *tiny* now. Do they exist only at one side of the infusion (I can see that they're mainly at the very edge and in the main part they're past the 'trim line' but are they ocurring mainly at the vacuum end of the project? - If so then it might be (in your case) worth purging considerably more resin through. That is to say leave both the vacuum line and the resin line open quite a while after the resin has reached the vacuum line at the other side. If it's the resin at the 'front' of the advance that's harbouring the bubbles then purging it through (into the catch-pot or at least the vac line) might get rid of the problem. Once you've purged through in the manner you'll need to clamp of the resin line and then let the vac line pull down for a little longer to get some of the excess resin out of the laminate.
I hope this helps but the problem still must be being caused by something else that I'd love to get to the bottom of for you allthough it seems to be escaping all of us at the moment. Infusion projects that we do at EC (and Carbon Mods) really don't display any air bubbles like this so it certainly can be done!
All the best, Matt
Matt Statham
Easy Composites / Carbon Mods - Technical Sales
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Joe
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Isn't it air from the resin? Maybe a "cold" resin from which bubbles would have difficulties to flow out? This question, because if the bag is not leaking, air comes from the resin, in my opinion.
A $1000 electronic device will always protect a 10 cents fuse
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