I have a question for you mike if thats ok? When you have a perfect infusion do you see any bubbles that appear to get trapped in the weave of the cloth? I have found on mine that when i get a really good one i hardley see any bubbles in the back but.... if i get any bubbles that appear in the...
Thanks for this mike. I thought i had got the process sorted untill i tried to make a carbon bonnet vent in my new mould. It came out sub standard. But when i was doing the flat sheet i was sort of doing what you had just described. On my new mould i have about a 5 inch flange around the part...
I found another thing that makes my test parts perfect quality... If i squeegee the part (flat test panel) i can see the air being removed from the part. Then it comes out perfect. However if i leave it to do it on its own the air seems to get trapped by the resin and will not move out the part...
moto mike.
To answer to your prevoius post, i have tried degassing and not degassing and it always comes out the same.
Its not so much tiny bubbles but voids inbetween the tows in the weave as if the resin is being sucked from the gaps. Hence the reason i am testing dropping the pressure...
moto mike.
What size was the part you did the test on? And how many layers did you use?
I think it has something to do with the size of the part. And pulling full vac.
I have just set a piece going, and infused at full vac but just as it has infused i reduced the vacuum to 21hg in's.
I...
Moto mike.
The pot life is around 90 mins.
Gel time is around 5-6 hours at roughly 20-25 Degrees c.
It is epoxy resin specifically designed for infusion.
I'm sure we will get it sorted soon. I think there is much more to it than i thought. But i never quit...so ill keep trying untill i get...
Motomike,
Yes thats exactly what happened yesterday the resin creeped into the vacuum line (i have a catch pot with a guage), i thought it was odd when i saw the resin fall back down the vacuum tube then rise again then as soon as a drip went into the pot it fell again. I have set another one...
Thank you moto mike, i think i am having the same problems as you were having. I have been trying for about four months now too. I have never tried a breather layer around the perimiter so i will definety try that. (what would the purpose for this be though)?
I do indeed butyl tape the bag to...
Got a question.... i read a post on the net saying that some bagging plastic can be too stretchy for infusion, therefore filling the flow media/ laminate with 'bag' where the air would normally flow through thus restricting air flow. Does this sound like it could happen??
Regards, chris.
The method was probably not sufficient really. I pulled as much vac as possible and closed the 1/4 turn valve. Then turned the pump off. I left it for about 3 hours and when i returned the bag was as tight as it was when i left it. But i guess i should probably stick a guage on it so i can see...
ok, test done and out of resin untill the weekend. The results were average. Roughly the same as last time.
If i am acheiving full vacuum (lets say i am for the purpose of this question), even on a part as small as 8x6 inch's, should i leave the stack for any longer than a couple of minutes to...
Thank you very much to you both for your support. I will put some of your points together tonight when i carry out another test piece ( then i will be out of resin untill saturday). I will let you know how i get on. I will try infusing at full vac (or as full as i can achieve with no proper...
I dont know whether this would be the same thing but i tend to only have a small amount of infusion mesh (flow media) then just the laminate/ peel ply. As soon as the resin hits the laminate without the mesh it slows down(i am only making pieces around 6 inch's by 8 inch's).
I have also tried...
Thank you for helping compositepro. Your the first person to give me something to go on. I have tried infusing at 'full' vac then dropping to 15inHG, in this case the void content was dramatically reduced however the resin was so thin over the finished part that some fibre was visible outside...
Please help me before i go insane... After every infusion i do (practcing on glass using carbon fibre and plain weave e glass) There are small gaps between every tow in the weave. I have tried everything i can think of to stop this. I am using carbon that is stored in bubble wrap, epoxy infusion...
