Talk Composites - The Forum for Advanced Composites
Back
Login
Register
Login
Register
Home
»
Advanced Composites Forum
»
Resin Infusion
»
Could need some advice on flow front
Could need some advice on flow front
Post Reply
Like
5
Could need some advice on flow front
View
Flat Ascending
Flat Descending
Threaded
Options
Subscribe to topic
Print This Topic
Goto Topics Forum
Author
Message
gnidnu
gnidnu
posted 10 Years Ago
ANSWER
HOT
Topic Details
Group: Forum Members
Posts: 2,
Visits: 193
I'm having trouble with this partly double sided infusion. This was the most recent try. Layup:
(Mould Side)
200 g/m² Glass Twill Weave
300 g/m² Carbon Biaxial +-45°
300 g/m² Glass Biaxial +-45°
400 g/m² Glass Unidirectional 0°
10 mm Gurit Corecell M80 Foam, Perforation Grid 2mm / 20 mm
300 g/m² Glass Biaxial +-45°
200 g/m² Carbon Unidirectional 0°
200 g/m² Carbon Unidirectional 0°
300 g/m² Carbon Biaxial +-45°
160 g/m² Carbon Twill Weave
78 g/m² Glass Twill Weave
MTI hose on left side, feed line on the right.
Can't measure absolute pressure, but relative pressure was -0,93 Bar.
Resin was degassed until no more bubbles were visible.
Didn't turn out well. It looks like the flow front on the A side was significantly slower than on top, which resulted in complete dry spots.
Do you have any advice on what to do differently next time? I already tried infusing from back to front instead of left to right, which turned out better.
Attachments
IMG_20150104_170946-1.jpg
(
678 views,
177.00 KB
)
Edited
10 Years Ago by
gnidnu
Reply
Like
5
Reply
petereng
petereng
posted 10 Years Ago
ANSWER
Post Details
Group: Forum Members
Posts: 2,
Visits: 4
Hi- 1000gsm is not very thick. Some years ago I was working on mast laminates of 25-30mm thick of carbon infused. Thats thick. So 1) the big problem with carbon is that the UDs often don't infuse well. But it seems some of yours does so maybe another problem. If you hold the UD up to the light can you see through it? If not probably not the right UD for infusion. Check with your supplier and ensure the UD you have or going to have is being infused by someone 2) Dry spots are lack of vacuum.. was the 0.93 bar in the bag at the furthest part away from the vac side of the job? or at the pump? Then vacuum decreases through the fill due to outgassing (which if you degassed right won't happen). The advice about slowing down the fill is very good. Clamp the inlet so it flows quite slow, allowing the bottom and top to fill together. Plus use a slow medium. And lastly did you have enough resin? Did you have resin left in the pot and lines?
Plus if you fill on a slight angle say 10degs uphill this will help scavenge any gasses to the pump via the MTI tube. The dry spot maybe water vapour so leave your job under vacuum for say 1 hr to remove steam form the job. By vacuum soak I mean under vacuum pump. Some people turn the pump off which means gasses or water vapour can't be transported out of the bag.
cheers Peter
Tags
carbon
infusion
vacuum
Reply
Like
1
GO
Merge Selected
Merge into selected topic...
Merge into merge target...
Merge into a specific topic ID...
Open Merge
Threaded View
Threaded View
Could need some advice on flow front
gnidnu
-
10 Years Ago
Yeh that's a hugely thick laminate for infusion, especially when it is 95% uni. You would need to...
Hanaldo
-
10 Years Ago
As above, that's a large stack to be working with, slow the resin right down and give it a chance to...
ajb100
-
10 Years Ago
As mentioned, that's quite a thick stack, slow that sucker down. Do a test infusion, the same...
ChrisR
-
10 Years Ago
As already said, UD and the overall thickness is slowing things down. The core will also slow things...
Warren (Staff)
-
10 Years Ago
Thank you all so much for your replies, really appreciate your advice. :)
gnidnu
-
10 Years Ago
Jeez, and here I am tossing up between cutting my fabric at 600mm and risking not covering the...
Hanaldo
-
10 Years Ago
Maybe I can help as I've just been infusing a chair core which is a 7mm hit in one go (650 gms CF...
deagrateful
-
10 Years Ago
3 hours!? How long is your pot life??
Hanaldo
-
10 Years Ago
Nearly 10 KG of resin goes into the part. 2/3 of this is infused fairly quickly and then a second...
deagrateful
-
10 Years Ago
Hi- 1000gsm is not very thick. Some years ago I was working on mast laminates of 25-30mm thick of...
petereng
-
10 Years Ago
Post Reply
Like
5
Similar Topics
Post Quoted Reply
Reading This Topic
Login
Login
Remember Me
Reset Password
Resend Validation Email
Login
Facebook
Google
Explore
Messages
Mentions
Search