Could need some advice on flow front

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Could need some advice on flow front

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gnidnu	gnidnu posted 10 Years Ago 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
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ChrisR	ChrisR posted 10 Years Ago HOT Post Details
Group: Forum Members Posts: 363, Visits: 3K	As mentioned, that's quite a thick stack, slow that sucker down. Do a test infusion, the same stack, the same length but less width, lay up on a sheet of glass so you can see the mould side during the infusion. During the infusion mark the top and bottom with a marker pen every few seconds, that way you can see how the resin is flowing afterwards. For a stack that thick with so many layers I'd think you'd need to keep the vac on before infusing for at least an hour to make sure all the air is fully removed. I've not used MTI but have read loads about it, I think in your case you need to loose it and work on the inlet/outlet positions using regular methods i.e. stopping the mesh before the outlet, just having peelply. I have seen at a demonstration a 25thk solid layup laminate infused without MTI. edit: just looked at the attachment, sorry but WOW thats a really massive waste of materials for such as small finished product! I thought the whole mould was the finished item! Edited 10 Years Ago by ChrisR
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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

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Could need some advice on flow front

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