Still having voids after several attempts


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Hanaldo
Hanaldo
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Great stuff, looks like a good result! 
syahnoo84
syahnoo84
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Hello,

So i'm doing another infusion, and for this time, i make the part resin rich, just like the suggestion from Hanaldo.

And voila!

The void is gone!

Thank you all!

http://www.talkcomposites.com/Uploads/Images/783905fe-d1ed-4fb9-aa61-3145.PNG
fgayford
fgayford
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Hello
I would make 3 suggestions.
1 make sure your mold is very warm
2 make sure your resin is very warm
3 Do not let the infusion front go at full speed or it may skip over parts as I see in your picture.
open the feed line only enough to get the resin front moving at a slower feed which will allow the wetting process more time to fill every void.
Hope this helps.
Fred   
syahnoo84
syahnoo84
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ah, 1 quick question. how do you fix this kind of void to perfection? do i need to have another layer of laminating epoxy covering the surface or just enough with clear coats?
Edited 10 Years Ago by syahnoo84
syahnoo84
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hanaldo, thanks for the advise. i will update once i done another infusion. 
Hanaldo
Hanaldo
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Yep, see if your part is roughly 1sqm then that is no where near enough resin. The flow mesh itself needs 700g per sqm. Your part won't be 1sqm, it's a bit smaller than that, so that's why your results are close but still a touch dry. 

To calculate your resin requirements, Paul has described a very good equation you can use:

syahnoo84
syahnoo84
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i'm using just one layer of cf cloth. i figure out the exact weight of the cloth after i trimmed the edge. in this case, its 500 gram. And i prepare the resin about 700 gram. If this is not enough, can you guys share how do you calculate the resin?
Hanaldo
Hanaldo
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Air in the resin should only cause pin holes, this is totally dry. 
VVS
VVS
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Could this be from not degassing the resin long enough before infusing?

that is quite a heavy cloth and you could be transferring air from the resin to the weave joins.

I noticed this in some of my early infusions and have a better finish since leaving to degas a little longer, this is only from my own work as ive read people post that they don't worry about air bubbles in the pot.
Hanaldo
Hanaldo
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Looking at the TDS, the resin looks good so that shouldn't be an issue. And if your ambient temps are good then that should be fine too. 

I think it's dry. What is your exact layup, ie. How many layers of carbon, is your infusion mesh covering the whole part, etc. How much resin do you mix up and how much do you have left over? 
GO

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