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Old 10-15-2013, 05:54 AM   #1
Hagi

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Default Carbon Pressure infusion

My question in this:

in flat molds, can i use a heavy Weight, sitting on the carbon layer
(and on the carbon layer itself - some cloth to Absorb the access resin,
instead of putting it in a vacuum bag?

how much pressure does it need in a vacuum bag usually? (in psi)
and What's equivalent it in Kg? (conversion psi - Kg)
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Old 10-15-2013, 10:10 AM   #2
herman

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Vacuum generates some 9500-10000 kgs of weight per sq m.
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Old 10-17-2013, 04:52 AM   #3
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Default Re: Carbon Pressure infusion

Quote:
Originally Posted by Hagi View Post
My question in this:

in flat molds, can i use a heavy Weight, sitting on the carbon layer
(and on the carbon layer itself - some cloth to Absorb the access resin,
instead of putting it in a vacuum bag?

how much pressure does it need in a vacuum bag usually? (in psi)
and What's equivalent it in Kg? (conversion psi - Kg)
I am very interested in this technique. I have been making flat sheets in a flat mold with weights but have never used cloth to absorb excess resin. Can you please explain what cloth you use and the technique a bit more please? My sheets always come out resin rich but I'd have thought a cloth to absorb resin would bond to your part.
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Old 10-17-2013, 05:25 AM   #4
herman

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Mould
Laminate
Peelply (optional)
Perf film (P3, P31)
Bleeder (a nice even one, like Airtech Econoweave 22 or 44)
Protective film
Board (wood or so)
Weights / clamps
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Old 10-21-2013, 01:53 AM   #5
Hagi

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so, what i understand is, that this is POSSIBLE. if i take my car (1000 KG) And put it on the mold (with a flat surface on it) IT SHOULD WORK!
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Old 10-21-2013, 09:03 AM   #6
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If your mould is flat, yes. It shows the force vacuum generates.
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Old 10-21-2013, 11:28 AM   #7
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Quote:
Originally Posted by Hagi View Post
so, what i understand is, that this is POSSIBLE. if i take my car (1000 KG) And put it on the mold (with a flat surface on it) IT SHOULD WORK!
If your mold top is VERY stiff. Else it will warp under the point weight of the wheel contact point.
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Old 10-21-2013, 03:58 PM   #8
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Use a big steel beam (or piece of railroad track, etc) and park your car on that to distribute the load. Remember that you're only getting a portion of the car weight if you use one or two tires. If you use all four tires then please send us the picture!

Or better yet... make a cheap DIY vacuum bagging system out of some poly sheeting, caulking, and a fridge pump and get the same results. Google how to make such a system. And make sure to watch you don't catch the pump on fire from running it too long (do in a safe place in case a fire starts).
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