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Warren (Staff) - 3/19/2018 10:37:10 AM

Most traditional vacuum bagging you will bag straight after laying up and leave it bagged until cured. No timing it until it gels or any other complicated procedures.  You will need to use no more than around 20% vacuum or you will dry the part out.

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Steve Broad - 4/26/2018 10:27:27 PM

20% vacuum? How do you achieve that? I thought the perforated peel ply regulated the resin content?

Preparing to be educated :-)

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Hanaldo - 4/26/2018 11:07:06 PM

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Steve Broad - 4/26/2018 10:27:27 PM

20% vacuum? How do you achieve that? I thought the perforated peel ply regulated the resin content?

Preparing to be educated :-)

The release film can only do so much, at the end of the day it is just holes in a piece of plastic. How much resin comes through those holes depends on resin viscosity and vac pressure.

Ideally you would regulate the pressure with a vacuum regulator, as this allows you to set a precise level as well as keep the vacuum pump running until cure. Otherwise, if you have a perfectly sealed bag then you can simply pull vacuum and use a gauge to get to approximately 20% or whatever you are aiming for, and then just clamp it up and leave it. Obviously if you have a leak then this doesn't work, which is why having a regulator is an advantage.