pre-preg pinholes.. driving me crazy


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roger sbk composites
roger sbk composites
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this is the third part that comes out exactly the same and i've done 3 diff things so far.... my kitchen oven minum is 76c so i leave that 2 hours and then take it to 110c this time i added peelply on the edges but nothing... the stack is as fallowed  2 layers of pre-preg aviation no face side... ... eassycomposite unperforated release film and breather all over the mold put inside a bag and full vac... any ideas guys... this is dirving me crazy already 


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combustioncraig
combustioncraig
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Hey I am new here but I am mechanical engineer and here are my thoughts.  You have bridging for sure like everyone else has pointed out.  I would try using a heat gun to get the prepreg pliable (but sticky trade offsErmm) and a tool like the lil'chizlers (or any Vinyl wrap applying tools) to push the Prepreg down into the voids.  It is also recommended to debulk after the first layer and then every 4-5 later after that. Doing so gets expensive quick unless you are using some sort of RVB (reusable vacuum bag).  You also might be able to order just sheets of epoxy resin (at least you can here in the USA).  This is a less ideal option as you will have very resin rich areas that are weaker but if you are just going for surface finish it might be a option (make sure the resins have the same cure rate as your prepreg).  Hope this plus slower the ramp rate/ longer dwell time at low temp cures the problems.  Also lacquer and clear coat may become your new best friends if you continue to have problems.     

On a side note I am going to be doing a test with some low temp epoxy prepreg for a autoclave and add a thin sheet of epoxy resin (same resin and same supplier) and see how it affects the surface finish.  I am doing this because after using easy composites surface layer prepreg(resin rich stuff) I thought I might try it.  If it does work this will save a ton of money but I am not too hopeful.  I will do some ultrasonic testing and cut a few layers apart to see if the interior layers are full of pin holes as well just to prove the concept.        
GO

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roger sbk composites - 11 Years Ago
roger sbk composites - 11 Years Ago
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roger sbk composites - 11 Years Ago
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matthieutje65 - 11 Years Ago
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roger sbk composites - 11 Years Ago
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roger sbk composites - 11 Years Ago
roger sbk composites - 11 Years Ago
baja_patient - 11 Years Ago
roger sbk composites - 11 Years Ago
morepower - 11 Years Ago
roger sbk composites - 11 Years Ago
roger sbk composites - 11 Years Ago
roger sbk composites - 11 Years Ago
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fgayford - 11 Years Ago
combustioncraig - 11 Years Ago
roger sbk composites - 11 Years Ago
Djekouk - 11 Years Ago
roger sbk composites - 11 Years Ago
Djekouk - 11 Years Ago
     Cool design :-)
Djekouk - 11 Years Ago
morepower - 11 Years Ago
roger sbk composites - 11 Years Ago
Djekouk - 11 Years Ago
                 No problem let go on pm
roger sbk composites - 11 Years Ago

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