Pinhole uneven surface

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Pinhole uneven surface

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primoz1111	primoz1111 posted 10 Years Ago HOT Topic Details
Group: Forum Members Posts: 3, Visits: 31	Hello! First hi to everyone using this forum, you got nice community here. Ok the PROBLEM I am using 245 2x2 twill 43% resin rich prepreg. As you can see the resin in not equally spread through surface. My product demands 2 layers of prepreg so when i stack the layers i turn the the sides with more resin facing each other then i combine them so the most resin is in the middle of fibres letting the vacuum do its job. When i vacuume the prepreg i use release film perforated and breather all stuck in vacuumbag. My tactic is 3h of vacuuming on room temp then 1-2h on 45C, 1h on 60C and 1h on 70C after that i cure it at 120C for another hour more This is my BEST result : So here is the problem why is here areas of pinhole free surface and with pinholes is it the resin not evenly spread the or the problem is my tactic of vacuuming any tips or help will be nice. P.S. I am using http://shop1.r-g.de/item/390102S vacuum pump Tags pinhole pinhole free prepreg Edited 10 Years Ago by primoz1111
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primoz1111	primoz1111 posted 10 Years Ago HOT Post Details
Group: Forum Members Posts: 3, Visits: 31	I have no problem with sealing. My vacuum stays if i stop the pump but i use pump all the time during the cure process.
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Julien	Julien posted 10 Years Ago HOT Post Details
Group: Forum Members Posts: 16, Visits: 2.8K	Hi guys, Can you give the technical data sheet of your prepreg ? 2 reasons that may resolve your problem : - The first one, when you cure your preg , (if its a 120ºC class) you have to reach 80°C at 3-4°C/min. Rest at 80ºC during a maximum of 30 min and then up to 120°C for 1h minimum at 3-4°C/min. A 120ºc class prepreg reaches his minimal viscosity at approx 110°C. If you wait too many time under 80°C, the prepreg can cure when the resin is not enough fluid... -2nd thing is that your prepreg is not an "out of autoclave" so it must receive more than 1 bar of pressure. This is why we have to read the TDS. Julien
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Pinhole uneven surface

primoz1111 - 10 Years Ago

I'm getting the same surface finish when I vac bag my wet layup. The effect (on both our items)...

amgrace - 10 Years Ago

I have no problem with sealing. My vacuum stays if i stop the pump but i use pump all the time...

primoz1111 - 10 Years Ago

Hi guys, Can you give the technical data sheet of your prepreg ? 2 reasons that may resolve your...

Julien - 10 Years Ago

You need to get a proper Out of Autoclave pre-preg to be honest. This part is only 2 layers thick...

morepower - 10 Years Ago

You say you are using a perforated release film?! must be an unperforated one! ratio fabric/resin is...

matthieutje65 - 10 Years Ago

I never used pre-preg but looking a lot of video, as Matt said right, they use only unperforeted...

Jacopo Carbonio - 10 Years Ago

[quote][b]primoz1111 (17/04/2015)[/b][hr] Hello! First hi to everyone using this forum, you got...

fgayford - 10 Years Ago

Hello! Tnx for all replays. It was help full ALLOT!!! i did it no pinholes at all i cant be...

primoz1111 - 10 Years Ago

[quote][b]primoz1111 (22/04/2015)[/b][hr] Hello! Tnx for all replays. It was help full...

creator - 10 Years Ago

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