Talk Composites - The Forum for Advanced Composites

Pinhole uneven surface

http://www.talkcomposites.com/Topic16428.aspx

By primoz1111 - 4/17/2015 10:41:31 AM

Hello!

First hi to everyone using this forum, you got nice community here.

Ok the PROBLEM Smile

I am using 245 2x2 twill 43% resin rich prepreg. As you can see the resin in not equally spread through surface.

http://www.talkcomposites.com/Uploads/Images/a746b9e6-2ca7-466c-979d-6ad2.jpg

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 :
http://www.talkcomposites.com/Uploads/Images/776ae16c-55ea-4f41-813b-0564.jpg http://www.talkcomposites.com/Uploads/Images/548b377e-f518-4eb1-8898-4353.jpg

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 


By creator - 5/15/2015 11:10:27 AM

primoz1111 (22/04/2015)
Hello!

Tnx for all replays. 

It was help full ALLOT!!! i did it no pinholes at all i cant be more happy.

http://www.talkcomposites.com/Uploads/Images/0de77f65-a57f-4497-bd68-b68a.jpg

Tnx for all yours hellp!!