Anyone here using continuous strand mat with their infusions?? I am having a problem with it retaining air. I would infuse and then about 5 minutes later a lot of little air will start to rise to the surface. I have no leaks in the bag as well. What type of mats are you guys using so I can get your brand and try it out!
I use Cont.strand mat for flow media with real thin resin like thinned VER (that causes it’s own bubbles) or I peel it into 3 sheet’s from one and use it over normal flow media so the normal flow media does not poke the bag.
I use the continuous strand mat as a sacrificail layer with no problems.
i made a diaper that was abosrbing a lot of esin that made it seem like it was retaining air but it was the diaper that was the problem
We use a “Rovicore” material made by “Chomarat” in France. It has a flow media + glass on either side. It conforms incredibly, and is not too much money (around $8.00/Kg) it works great for us I recommend it very much. It is designed for vacuum infusion and VARTM.
I have tried those too ,but that inner flow material is just a low strength polyester “felt” between layers of stitched chopped strands. It not particularly worthy of the high fibre fractions VIP offers.
It is made for the RTM industry which is trying to make items as cheaply and quickly as possible, with little regard to weight or strength
If you sandwich CFM (continuous filament mat) between stitched or woven long strand fibres you will do much better i feel
Cheers Ian
i pretty much just stopped using it all together. I still use a little for flanges on my roof caps that I ship uncut but other then that, that is it
DT: I had the exact same problem.
We had to make a few parts that required 7781 E glass, no surface coat, 8 plys, using Adtech epoxy.
The parts would infuse fine, verified to be leak free (leak detector), and then I would come back a half hour later and there would be hundreds of micro bubbles. After the part cured they would be scattered through out the part, and the part would be considered a reject.
After about 10 rejected parts the thing that cured it was to not over lap any flow medium. I would butt the edges together instead of overlapping. Came out air free with the exception of one or two air bubbles that was left in the resin from mixing.
If thats not your problem then I agree with FZ1. Its probably gas.