Hi guys,
I’m new to resin infusion, I finally made a sealed mould and did a drop test before infusing.
I did a 3h drop test in which it held vacuum pressure.
The ambient temp was between 25-30 degrees Celsius.

The resin was de gassed
I started infusion by slowly loosening the hose clamp on the resin side while the pump was running.
Once I got full wetout, I clamped the vacuum side, and about 30s later I clamped the resin side.

everything looked fine for 2 minutes, then I started noticing the bubbles within the flow media, these bubbles started forming in different areas of the part.

Then I noticed some areas of the bag were very loose, e.g the area where the vac hose connects to the bag.

I’m not sure what’s causing this but it’s the second time it’s happened to me!

Would appreciate some help

Thanks

Double bagging is not a good replacement for solving the problem in the first place.  I lay down some breather underneath some bagging film on my work table so I've got a soft surface free of anything that can puncture.  Mines taped down but if you use the table for other things, you can use the lay flat tube nature of the film to make a soft "blanket" for the table top.  Keep it perfectly clean and you can rule out the surface from causing issues.  Sometimes breather on the back of the mould can help but sometimes the excess resin soaks into it making it a pain to remove.  Also some sharp points will press through the breather when under vacuum anyway. So getting the back of the mould smooth is important as well. 

If you are getting good leak tests then your basic bagging is fine, its just the finer details tripping you up somewhere and it is better/more efficient to fix them than try double bagging. - remember anything that has punctured one layer of film may be sticking out enough to puncture the next layer!

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant