the green resinflow is just fine for me, as you can see there are no pinholes here…
Ive been away generating more and more test pieces in the last month. I managed to get rid of the bubbles/pin holes by removing the green flow media completely and relying on the peel ply to carry the resin. So even though the pinholes etc seems to be sorted I now have another issue…
Im continously getting air in the resin feedline. I know it sounds like a simple thing to solve but for the life of me I cant figure out where the bloody air is coming from. The end of the resin feedline is still dipped well within the resin (left in the cup) when I clamp off. So even if the clamping doesnt work well no air should be entering the line except for resin.
The part infuses beautifully. I then add a heat source (2 spots) about 50cms above the part and a short while thereafter I can see the air being pulled into the vacuum line. I can only see air entering the vacuum line. It doesnt seem to be coming from anywhere else. Its a pain in the a#$ to test every time because I basically need to go through the entire process before I get to check whether the air pushes its way back into the resin line.
Any ideas?
which resin again? Everytime I use VER, the styrene degasses under vacuum in the line, and I pull VERY VERY VERY fine bubbles up the inlet tube to the part. I always have extra resin and a long pot life to make sure it feeds through the part enough to get bubbles out.
Is your inlet clamp making a hole in the tube? else, I can’t figure out how you get air in the inlet tube if the tube is in the resin!!
Is your resin bucket ABOVE or BELOW the part?
Im currently using a proper epoxy infusion resin. The resin is on the same level as the part at the moment. Both level on the same table.
Cheers
aha! does that matter? mine is at the same level too, i dont wanna waste too much vacuum line, i use about 40-50 cm each time…
After a short while Ive given it another attempt. With this attempt the part infused much further in the process before the air leak was visible in the resin line. Unbelievable - I may have to purchase an expensive leak detector to ensure that there arent any leaks. Problem is that the air starts creeping in from the resin inlet after the infusion has completed about 95%. Then its tickets…all I can do is watch the part die a slow death
The only thing I can think of is that the bag develops a leak near the resin inlet. A possible plan is to add a vacuum line (clamped off) near the resin feed line for safety. So when air does start entering the resin feedline and because the part is near to 100% completion I can open the vacuum near the feed to allow the air to escape without passing over/through the part???
Another comment I read in relation to where the part is in reltion to the resin inlet and resin pot is that the part should be raised above both. The excess resin would then ruun through to the pot and the resin line wouldnt create a syphon effect…
Any other ideas would be great:confused: . That includes training opportunities anywhere in the globe at this point in time. Im in the process of shooting a video of the steps. Im hoping that the error is easily spotted.
Hmmm, when ever I get a leak I can usually track it down, you can see a thin stream of bubbles forming at the source of the leak.
do you always start to get the bubbles in the resin line?
There is a small amount of air that is pushed out the resin line when the clamp is removed but that gets drawn through the part and out the vacuum line. Its only very close to the end of the infusion that the air almost forms small voids that I could see in the resin line (wrap).