Vaccume bagging leak

Talk Composites - The Forum for Advanced Composites

Back

Vaccume bagging leak

Author	Message
ajb100	ajb100 posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 346, Visits: 4.4K	Have to agree with Fred, the white plastic infusion mesh is a paint to get to form to a mould and the edges punctured the bag. I went for a short time wrapping the edges in masking tape until I started using a different mesh and not had any problems since
	Reply Like 3
Jdmleesy	Jdmleesy posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 39, Visits: 380	I will defo do that Fred thank you although it didn't look like it had pierced it there b4 but it was only a tiny leak so I could if missed it i suppose.I'm just prepping the mould up ready to give it another go tomorrow hopefully. Do u guys envelope it aswel or use the pleat method because I don't know if I messed up on the gumtape b4 but I was so carful
	Reply Like 3
Jdmleesy	Jdmleesy posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 39, Visits: 380	Ok so iv just bagged up the mould and I think its worked. iv tried abit of everyone's advise iv enveloped the part which seemed so much easier to make sure there's no wrinkles as I take the protective tape off the tape and iv put peel ply on every part of the mesh that's cut.so iv now pulled vac onit and iv got to 29hg better than I had b4 and when I turned off the pump I couldn't hear one leak iv just gotta do a drop test now but I got a good feelin
	Reply Like 3
carbonfibreworks	carbonfibreworks posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 292, Visits: 4.5K	Jdmleesy (04/02/2014) Ok so iv just bagged up the mould and I think its worked. iv tried abit of everyone's advise iv enveloped the part which seemed so much easier to make sure there's no wrinkles as I take the protective tape off the tape and iv put peel ply on every part of the mesh that's cut.so iv now pulled vac onit and iv got to 29hg better than I had b4 and when I turned off the pump I couldn't hear one leak iv just gotta do a drop test now but I got a good feelin Good luck Chris
	Reply Like 4
Jdmleesy	Jdmleesy posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 39, Visits: 380	Yes it went well vaccume wise all the way through thanks everyone I had a few problems with the part tho like it looks like it could of been a little more resin rich its all coverd fine but it just looks like it could do with a little more. I used mti on this so I just stopped when it stopped drinkin resin.any ideas? I have got normal spiral hose but I'm using mti while I learn And secondly I had a few tiny overhangs on the corners of the mould which I didn't notice and it broke tiny bits off the corners because I didn't get east lease in there enough I think. Iv sanded the over hangs down now
	Reply Like 3
Jdmleesy	Jdmleesy posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 39, Visits: 380	Bagging Attachments image.jpg (420 views, 1.00 MB) image.jpg (418 views, 1.00 MB)
	Reply Like 4
andygtt	andygtt posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 157, Visits: 1.2K	fgayford (02/02/2014) Jdmleesy (31/01/2014) Thanks everyone il give it all a go tomorrow In my experience the cause of the leak was ALWAYS the same! It was the infusion mesh flow media! Any where you have a cut edge in the bag of the flow media is sharp. If you picture it as the sharp edge of a chain link fence you can imagine how easily it will puncture the bag. To solve this problem I simple cut strips of peel ply ( just 2 inches wide) and place them over EVERY single cut line of the flow media! I have NEVER had a leak since and I do a lot of infusion. Before I did this technic I NEVER had a perfectly sealed bag, and I thought it was impossible to have one. Try it and you will become a believer. Hope this helps. Fred Ive never tried this and almost always infuse with a slightly leaking bag so this is a tip I will be trying... my next part is huge so if this works I will owe you beer
	Reply Like 4
Warren (Staff)	Warren (Staff) posted 11 Years Ago HOT Post Details
Group: Administrators Posts: 2.5K, Visits: 8.5K	I like the saucepan catchpot!! Warren Penalver Easy Composites / Carbon Mods - Technical Support Assistant
	Reply Like 4
Jdmleesy	Jdmleesy posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 39, Visits: 380	Ha thanks warren had to cut costs sumwhere I use the same lid for degassing in a bigger pot
	Reply Like 3
justas	justas posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 8, Visits: 65	I am new in infusion and would be appreciated for any advice. My though is to make boom infused from inside as there are many additional layers in some places inside. So I made a two-sided mold. I put necessary laminate on a table, just glued slightly with spry together. Then peel-ply with a reserve. Then lay net only on the bottom. Another strip on top of tube later. All this I lay to one part of mold. From one end I connected resin inflow hose just 10cm inside on the bottom where is a net. Then I put hard smaller tube covered by vacuum film agglutinated with sealing tape along the mold. Then I lay another net strip on the top and folded all ends of laminate correctly around the hard tube, before connected vacuum hose on the other end of mold at the top between peel-ply and net. After I extracted the hard tube from the inside and slightly folded inside all laminate to cover with a top side of mold. Before covering I lay seal around a perimeter and covered with a top mold. Sealed up both ends and tautened all sides of mold together every 50cm. The I vacuumed it and everything looks great for 15 minutes. So, there are no leaking. I didn't put a spiral as a tube is D=75mm and I think the net is enough for resin flow.After 20 minutes infusion I observed resin flow in vacuuming end of mold, but it flows with air bubbles. I tried this 4 times and the result is similar. After demolding there are small bubbles of air on the top of the product. Where is this air from and whats wrong? Thanks!
	Reply Like 4