05-26-2016, 08:14 PM
Join Date: Oct 2011
Location: The Race Track & St Pete FL
Total Cats: 49
Per the Easy Composites Page:
Vacuum resin infusion is a sophisticated technique for manufacturing high performance, void free composites even on large or complicated moulds. The process is ideally suited to the manufacture of carbon fibre composites and is widely used by professional manufacturers for the production of carbon fibre body panels such as bonnets and by marine manufacturers for the production of boat hulls. In resin infusion, reinforcement is laid into the mould ‘dry’, i.e. without any resin, and then enclosed in a specially configured stack of bagging materials (such as peel ply, infusion mesh and bagging film) before being subjected to vacuum pressure using a composites vacuum pump. Once all the air has been removed from the bag and the reinforcement has been fully compressed under this pressure, liquid epoxy resin (mixed with hardener) is introduced to the reinforcement through a pipe which then infuses through the reinforcement under the vacuum pressure. Once the resin has fully infused through the reinforcement, the supply of resin is cut off (using a pipe clamp) and the resin is left to cure, still under vacuum pressure.
Advantages of resin infusion
Resin infusion, when done correctly, can produce parts of incredible strength and quality of appearance. The combination of vacuum pressure along with carefully placed vacuum consumables (such as peel-ply and infusion mesh) mean that the finished composite will have absorbed resin at the optimum resin-to-reinforcement ratio, avoiding resin-rich composites or variations in performance inevitable with traditional wet-lay manufacture. The resin infusion process also eliminates some of the problems that can blight wet-lay composites, such as air voids (caused where the reinforcement has bridged around tight corners) and tiny air bubbles caused by air trapped within the laminate. The quality of epoxy ‘infusion resins’ means that resin infused parts can be made with strength to weight ratios that can rival parts made using pre-impregnated (pre-preg) reinforcement systems
Most well thought out VIP setups will run about 30%-40% resin content. On the hood mould I'm making is going to be a VIP setup and I will do a UV epoxy in the skinning layer. When I was making another trunk I would rather work with 10.9 oz instead of using 2 layers of 5.7 oz, do to the 5.7 likes to unravel easily. The hood has to built strong its going to with stand 120-160 mph, so at 100 mph there is 140lbs of uplift on the hood and at 150 mph 210 lbs. If you have no problem standing on it, then it should be built strong enough.
I built a oven at work 8'x8'16' and used 2 propane room heaters. The heaters move the hot air long the back wall in a counter clock rotation around the room. The air exits near the bottom since heat rises. The room was contructed with plywood wall, 2x4 framing and 1" foam insulation board.
If its a small oven like for a hood, a heat gun could be used with a thermal coupling under the center of the mould.
BTW the hood measures 52"x 49"
Last edited by 1993ka24det; 05-26-2016 at 09:42 PM.