Peel ply on pre preg

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Peel ply on pre preg

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Chris Rogers	C Chris Rogers posted 5 Years Ago HOT Post Details
C Group: Forum Members Posts: 120, Visits: 933	+x carbon man - 7/18/2020 12:41:43 PM +x Chris Rogers - 7/17/2020 7:53:27 PM Peel ply will pull about 40g per square meter worth of resin from your laminate. If you can keep your resin by weight fraction above 30% then this is probably fine. Might have some surface porosity issues if you bleed a lot of resin from a very thin laminate. It is very standard to use peel ply on pre-preg! What you're after is called a caul plate - a semi-flexible B-side tool that provides pressure but also leaves a nice finish. If the shape is simple but curved a piece of silicone sheet can work. For more complex shapes you'll need something soft but that holds a shape locally to keep the part smooth but not reduce the pressure of the bag. These can be cast silicone or latex in a production environment. A thin stretchy rubber sheet might work... do you have a picture of the geometry? Thanks I might try silicone sheet. Would this go direct onto carbon or still use release film? It depends - probably release film would be safer but plenty of parts that aren't going to get secondary bonded are cured against silicone and if the silicone itself is fully cured transfer shouldn't be an issue.
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carbon man	carbon man posted 5 Years Ago HOT Post Details
Group: Awaiting Activation Posts: 86, Visits: 1.2K	+x Chris Rogers - 7/17/2020 7:53:27 PM Peel ply will pull about 40g per square meter worth of resin from your laminate. If you can keep your resin by weight fraction above 30% then this is probably fine. Might have some surface porosity issues if you bleed a lot of resin from a very thin laminate. It is very standard to use peel ply on pre-preg! What you're after is called a caul plate - a semi-flexible B-side tool that provides pressure but also leaves a nice finish. If the shape is simple but curved a piece of silicone sheet can work. For more complex shapes you'll need something soft but that holds a shape locally to keep the part smooth but not reduce the pressure of the bag. These can be cast silicone or latex in a production environment. A thin stretchy rubber sheet might work... do you have a picture of the geometry? Thanks I might try silicone sheet. Would this go direct onto carbon or still use release film?
	Reply Like 4
Chris Rogers	C Chris Rogers posted 5 Years Ago HOT Post Details
C Group: Forum Members Posts: 120, Visits: 933	Peel ply will pull about 40g per square meter worth of resin from your laminate. If you can keep your resin by weight fraction above 30% then this is probably fine. Might have some surface porosity issues if you bleed a lot of resin from a very thin laminate. It is very standard to use peel ply on pre-preg! What you're after is called a caul plate - a semi-flexible B-side tool that provides pressure but also leaves a nice finish. If the shape is simple but curved a piece of silicone sheet can work. For more complex shapes you'll need something soft but that holds a shape locally to keep the part smooth but not reduce the pressure of the bag. These can be cast silicone or latex in a production environment. A thin stretchy rubber sheet might work... do you have a picture of the geometry?
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Warren (Staff)	Warren (Staff) posted 5 Years Ago HOT Post Details
Group: Administrators Posts: 2.5K, Visits: 8.5K	If its a simple shaped part, you can make a matching inner mould and use the "compression" method to consolidate the parts. You could also bolt them together, and vacuum bag the whole thing to help squeeze the mould halves together. Can be a bit difficult sometimes as depending on mould shape, size etc, there might not quite be enough air paths into the pre-preg and making sure you get an even amount of force all over. Warren Penalver Easy Composites / Carbon Mods - Technical Support Assistant
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carbon man	carbon man posted 5 Years Ago HOT Post Details
Group: Awaiting Activation Posts: 86, Visits: 1.2K	+x Hanaldo - 7/16/2020 5:10:52 AM https://www.easycomposites.co.uk/20-8mm-roll-wrapped-carbon-fibre-tube/xpreg-xa120-Prepreg-Adhesive-Film.html Thanks, other than this. Do you have any other tips to get the reverse of the part uniformed flat?
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Hanaldo	Hanaldo posted 5 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	https://www.easycomposites.co.uk/20-8mm-roll-wrapped-carbon-fibre-tube/xpreg-xa120-Prepreg-Adhesive-Film.html
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carbon man	carbon man posted 5 Years Ago HOT Post Details
Group: Awaiting Activation Posts: 86, Visits: 1.2K	+x Hanaldo - 7/16/2020 1:23:36 AM It will work in direct contact with the pre-preg if you have enough resin, ie. more than 3 layers of XC110, or use the film adhesive. Thanks, it will only be 1 x surface ply and 1 x backing ply. What is film adhesive?
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Hanaldo	Hanaldo posted 5 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	It will work in direct contact with the pre-preg if you have enough resin, ie. more than 3 layers of XC110, or use the film adhesive.
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carbon man	carbon man posted 5 Years Ago HOT Topic Details
Group: Awaiting Activation Posts: 86, Visits: 1.2K	Will this work? Mabe release film then peel ply? I'm trying to achieve a uniform flat finish on the back on the pre preg part, and not lines of resin that need sanding out to allow the cover to fit. I tried release film and then breather and it worked great, but it left the face of the carbon with pin holes in. Using xpreg xc110. Thanks
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