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Is it recommended when working with XPREG prepregs to make the surface ply a few millimetres larger than the backing ply? It was a recommendation in your “Beginners’ Guide To Out Of Autoclave Carbon Fibre”. However the recommendations of this guide are based on Easy Composites old line of carbon fibre prepregs: Easy-Preg.
Here is the relevant passage out of the above mentioned guide:
“In most cases, when laminating a part the surface ply should be made a few millimetres larger than the backing ply/plies. This is done to ensure that the air path that is created by the special dry side of the Easy-Preg Surfacing Prepreg is not maintained all the way out of the laminate ensuring that any air trapped in the reinforcement can be removed when the part is vacuum bagged. In practice, it is not necessary for the surfacing ply to extend beyond the backing ply all the way around the part but it should be aimed for as a matter of good practice. Although you could make templates, one for the surface layer and one for the backing layer, it is usually sufficient to simply mark out the surface layer by drawing slightly wider than the template when you transfer the template to the prepreg material, making a separate template for the surface layer unnecessary.”
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