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Gaurav Kumar Thakur
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can we use glass fiber(epoxy as matrix) mold for CFRP component?
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牟达能
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MDC is a leading compression mould company and a high-quality carbon fiber mold supplier. We have professional knowledge in carbon fiber molding technology.
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Matt (Staff)
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+xIs 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.” We don't see this as necessary for either the XPREG component systems (XC110 / XC130) or the tooling systems. There is laminating guidance for all of these systems but it does not include the requirement to run the surface layer past the backing plies. The reason is because all of the layers now breath, not just the surface ply (as was the case with the Easy-Preg).
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cumberdale
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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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Anders R
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+x+x XT135 Processing Handbook, where do I find that? Anders, you got me! - Paul was finishing that off, I'll chase it up with him and get it published. Thanks for the reminder  UPDATE: Guide is sorted now, it just needed adding to the product page. You can now download the XT135 Complete Processing guide from the product page or by following this link. Great, thanks!
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Matt (Staff)
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+x XT135 Processing Handbook, where do I find that? Anders, you got me! - Paul was finishing that off, I'll chase it up with him and get it published. Thanks for the reminder UPDATE: Guide is sorted now, it just needed adding to the product page. You can now download the XT135 Complete Processing guide from the product page or by following this link.
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Anders R
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XT135 Processing Handbook, where do I find that?
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Matt (Staff)
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+xjust watched the video again, the finish you get is really good, usually I do 45° strips on any tight corners and features but you only done a couple in yor video. There must be a very high resin content to get the material to flow into the corners? Hey Scott, well, it this system works a little differently to a conventional single ply prepreg. The surface ply does have a relatively resin rich 'scrim' although overall the ply is not unusually resin rich. I would say that it is easier than you would normally expect to avoid problems in internal corners using this tooling prepreg. In the next video in this series we made the actual parts using a more conventional prepreg which did need *very* careful cuts and laminating into the corners in order to avoid bridging or pin-holes in these difficult corners. Certainly cutting strips at 45 degrees for the corners is a conventional method for mould making but we don't find it necessary for the XT135 system.
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scottracing
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just watched the video again, the finish you get is really good, usually I do 45° strips on any tight corners and features but you only done a couple in yor video.
There must be a very high resin content to get the material to flow into the corners?
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oekmont
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There are (usually) no molds solely made of epoxy. The epoxy is all ways reinforced with either glass, or carbon fibres. The advantage of a cte close to 0 only occurs when using carbon. Good moulds, especially infused ones, or prepreg molds, last very, very long. If you are willing to repair some defects from time to time, and don't abuse the mold, several hundred pulls are possible.
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