Mercredi 31 août 3 31 /08 /Août 03:20

Title: can i use peel ply with polyester resins? Tag: peel ply, composites peel ply is normally a layer of composites that gets coated with epoxy or in this case polyester resin, with the rest of the lay up. It is the last or top layer. When the resin dries, the peel ply layer doesn't bond to the other composite material and can be peeled off. this leaves behind a surface that can be ideal for bonding on additional composite layers or other composite parts with no additional grinding or extra sanding required. It also leaves a surface that can be easily prepared for finish sanding if the part is going to be primed and painted. ou can use peel ply for polyester resin. If you are doing a large area and you have the choice of light or heavy weight peel ply. Use the heavy weight it is much easier to use. Also someone used peel ply to stop the green mesh from sticking to the foam he was vacuum bonding to the hull.(using polyester resin) There are two significant problems when laying up a lamination of epoxy and a reinforcing fabric. 1. There are points where you transition from a single layer of cloth to two (or more layers), or where a single layer of cloth transitions to bare timber, (such as at the edge of a taped-seam), tend to be ragged and the edge, or selvege, of the cloth lifts up to form a ridge which is difficult to sand and fair; 2. The surface of the cloth is usually uneven and requires further filling with epoxy resin/hardener mix. The problem here, apart from time and labour, is that you need to ensure that subsequent layers are applied while the preceding coats are still chemically active. If not, you must remove amine blush and then sand the surface to provide a keyed surface suitable for a mechanical (rather than chemical) bond - commonly referred to as a secondary bond (rather than a primary bond). In many circumstances, you can get around all of these issues by applying a layer of "Peel-Ply" over the epoxy/fabric layer while it is still wet. The peel-ply is simply a fine-weave fabric - a bit like shower curtain - which allows epoxy to wick through but does not adhere strongly to the wet epoxy. When the epoxy cures, the peel-ply is 'peeled' off to reveal a nicely filled fabric (due to the magic of capiliary attraction or surface tension, or something like that!). In the process, the amine blush is removed and the resulting surface is ready for the next coat - or it can be lightly sanded and then painted. Here are a few pictures of a small job I did yesterday and the day before. It involved the application of three staggered layers of uni-directional carbon-fibre over the outer surface of a snotter attachment cleat on a carbon mast I'm setting up for a customer - it could have been anything, but this little job demonstrates the process quite well.

Par walkingfreezerwinter - Publié dans : peel ply, composites materials
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