Film adhesive for honeycombe core materials

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Film adhesive for honeycombe core materials

Film adhesive for honeycombe core materials

Film adhesive for honeycombe core materials

Author	Message
Toffee	Toffee posted 9 Years Ago Topic Details
Group: Forum Members Posts: 36, Visits: 118	Hi all, I am making sandwich panel and i am looking at making the carbon skins first and then sticking each layer to either side of a nomes honeycomb core material. I have thought of four options here > 1. make the outer skins, key the back of them paint brush resin on to the skins and stick either side of the honeycomb, then vacuum 2. make the outer skins, key the back of them soak the honeycomb in resin and stick either side of the honeycomb, then vacuum 3. make the outer skins, key the back of them adda 400g pre-preg layer to the back of the skins and stick to the core, vacuum, oven… 4. same as options 1 & 2 but instead of using resin use a film adhesive, question is where can i get this from, is there different weights of adhesive if so which is most suitable and where do i get it from?? hope you can help, Lee.
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Hanaldo	Hanaldo posted 9 Years Ago Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	The first option is perfectly adequate. Use peel ply when you're making the outer skins and you won't even need to key the surface prior to bonding. Option 2 is the same, but there's no need to 'soak' the honeycomb, it will only end up with resin in unnecessary places in the cells. Just the bonding surfaces need to have resin on them. Best thing to do is to spread some resin out on a surface and then dip the honeycomb into it. Slide it around a touch to get a nice even coating, then apply the honeycomb to your first skin. Apply vacuum and let it cure. Once cured, repeat the process for the other skin. Bit of a tedious process, but it works really well. Otherwise, I've made several panels by just brushing resin onto the surfaces and then bonding the whole lot in one go. Option 3 would also work, but unnecessary and you need to be sure that your pre-preg won't lose too much resin via capillary action. Option 4, if this is an absolutely critical application then this might be the best solution. However it will only realistically save a couple of grams over wet-laying some resin. This would be a good option if you wanted to do the entire laminate in one shot using pre-preg.
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Toffee	Toffee posted 9 Years Ago Post Details
Group: Forum Members Posts: 36, Visits: 118	Thats great feedback thanks very much, i am going to try options 1&2 on Saturday on two test pieces, i am leaning towards just using a paint brush keeping it nice and simple. I am making a splitter and wanted to test the production method before trying a part which is approximately 2 square meters, would like to get the splitter right first time!! thanks Lee
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fgayford	fgayford posted 9 Years Ago Post Details
Group: Forum Members Posts: 433, Visits: 1.2K	Toffee (29/07/2015) Hi all, I am making sandwich panel and i am looking at making the carbon skins first and then sticking each layer to either side of a nomes honeycomb core material. I have thought of four options here > 1. make the outer skins, key the back of them paint brush resin on to the skins and stick either side of the honeycomb, then vacuum 2. make the outer skins, key the back of them soak the honeycomb in resin and stick either side of the honeycomb, then vacuum 3. make the outer skins, key the back of them adda 400g pre-preg layer to the back of the skins and stick to the core, vacuum, oven… 4. same as options 1 & 2 but instead of using resin use a film adhesive, question is where can i get this from, is there different weights of adhesive if so which is most suitable and where do i get it from?? hope you can help, Lee. Hi Lee I have done some honeycomb work as you described in step 1 and 2. But I don't think you will get the strength of bond with just brushing epoxy resin onto the honeycomb mating surfaces. The resin (in my opinion ) is too thin. What I did was to add cabisol to thicken the resin till it was as thick as epoxy adhesive. I brushed it on the carbon sheet and using a fine nap roller carefully applied the mixture to the honeycomb. I prefit the parts and then peel it apart to see if it imprints everywhere. I then re assemble put release film over the open cells and then breather and vacuum bagged at a low vacuum. Hope this helps. Fred
	Reply Like 1
*VVS*	*VVS* posted 9 Years Ago Post Details
Group: Moderators Posts: 226, Visits: 334	Did a part using nomex just last week and had a play about before committing. I found brushing gave me variable resin thickness and ended up using one of the small paint rollers that are used for gloss paint (not the emulsion roller) and this worked really well. I put a layer of nomex down covered in a layer of peel ply and a layer of breather cloth, I was expecting the cloth to take up some resin but nothing and the nomex was rock solid so very little resin/extra weight was added.
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