removing/stopping defects and strengthen/reinforcement of a part

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ARSOUILLERB26	ARSOUILLERB26 posted 13 Years Ago HOT Topic Details
Group: Forum Members Posts: 16, Visits: 122	Hello everybody, I contact you for a few problems about a carbon kevlar tray I ve made URL=http://imageshack.us/photo/my-images/707/40791410150587709709216.jpg/][/URL] My first problem is for me a real nightmare: tiny bubbles: I eliminated a lot them by using resin infusion (but not all of them) and using bristle roller but to have a perfect finish, I don't see any other way than to varnish (if there is an other possibility please let me know) So I would like to know how to make this perfectly, what products do you use (I didn't see them on your shop) and the application method to have a perfect gloss finish . For my second question, I've done this tray with 2 layers of carbon kevlar and with 2 of red traced carbon ^^ in the middle but it's too flexible specially on the flat part. I would like to know if it's possible for a next one to make it more stiff by putting a kevlar cross in the middle of the reinforcement layers Throughout the flat part and if it will be (for just one kevlar layer) visible on the exterior of the tray? Or if is it possible to make the tray for stiff by an other way (curing?) cheaper than to put 2 or 3 more carbon reinforcement layers. By advance, thank you for all your answers Edited 13 Years Ago by ARSOUILLERB26
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Matt (Staff)	Matt (Staff) posted 13 Years Ago HOT Post Details
Group: Forum Members Posts: 680, Visits: 1.9K	Hi Arsouille, I think the advice you've received from our forum members in this thread is exactly right. Firstly perform your infusion at full vacuum. If you have a vacuum regulator (nice and useful product) you should be using it for applications like vacuum bagging or vacuum bonding, not infusion, which you need to be doing at full vacuum. Secondly, make sure you're running slightly resin rich by clamping off the vacuum line soon after you clamp off the resin feed line. This will significantly reduce the chances of any air bubbles. Regardin the stiffness of the part, a core material is certainly the way to go on this one. What you need in your tray is deflection strength and the best way to acheive that is to create thickness - the best way to do that, without adding lots of weight and cost (of solid carbon or kevlar laminate) is to include a core material. If you use Soric you'll have a slightly denser core than you could have using something like a PVC foam core but you will find it very easy to work with. If you use a closed cell foam then you'll need to drill it all over (2mm holes and 15mm centres) so that the resin can get from the top surface (where the mesh and peel ply are) down onto the surface. The other thing you might want to consider is the orientation of your reinforcement. In your photograph you are demonstrating how easily you can 'twist' the tray. This is 'torsional stiffness' and will be considerably less then the stiffness across the width and the length of the tray if you have oriented all of your fibre at 0,90 (i.e. with the weft and warp in line with, and perpendicular to, the tray). If you rotate some of the inner layers by 45 degrees then you will improve the torsional stiffness of the tray, at the expense of some of the 0,90 stiffness that you have now. I hope this helps. --Matt Matt Statham Easy Composites / Carbon Mods - Technical Sales Tags alignment fibre pin holes stiffness torsional
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removing/stopping defects and strengthen/reinforcement of a part

ARSOUILLERB26 - 13 Years Ago

strange you have pin holes/bubbles in your surface. With infusion, if done correctly you should...

Warren - 13 Years Ago

Salut Arsouille, First, nice idea, I'm jealous, really :w00t: I noticed you said "I eliminated a...

Joe - 13 Years Ago

Yeah I think we need a little more info on how your making it to work out what going wrong... you...

MAVERICK - 13 Years Ago

hello First, thank you for your answers I will try to be as accurate as possible. @warren...

ARSOUILLERB26 - 13 Years Ago

If your only getting -0.8 bar you are not at full vac, follow the EC instructions/video! ABSOLUTE...

Kevin-Lee - 13 Years Ago

Hi, The full carbon one looks nice too... Thats great. And thx Kevin for additional informations...

Joe - 13 Years Ago

as said you need FULL vacuum on the guage. rather than clamping the feed as the resin gets to...

Warren - 13 Years Ago

Hi Arsouille, I think the advice you've received from our forum members in this thread is exactly...

Matt (Staff) - 13 Years Ago

the tray is something that could go with my dinner plates once i do another batch!! :w00t:...

Warren - 13 Years Ago

hi Firstly thank you very much for all your helpful answers !! For the carbon tray, I pulled...

ARSOUILLERB26 - 13 Years Ago

Go see: https://www.easycomposites.co.uk/resin-infusion-starter-kit#video 04:45. Step 8. Add an...

Kevin-Lee - 13 Years Ago

The bubbles have to be coming from somewhere. Have you done the leak drop test properly? perhaps for...

Warren - 13 Years Ago

Okay thank you, :) I gonna try an other infusion for applying all yours advices soon... blue...

ARSOUILLERB26 - 13 Years Ago

what kevin means is which side of your tray is the "shiney" side. Just take it slow and steady.

Warren - 13 Years Ago

Hi, Arsouille. Well I think i'll be jealous again then. Good luck for your project.

Joe - 13 Years Ago

Hi kevin, the peel ply side is the inferior, the glossy superior side is the gel coat side ;)...

ARSOUILLERB26 - 13 Years Ago

Muhaha it looks awesome, especially in the sun. With the summer coming, it will definitely be a...

Joe - 13 Years Ago

Hi Arsouille, That really is getting to be a very high quality looking product. I think yours are...

Matt (Staff) - 13 Years Ago

Isn't it air from the resin? Maybe a "cold" resin from which bubbles would have difficulties to flow...

Joe - 13 Years Ago

Id say try degassing the resin under vacuum before infusing it to elimate the possibility of it...

Warren - 13 Years Ago

Looks Fantastic mate! ...just those last few bubbles to sort out and I think you could have it...

Kevin-Lee - 13 Years Ago

Hey Joe, I think I'm not the only frenchy here, isn't it? :) When you want to share an "apéro"...

ARSOUILLERB26 - 13 Years Ago

[quote] Do you think it's possible it came from the mould surface? Not enough smooth which let...

Matt (Staff) - 13 Years Ago

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