Sorry about the shaky video! I didn't have the tripod so put the camera on some stacked paint cans - bad idea!

Thank you ! Exactly the video and the information I needed !!!

It is good demo to know about bio composite sandwich manufacturing using VARTM. Kudos to the team....

@ExploreComposites

4 жыл бұрын

Thanks! I have a bunch of other bio-composite materials and hoping to do more samples soon.

The natural fibres can be high moisture which boils off under vacuum. Pre dry the material or hold under vacuum for extended period before infusion maybe

@ExploreComposites

Жыл бұрын

Good points - doesn't take much moisture under a vacuum bag to make lots of problems - and it takes a while to boil off. I didn't appreciate how much cork is wood! Probably balsa has similar issues but I never noticed it much before.

A lot of great information in these videos best bang for your buck

I Love your Chanel .. 👍🏻😃

I have used 1mm NL20 recently with quadriaxial carbon fiber facings. Infuses beautifully, great combination.

@ExploreComposites

3 жыл бұрын

Did you perforate the core or did resin work its way through... or just fed both skins? Did you mean 1mm or 10mm? I have some 2 or 3mm that I haven't tried yet... it is neat stuff.

@SuperYellowsubmarin

3 жыл бұрын

@@ExploreComposites I mean 1mm thick. NL 20 is quite a bit porous, so it does not require additional perforations for the resin to flow through !

@ExploreComposites

3 жыл бұрын

@@SuperYellowsubmarin Oh ok, neat! I'll have to try the thinner stuff - my feeling was that the 10mm would need to be perf-ed to really infuse well. It seems like a good alternative at 1-3mm to Soric-type cores - probably lighter too.

@SuperYellowsubmarin

3 жыл бұрын

@@ExploreComposites right, it if quite soft so I wouldn't go thicker than 3mm. Foam is better above that. I compared with Soric LRC and weight-wise it seems barely lighter.

Sehr schön

Really surprised you had issues with the compoflex. It could have been an old or contaminated piece.Good job . 👍👍🤙

@ExploreComposites

3 жыл бұрын

It was a stupid mistake - I grabbed the wrong roll! The material I used here was for wet layup and wasn't meant to be fully infused with resin. I figured it out after I made this video but before I made #25 - where I use the right Compoflex and things go fine!

What vacuum is being hsed

Can the epoxy resin added color?

@ExploreComposites

10 ай бұрын

You could add pigment to epoxy - not sure if it would change how it flows - probably not.

The Compoflex didn’t work because it was the wrong kind - not meant for infusion! See Laminate Sample 25 for the right kind working for infusion... kzread.info/dash/bejne/oJZ3qbCro6nMkbg.html

Looks more that the resin is out-gassing, I.e. the bubbles originate from the feeding spiral.

@ExploreComposites

3 жыл бұрын

You might be right though this is epoxy and there shouldn’t be much there to off-gas.

@kaihorstmann2783

3 жыл бұрын

@@ExploreComposites Expoxy also out-gasses quite a bit. Of course none of the desired ingredients, but it it is also hygroscopic, particularly the hardener. Water vapor also out-gasses provided you apply a deep enough vacuum.

I am no expert (nor even a beginner, yet) but I'll float a theory for what those bubbles are anyway: Could be moisture evaporating under the vacuum (and added heat from resin/table). I heard somewhere that flax fibres tend to have more moisture in them than carbon/glass does, and I imagine the cork might, too. The guys at Easy Composites Ltd seem to leave their flax fibres under vacuum for a while to draw out the moisture as much as possible. Edit: kzread.info/dash/bejne/c3htmq5yiM-phLg.html this is the video I think.

@ExploreComposites

Жыл бұрын

Yes, that is a good theory! I agree with you. Moisture is a problem, and also perhaps that it takes a long time for air to escape from the cork so the resin front passes it by and the air is still trapped. A longer sit under full vacuum to remove all the moisture and air before infusing would help with both issues!

@pinksylvievgc4196

Жыл бұрын

@@ExploreComposites It could be a couple of things: moisture in the core/flax fabric (it is generally recommended to condition/dry/leave under vacuum biomaterials if possible before infusion), the cure could have gotten too hot (moisture boiled off mid cure), or there is some sort of binder within the materials that reacted with the resin (often an issue with resin compatibility more commonly with styrene containing resins.).

@morganverdure6116

8 ай бұрын

I know a snowboards builder who uses flax in his boards... He leaves the cloth in the oven for quite a long time... Two reasons : moisture and dimensions... He says that when flax dries it tends to retract (hope it is the right english word) so when the board dries the camber (shape) changes..

I'm sorry, I just don't see the value in the process. It seems like it would be much faster and just as sound if you pre soaked all the composite and then just vacumed out the air.

@ExploreComposites

Жыл бұрын

Flax and most other natural fibers are like little tubes and it is very hard to get the air out. That and the moisture that gets held in the fibers makes infusion a much better option than wet layup. I've tried and the result was a mess! People do use natural fiber pre-pregs with excellent results, so maybe I'm just doing it wrong.

@edstimator1

Жыл бұрын

@@ExploreComposites what you say makes sense and I understand the thought process. Have you tried plain old cotton ? I've never seen anyone use it and don't understand why that fibre wouldn't work.

You 100% had a leak in the bag.

@ExploreComposites

2 жыл бұрын

You may be right - but “wood” is strange with all the moisture and open/closed cell structure. Finished surface didn’t look like a leaky bag - I’m puzzled too! Need more experiments…

@edstimator1

Жыл бұрын

@@ExploreComposites It was a valiant effort. Nothing wrong with first attempts.