thanks a lot for you precious advices

I did another infusion following the Hanaldo advices (it was before Warren replied) and I got really better results. here what I did: 




I did have A LOT less bubbles, and just a little bit on a corner (and a lot more on the exterior side on this same corner which is now cutted)
I suppose I didn't press enough the reinforcement/vaccum consommables on this corner or perhaps I should have cut the peel ply like I did for the carbon cloth and the infusion mesh...

Is it possible for this bridging to come from a fold/bend of the vacuum bagging film above a corner like on the picture (and so I should move this fold/bend on a flat surface when doing my vaccum bagging positionning)?

Thank again mates for your time 

It isn't that the pleat in the bag causes any bridging, more that if you have a large pleat in the bag then this is film that isn't in contact with your mould - so you should try to spread those large pleats across to make several smaller pleats, which means you have more bagging film in contact with the mould in that area.

Definitely getting there! I think a bit more time positioning the bagging stack and you will eliminate the bridging entirely.

The problem I see here is that you put the pleats exactly where the aren't needed. Look at the third picture. The bag has to go through the corners without additional bagging film and therefore will be under tension. Instead of one pleat per side in the middle try two per side, one at each corner of your model.

Hello mates

I followed your advices and did the pleats on the corners and I had good results, bubbles looks to be gone ^^
THANKS A LOT !!!



But I experiment lacks of resin now between the twills of the reinforcement... how it can be seen below. It's rough, not smooth when polishing with a microfiber which grips on it. 
I precise the mould has been sanded and polished 150 / 400 / 600 / 800/ 1000 / 1200 / 1500 / 2000 / 2500 / 3000 / 5000 / no polishing before the problem happened.


Do you think it's because of the sanding? The mould wasn't perfectly flat so I had to sand it and I'm now hesitating to spray it with automotive 2k clear coat before polishing, polishing like it is or  it s perhaps a mistake from me during the infusion? :/

Cheers

Looks like it's a little on the lean side of resin content. Next time you infuse, try clamping the vacuum line when the part is fully infused, wait 30 seconds to 1 minute and then clamp the resin feed line.

Looks much better than before.  Hanaldo's tip is great for cosmetic parts, that little bit of extra resin helps reduce pinholes and gives a slightly smoother, less textured surface. 

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

sorry for answering so lately

I tried what you suggested and it gave a pretty good result. I sent the plates to be sprayed with automotive laquer and it looks very good.



I'm moulding bigger trays actually. I go for new adventures

Thaks again guys