carbon wet-out consistancy issues.


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jono
jono
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hi all, i'm having issues with the final part not wetting out enough consistently. I am using the same mould, same layers, same resin and temperature conditions. absolutely no leaks in the bag and obviously the same vac pump. it visually appears to infuse at the same rate every time but only 1/3rd of the time it's actually fully wetting out the weave. it seems to be luck of the draw for me? i'm using a low viscosity resin, pulling a vacuum for at least 40 mins before infusing. i've tried clamping off the vac line and resin line like the easy composites tutorial, i've also tried allowing the resin to almost empty the pottle and only clamping the resin line and allowing excess to reach the catchpot and letting it cure wit vaccuum pump going. also moving around the resin feed/vac lines. i honestly have no idea what the cause is. would appreciate any help here.

this is what my parts come out like 2/3 of the time.




yet sometimes my parts come out perfect like this (same exact mould)-ignore the traces of clay on it-




any idea what could be doing this? i'm doing a fully dry layup, no glue or gel coat (its a brake duct) should i perhaps consider brushing/spraying a fine layer of resin down and allowing it to almost fully cure to a late stage of tack and then layup/infuse? 
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20_rc51_00
20_rc51_00
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if that last one was a vac bag and not infusion Id say you drained off too much resin with the bleeder. 

The dry problem is not an issue with vacuum imo. its an issue with resin starvation/saturation whcih comes down to controlling the rate of resin infusion speed or amount of resin bleed off into the breather layer(with vac bagging).

The former addressed with slowing the resin inlet for a given resin viscosity and the latter with changing the amount of perforations in the release and/or reducing the thickness of bleeder/breather layer that that when it does saturate it isn't so thick that it takes up all the resin.

Could it also be that your carbon has a coating designed for a certain type of resin and your current resin is phobic to that coating?
GO

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