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20_rc51_00
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how many layers of reinfircement do you have? perhaps your resin front upon infusion is travelling too fast across the part and not fully able to saturate the whole thickness of the reinforcement by the time it has passed by trapping a bubble.... although I would suspect much more entrapment if this was the problem...
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brettalloy
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To Hanaldo. Thanks will try, the pockets that have came in can only be through trapped air/gas. The majority of laminate is prefect, no pinholes. Just the odd void.
The Fibre, materials and bag is all correctly in place, with no bridging. Part full infused, so i can only conclude that the one or 2 air pockets stem from air coming in with the feed.
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brettalloy
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Yes i do, not via a chamber but i mix and leave for 8-10 minutes before infusing
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Hanaldo
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Unclamp your feed line slowly, let the resin move up to the clamp, then clamp it again. Wait about a minute or so for the air to move through before starting the infusion. What do you mean by air pockets? If you're talking about anything larger than pinholes, then something must be going wrong. I never degass my resin, and even then I only rarely have issues with pinholes, certainly never anything larger. The only time larger issues occur is when the bag loses vacuum or there is bridging.
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FLD
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Do you degas your resin fully before infusing?
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brettalloy
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Just an update, as although I have improved things a fair bit im still having a small amount of trapped air. I had a good wet out, and closed off the feed line after the vac line to allow for more resin into the part. Im wondering if the bubbles that have trapped in the laminate, are caused by air getting into the job via the feed line, before resin is introduced. I must stress that the laminate is 95% there, no dry spots, just a few random air pockets. There is no reason to believe the resin would not fill these areas, it must be because of trapped air in the job. Any pointers here greatly recieved. How do you ensure the feed line from the clamp to the feed pot does not take in air, or at least kept to a minimum? Cant see how else the job is failing. Cheers
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fgayford
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Hi
I always close off the vacuum side and wait 10 seconds before I close off the resin in line.
I would also stress, make SURE your resin and mold are warm. I actually pre-warm my mold in the oven to 85 f before I infuse.
Hope this helps.
Fred
brettalloy (10/08/2014)
Thanks! So I will make sure i have abit more resin mixed, once full wet out achieved will close off vac outlet and keep resin feed going for abit longer.
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brettalloy
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Thanks! So I will make sure i have abit more resin mixed, once full wet out achieved will close off vac outlet and keep resin feed going for abit longer.
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FLD
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Sorry should have been clearer. Yes let more resin in after the vac line has been closed. I find with the gel coat in place it infuses just fine but if you dont let the resin flow for a few seconds after the vac has been closed off you get little pockets like this. An extra 10 sec makes a big difference in my hands.
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brettalloy
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Sorry when you mean vaccuum close off do you mean after the part has infused close the vac outlet offbut contiue to pump more resin in through feed. One thing i will say is that as soon as everything has wetted out i am stopping the resin feed, eg not pumping more in. Do i need extra resin fed in to ensure the that i get all the spots in.
The problem i see is spot areas in amongst a decent full infusion, rather than a lack of resin
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