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Author Topic: Air Bubbles  (Read 5074 times)

Offline Blackhawk19

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Air Bubbles
« on: 06/11/14 13:30 UTC »
Lately I've been getting a lot of air in all the plastics I mix, I thought it might have been the plastic but I'm getting the same in a new gallon. I'm also using a new bottle of heat stabilizer. I've tried heating slow and faster but I seem to get a lot of small bubbles and almost a foam on top. Any ideas are welcome.   
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Offline fasteddyc

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Re: Air Bubbles
« Reply #1 on: 06/11/14 13:45 UTC »
Check the 0 rings in your injector. They may need replacing.
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Offline andrewlamberson

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Re: Air Bubbles
« Reply #2 on: 06/11/14 14:28 UTC »
Sounds like you are getting "micro bubbles" which are an issue during periods of high humidity. Foaming is a sign!

My molding area has a dehumidifier running 24/7 this time of year. I also wipe out my cups with a clean cotton towel (paper towel seems to hold moisture and doesn't work as well for me). Then I microwave the cup (dry) for about 20 sec. before I use it.

I also have a old cup of plastic that I run through the microwave before I start with new plastic. My thought is that the air IN the microwave is high in humidity and that is causing issues.

It seems that those of us that use microwaves have more issues with micro bubbles that those that use pots or heat on  a burner. Again, I think the microwave air circulating around inside the unit causes issues if it is humid.

Over the weekend I was getting micro bubbles from the same plastic that I was using during the winter.

I also think that foaming and micro bubbles can be caused by the plastic not being completely mixed.

Andy

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Offline Blackhawk19

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Re: Air Bubbles
« Reply #3 on: 06/11/14 14:53 UTC »
The humidity might be the answer since I live it East LA (Eastern Lower Alabama) and our humidity stays in the high range from spring on. I pour in my shop behind the house but it is not air tight so a humidifier is out of the question. I'll try the old plastic and see if that helps. 
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Proud Member Of The Southeast Asia War Games Team 67/68
If the wings are traveling faster than the fuselage, it's probably a helicopter - and unsafe.

Offline Blackhawk19

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Re: Air Bubbles
« Reply #4 on: 06/11/14 14:56 UTC »
Quote from: fasteddyc on 06/11/14 13:45 UTC
Check the 0 rings in your injector. They may need replacing.

Thanks for your reply but it's not the o rings, I'm getting these bubbles when I heat the plastic before I ever try to inject.
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Proud Member Of The Southeast Asia War Games Team 67/68
If the wings are traveling faster than the fuselage, it's probably a helicopter - and unsafe.

Offline DF

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Re: Air Bubbles
« Reply #5 on: 06/11/14 15:01 UTC »
 To get rid of bubbles that happen while I cook, I add extra heat stabilizer and boost the temps a bit more than usual.  Not sure if this will help you but it seems to work for me.
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Offline Blackhawk19

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Re: Air Bubbles
« Reply #6 on: 06/11/14 17:44 UTC »
I'll try that, thanks.
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Proud Member Of The Southeast Asia War Games Team 67/68
If the wings are traveling faster than the fuselage, it's probably a helicopter - and unsafe.

Offline Wallyc14

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Re: Air Bubbles
« Reply #7 on: 06/11/14 19:05 UTC »
I live in va near the coast I have the same trouble when the humidity is up which it is I will heat my plastic  then let it sit in the mic for a min. Then heat again for 15 sec that seems to help me, but I buy plastic that is degassed to begin with but I only have problems when the humidity is high
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Offline Blackhawk19

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Re: Air Bubbles
« Reply #8 on: 06/12/14 05:24 UTC »
Thanks Wally
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Proud Member Of The Southeast Asia War Games Team 67/68
If the wings are traveling faster than the fuselage, it's probably a helicopter - and unsafe.

Offline kipbass

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Re: Air Bubbles
« Reply #9 on: 06/12/14 05:28 UTC »
If you heat your plastic to 350-360, the bubbles will rise to the top and cook off. Let it cool down, and nuke it again to bring the temp back up. You just have to be patient and let it sit there. ** It's not the best way if your producing for sales.
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Offline efishnc

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Re: Air Bubbles
« Reply #10 on: 06/12/14 10:56 UTC »
Mine bubbles as well after nuking, but stirring it and letting it sit for about 30 seconds seems to cure the problem (at least for me)... and it doesn't really take much to compensate for this little bit of cooling when before you pour.
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