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Author Topic: Air Bubbles  (Read 2771 times)

Offline MasonForman

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Air Bubbles
« on: 03/31/14 15:13 UTC »
Waiting for my injector to come in the mail so I decide to mess around and do an open pour on half of the mold, but there's air bubbles all in the plastic and I mean A lot of air bubbles. I put heat stablalizer in there and all but there's still air bubbles all in it.
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Online ctom

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Re: Air Bubbles
« Reply #1 on: 03/31/14 15:15 UTC »
How humid is it where you're at today? That can play a big part in bubbles. Did you wash your cups lately? If cups aren't absolutely dry you can get bubbles.
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Offline jl3140

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Re: Air Bubbles
« Reply #2 on: 03/31/14 15:16 UTC »
That usually comes from moisture in the plastic. It has nothing to do with stabilizer. Is this remelted baits?
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Offline MasonForman

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Re: Air Bubbles
« Reply #3 on: 03/31/14 15:18 UTC »
Nope liquid plastic and it doesn't seem that humid , I'll try washing the cup out and doing it again
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Online ctom

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Re: Air Bubbles
« Reply #4 on: 03/31/14 15:30 UTC »
Tip....wash the cup with soapy water, rinse very well in running clear water, dry then heat the cup in your microwave empty for 20 seconds. Allow it to cool the proceed.
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Offline BareKnuckleJigs

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Re: Air Bubbles
« Reply #5 on: 03/31/14 15:49 UTC »
I rarely have any of those problems since I started cooking in a pot and have gotten away from cooking in a microwave.  A pot on an electric burner is the way to go, hands down.
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Offline MasonForman

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Re: Air Bubbles
« Reply #6 on: 03/31/14 16:31 UTC »
Just bought a presto and the washing helped a lot!
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Offline Bugpac

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Re: Air Bubbles
« Reply #7 on: 03/31/14 18:39 UTC »
Ive researched this a lot. H20 boils at 212. Its not gonna linger in 350 degree plastic.

Moisture in plastisol sounds like Rice krispys when heated.
« Last Edit: 03/31/14 18:43 UTC by Bugpac »
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Offline DF

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Re: Air Bubbles
« Reply #8 on: 03/31/14 19:03 UTC »
 I find a lot of times that I'm the one putting bubbles in the plastic by stirring it in. If it's real bad I will hit it with a good shot of heat stabilizer and boost the temps a bit, the bubbles will rise to the top a lot faster in the thinner plastic.
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Offline Bugpac

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Re: Air Bubbles
« Reply #9 on: 03/31/14 19:12 UTC »
Exactly Df.
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Offline andrewlamberson

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Re: Air Bubbles
« Reply #10 on: 03/31/14 19:21 UTC »
Normally...microbubbles are caused by water vapor in the plastic. It can come from water vapor on your cup, air from the microwave (which seems to dry out over a couple reheats) or it can be picked up by leaving you plastic open to the air.

If you wash your cup, make sure you dry it really well...and then give it 20 secs or so to drive the water vapor off.

However, I've been doing some testing and another cause of microbubbles can be due too the plastic not being completely mixed. 

If they are really big bubbles...you may have mixed them in by stirring the plastic to aggressively or by shaking the plastic (vs a mixing type motion).

My final observation is...funny how we get very few posts on microbubbles during the winter....and as soon as spring rolls around....!
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Offline Bugpac

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Re: Air Bubbles
« Reply #11 on: 03/31/14 21:47 UTC »
Ill have to make a few videos for you guys. :)
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