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<DIV>Stress relief is a time-temp-chemistry sort of thing. Given the chance, PET
will try to return to near it's original shape which was a thin walled, sealed
at the far end, cylinder of plastic. If you weren't careful with the oven, you
could potentially bring the thing all the way back. </DIV>
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<DIV>What Jim is doing is a more controlled shrink down. Working with the
oven will work but takes more care.</DIV>
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<DIV> It may make some sense to fill the bottle halfway
with water, make sure the cap has a hole drilled in it and then stick
it in a pot of boiling water and cover but making sure the bottle doesn't
tip over. You want the internal pressure build up to be eliminated but you
also want thread protection. Boil it for some time and then see how it shrinks.
It will stress relieve and become stable quicker probably. Haven't done that
myself but could be worth a try. GL</DIV>
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<DIV>Matt</DIV>
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<DIV>In a message dated 2/16/2006 9:54:37 PM Eastern Standard Time,
brian_w_young@yahoo.com writes:</DIV>
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<DIV>Could you warm that material in an oven to acheive the same result?</DIV>
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<DIV>Maybe fill it w/ something to hold the shape but let it
shrink.<BR><BR><B><I>Rcmaster199@aol.com</I></B> wrote:</DIV>
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<DIV>Jimmy, pretty much all of those pop blow molded bottles are made of
PET. A fine, very tough and resilient engineered plastic with terrific
memory built in (beats heck out of my memory, fer shure). What you
experienced is completely expected.</DIV>
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<DIV>Matt</DIV>
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<DIV>In a message dated 2/16/2006 5:16:58 PM Eastern Standard Time,
jivey61@bellsouth.net writes:</DIV>
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<DIV>Wayne</DIV>
<DIV> I just flew the coke bottle tank today and I get 15 minutes on
24 oz of fuel.It actually draws fuel down to 1 oz in the tank,doing the
Masters pattern.</DIV>
<DIV>The upside is I don't have to fill it full to complete the pattern.
The weight savings is 2.5 oz using this tank.</DIV>
<DIV> To review...... this was a 33 oz, 1 liter coke bottle' that I
pickled with 30 % heli for 2 months.</DIV>
<DIV> </DIV>
<DIV>Jim
Ivey</DIV></FONT></BLOCKQUOTE></DIV></FONT></BLOCKQUOTE></FONT></BLOCKQUOTE></DIV>
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