[ExI] plastic turkeys

[William Flynn Wallace]

TMI    bill w

On Thu, Nov 19, 2020 at 5:58 PM spike jones via extropy-chat <
extropy-chat at lists.extropy.org> wrote:

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> >>…Regarding the seams on your shampoo bottle and milk jug, what did you
> see?
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> spike
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> > *On Behalf Of *William Flynn Wallace via extropy-chat
> *Subject:* Re: [ExI] plastic turkeys
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> >…See?  Nothing that I can make sense of.  bill w
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> If you put that seam under a microscope, it would look like a ridge but
> not a groove.  This is important, for that seam is the site on which two
> similar mold halves were fused together.  The reason that is important is
> that there is more material along the fusion site than elsewhere, for that
> process of fusing the two pieces after the initial thermal-setting does not
> create the same number of bonds as the initial injection mold process.
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> If you take an empty milk jug, fill it with water, take it out in the
> front yard and hurl it into the air, good chance it will not rupture.  You
> will come away with new respect for ABS: marvelous stuff.  But if you take
> it up to the fourth floor and hurl it to the ground, it will rupture.  If
> those seams did not contain extra material, the jug would rupture into two
> halves along that seam.  So… they compression-fuse it in such a way that
> there is more material on the seam.
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> Next, note that the two fused pieces are mirror images.  This is done for
> a reason.  If a weak spot from stress concentration in one side is
> discovered, the other side has that too for the same reason.  Both can be
> fixed by the same process.
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> Lesson: there is a lot of science in ABS plastic.  The guy who designs the
> mold to create those plastic turkeys has a great job.  She gets to use
> science and engineering in her job every day.
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> spike
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