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Date: Mon, 04 Mar 2002 19:50:18 -0500
From: Richard Biow
Subject: Teflon

I asked Douglas Tate to look this over, and he gave me his
"imprimatur."

- --

I wonder, after cogitating over your excellent explanation if the
way to describe the attachment of a Teflon reed to a plate is to say
that nothing "glues" it in place (in terms of surface-adhesion) as is
the case with a conventional plastic valve and - say -- Pliobond.

Your point that a mechanical bond is needed, would seem to mean that
the valve is held in place the same way it would be held if it were
"stapled" or "riveted" in place -- the glue squeezed past the hole and
in the valve you described widens so as to form a sort of rivet-head,
right? And the roughening of the plate must create different
"valleys," slanting down at different angles, thus gripping the
hardened glue. And of course, if the glue expands a bit when hardening
. . .

- --

Thanks Douglas!

- --

It would be nice if the already excellent material on Teflon valves in

http://www.angelfire.com/music/HarpOn/

- -- included an explanation of the extra care involved and precision
needed in attaching Teflon valves, the requirement for precise
alignment, etc.

( And BTW, I can see why mass producers don't use Teflon: they'd
probably have to charge too much for additional labor.)

Dick Biow