Resin-clad Fibers (was: Industrial Chemists)

[John R Fortiner]

On Thu, 1 Jul 1999 22:46:39 -0400 Bill Ballard <yardbird@sover.net>
writes:
> At 2:28 PM -0600 7/1/99, John  R  Fortiner wrote:
> >Case in point - people in agricultural business use surfactants to 
> allow
> >sprays to be more easily absorbed by plant leaves - whether feeding 
> them
> >( the plants ) or trying to get rid of them  by use of herbicides.
> 
> Thanks for the big picture.
> 
> >> But if we're talking speed, steam leaves eveyone in the dust.
> >AND leaves NO residue - at least NEW residue.
> 
> What would steam residues be, the water's mineral content?
Repeat, again I say repeat after me, steam leaves no new residue as when
water is evaporated to become steam all, yes all minerals are left
behind.
btw That's why you can condense steam and end up with distilled water -
as pure as it comes.
> 
> >> All of this assumes that the water cure is the only way to 
> reclaim
> >>over-reinforced hammers.
> >And, if I understand even slightly correctly, the water works by
> >"resizing" the felt - hopefully "fluffing" it a bit.
> 
> You got it. Water expands the matted mass. Water+ heat (=steam) does 
> it
> even better..
No argument - I've been using steam for 4-5 years to soften hard hammers.
> 
> >Does acetone have any "sizing" effects on wool felt?????  I would 
> doubt
> >it - BUT I do know that it would certainly move waxes, oils, and 
> other
> >not-so-desirable things that are also found in wool.
> 
> I'm unaware of any direct effect of acetone on the felt matt or the 
> wool
> fibers. The acetone is brought into to disolve reinforcing 
> resins.Thank you
Understood, just don't forget the lanolin etc as you have mentioned
below.
> for the point that they would also displace lanolin and other of the 
> felt's
> "prescious bodily fluids"
> 
> >>What should happen is that the acetone should undo the gluing 
> together of
> >>fibers,
> >Gluing together??  with what - the reiforcing additive, or what was
> >holding the felt together before it was reinforced?  I am under the
> >understanding that the felt is not held together via a "glue", but 
> via
> >the "entanglement" of its own fibers.
> 
> You're correct about the felt mass and a matt of interlocked fibers. 
> But
> when resins are seeped into hammer felt, they do any of three 
> things. At
> first, they clad the fibers stiffening their resistence to elastic
> deformation..With more resins, fibers which touch or are very close 
> to
> touching get glued together by solid resin further stiffening the 
> mass. In
> extreme cases, so much resin can be poured in that the air spaces 
> between
> fibers is completely filled in,
I suppose you could consider this an extreme case of "filling the gap" as
pertaining to piano hammers.
by which time elasticity no longer 
> exists.
Kinda reminds me of a set of hammers on an old upright that someone had
actually varnished - and then the new owner wanted me to soften them.(
They were like rocks - and sounded like rocks.) No way could I get a
single needle into them.  Hammers were shot so new Abel hammers were
installed.  She couldn't believe it was the same instrument.  That's fun
when you can make that big a difference on a mid-classed instrument.

John R. Fortiner
Billings, MT.
> 
> Bill Ballard, RPT
> New Hampshire Chapter, PTG
> 
> "No one builds the *perfect* piano, you can only remove the 
> obstacles to
> that perfection during the building."    ...........LaRoy Edwards
> 
> 

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