This picture tell all inside the fiber there is air like a sponge... Serge Harel Hammer Maker 2011/2/14 <PAULREVENKOJONES at aol.com> > Having sent those, I, as you, am not convinced that "holding water" or > other solvents expands the felt, or whether the "sidewalls" of the fibers > absorb solvents and expand. We'd need another series of pics which are > before and after treatment with various solvents. > > Paul > > In a message dated 2/14/2011 7:23:05 P.M. Central Standard Time, > fssturm at unm.edu writes: > > On Feb 13, 2011, at 8:40 AM, Dale Erwin wrote: > > I'm curious. I learned from Jack Brand (during the Weickert felt trials) > at Wurzen felt that wool fibers are hollow, which is why they can hold so > much moisture. ie rugs, sweaters etc > > > This statement caught my eye, and has made me wonder. Are wool fibers, in > fact, hollow? I sort of doubt it, but I don't know. Does anyone actually > know for certain? > My take on wool absorbing water is not that there is a "hollow spot inside > to hold it," but that the wool fibers themselves (that is, the material > itself of the fibers, the proteins I suppose) "attract" and "absorb" the > water (quotes because I'm sure there are scientific terms for these things > that I don't happen to know). Kind of like the protein in gelatin, or in > hide glue. In any case, the individual fibers do swell in the presence of > water - I am pretty certain of that. In swelling, they spread out their > little scales so that those will tend to interlock with the scales of other > fibers, all of them being pressed more tightly together because the space > between them is taken up by all of them swelling, if they are constrained in > some way (as in center bushing felt, for instance, constrained between the > pin and the wood). This is a part of the felting process. > Do they swell with lacquer, or the various solvents associated with it? I > don't think so. In any case, drenching hammers in lacquer thinner, acetone, > or alcohol doesn't seem to make them expand, or leave them larger than > before. Water does make them expand and they end up larger than before. > So I don't think we know whether the solids in lacquer penetrate the wool > fibers when we dope hammers. I have always pictured it as coating the > fibers. And have wished that someone would do electron micrography on > lacquered hammers so we could see. > Regards, > Fred Sturm > fssturm at unm.edu > http://www.youtube.com/fredsturm > > = > > -- phone 514-750-4522 cel 514-569-4414 Piano Perfecto 5932 rue Viau Montreal Qc Canada H1T 2Y4 Atelier ( Piano Shop) 2177, rue Masson, bureau 211 Montréal, (Québec) H2H 1B1, CANADA -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/caut.php/attachments/20110214/617f9563/attachment-0001.htm> -------------- next part -------------- A non-text attachment was scrubbed... Name: FELT-HOT-COLD-450X.jpg Type: image/jpeg Size: 159015 bytes Desc: not available URL: <http://ptg.org/pipermail/caut.php/attachments/20110214/617f9563/attachment-0001.jpg>
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