Petrifying process of wood

[Delwin D Fandrich]

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From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of
Andrew and Rebeca Anderson
Sent: December 05, 2005 10:13 AM
To: Pianotech
Subject: Re: Petrifying process of wood 


Petrification involves mineralization, usually water-born.  Usually underground
where aerobic bacteria can't thrive.

A failed sound-board has more to do with structural compression damage to the
wood fibers.  Ie ten year old Chinese pianos with coastal spruce where the fat
grain has dried out and the board collapsed.  The wood has lost its "stiffness"
and absorbs vibrations much more than it did when new.  To a lesser degree this
happens to old boards.  Sometimes re-ribbing can revive a board.  Shimming
cracks that divide a board is another time-tested method.


 
... that does not work to either stiffen the original soundboard or to restore
crown.
 
Del
 
 

 
 


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