Posted by carl Jones on February 27, 2000 at 11:08:55:
In Reply to: Calculations? posted by Judi B on January 20, 2000 at 11:55:41:
: I am trying to use a steam autoclave to increase the moisture content of wood veneer. Is there a way to calculate the amount of water going into the wood given the pressure of the saturated steam?
You might try looking with TAPPI in Atlanta Georgia. They have develpoed a great deal of information for
use in woods industry. The other alternative would be to take a sample of the wood prior to charging the
autoclave and another from the same board after charging. The using a standard labratory mositure analysis
process determine % moisture. A rough calculation of the percent could be made by simply taking the sample
piece prior to charging in the autoclave and weighing it, heating the board to 300 to 400 degrees in an oven and
monitoring the weight loss until it stabilizes. Don't heat to a point where H2 and other volitales would
be driven off. Then take another sample from your specimen from the autoclave at periodic stages and do
the same testing. In this fashion you could come close to approximating % moisture. This is a dirty way to do it.
However its been almost 25 years since I worked in the lumber industry. I do remember that % moisture was
taken from dimensional lumber dryed in the standard kiln. Just a question though, why are you forcing mositure
into the boards? Does your process steam also include some sort of preservative impregnation? If so, heating
as mentioned above may be a poor choice.
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