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Author Topic: Banding or Weights for Lumber to be Dried  (Read 4751 times)

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Offline old3dogg

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Re: Banding or Weights for Lumber to be Dried
« Reply #20 on: March 25, 2004, 12:42:14 PM »
jimF.
What if one was to pre-heat in a vac kiln before he pulls a vacuume?Would this not bring the whole piece of wood up to the same temp?

Offline jimF

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Re: Banding or Weights for Lumber to be Dried
« Reply #21 on: March 25, 2004, 02:05:07 PM »
yes, and the whole piece should loss water some what evenly.  But not all the water.  So the concern is after the initial vacuum pull, how is it heated?  With intermittant heating system mentioned here, it seems like this would happen each time, but with repeated occurances things can become complicated quickly.  Which is why I hold back my opinion in this instance.

Offline jimF

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Re: Banding or Weights for Lumber to be Dried
« Reply #22 on: March 25, 2004, 02:07:03 PM »
To stir the pot some, what are the concerns during drying - in all systems of drying?

Offline old3dogg

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Re: Banding or Weights for Lumber to be Dried
« Reply #23 on: March 25, 2004, 02:45:10 PM »
jimF.
With square drying in a vac kiln the concern was honey comb and surface cracks.In flooring blanks and lumber the concern is with stress and un even moisture content.
Also in vac drying some people complain about the sap wood being to bright and the MC being to low.
There was a problem with bow in vac dried squares but that is an easy problem to fix.

Offline old3dogg

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Re: Banding or Weights for Lumber to be Dried
« Reply #24 on: March 25, 2004, 02:52:21 PM »
I may also add that in the last 2 weeks I found that stress is not that big of a deal in vac dried lumber.


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