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3. Wood Processing and Humidification
Making the wood fit!
A natural material such as wood must be processed and stored at a certain air humidity. If the wood is too wet it will swell, if it dries out it will distort. The dimensional changes are not equal in all directions, however: the wood swells or shrinks tangentially more than radially. If the amount of water in the wood varies, these unequal dimensional changes will lead to deformation and cracking.
A constant, optimum air humidity prevents:
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If the air is too dry, the wood will discharge its own material humidity to the air: during the heating season, in particular, a reduction to levels below 40 % relative air humidity entails an acute risk of damage to the wood both in storage and in every phase of processing.
The use of water-soluble paints and varnishes, too, demands a constant room humidity in order to avoid adhesion problems.
An active air humidification plant can effectively prevent avoidable costs resulting from excessively dry heated air.
