the end of drying. This treatment, using
about 15% EMC in many cases, is called
conditioning. It is discussed in detail
in most drying texts, so is not repeated
here. The daily high humidity in air
drying just before sunrise does relieve
most casehardening is air dried lumber.
QWe are experiencing break- age in walnut cut-to-size chair legs. A “normal” piece
of walnut bends a lot and
takes a lot to break. When it does break,
it “shatters” with rough, splintery ends.
What we are experiencing is that some
parts that break far easier and the
break is far cleaner somewhat like honeycomb in a bee hive looks and straight
across. Can you advise any information
as to what we have going on here?
AYour description makes it easy to identify this wood as “brash wood.” There are basically three causes of
this wood -- two are natural within the
tree and one is man-made.
The first cause is wood that is much
lighter in weight than normal for
the wood species. This light weight is
caused by very slow growth in porous
woods like oak, hackberry and ash.
With slow growth, there are more
pores with air space instead of solid
wood. Light weight is also caused by
the formation of tension wood (
hardwoods) or compression wood (
softwoods) within the tree. In hardwoods,
tensioned wood leads to excessive fuzzing. In softwoods, compression wood
is identified by color and wider than
normal growth rings. ;
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“Drying stresses will cause immediate warp when
machining wood, but cause no other problems.”