Reaction Wood Drying Kinetics: Tension Wood
In Fagus Sylvatica And Compression Wood In Picea Abies.
When cutting from the back, tension wood
may break suddenly and the tree will fall before you expect it, creating a "barber chair." The safest way to drop them is to bore into the trunk, parallel to and above the hinge, leaving the tension wood
intact, then cut back through the tension wood
Asymmetric hormonal distributions can promote the formation of compression wood in conifers and tension wood
They involved faces of tediously tapered Osage (compression wood) backed by desert hackberry (tension wood
), reflexed on a 24-inch radius, further reflexed (but not quite static) after splicing more hack-berry into the tips, the lighter material used to reduce weight and increase speed.
At the same time, the velocity in normal wood was higher than it was in tension wood
, and it gradually increased in normal wood as the radial distance increased from pith to bark.
The reaction wood of dicotyledonous angiosperms is called tension wood
and is produced along the upper sides of leaning stems and branches, causing reorientation by contraction on the upper side pulling the stem or branch back into a normal growth position.
is formed by woody dicotyledons to generate the force necessary for reorientation of branches and stems following gravistimulation or loss of apical dominance.
or brittleheart and interlocked grain can cause wooliness.
, present in hardwood tree species, is more difficult to machine than normal wood.
Problem areas, such as tension wood
, burls, and knots, and their effect on stress must be specifically considered.
For example, compression wood forms on the lower side of a leaning tree trunk or branches of softwoods, while tension wood
forms on the upper side of the leaning trunk and branches of hardwoods (Panshin et al.