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.
Fuzzy grain may occur due to the presence of tension wood
often present in branch wood.
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.
This research measured cutting forces for frozen green wood, green and dry normal wood, and green and dry tension wood
of sugar maple (Acer saccharum Marsh.
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.
length 300 mm Growth Even Not restricted Tension wood
(% percent of the length) Not allowed Max.
The samples contained no obvious signs of defects or tension wood
and were taken far from the pith of the tree.