compression wood


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compression wood

[kəm′presh·ən ‚wu̇d]
(botany)
Dense wood found at the base of some tree trunks and on the undersides of branches.

compression wood

Abnormal wood formed on the underside of branches and leaning trunks of softwoods; usually lower in strength; has unusual shrinkage characteristics.
References in periodicals archive ?
It decreases rapidly in the juvenile wood portion and remains more or less stable in the mature wood portion, unless compression wood is present.
After tilting, conifers normally start to form a specialized wood at the lower side of an inclined trunk, so-called compression wood [25-27].
T 267 cm-05 Compression wood identification in pulpwood
In addition, there are limits on potential decay associated with knots, shake, splits, and compression wood.
Compression wood and spiral grain are also more prevalent in juvenile wood than in mature wood and contribute to excessive longitudinal shrinkage.
The variables analyzed were: the amount of compression wood produced, ovendry specific gravity (SG), modulus of rupture, and modulus of elasticity (MOE).
These trees tend to have relatively high percentages of juvenile wood and compression wood.
For the AAA grade, the tonewood board must contain no more than 85 percent quartersawn material, no defects, minimal spiral grain, fairly even grain lines, almost all white color, good stiffness, and no compression wood.
2: Permanent set of compression wood by low molecular weight phenolic resin and some physical properties of the products.
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.
Laboratory measurements were performed on sample discs at the before-mentioned heights from all sample trees for diameters, bark thickness, cross-sectional geometry, pith eccentricity, and extent of heartwood and compression wood, and on sample whorls (over-healed, self-pruned, and un-pruned) closest to the before-mentioned wood samples for the diameters and quality of knots at fixed radial locations (on the surface under bark and at consecutive 3-cm distances perpendicular to the stem axis).