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Trees are made up of three parts: the canopy, the trunk, and the root. The trunk is the main source of wood. To increase the recognition ability of wood, we must start with the composition and structure of the trunk. Through the cross-section, radial-section and chord-section, we can understand the characteristics of the wood.
1. Cross-section: The section perpendicular to the trunk can clearly reflect the basic characteristics of the wood and is the most important reference surface for identifying wood.
2. Cut-off plane: A section parallel to the trunk and passing through the medullary heart. The radial plane sheet shrinks little and is not easily deformed.
3. Chord section: A section that is parallel to the trunk but does not pass through the medullary heart. The annual rings appear “V†shaped or wavy, and the general wood is a chord section.
When identifying wood, it must have standard three sections in order to fully understand the structure and properties of the wood; at the same time, if you want to understand the wood, you must understand the organization of the wood. From the cross section, you can see that the trunk is made of bark, forming layers, Composition of xylem and pith.
Bark: The outermost layer of the trunk, different tree species have different colors, thickness and appearance of the bark, so the bark is one of the very important basis for identifying the species of the log tree.
Formation layer: A thin layer of tissue between the bark and the xylem, which needs to be viewed with a microscope, is the source of wood formation.
Xylem: Within the formation layer are the wooden parts, which are the parts that we normally process.
The macro structural features of wood described above are wood characteristics that can be seen through the naked eye or magnifying glass, including annual rings, morning and evening materials, edge heartwood, wood rays, tube holes, intrusion bodies, resin steals, and axial parenchyma Wait. These features can all be used as direct tools for identifying wood, as shown in the table below.
Operators in the wood product processing industry must first have the ability to identify wood, because wood species and wood properties will directly affect the processing equipment, methods, and other content, such as the hardness of wood. The hardness of different wood species is the same, as long as the When they are distinguished, they can better choose processing methods and provide work results.
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