Detail Explain The Softwood And Hardwood
Visit the Woodworking Plans Website pages for more woodworking articles.The type and shape of a tree"s leaves are more accurate indicators of a particular wood"s identity. Softwoods include evergreen conifers with needle-like leaves, while hardwoods comprise broad-leaved deciduous, or leaf-shedding, trees. But it is at the microscopic level that the true differences between softwoods and hardwoods can be seen. Softwoods are composed mainly of tracheids, dual-purpose cells which conduct the sap up through the trunk and provide support. Hardwoods, which are believed to have evolved later, have narrower thicker-walled fiber cells for support and large-diameter thin-walled vessels for sap conduction, These cells determine the texture of a tree"s wood.
In spring, when there is abundant moisture and rapid growth of early wood, the tracheid cells in softwoods have thin walls and large cavities to conduct the sap. The result is relatively porous wood. As late wood develops in the latter part of the growing season, the tracheids begin to form thicker walls, creating denser wood.
In hardwoods such as oak or ash, most of the vessels develop in the early wood, resulting in uneven grain. These species are called ring-porous. With diffuse- porous hardwoods such as maple, the vessels are distributed more evenly in the early wood and late wood. Some species, such as walnut, exhibit a more gradual transition from early wood to late wood and are termed semi-rineporous or semi-diffuse-porous.
The differences in cell structure between softwoods and hardwoods become apparent when a stain is applied. In softwoods, the light, porous early wood absorbs stain more readily than the dark, denser late wood-in effect reversing the grain pattern like a photographic negative. Hardwoods, however, absorb stain more evenly, enhancing the grain pattern.
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