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heartwood
In the cross section, in some tree species the dark one stands out in the middle of the wood trunk heartwood from the outside, bright Sapwood away. But not all trees produce real heartwood.
What is heartwood?
Heartwood is the wood inside the tree trunk, which has already died. The Dying of the wood is also called coring. Not all tree species are obligate coring and forming real heartwood out of. With some types of wood there is only a so-called false core. This often happens due to external injuries to the tree trunk. These types of wood are called facultative corers because they cannot form heartwood on their own.
Properties and uses of heartwood
Depending on whether it is real heartwood or fake heartwood, Different appearance, properties and possible uses.
Real heartwood
The internal, dead heartwood of a tree has a darker color than the surrounding wood. Real heartwood is particularly suitable for making furniture. Because the dead wood has one low water content and is no longer active. That's why it's easy to process and impresses with its longevity. Coreing not only makes the wood darker, it also makes it darker particularly strong and resistant against insects and fungal infestation.
false core
The wrong heartwood during optional coreing usually arises from external influences, for example if the tree is damaged. The wood is in Color and structure often less harmonious. The less homogeneous wood is therefore undesirable for some uses. The false heartwood is no less strong than the surrounding wood, but in contrast to the real heartwood it also has does not have increased durability.
Which types of wood have heartwood and which do not?
Not all types of trees can produce real heartwood. Tree species that generally produce heartwood are called obligate corers. Other tree species can only core due to external influences; they are called facultative corers.
Mandatory corers
Over time, mandatory corers naturally produce heartwood that has particular resilience and strength. Real heartwood trees are, for example
- Oak
- walnut
- Jaw
- Douglas fir
- Black locust
- elm
Facultative corers
With facultative corers, the wrong heartwood is created by external influences. This wood is often uneven in color and grain. It is therefore often classified as a wood defect. Facultative corers cannot produce real heartwood on their own. These include, for example
- bird cherry
- Ash
- Beech.
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