End cracks when using Wood Chip Dryer

End split (split or longitudinal split):Wood Chip Dryer the wood end is dry first because the water evaporates faster. When the end water is lower than the fiber saturation point,Wood Chip Dryer the end cells begin to shrink. When the dry shrinkage stress reaches the wood At the limit of strength, end fissures occur,Wood Chip Dryer that is, longitudinal cracks occur at the medulla or rough wood rays or along the outer panel surface. The end-fracture along the medullary heart is almost irreversible,Wood Chip Dryer because the medullary heart is the most concentrated center of ray parenchyma cells,Wood Chip Dryer and the lateral tensile strength is extremely low. Thick broad-leaved hardwood slabs are also more prone to end cracks. Regarding the burrs with a length of several meters,Wood Chip Dryer end cracks within 10 cm to 15 cm are allowed, because partial ends are always cut off during processing. However,Wood Chip Dryer with regard to the whole-edged board or floor blank, end cracking is generally not allowed.

The following measures can be taken to avoid end cracks: ① If allowed,Wood Chip Dryer it is best to reshape thick plates into thin plates or small square bars to stop the dryness. It is most reasonable to effectively avoid end cracks and other dry defects. ② Partially cut off the existing end fissure before kiln drying,Wood Chip Dryer because the original end fissure is easy to continue to extend. ③ Paint paraffin oil or thick paint on the end of the wooden board without end cracks,Wood Chip Dryer and the barrier moisture will evaporate from the end. ④ When stacking, the spacers at the ends of the timber stack should be pressed as close as possible to the ends and aligned up and down. ⑤When loading the kiln,Wood Chip Dryer the ends of the material pile and the material pile should be as close as possible to avoid short circuit of the air flow from the gap between the material piles,Wood Chip Dryer so as to avoid the end being too dry. ⑥ For hard broad-leaved wood or thick plates that are prone to end cracks,Wood Chip Dryer use a soft and dry process as much as possible, and pay attention to stop the humidity adjustment in time.