A Little Wisdom Helps You Become Smarter !Salvaging Cracked Eucalyptus : Glue and Jack Repair for Plywood Production
In the video, A worker salvages a radially cracked log of fast-grown Eucalyptus 'Number 28', a species known for high growth stress that causes central splitting. Using a steel cable to bundle the log, a hydraulic jack for pressure, and a phenolic pad to distribute force, he forces the cracks closed. Low-viscosity industrial adhesive is poured into the fissures, penetrating deep under pressure to rebond the wood fibers.
After curing, the repaired log is not used as solid lumber but is sent for peeling—mounted on a lathe and rotated against a blade to shave it into continuous thin veneers. These veneers are then layered crosswise, glued, and hot-pressed into plywood.
Critical quality notes:
No defect transfer: The peeling process cuts through the original cracks and glue lines, dispersing them into tiny fragments within the veneer sheet. They pose no structural weakness in the final plywood.
No future cracking: The laminated structure of plywood, with alternating grain directions, inherently resists warping and splitting. The original log’s stress is eliminated when it is shredded into thin layers and reconstituted.
This efficient repair enables 100% utilization of defect-prone timber, turning wasted wood into stable, engineered panels for construction and furniture.
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