Farm Forestry New ZealandKawa poplar timber - properties and market opportunities
Kawa poplar grading photographs
Small knot. Is this appearance degrade?
Small black knot
Small branch dying and causing black spike knot in quartersawn board
Pith. This was actively excluded from boards.
Pith surrounded by collapse. This only occurred in buttlogs.
Collapse. This was the highest level encountered (approximately 2mm), which was rare.
The top of the planting stake in a "pith" board.
Knot types common in headlogs.
Large green knot. Larger knots had higher levels of checking.
Large knot with checking.
Small bark encased knot.
Small black knot. Is this appearance degrade?
Cupping on flatsawn board.
Small "knots" that don't detract from the board's appearance.
Pruning wound "black" knots.
Debarker damage to board.
Knot checks.
Large pruning wound and associated bark encasement.
Split caused by pith.
Large spike knot with bark encasement.
Large spike knot with bark encasement.
Bark encasement in large knot.
Large knot check.
Large knot and associated check.
Typical structural grade board
Black knot on dressed surface.
The thirty 90x45 samples sent to Scion for mechanical testing (characteristic stiffness, density and strength)
Bow in the occasional structural board.
Serious crook resulting from air drying. This was not common.
Dressed boron treated framing boards.
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