veneer Permeability qc,quality control,quality assurance,inspection,checking,sourcing,factory auditing,import,export,manufacturing

Permeability has a distinct effect on veneer cutting, drying, and gluing characteristics. Sapwood is often more permeable than heartwood of the same species. Bacterial attack in log storage may increase the permeability of wood, thereby changing its cutting characteristics. Wood that is permeable is easier to cut because water is readily forced from the wood; forces that could rupture the wood do not develop. Furthermore, plywood made from veneer that is naturally permeable, such as yellow-poplar, is less subject to “blowout” in the hot press than plywood made from such relatively impervious veneer as spruce. Extremely permeable veneer, such as the sapwood of pine that has been attacked by bacteria, may require a heavy glue spread or changes in gluing techniques to obtain satisfactory bonds.

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