Method of performing an impregnating or extracting treatment on a resin-containing wood substrate
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United States of America Patent
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Sep 23, 2003
Grant Date -
N/A
app pub date -
Jun 18, 2001
filing date -
Nov 10, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In impregnating or extracting treatments of resin-containing wood substrates using a resin-soluble supercritical fluid as delivering or extractive solvent medium problems due to exudation of resin from the wood substrate at pressure release necessary before the termination of the treatment are avoided or reduced by a controlled pulsating pressure release down to atmospheric pressure. Thereby the total process time can be substantially reduced.
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