Method for drying wood material
AssigneeAsahi-Dow Limited
InventorsTamotsu Kai, Michio Tsurumi, Takashi Sakakiyama, Kunihiro Horiuchi
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Abstract
A dry wood material free from seasoning check is produced with good yield from undried wood material with water content of 50 to 200% by drying the undried wood material while controlling the rate of evaporation of water from the undried wood material by providing on its surface a barrier layer having a water vapor permeability in the specific range from 10 to 100 g/m.sup.2.day.
Claims22
A method for drying a wood material, which comprises drying an undried wood material having a water content of from 50 to 200 wt.% while controlling the rate of evaporation of water from said wood material by providing on the surface of said wood material a continuous polymeric film barrier layer having a water vapor permeability in the range from 10 to 100 g/m.sup.2.day (as measured under the condition of the relative humidity of 90% at 37.8.degree. C.).
A wood material controlled in the rate of evaporation of water from the surface thereof, comprising an undried wood material having a water content of from 50 to 200 wt.% and a barrier layer provided on the surface of said wood material in an amount of 10 to 200 g (dry weight) per square meter of the surface area, said barrier layer being a continuous polymeric film having a water vapor permeability in the range from 10 to 100 g/m.sup.2.day (as measured under the condition of the relative humidity of 90% at 37.8.degree. C.).
Dependencies are inferred from the claim text.