Process for the preservation of wood
AssigneeDiversified Wood Products, Inc.
InventorWilliam R. Allen
Life of this patent
Estimating the term…
Abstract
A process for the treatment of wood of all kinds to impregnate the wood fully to its core with a resin component system, simultaneously with, or without, a flame retarding agent, or preservative, the process involving enclosing the wood in a chamber, evacuating the chamber in which it is enclosed in a slow time cycle, related to the structure of the wood, while adding a prepolymer aqueous solution to submerge the wood, continuing the vacuum, securing the vacuum, and applying pressure of prepolymer solution until the wood reaches the refusal point and, in certain more dense woods, repeating the vacuum and pressure cycle; then completely purging the chemicals, evacuating the chamber and drawing a final vacuum on the wood for removal of surface liquid, and finally removing wood from the chamber.
Claims17
A process for the impregnation of wood with chemicals to the core of the heart wood of said wood which comprises,
- enclosing the wood in a chamber
- sealing said chamber,
- evacuating said chamber slowly, over a period of 20-30 minutes, to a level below 10 inches of mercury,
- admitting to said chamber sufficient liquid in the form of an aqueous solution of a resin prepolymer to immerse said wood,
- maintaining vacuum over said immersed wood for a period up to about one hour, to accomplish removal of moisture and volatiles from said wood,
- and to cause said solution to enter said wood, the end point of said condition being indicated by the cessation of any sound within the chamber,
- admitting an additional amount of said solution to said chamber and developing pressure in said chamber to the point of refusal of the wood to receive or absorb further liquid,
- removing liquid from said chamber,
- removing impregnated wood from said chamber.
Dependencies are inferred from the claim text.