摘要:
Techniques and products are described for coloring acetylated wood products. An acetylated wood product can be impregnated by a coloring medium within a chamber and the colorant or colorants contained within the coloring medium can be fixed to the acetylated wood product by the application of heat or by application of radio frequency radiation to color any external surface or interior region of the acetylated wood product which has been impregnated by the coloring medium.
摘要:
A commercial scale system and process for chemically modifying wood and then heating the chemically-modified wood. The system/process separates the chemical modification step from the heating step by utilizing two different vessels for the modification and heating steps. The system and process can, in certain situations, include a containment room for preventing escape of vapors from a chemical wood modification reactor, a wood heater, and/or a chemically-modified bundle of wood as the bundle is transported from the wood modification reactor to the wood heater.
摘要:
This invention relates to compositions for, and methods of, delivering treatment compounds to lignocellulosic substrates, wherein the solvent is recovered using RF energy.
摘要:
A microwave heater equipped with a microwave choke and suitable for heating wood under vacuum. The microwave choke inhibits leakage of microwave energy between a door of the heater and a main vessel body of the heater without causing arcing at the choke, even at low pressures. In certain situations, the microwave choke can be configured with side-by-side choke cavities. In certain situations, the microwave choke can be removably coupled to the door and/or vessel body for easier fabrication, installation, and/or replacement.
摘要:
A method for drying wood based materials includes applying a treatment including a first chemical, such as a solvent, to a wood based material. The wood based material is preheated using steam. At least part of an atmosphere is evacuated from around the wood based material. The wood based material is dried using heated using steam and is exposed to radiation to evaporate at least a portion of the first chemical.
摘要:
A process for the preparation of a modified wood product, the process comprising: modifying moist wood by subjecting the wood to microwave radiation having a microwave energy of from 100 to 4000 joules/cm3 and a frequency (f) of from 0.1 to 10 GHz for a period of from 0.1 to 100 seconds to form a plurality of cavities disposed in radial-longitudinal planes of the wood, at least some of the cavities being interconnected by channels in the radial, tangential and/or longitudinal directions of the wood, drying the modified wood; impregnating the modified wood with an adhesive component; and applying pressure to the impregnated wood to at least partially close the cavities and channels formed during the modification step and to adhere wood fibres with the adhesive component.
摘要:
A surface treatment process for improving surface properties of a timber as to wetness by exposing the timber to a plasma mixture of an inert gas and a reactive gas at a near atmospheric pressure. Prior to being exposed to the plasma mixture, the timber is treated to reduce a moisture content below a fiber saturation point of the timber so as to eliminate free moisture from the fibers of the timber which would otherwise lead to unstable plasma and therefore detract an uniform improvement over substantially the entire surface expected at the subsequent exposure to the plasma mixture. Thus, the plasma treatment can be effected in the absence of the free moisture to obtain a desired surface improvement uniformly across the surface of the timber, which gives an enhanced practicability of improving the surface properties of the timber, in addition to that the plasma mixture is generated at near the atmospheric pressures readily available without requiring substantial vacuum generating equipments.
摘要:
A peroxidic-initiated graft copolymerization process wherein a water-insoluble thiocarbonated or thiocarbamated substrate is exposed to high-frequency microwave energy in the presence of at least one ethylenically unsaturated monomer and a perioxidic free radical initiator.
摘要:
A synergistic aqueous wood preservative composition comprising a copper compound and penflufen. The copper compounds of the compositions of the invention may be soluble, partially solubilized or micronized particles. The penflufen of the compositions of the invention may be solubilized, emulsified or particulate. The wood preservative compositions of the present invention are surprisingly provided as stable dispersions and confer surprising and unexpected resistance to treated wood and wood products.
摘要:
A process is provided for treating wood products including lumber, plywood and other engineered wood products comprising the steps of applying an aqueous fire-retardant impregnate and applying a coating to the surface of the wood product. In one embodiment, said process confers fire-retardant properties to the wood products sufficient to pass the extended burn test of ASTM E-84. The present invention also provides fire retardant wood products.