Abstract: An agent for impregnating solid wood by the pressure process, based on a water-dilutable formulation of a copper salt, excess alkanolamine and, if required, a salt with a fungicidal anion, has a pH of not less than 8 in the concentration usually employed and corresponding to about 1-5% by weight of non-aqueous components in the aqueous solution.

Abstract: A shake fabricating process for producing roofing shakes from wood is provided. In accordance with the process a log is stripped of its bark and cut into bolts having a preselected length corresponding to the desired length of the shakes to be produced. The bolts are then cut in half, or in quarters, longitudinally to produce bolt sections which are, in turn, cut into boards having a preselected thickness. A plurality of longitudinally oriented grooves are then cut into the upper and lower surfaces of the boards to give the surfaces the appearance of being hand split, and the boards are cut diagonally from end to end to produce a pair of shakes which decrease in thickness from their first end portions to their second end portions. In order to achieve the desired wood colorization the shakes are then placed in a pressure treating chamber and a first vacuum is generated in the chamber for a preselected time period in order to draw a liquid pigment into the chambers.

Abstract: Wood preservatives which are based on a zinc compound and an aliphatic carboxylic acid and additionally contain a polyamine and processes for preserving wood with these preservatives.

Abstract: According to the invention, a method of modifying wood comprises the steps of impregnating wood with a modifying system, d drying the impregnated wood in a hydrophobic heat transfer agent, and curing the impregnating system in the wood, the drying and curing processes being carried out in the same autoclave and with the same hydrophobic heat transfer agent, while raising the temperature of the heat transfer agent from 40.degree. to 140.degree. C.

Abstract: Water-borne preservative salts are used to impregnate wood by the empty-cell pressure impregnation method without the precipitation of water-borne salts such as chromium, copper and arsenic when wood sugars enter the treating solution during the kickback or pressure release phase of the empty-cell cycle. The lack of precipitation is obtained by maintaining the preservative salts solution at a temperature between about 40.degree. F. and about 70.degree. F.

Abstract: Disclosed is a method for the chemical treatment of woods, which comprises introducing a chemical solution into a pressure vessel charged with wood so that the wood is entirely dipped in the chemical solution, heating the chemical solution to a temperature within the range not causing high temperature troubles in the wood, and elevating the pressure in the pressure vessel above the saturated steam pressure to cause the chemical solution to permeate into the wood.According to this method, the chemical permeation treatment can be accomplished in a very short time at a low temperature not causing high temperature troubles in woods. Furthermore, the preliminary boiling treatment, which is indispensable in the conventional method, can be omitted.

Abstract: An improved process for the drying/coloring of wood is disclosed wherein the wood is contacted with a drying/coloring oil. At least the outer surface layer of the wood has a moisture content in excess of the fiber saturation point of the wood. The treatment process is carried out until the moisture content of the wood decreases below the fiber saturation point.

Abstract: A tank having a hinged top and sealing means is provided with a series of heaters mounted on the inside of the front, rear and side walls and also the bottom of the tank. A rack containing fiberboards placed in upright, spaced position is set on the bottom heaters and a solution of solvent and asphalt or the like is pumped into the tank, then removed. The top of the tank is sealed and a heating medium is pumped through the heaters, while a vacuum pump is started to produce a vacuum inside the tank and suction exerted for evaporating solvent. One or two condensers, between the tank and the vacuum pump, condense the solvent vapors for collection and reuse. With one condenser, an excess condensate tank is connected to the lower condensate section of the condenser. A valved pipe connecting with the pipe between a lower condensate section of the condenser and the vacuum pump is utilized to bleed air into the tank after treatment and may be used to control the initial vacuum applied.

Abstract: A method and apparatus for impregnating low density fiberboard with asphalt is disclosed, and which includes stacking the sheets, placing the stacks in a sealable chamber, and flooding the chamber with a treating solution composed of a mixture of asphalt and solvent. The chamber is thereafter drained, and the fiberboard is then heated by the injection of live steam into the chamber. A partial vacuum is then drawn in the chamber, while condensing and separating the withdrawn solvent and water vapors. Both the condensed solvent and water of the steam injection system are maintained in closed conduit systems to permit their reuse and to prevent contamination of the environment.

Abstract: The present invention relates to a process for preserving wood, in particular hardwoods, against attack by living organisms, e.g. fungi and insects, which destroy wood. In particular, the present invention provides a one or two step process for preserving wood against fungal and/or insect attack. The fungicide treatment step comprises introducing a copper solution or a copper solution into wood. The insecticide treatment step comprises introducing a chromium and arsenic solution into wood. If the pH of the wood system is controlled, both steps may be carried out simultaneously so as to preserve the wood against fungal and insect attack. Alternatively, the insecticide treatment step may follow the fungicide treatment. Where only protection against fungus is desired, the process comprises introducing copper and arsenic solution into wood. On the other hand, if only an insecticide treatment is required, the process comprises only the abovementioned insecticide treatment step.

Abstract: A combined water repellent and preservative for wood prepared in a concentrate for mixing with water and utilizing 3-iodo-2-propynyl butyl carbamate.

Abstract: An improved wood preservation process is disclosed wherein wood is contacted with an emulsion of an oil-based perservative in water.

Abstract: A process for the treatment of wood is disclosed in which water-borne wood treatment materials, such as CCA salts, are forced into the wood under pressure and the water-borne wood treatment materials are held within the wood under pressure until they are deposited as by precipitation or chemical affixation. The precipitation or chemical affixation step is conducted at elevated temperatures. The elevated temperatures may be established by heating the wood treatment materials while they are in contact with the wood, by draining the wood treatment materials from external contact with the wood, while maintaining a sufficient pressure to prevent kickback and heating the wood as by steaming or by submerging the wood in a heated aqueous bath. If a heated aqueous bath is used it may advantageously contain additional wood treatment materials such as wood-softening agents, antichecking agents, filmformers, coloring agents, dimensional stabilizers, flame-retardants, antistatic agents and the like.

Abstract: A process for flameproofing wood is claimed, which comprises treating the wood with aqueous preparations which contain(a) at least one water-soluble ammonium salt of a non-volatile inorganic acid, e.g. ammonium sulfate or ammonium phosphate,(b) at least one water-soluble cationic reaction product of dicyandiamide, formaldehyde, optionally an ammonium salt and/or an alkylenepolyamine containing at most 18 carbon atoms, or the acid salt thereof.Components (a) and (b) are applied in succession or preferably simultaneously and the wood is subsequently dried. The flameproof finish obtained is resistant to rinsing. The wood provided with the flameproof finish is used in particular as mine timber.

Abstract: An improved method for the preservation of hardwood by treatment thereof with a preservation solution is disclosed. The wood is treated with a preservative solution which is not readily fixed and is then kept in an undried condition for a period of time sufficient to allow the preservative solution to penetrate the wood and diffuse through the cell walls of the wood without fixation thereof. The wood is then dried so as to fix the preservative. Enhanced periods of preservation effectiveness are thus obtained.

Abstract: An anti-blooming flame retarder consisting essentially of a water-soluble flame retardant agent and a water-soluble polymer, which is particularly suited for use in treating improved woods such as fiber-boards and plywoods. The improved woods are treated with the anti-blooming flame retarder and heat-treated.

Abstract: The present invention provides a process for the treatment of wood material impregnated with an aqueous ammoniacal solution of water-insoluble treating chemical and having deposits of treating chemical on its surface. The process comprises submerging the impregnated wood material in the ammoniacal solution, separating the wood material from the solution and maintaining it in a moist, ammoniacal atmosphere until the wood surface is substantially free of liquid. In another aspect, this invention relates to a process for producing wood material treated with the ammoniacal solution, where the product has a clean surface.

Abstract: A process for treating wood consisting of boiling the wood in a solution containing alkylamine and then transferring the boiled wood to an autoclave where an alkylamine permeating solution is forced into the wood under the conditions of pressure and heat. The wood is then dehydrated under reduced pressure and is then air dried.

Abstract: A method and apparatus for treating timbers, such as railroad ties and the like, which comprises at least one pressure sealed tube or pipe filled with the treating fluid normally utilized for treating timbers, and of a size for receiving the timbers in sequential end-to-end relation for longitudinal movement therethrough. The timbers are initially loaded into the treating pipe through one end thereof from a movable tube containing a single timber therein, with the single timber being ejected from the movable tube into the treating tube by a suitable ram member, such as a hydraulic piston. As timber after timber is introduced into the fluid filled treating pipe, each timber pushes the preceding timber longitudinally through the pipe and the timbers absorb the treating fluid during the longitudinal passage through the filled pipe.

Abstract: What is disclosed is a method of fabricating wood composite panels having enhanced fire retardancy. The panels so fabricated have hard, durable finished surfaces which allow machine finishing without the concurrent loss in fire retardancy due to the finishing operation.

Abstract: A process for treating wood which process comprises boiling the wood with a solution containing a surface active agent and an alkali, shifting the boiled wood to a pressure boiler, permeating the surface active agent and dilute alkali solution forceably into the wood under the conditions of pressure and heating, dehydrating it by applying reduced pressure to the wood, air drying or kiln drying the wood so treated.

Abstract: A method for producing clean surface treated wood by subjecting the wood, containing the treating agent and its carrier, to steaming under pressure thereby to cause the solvent in the atmosphere about the wood to condense on the wood surface during the steaming, thereafter reducing the pressure to about atmospheric pressure, removing the carrier vapors from association with the wood as they form, and continuing the steaming until the carrier is substantially removed from the wood.