FI116514B - A method for producing weatherproof timber - Google Patents

Description

f 116514

METHOD FOR MAKING SUSTAINABLE TIMBER

The field of application of the invention is the production of weather-resistant low-cost timber mainly for yard construction and timber structures of building exterior structures.

5 The material is also suitable for quay structures and their decks.

At present, yard structures and furnishings are mostly made of impregnated wood, which is starting to be banned in most countries due to the toxicity of the impregnator, and also the wood is olderly produced as hazardous waste, which must be disposed of in hazardous waste incinerators.

It is an object of the invention to provide a method for making cheap wood material which withstands the effect of water damaging the wood and must not be toxic or emit toxic gases when burned.

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The object of the invention is achieved by a method characterized by what is claimed.

The wood material is generally filled by this process with a self-wax of a certain melting point (range) (ranges from 50 to 130 ° C). But unlike our application FI

20021245 waxes a lightweight foam into the spaces inside the wood raw material, which contains little wax but prevents water from being absorbed into the wood's internal structure: i.e., when solid, the foam forms a structure similar to foam: a plastic which is commonly used as a very long life floating material; ; 25 under the building sensors as insulation material. This method uses water and its: ', I steam as propellant.

The flotation process is done as follows: The lumber is first immersed completely in the sealed molten strong. Wax temperature, next raised slightly above normal. ·. 30 paints above the boiling point of water, for example 105 degrees, and boil so-called wood.

, *, remove the free water while allowing the steam to escape from the chamber. Thereafter, the temperature is allowed to fall close to the wax freezing point. In this case, the wood's:: * pores are filled with external wax due to the vacuum caused by the condensation of the water vapor. In the next heating step, the temperature of the wax and wood is raised well above the boiling point of the water, for example 130 degrees, whereby the bound water in the wood structure begins to boil to form a foam inside the wood. Bound water is the internal water of a tree that is loosely bonded to the molecules of the inner structure of the tree so that its boiling point is elevated relative to the boiling point of free water. When the treatment vessel is open, a substantial part of the wax is removed from the interior of the wood with the foam. Now you can separate the wood and the wax to get a light-waxed wood. In addition to this or in the position, the bound water is water dispersed in the substance to be impregnated, the boiling point of which has increased relative to free water. Dispersed water (in small drops, the boiling point of the water rises above 100 degrees due to the additional pressure exerted by surface tension, the more the smaller the droplets are) is used as a propellant to form a foam. The amount of wax remaining in the wood can be conveniently adjusted at the height of the first temperature increase, i.e. the higher the temperature the more wax remains in the wood. By increasing the pressure in the process, both latent and processing temperatures can be raised to make the material to be absorbed melt.

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Figure 1 is a schematic drawing of a treatment plant according to the method.

Next, Figure 1 illustrates the operation of the method to a practical level. Initially, the lumber 3 is introduced in a ribbed manner through the door 4 to the treatment chamber 2. The hot molten wax 20 is transferred from the container 1 to the wood surface via a boiler 5. Once chamber 2 is filled with molten wax, it is circulated through the boiler until ha-ν '. When the desired temperature of about 105 degrees has been reached, the evaporated free water is removed through valve 6. The temperature is then lowered, for example: "to 70 degrees, but above the melting point of the wax. Now, the external pressure is pushed by the external wax to replace the water vapor condensed in the wood. The second temperature increase occurs when the valve 6 is open / or wax: "': dispersed water to form wax foam and drive away too much wax from the inner structure of the wood. Then valve 6 can be closed and the wood can be made to - · dark by raising the temperature up to 200 degrees until the wood becomes Γ": 30 dark brown.

'. The invention is not limited to the disclosed application, but can be modified within the scope of the claims, especially with regard to meltable materials such as waxes, plastics, stearins, etc.

Claims (5)

A method for making lightweight weather-resistant, water-repellant lumber, which is prepared in a sealed basin (3) or in a container containing lumber (3) immersed in an impregnating agent, the heater being heated above a boiling point of water and the water in the wood is evaporated, allowing to cool below the boiling point of water and allowing the impregnating agent to be absorbed in place of the water vapor condensed in the wood, characterized in that after cooling, the impregnating agent is circulated through the heating boiler (5) the temperature at which the material inside the wood foams and some of it comes out of the wood and some remains to coat the inside surfaces of the wood to withstand the weather. 15 Method according to Claim 1, characterized in that the bound water is the internal water of the tree, which is loosely bound in the molecules of the inner structure of the tree so that its boiling point is elevated relative to the boiling point of free water. 20th v. The method according to claim 1, characterized in that the bound water is. : water dispersed in an agent to be impregnated with a boiling point higher than: free water. 3, 116514 Method according to claim 1, characterized in that the material to be absorbed is a hydrophobic material such as plastic, paraffin or stearin. . A process according to claim 1, characterized in that, by increasing the pressure in the process, both the latent and the treatment temperatures are raised to melt the substance to be absorbed. 4, 116514