JPH04201504A - Timber processing method - Google Patents

Abstract

PURPOSE:To manufacture a high quality product by means of an efficient process by heat softening a timber which is in the water saturated state in a high pressure processing vessel, pressing to force feed out the water content, and then releasing the pressed state in chemical liquid to allow the timber to suck the chemical liquid, pressurizing the inside of the processing vessel and injecting the chemical liquid into very fine sections. CONSTITUTION:A timber 6 in the water saturated state in fed into a processing vessel 1 and placed in a bottom force 10 of a press 3 and the processing vessel 1 is closed firmly, and then the timber 6 in the processing vessel 1 is heated by a heating means 6 and high pressure gas is introduce through a piping 8. When the timber 6 is softened, a top force 11 is lowered with pressure to press the timber 6 to generate the state in which air, water content and others are squeezed out. When chemical liquid 7 is injected into the processing vessel 1 through a liquid feeding pipe 5 and the pressed state of the timber 6 is released, the timber 6 is restored to the state before being pressed, and hollow sections are swollen and the chemical liquid 7 is sucked into the hollow sections to perform impregnation. After that, high pressure gas is introduced into the processing vessel 1 and the chemical liquid 7 is pressurized, and the chemical liquid 7 is further fed forcibly into very fine sections inside.

Description

[Detailed Description of the Invention] [Industrial Application Fields] The present invention is applicable to treatments such as flame retardant, antiseptic, insect repellent, mildew repellent, anti-termite, bleaching, and coloring by impregnating wood with chemicals, and strengthening by resin injection. This relates to a method for treating wood.

[Prior Art] In general, wood as a raw material has various drawbacks such as low rot resistance, insect resistance, heat resistance, and strength, and uneven color tone, which may be inconvenient for the purpose of use. Treatments include flame retardant, rot-proofing, insect-proofing, mold-proofing, termite-proofing, bleaching, and coloring by impregnating chemicals, and strengthening by resin injection.

Conventionally, the method of impregnating wood with chemicals is to place the wood in a sealed container, create a vacuum inside the container, actively remove air, moisture, etc. from the wood surface and inside, and then impregnate the wood into the container. Some methods impregnate wood by pouring the desired chemical into it, then applying high pressure inside the container to force the chemical to permeate into the interior of the wood.

[Problems to be Solved by the Invention] By the way, in the above conventional method, the inside of the container is evacuated to actively remove air, moisture, etc. from the surface and inside of the wood, but the air, moisture, etc. inside the wood are removed. If other parts are extracted by vacuum suction, it takes a very long time (several hours to several tens of hours), is inefficient, and has the problem of causing an increase in the cost of the product. In addition, when air is sucked out using a vacuum, it is extremely difficult to completely remove the air inside the wood, and the air remaining inside the wood adversely affects the penetration of chemical solutions, making it impossible to obtain high-quality products. The reality is that this is not sufficient to obtain high-quality products.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a method for treating wood that can be efficiently treated and produce high-quality products.

[Problems to be Solved by the Invention] In order to achieve the above object, the present invention involves placing wood in a water-saturated state in a high-temperature and high-pressure treatment container to heat and soften the wood, and pressing the wood. After pushing out the moisture and injecting and immersing the wood in the chemical solution, the pressed state of the wood is released in the chemical solution, and the chemical solution is sucked into the wood using the restoring force of the wood. To provide a wood processing method in which a chemical solution is injected into minute parts inside the wood by applying pressure.

[Function] According to the method of the present invention, the wood is saturated with water, heated and softened, and then pressed to forcefully extrude the moisture.
Air, moisture, and other substances inside the wood can be pushed out in a short time. In addition, since the pressed state of the wood is released in the chemical solution, the chemical solution is actively sucked into the interior by the restoring force of the wood, and in this state, the inside of the processing container is pressurized and pressure is applied to the chemical solution, so that the pressure inside the wood increases. The chemical liquid is pushed into the microscopic parts q and penetrates more completely.

[Example] FIG. 1 is a schematic configuration diagram showing an example of an apparatus for implementing the method according to the present invention, in which (1) is a high temperature and high pressure processing container, (2) is a heating means, and (3) is a high temperature and high pressure processing vessel. ) shows the press machine, (4) shows the preparation tank, (5) shows the liquid supply pipe, (6) shows the wood, and (7) shows the chemical solution.

The processing container (1) is a high-temperature, high-pressure container made of high-strength steel or stainless steel, and is equipped with a door (not shown) that can be opened and closed at the opening, and has a heating means (2) inside.
It is equipped with a high pressure (20 kg/kg) through piping (8).
cm2・G) of air and other gases are introduced inside,
In addition, internal drain etc. are discharged to the outside through the pipe (9).

The heating means (2) is constituted by a microwave heater or other heater, and heats the wood (6) contained in the processing container (1) to a high temperature (60 to 200°C).

The press (3) includes a groove-shaped lower mold (10) located vertically opposite to each other in the processing container (1), and a plate-shaped upper mold (1) that can fit into the lower mold (9). ) and a press cylinder (12) that moves one of these, for example, an upper die (11), in a reciprocating press motion in the vertical direction, and by pressurizing and lowering the upper die (11) with the press cylinder (12), ,
The wood (6) placed and supported on the lower die (10) is pressed.

The preparation tank (4) consists of an openable and closable sealed high-temperature and high-pressure container, and is placed above the processing container (1), in which a chemical solution (7) to be impregnated into the wood (6) is stored. is,
Pressurized air and other gases are introduced into the interior through piping (13), and chemical liquid (7) is introduced through piping (15).
is heated.

The liquid supply pipe (5) is arranged to communicate between the processing container (1) and the preparation tank (4) arranged above it, and the preparation tank can be opened by opening the on-off valve (14) provided in the middle. (4) Inject the chemical solution (7) stored in the processing container (1).

Next, the method for treating wood according to the present invention will be explained.

First, the wood (6) to be treated is saturated with water by appropriate means. This wood (6) is put into the processing container (1) and placed and supported on the lower die (10) of the press (3). Next, after closing the door of the processing container (1) and sealing the processing container (1), the wood (6) in the processing container (1) is heated using a heating means (2), for example, by microwave heating. for a specified period of time (several seconds ~
When the wood (6) is heated (several tens of minutes), the temperature of the moisture absorbed inside the wood (6) rises, thereby softening it. In addition, high-pressure gas is introduced through the pipe (8) to facilitate pushing out the air inside the wood (6). When the wood (6) is softened, the press cylinder (12) of the press machine (3) lowers the pressure on the upper mold (11), and the pressure from the upper mold (11) causes it to be placed on the lower mold (10). The wood (6) that is supported in the
As shown in the figure, pressing is performed so that the cross-sectional area ratio is approximately 172 to 1/3.

In this way, when the wood (6) is pressed with the press machine (3) so that the cross-sectional area ratio is about 1/2 to 1/3, the hollow part inside the wood (6) is finely compressed. At the same time, air, moisture, etc. contained in the hollow portion are pushed out, and the wood (6) becomes in a state in which air, moisture, etc. are squeezed out. After the moisture squeezed out of the wood (6) and accumulated in the processing container (1) is discharged through the pipe (9), pressurizing gas is introduced into the preparation tank (4) through the pipe (13). The preparation tank (4) is pressurized to the same pressure as the processing container [1], and at the same time, the on-off valve (14) provided in the middle of the liquid supply pipe (5) is opened to allow the liquid to be stored in the preparation tank (4). A chemical solution (7) whose temperature has been arbitrarily raised is injected into the processing container (1) through the liquid supply pipe (5).

Then, the wood (6) pressed by the press (3) in the processing container (1) is exposed to the chemical solution (7) as shown in
) to be immersed in In this state, use the press cylinder (12) of the press machine (3) to move the upper die (11) to the lower die (10).
If the pressed state of the wood (6) is released by lifting it away from the wood (6), the wood (6) will return to its pre-press state and the hollow inside the wood (6) will be removed, as shown in Figure 4. Since the portion expands, the chemical solution (7) is sucked into the hollow portion and the interior of the wood (6) is impregnated with the chemical (7). Normally, this allows the inside of the wood (6) to be impregnated with the chemical solution (7), but if necessary, if the wood (6) is pressed and released several times with the press machine (3), the wood (6) can be impregnated with the chemical solution (7). ) inside the chemical solution (
7) can be more impregnated. If the inside of the wood (6) is impregnated with the chemical solution (7) in this way, the treatment container (1
) through the pipe (8) to pressurize the chemical solution (7) in the processing container (1). Then, the wood (6
), and at the same time, if there is any air left in the wood (6), the pressure of the chemical solution (7) will force the air out, causing the wood to The chemical solution (7) can be more completely impregnated into the interior of (6).

As in the above example, the wood (6) is heated in a water-saturated state to soften it, pressed to forcefully extrude air, moisture, etc., and then immersed in the chemical solution (7). Release the press state and use the restoring force of the wood (6) to press the wood (6)
If the chemical solution (7) is sucked into the inside of the wood (6), and then the chemical solution (7) is pressurized in this state and forced into the minute parts inside the wood (6), the chemical solution (7) can be sucked into the wood (6). It is possible to achieve more complete impregnation in a much shorter time than conventional methods.

Figure 5 shows a modification in which the wood (6) is a log, which is processed in the same manner as the apparatus in Figure 1, and the same members as in Figure 1 are given the same symbols and explanations are omitted. .

In the above example, the wood is softened by heating it for a predetermined period of time when the wood is saturated with water (steaming (60 to 80°C) is recommended to make it saturated in a short time). Alternatively, for example, the wood may be softened by placing it in a high-temperature, high-pressure steam atmosphere for a predetermined period of time (several seconds to several tens of minutes).

Further, in the above embodiment, the wood is saturated with water by steaming, but the wood may be saturated with water by any other suitable method.

[Effects of the Invention] As explained above, according to the method of the present invention, when impregnating, bleaching, coloring, dehydrating, etc. the wood, the wood is heated in a water-saturated state to soften it. After pressing the wood to forcibly push out air, moisture, and other substances, the wood is immersed in a chemical solution, and then the press is released and the wood uses its restoring force to suck the chemical solution into the wood. Since the chemical liquid is pressurized and pushed into the fine parts inside the wood, processing time is significantly shortened compared to conventional methods, and the chemical liquid can more completely penetrate inside the wood, resulting in a high-quality product. can be obtained. Furthermore, when drying raw wood, drying efficiency can be greatly improved by heating and softening the wood using a similar method and then pressing it to completely extrude the moisture inside the wood.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of an apparatus used in the wood processing method of the present invention, and FIGS. 2 to 4 are explanatory diagrams showing processing steps. FIG. 5 is a schematic configuration diagram showing a modification of FIG. 1. (1)...processing container, (2)...heating means,
(3)...Press machine, (4)...Preparation tank, (
5)...Liquid supply pipe, (6)...Wood, (7)
...Medical solution. Patent applicant: Hisaka Seisakusho Co., Ltd.
Figure 1 Figure 41 Figure 5

Claims (1)

[Claims] (1) The wood is heated and softened by placing it in a high-temperature, high-pressure treatment container in a water-saturated state, and the wood is pressed to push out the moisture. After injecting and immersing the wood in a chemical solution, It is characterized by releasing the pressed state of the wood and sucking the chemical into the wood using the restoring force of the wood, and then pressurizing the inside of the processing container in this state to inject the chemical into the minute parts inside the wood. How to treat wood.