JPH0760711A - Method and apparatus for toning wood - Google Patents

Abstract

PURPOSE:To perform the discoloration and toning of wood in a single process by circulating a discoloring soln. containing a reducing agent within a high temp. and high pressure container having a wood pressing device under heating and pressing wood to push out the discoloring soln. and subsequently depressuringing the wood to infiltrate a toning soln. containing an oxidizing agent into the wood while circulating the toning soln. under heating. CONSTITUTION:Wood 1 is placed and supported on the receiving stand 16 of the press machine 4 in a high temp. and high pressure container 2. The container 2 is hermetically closed and evacuated through an exhaust pipe 5 to be internally brought to a vacuum state to extract the air in the wood. A discoloring soln. (a) is supplied to the container 2 from a discoloring soln. tank 3a to immerse the wood 1 in the discoloring soln. (a). The discoloring soln. (a) is circulated by the operation of a heating and circulating device 11 while heated by a heat exchanger 10 to discolor the wood 1. After the discoloration is completed, the discoloring soln. is drained and the wood 1 is pressed by the press machine 4 to push out the discoloring soln. (a) and the wood 1 is immersed in the toning soln. (b) supplied after the discoloring soln. is drained. The toning soln. (b) is sucked into the wood 1 by the restoration force of the wood. Therefore, discoloration and toning can be performed in the container 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for toning wood, especially wood containing a core material or wood having a blackish tone.

[0002]

2. Description of the Related Art The core material of wood is reddish black and is generally called "Akata". It is rarely used as a high-grade member such as furniture, and is used as a building material or a member not on the surface. However, the core material is always present in each piece of wood, and even if sufficient consideration is given to wood removal, this part is included to some extent. Particularly, for high-grade tree species, from the viewpoint of improving the yield, it is desired to develop color matching technology in this part.

At present, wood containing "Akata" has a low utility value as it is, and when used, it is bleached with a high concentration of a chemical such as hydrogen peroxide or chlorine and then painted to a desired color. It has been dyed.

[0004]

[Problems to be Solved by the Invention] By the way, "Akata"
At present, when using wood that contains bleach, painting and dyeing are performed after bleaching, but it is difficult to bleach completely evenly, and it takes a lot of time and cost to match the color tone, and additional equipment. And highly skilled technicians are needed. Furthermore, since a high concentration of chemicals is used for bleaching,
There is a drawback that the chemical remains in the wood and the color changes (changes with time) by reacting with paints and dyes used for toning over time.

Therefore, an object of the present invention is to provide a wood color-matching method and apparatus which can solve the above problems.

[0006]

In order to achieve the above object, the present invention achieves the above object by heating and circulating a decolorizing solution prepared by mixing a reducing agent at a predetermined ratio in a high temperature and high pressure vessel having a pressing device. After heat-treating for a predetermined time, press the wood with the press machine to extrude the decolorizing liquid inside, and then use the restoring force while depressurizing the wood to mix the oxidizer and the dye in a predetermined ratio. There is provided a method for adjusting the color of wood, in which the prepared color adjusting liquid is sucked in, and the color adjusting liquid is heated and circulated in that state to perform heat treatment at a predetermined temperature for a predetermined time.

Further, the present invention provides various treatment liquids such as a decoloring liquid in which wood is contained and a reducing agent is mixed in a predetermined ratio, and a toning liquid in which an oxidizing agent and a dye are mixed in a predetermined ratio. The high temperature and high pressure container to be supplied, a heating circulation device for heating and circulating various processing liquids in the high temperature and high pressure container, and a press device for pressurizing and depressurizing the wood in the high temperature and high pressure container. The various treatment liquids supplied to the above are heated and circulated by the above heating and circulation device to heat and soften the wood, and the heat and softened wood is pressed and depressurized by the above press device to force water and chemicals inside the wood. To provide a wood toning device that can be squeezed out or absorbed.

[0008]

[Function] By adjusting the color of the wood with a reducing agent, the reddish black color of the core material of the wood is intensively decolorized, and the core material and the sap material have the same level of color while the original color of the wood remains. The color tone is adjusted, and the color is adjusted with a color adjusting liquid in which an oxidizing agent and a dye having a predetermined color tone are mixed in a predetermined ratio. Then, the reducing agent in the wood is neutralized by the oxidizing agent and does not change with time due to residual chemicals.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 are a schematic front sectional view and a schematic side sectional view showing an example of an apparatus for carrying out the present invention, wherein (1) is wood, (2) is a high temperature and high pressure container, and (3a) is A decolorizing liquid tank, (3b) a toning liquid tank, and (4) a pressing device, respectively.

The wood (1) includes a core material portion generally called "akata", and the wood (1) is processed as described later to obtain a desired color.

The high-temperature and high-pressure container (2) is made of high-strength steel or stainless steel so as to withstand high-temperature and high-pressure, and a lid (2a) is hermetically attached to its opening so as to be openable and closable. An exhaust pipe (5) and an air supply pipe (6) are connected to the high-temperature high-pressure container (2), and the air is exhausted through the exhaust pipe (5) to reduce the pressure inside and to supply the air to the air supply pipe (6). The inside is pressurized by supplying pressurized air of high pressure through (1). Further, a water supply pipe (7) and a drainage pipe (8) are connected to the high-temperature high-pressure container (2) so that rinsing water is supplied to the inside through the water supply pipe (7) and the drainage pipe (8) is also supplied. ), The chemical solution and rinsing water inside are discharged. Further, a heating circulation device (11) provided with a circulation pump (9), a heat exchanger (10) and the like is connected to the high temperature high pressure container (2), and this heating circulation device (11)
The internal chemicals can be heated and circulated.

The decolorizing liquid tank (3a) stores the decolorizing liquid (a) prepared by mixing a reducing agent such as hydrosulfite in a predetermined ratio, and the toning liquid tank (3b) contains an oxidizing agent such as A toning liquid (b) prepared by mixing hydrogen peroxide and a dye in a predetermined ratio is stored, and a predetermined amount of decoloring liquid (a) and toning liquid are supplied by a supply pump (13) in a high temperature and high pressure container (2). The liquid (b) is supplied through the chemical liquid supply pipe (14).

The pressing device (4) comprises a high temperature and high pressure container (2).
The pressurizing member (15) and the pedestal (16) are vertically opposed to each other, and the press cylinder (17) is attached and fixed to the outside of the upper part of the high temperature and high pressure container (2) by an appropriate means. A pressurizing member (15) is attached and fixed by an appropriate means to the tip of a piston rod (17a) that hermetically enters the inside of the high-temperature high-pressure container (2) of the press cylinder (17). By extending the piston rod (17a) of 17) and pushing down the pressure member (15), the pedestal (16)
The wood (1) placed and supported thereon is pressed by the pressurizing force of the press cylinder (17) via the pressure member (15).

Next, the method of toning wood according to the present invention will be described.

First, the lid (2a) at the opening of the high-temperature and high-pressure container (2) is opened to open the high-temperature and high-pressure container (2), and the wood (1) to be toned is placed inside the high-temperature and high-pressure container (2). It is carried in and placed and supported on the pedestal (16) of the press machine (4) in a positioned state. Next, after closing the lid (2a) at the opening of the high temperature and high pressure container (2) to seal the high temperature and high pressure container (2), the air in the high temperature and high pressure container (2) is exhausted through the exhaust pipe (5). The high temperature and high pressure container (2) is evacuated to remove the air inside the wood (1).

When the air inside the wood (1) is extracted, a predetermined amount of decolorizing liquid is supplied from the decolorizing liquid tank (3a) into the high temperature and high pressure container (2) by the supply pump (13) through the chemical liquid supply pipe (14). (A) is supplied, and as shown in FIG. 3, wood (1)
Is immersed in the decolorizing solution (a). Then, in this state, the circulation pump (9) of the heating circulation device (11) is operated to circulate the decolorizing liquid (a) inside the high-temperature high-pressure container (2) while heating it with the heat exchanger (10). The wood (1) and the decolorizing liquid (a) are heated at a predetermined temperature for a predetermined time. Then, the wood (1) is decolorized by reacting with the decolorizing liquid (a). In particular, the reddish black core material portion called “Akata” is concentrated and decolorized by the reducing agent of the decolorizing liquid (a), and the color tone of the core material portion and the sapwood portion of the wood (1) is about the same. . Then, by observing the degree of decolorization of the wood (1) with a sensor (for example, judging the sampled decolorization liquid (a) with a colorimeter), the wood (1) is toned to a desired color. For example, hydrosulfite 1.25-2.
Using the decolorizing solution (a) prepared at a ratio of 50%,
It was confirmed that when the wood (1) was immersed for 30 minutes while being heated to ℃, the core material and the sapwood had the same color tone while the original color of the wood (1) was retained. .

When the decolorization of the wood (1) is completed, the decolorization liquid (a) in the high temperature and high pressure container (2) is drained through the drainage pipe (8), and then the press cylinder (1) of the press device (4) is discharged.
The piston rod (17a) of 7) is extended and the pressure member (1
5) The wood (1) placed on and supported by the pedestal (16) by pushing down the press cylinder (17) as shown in FIG.
The pressure is applied through the pressure member (15). At this time, since the wood (1) is heated in the decoloring process and sufficiently softened, the wood (1) can be easily compressed to a predetermined cross-sectional area ratio. Thus, when the wood (1) is pressed and compressed by the press device (4), the decolorizing liquid (a) that has penetrated into the wood (1) is extruded and the moisture content becomes uniform, and at the same time, The pits inside the wood (1) are destroyed so that the water flow is not obstructed.

When the wood (a) is compressed by the press device (4) and the decolorizing liquid (a) inside is pushed out, the high temperature and high pressure container (1)
A predetermined amount of the toning liquid (b) is supplied from the toning liquid tank (3b) through the chemical liquid supply pipe (14) by the supply pump (13),
The wood (1) is immersed in the toning solution (b). Then, in this state, when the piston rod (17a) of the press cylinder (17) of the press device (4) is withdrawn and the pressing member (15) is lifted, as shown in FIG. It is decompressed and expanded, and the expanding force forcibly absorbs the toning liquid (b) inside. After that, the circulation pump (9) of the heating circulation device (11) is operated to circulate the toning liquid (b) in the high temperature and high pressure container (2) while heating it with the heat exchanger (10), and at the same time, high temperature and high pressure. A high temperature and high pressure container (2) is provided by supplying high temperature and high pressure compressed air through a pressurized air supply pipe (5) into the container (2).
When the toning liquid (b) inside is heated, the interior of the wood (1) is efficiently impregnated with the heated toning liquid (b). Then, in this state, when the wood (1) is immersed in the toning solution (b) for a predetermined time, the wood (1) reacts with the dye of the toning solution (b) to be toned to a desired color. At the same time, the reducing agent of the decolorizing liquid (a) remaining inside the wood (1) is neutralized by the oxidizing agent of the toning liquid (b).

When the wood (1) is toned to a desired color, the toning liquid (b) in the high temperature and high pressure container (2) is discharged through the drain pipe (8), and then the high temperature and high pressure container (2) is discharged. Inside the water pipe (7)
The rinsing water is supplied through and the toned wood (1) is immersed in the rinsing water. Then, the rinsing water in the high temperature and high pressure container (2) is heated and circulated by the heating circulation device (11) to heat and soften the wood (1), and then the wood (1) is compressed and released by the press machine (4). By repeating several times, the toning liquid (b) remaining inside the wood (1) is replaced with rinsing water and removed.

By removing the toning liquid remaining inside the wood (1) in this way, the rinsing water in the high temperature and high pressure container (2) is drained while the wood (1) is compressed by the press device (4). After discharging through the liquid pipe (8) and opening the wood (1),
The wood (1) is uniformly dehydrated. Then, after this, the lid (2a) of the high temperature and high pressure container (2) is opened to open the high temperature and high pressure container (2), and the wood (1) is taken out from the high temperature and high pressure container (2) to complete the color matching.

As described above, when the wood (1) is decolorized with the decolorizing liquid (a) containing a reducing agent such as hydrosulfite, the reducing agent removes the reddish black core material portion called "Akata". Wood (1) by intensive decolorization
It is possible to decolorize the core material portion and the sap material portion in the same color tone while leaving the original color of. Further, for example, a toning solution (b) prepared by mixing an oxidizing agent such as hydrogen peroxide and a predetermined dye.
Decolorizing agent (a) by toning wood (1) with
The reducing agent of (2) is neutralized by the oxidizing agent of the toning solution (b), and it is possible to prevent a change with time due to residual chemicals.

[0023]

As described above, according to the method of the present invention, the wood containing the core material portion called "Akata" is decolorized with the decolorizing liquid containing the reducing agent, so that the original color of the wood is retained. In this state, only the red and black color of the core material is intensively decolorized to a color tone similar to that of the sap material, and this is toned to a desired color tone with a toning solution containing an oxidizing agent. Color matching is easy, and the reducing agent of the decolorizing agent is neutralized by the oxidizing agent of the toning solution so that it does not change with time due to residual chemicals.

Further, according to the apparatus of the present invention, toning of wood can be performed in a single step in a high temperature and high pressure container, so that workability can be improved and running cost can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a schematic front vertical sectional view showing an example of an apparatus for carrying out the method of the present invention.

FIG. 2 is a schematic side elevational view of FIG.

FIG. 3 is a schematic side vertical cross-sectional view showing a state in which wood is immersed in a decolorizing liquid.

FIG. 4 is a schematic side vertical cross-sectional view showing a state where wood is pressurized in a decolorizing liquid.

FIG. 5 is a schematic side vertical cross-sectional view showing a state in which wood is depressurized in a toning solution.

[Explanation of symbols]

 1 Wood 2 High-temperature and high-pressure container 3a Decoloring liquid tank 3b Color-adjusting liquid tank 4 Press device 5 Exhaust pipe 6 Pressurized air supply pipe 7 Water supply pipe 8 Drainage pipe 9 Circulation pump 10 Heat exchanger 11 Heating circulation device 13 Supply pump 14 Chemical liquid Supply pipe 15 Pressurizing member 16 Cradle 17 Press cylinder

Claims (2)

[Claims] 1. A wood is heat-treated at a predetermined temperature for a predetermined time while circulating a decolorizing liquid prepared by mixing a reducing agent in a predetermined ratio in a high temperature and high pressure container having a pressing device, and the wood is treated by the press machine. After pushing out the decoloring liquid inside, the wood is decompressed and the restoring force is used to absorb the toning liquid prepared by mixing the oxidizing agent and the dye in a predetermined ratio, and further in that state. A method of toning wood, wherein the toning solution is heat-circulated and heat-treated at a predetermined temperature for a predetermined time to adjust the color. 2. Wood is contained inside, and various treatment liquids such as a decoloring liquid prepared by mixing a reducing agent in a predetermined ratio and a toning liquid prepared by mixing an oxidizing agent and a dye in a predetermined ratio are supplied to the interior. A high-temperature high-pressure container, a heating circulation device that heats and circulates various treatment liquids in the high-temperature high-pressure container, and a press device that pressurizes and depressurizes the wood in the high-temperature high-pressure container, and is supplied to the high-temperature high-pressure container. The various treatment liquids were heated and circulated by the heating circulation device to heat and soften the wood, and the heat-softened wood was pressed and depressurized by the press device,
A wood toning device characterized by forcibly squeezing and absorbing water and chemicals inside the wood.