JP2000102907A - Manufacture of inorganic charging timber and mineral charging timber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently charge inorganic fine particles to the vicinity of a core of a timber to be treated without using a drum by opening wall holes of cells of the timber, then charging dispersion of the particles in the timber and drying it. SOLUTION: After a timber to be treated is previously barked, the timber is lumbered without finishing allowance as a green timber remains as it is. The lumbers are stuck in a pretreating unit 1, an inner kiln 2 is sealed, initially cooked with a saturated steam of a predetermined temperature and a pressure to soften timber cells, and moistures in the cells are evaporated and vaporized. Then, a combustion gas amount to an outer kiln 3 is regulated while exhausting the steam in the kiln 2 to set a predetermined superheated steam atmosphere in the kiln 2 to rush wall holes of the timber cells to be opened. After the treatment, the timer is dried by a dryer to several % of a content moisture, and transferred to a mineral charging kiln. The charging kiln is evacuated to a predetermined vacuum degree to remove containing air. Then, dispersion in which fine particles of silica or the like are separately readily mixed in a colloidal state is fed, pressurized, charged and dried. Thus, inorganic film particles can be charged to a core of the timer without using a drug.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing inorganic-filled wood and an inorganic-filled wood, and more particularly, to a technique for modifying wood by filling inorganic fine particles in a wood tissue.

[0002]

2. Description of the Related Art In recent years, attempts have been made to impregnate wood with inorganic materials to impart flame retardancy, dimensional stability, decay resistance and the like to the wood. As a method of impregnating minerals, (1) wood
Two impregnating liquids (for example, a barium chloride liquid and an ammonium hydrogen phosphate liquid) are sequentially impregnated, and an inorganic substance (barium hydrogen phosphate) is generated (deposited) by a reaction in the wood tissue.
(Japanese Unexamined Patent Publication No. 2-60735, "Wood Industry" vol. 49, No. 8, 1994, p. 367 to p. 369) or (2) Phosphoric acid compound-based flame retardant solution (for example, diammonium phosphate)
For impregnating wood with silica and a silica solution (Japanese Patent Laid-Open No.
No. 314) is known.

[0003]

However, in the above-mentioned method (1) (also referred to as a two-liquid diffusion method), it takes a long time to penetrate the chemical into the wood, and the thick wood has a core portion. Difficult to handle up to. In addition, a large amount of chemicals is required to soak wood in the chemicals, which increases the cost of treating waste liquid. Further, there is a possibility that the chemicals may remain in the wood, which is not preferable, and a treatment without chemicals (chemical-free treatment) is required. In the latter impregnation method (2),
Especially when the wood is softwood, the wall hole is almost closed, and the silica stays near the surface of the wood.

The present invention has been made in view of the above-mentioned problems, and does not use a chemical in the process of filling the wood cells with the inorganic fine particles and sufficiently removes the inorganic material to the vicinity of the core of the wood to be treated. It is an object of the present invention to provide a production method and an inorganic-filled wood in which fine particles are filled.

[0005]

For this purpose, the following method for producing an inorganic-filled wood and an inorganic-filled wood were created. That is, the method for producing an inorganic-filled wood according to the first invention, as schematically shown in FIG. 1, performs a pretreatment (step S1) for opening a wall hole of a wood cell of a wood to be treated, and then performs the pretreatment. The process is characterized in that a process of injecting a dispersion of inorganic fine particles into the wood to be treated (step S2) and thereafter drying the wood to be treated (step S3).

[0006] In this manufacturing method, the wood to be treated is pretreated so that the wall holes (also referred to as wall holes) of the wood cells are opened, and adjacent temporary pipes are brought into communication. Therefore, when the dispersion liquid of the inorganic fine particles is injected, the inorganic fine particles are sufficiently filled up to the vicinity of the core of the wood. That is,
Since the permeability of the wood to be treated is improved by the pretreatment, the inorganic fine particles (colloidal suspension water) can be relatively easily injected using water as a medium.

According to a second aspect of the present invention, in the method for producing an inorganic-filled wood, the pretreatment is a heat treatment of the wood to be treated in a superheated steam atmosphere. In the above-described manufacturing method, when the wood to be treated is heat-treated in a superheated steam atmosphere, the wood cells are softened and the moisture in the wood cells evaporates, and the difference in steam partial pressure generated inside and outside the wood cells causes the wall holes ( The wall hole ruptures and opens. At this time, the temperature in the vicinity decreases locally as the water in the wood cells is deprived, but the temperature rises immediately after the heat energy is supplied from the superheated steam, so the wall hole section subsequently bursts The difference in the partial pressure of steam becomes apparent inside and outside the cell wall adjacent to the burned wood cells. In this manner, the rupture of the wall hole portion spreads one after another to the core of the wood, and the moisture inside moves to the outside.

When the wood to be treated is cedar, the opening shape when the wall hole ruptures usually has a major axis of 5 to 10 μm.
m, a shape close to an ellipse with a minor axis of about 2 to 5 μm. Therefore, the particle diameter of the inorganic fine particles is preferably set to 2 to 5 μm or less. However, the wood to be treated is not limited to cedar, but any suitable tree species can be used, and the particle size is set to an appropriate size according to the tree species.

In the above pretreatment, the pressure and temperature may be gradually reduced while maintaining the interior of the pressure vessel containing the wood to be treated in a superheated steam atmosphere. That is, the stress given to the wood to be treated is minimized to prevent cracks and the like. In the post-treatment, the surface of the inorganic-filled wood obtained as described above can be smoothed by compression molding and the surface hardness can be increased.

[0010] In a third aspect of the present invention, there is provided an inorganic filler, wherein a wall hole of a wood cell of the wood body is open, and inorganic fine particles are filled from a surface layer to a core of the wood body. Wood. Therefore, if inorganic fine particles such as silica, white sand or ceramic are filled, wood can be imparted with desired flame retardancy, dimensional stability, decay resistance and the like at relatively low cost.

A fourth invention is an inorganic-filled wood filled with inorganic fine particles having titanium dioxide. This inorganic-filled wood is filled with inorganic fine particles to impart flame retardancy, dimensional stability, and decay resistance.In addition, since titanium dioxide acts as a photocatalyst, it prevents stains, deodorizes, sterilizes, Preferred properties such as removal of NOx in air (denitration) are added.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 2 is a schematic diagram illustrating a schematic configuration of the pretreatment device. As shown in FIG. 2, the pretreatment device 1
It has a double structure of an inner can 2 and an outer can 3 which are pressure vessels, and the door 2a of the inner can 2 is opened to open a wood to be treated (also referred to as a wood body) W
The inner can 2 is connected to a steam pipe 2b, and steam is supplied from an appropriate steam boiler such as a wood chip burning boiler or a kerosene burning boiler. The inner can 2 is provided with an exhaust pipe 2c having a leak valve, and can discharge steam to the atmosphere to adjust the internal pressure appropriately. Outer can 3
Is for forming a heating chamber that covers the inner can 2, and heats the inner can 2 by flowing a combustion gas or the like of a steam boiler from the gas pipe 3a. Reference numeral 3b in the figure denotes an exhaust port connected to a chimney via an adjusting means (not shown) such as a damper.

Next, a method for producing the inorganic-filled wood will be described. FIG. 3 is a block diagram of the manufacturing process, and FIG. 4 is a diagram illustrating transition of the inner can pressure and the inner can temperature. (1) Pretreatment step Wood to be treated in advance (in this example, a 13 mm thick cedar board)
After the peeling, the raw material is sawn to the dimensions leaving the finishing allowance. The sawn product is carried into the pretreatment device 1 and stacked, and the inner can 2 is closed by closing the door 2a. As shown in FIGS. 2 and 3, the inner can 2 has a steam temperature of about 160 ° from a steam boiler.
C or less, the initial steaming (see FIG. 4) is performed by supplying a moderately saturated steam having a steam pressure of 50 to 500 kPa. The heat treatment time for the initial steaming varies depending on the species of tree and the thickness of the plate, but is generally about 15 minutes to 2 hours. This softens the wood cells and evaporates and evaporates the water inside the wood cells. Subsequently, while appropriately discharging steam from the leak valve of the inner can 2, the temperature of the inner can is adjusted by adjusting the amount of combustion gas to the outer can 3, and the inside of the inner can 2 is set to a predetermined superheated steam atmosphere. . This step is a superheated steam heat treatment (see FIG. 4), during which the wall holes (wall hole walls) are sequentially ruptured and opened due to a difference in steam partial pressure generated inside and outside the wood cells. It is preferable to maintain an appropriate degree of superheating while gradually lowering the inner can pressure and the inner can temperature so as not to significantly deteriorate the quality of the wood to be treated. The temperature of the superheated steam is about 160 ° C or less, and the pressure is 50
To about 500 kPa.

(2) Injection Step Next, the wood to be treated after the above-mentioned superheated steam heat treatment is put into a wood drying apparatus (not shown), dried to a water content of several percent, and then transferred to an inorganic injection can. In this inorganic injection can, a vacuum pump is evacuated to a predetermined degree of vacuum to suck out the contained air, and a dispersion (suspension water) in which fine particles of ceramic or silica are prepared in a colloidal form having an appropriate concentration by a separate inorganic dispersion preparation apparatus. ) Is pumped and injected into the wood to be treated. Further, if necessary, inorganic fine particles are filled up to the core of the wood to be treated by applying pressure. The particle size of the fine particles is 2
５5 μm or less. Using white sand is cheaper than ceramic fine particles. In addition, alcohol can be used for the dispersion liquid in addition to water, but water is preferable in consideration of easy treatment of the waste liquid.

(3) Drying process After that, the wood is dried in a steam drying room or a natural wind-drying system, and the cedar board is made of a flame-retardant material having a flame retardancy, dimensional stability, decay resistance, etc. Quality wood).

In the above-mentioned pretreatment, if an inert gas such as carbon dioxide is introduced into the inner can 2, the heat treatment can be performed in an oxygen-free atmosphere. Further, after the inorganic substance is injected, before the drying step, a pressure step may be provided for compressing and molding the wood to be treated to smooth the surface and increase the surface hardness. If titanium dioxide is mixed with inorganic fine particles such as ceramics and white sand, the effect as a photocatalyst is added.

[0017]

As described above, according to the present invention,
Since the wall holes of the wood cells are opened in the wood to be treated by the pretreatment, it is possible to fill the wood tissue with a considerable amount of inorganic fine particles, for example, white sand using water as a medium, without using a chemical. The obtained wood is filled with inorganic fine particles up to the core, and is provided with flame retardancy, dimensional stability, decay resistance and the like. In addition, in the case where the inorganic fine particles contain titanium dioxide, prevention of contamination, deodorization, sterilization, Nox in air
It is possible to obtain the function and effect such as the removal of the water. Therefore, it can be used as a flame-retardant wood or an antiseptic / insect-proof material for inner and outer wall materials, structural materials, furniture, etc., and has an effect of expanding the range of use of wood.

[Brief description of the drawings]

FIG. 1 is a view schematically showing a production method of the present invention.

FIG. 2 is a schematic diagram illustrating a schematic configuration of a pretreatment device.

FIG. 3 is a block diagram illustrating a process of manufacturing the inorganic-filled wood according to the embodiment of the present invention.

FIG. 4 is a diagram for explaining changes in inner can pressure and inner can temperature.

[Explanation of symbols]

 S1 Pretreatment step S2 Injection step S3 Drying step

 ──────────────────────────────────────────────────続 き Continuing from the front page (71) Applicant 591022874 8-10 Takanedai, Fukuzumi, Fukuzumi, Chiba-gun, Aichi-cho, Chita-gun, Aichi Pref. No. Takahashi Kikkan Co., Ltd. (72) Inventor Wako Toya 2-1-15-1 Higashisakura, Higashi-ku, Nagoya City, Aichi Prefecture Inside Office S-One Co., Ltd. 9 (72) Inventor Kinju Yamada 8F, Takanedai, Fukuzumi, Agui-cho, Chita-gun, Aichi Pref. 2F 230 AA01 AA07 AA10 AA15 AA21 BA01 CA15 CA22 EB01 EB06 EB12 EB13 EB23 EB29 EB38 EC04

Claims (4)

[Claims] An inorganic-filled wood that is subjected to a pretreatment for opening a wall hole of a wood cell of a wood to be treated, then injecting a dispersion of inorganic fine particles into the wood to be treated, and then drying the wood to be treated. Manufacturing method. 2. The method according to claim 1, wherein the pre-treatment comprises heat-treating the wood to be treated in a superheated steam atmosphere. 3. An inorganic-filled wood in which a wall hole of a wood cell of a wood main body is open, and inorganic fine particles are filled from a surface layer to a core of the wood main body. 4. Inorganic-filled wood filled with inorganic fine particles having titanium dioxide.