JPH0484033A - Floor board for heating - Google Patents

Abstract

PURPOSE:To obtain a floor board for electric heating which is free from the danger of fire by using a board of noncombustible organic material, which has been acetylated and contains or is impregnated with a noncombustible inorganic compound, for a layer forming the upper side and/or the underside placed in contact with a planar heater and by superposing one on another in an integral form. CONSTITUTION:Framing members 6 with a given thickness are provided along the four marginal edges on the upper side of a wood base board 1 and fixed and a planar heater 8 sheathed with a heat-leveling plate 7 is fitted inside the thus formed framing. A thermostat 4 and leads 5 are connected to the planar heater 8. The planar heater 8 sheathed with the heat- leveling plate 7 has the same thickness as or a little smaller thickness than the frame members 6. The wood base board 1 and the wood base material 10 in a decorated wood board 9 consist of an organic material, in board form which has been treated by acetylation displacing the existing hydroxyl by acetyl and which contains or is impregnated with a noncombustible inorganic compound. The framing members 6 can also be formed of an organic board material which has been acetylated and contains or is impregnated with a noncombustible inorganic compound. Since the wood board material placed in contact with the planar heater is acetylated and rendered nonflammable by pretreatment, an improvement in the ability to prevent fire can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a heated floor board, and more particularly to an electric heated floor board that incorporates a planar heating element therein as a heat source.

<Prior art> A planar heating element is placed on the surface of a substrate made of wood board such as plywood or dense fiber board! ! Heated floorboards are known in the art, in which a heating plate (5) is installed and additionally (5) decorative wood boards are laminated and integrated.

The planar heating element is connected to the outside through lead wires embedded inside the heating floorboard to generate heat, and the heating effect is made uniform by the heat equalizing plate. A thermostat is embedded in the heated floorboard, and its operation is controlled by an external temperature controller to adjust the temperature.

<Problems to be Solved by the Invention> The electric heated floorboards as described above are known to be capable of providing safe and comfortable heating.

However, since these heated floorboards use wood materials as the substrate and surface decorative board, electrical leakage may occur due to malfunctions in the temperature control mechanism or wiring-related troubles, or deterioration of the wood boards over long-term use. There is a risk of a fire due to ignition caused by wood.In addition, heating and slow cooling are repeated in heated floorboards, so expansion and contraction due to moisture absorption and release of the wood boards becomes a problem. However, there are drawbacks such as warping and twisting, resulting in misalignment of the floorboards.

<Means for Solving the Problems> An object of the present invention is to solve the above-mentioned problems and to provide an electric heated floorboard that does not pose a risk of fire.

That is, the present invention provides a heating floor board having a planar heating element provided therein, at least the surface in contact with the planar heating element, and
This heating floor board is characterized by being integrally laminated with non-combustible organic boards which have been subjected to acetylation treatment and/or whose back surfaces are impregnated with or impregnated with a non-combustible inorganic compound.

As the nonflammable organic board containing or impregnated with a nonflammable inorganic compound, for example, those shown below (D to (In)) are used.

(I) A plurality of wooden veneers each having a nonflammable inorganic compound filled or fixed in the cell pores and/or the inner wall surface, with the fiber directions perpendicular or all in the same direction. , a laminate obtained by laminating and bonding using an adhesive.

This laminate is obtained by the following steps. First, a cutting device such as a rotary lace, a half rotary lace, a slicer, etc. is used to cut logs or fringe of coniferous materials such as pine, cedar, toga, and cypress, or hardwoods such as lauan, caboose, cruin, chestnut, poplar, and willow. Cut the wooden veneer using a wood veneer.

On the surface of this wood veneer, cell pores consisting of wood cells, conduit pores, and plate grooves are formed, or numerous cracks are exposed.

The obtained wood veneer is dried using a drying device and then subjected to acetylation treatment to replace the hydroxyl groups present in the fibers of the wood veneer with acetyl groups. This acetylation treatment involves impregnating the wood veneer with an aqueous solution of metal acetate, such as sodium acetate or potassium acetate, in the absence of a catalyst or as a catalyst, and then drying the wood veneer. ! 2. The reaction is carried out by immersing the product in an anhydride reaction solution tank and heating the reaction mixture at 00 to 150° C. for several minutes to several hours. After completion of the reaction, remove excess reaction solution and wash, preferably 7 to 1
Dry to adjust the moisture content to about 5%.

In this way, the voids such as the cell pores and conduit holes of the acetylated wood veneer are filled with a nonflammable inorganic compound, or the nonflammable inorganic compound is fixed in a layer along the inner wall of the cell pore. Alternatively, the nonflammable inorganic compound is fixed or adhered to the front and back surfaces of the wood veneer, thereby making it nonflammable. This nonflammability treatment can be performed, for example, by the following steps. That is, the wood veneer is sufficiently immersed in an aqueous solution of a water-soluble inorganic salt (hereinafter referred to as "first solution") to impregnate it. At this time, it is effective to forcibly accelerate the impregnation treatment by applying reduced pressure or increased pressure. Alternatively, the wood veneer may be brought into a high moisture content state without drying, or after drying, it may be immersed in water or hot water to absorb water to saturate it, and then immersed in the first liquid for diffusion impregnation. You can let me. As the first liquid, MgCQ2. MgB r2. MgS O
4・H20゜Mg(N Oz)z・6H:O, AQC
Qs, AQBrs.

AQ2(SO4)3. AQ(NOx)s・9H
2o, CaC(2,.

CaBr:,Ca(No,),,ZnCC2,BaBr
Examples include aqueous solutions such as 2°BaCQ, 2H:O, and Ba(NOz). By immersing the wood veneer in tea solution, ions of the solute inorganic salt diffuse into the cell pores of the wood veneer.

Next, a dewatering process is performed to remove the excess first liquid. The liquid removal process is carried out by means such as centrifugal dehydration, rinsing with water, etc. to remove excess liquid. By removing the @l solution, it is possible to suppress the excessive production of nonflammable inorganic compounds on the surface or outer periphery of the wood veneer, and to improve the diffusion and impregnation of the aqueous solution to be impregnated next.

It also prevents nonflammable inorganic compounds from being generated in a free state that is not attached or fixed to the wood veneer.

Next, a compound liquid that reacts with the first liquid to produce a water-insoluble, nonflammable inorganic compound (hereinafter referred to as the "second liquid") is added to and mixed with the wood veneer using a blender, spray, etc. The wood veneer is impregnated with 1 g of the two liquids by immersion. As in the case of the first liquid, impregnation of the second liquid into the wood veneer can be promoted by reducing or pressurizing the wood veneer. The second liquid includes Na, C○, H,
So.

(NH=):COi, Na: SO4, (NH4
): SO4+H:P○4+ Na:HPO,, (N
H4)! HPO,.

H, B○s, N a B O= , N H, B
O: etc. are exemplified.

Second liquid f: By coating or dipping, the second liquid is diffused and impregnated into the cell pores of the wood veneer, and the first liquid and the second liquid react in the wood veneer to form a nonflammable inorganic compound. generated.

The nonflammable inorganic compounds produced are magnenium phosphate and magnenium phosphate.

Barium phosphate, aluminum phosphate, magnesium borate, magnesium carbonate, calcium carbonate.

Examples include carunium compounds such as zinc phosphate, barium carbonate, calcium nitrate, and barium nitrate, magnesium compounds, aluminum compounds, barium compounds, lead compounds, zinc compounds, and silicate compounds. For example, if barium chloride is used as the first liquid and ammonium hydrogen phosphate is used as the second liquid, the barium cations and phosphoric acid anions will react, producing barium phosphate and barium hydrogen phosphate. be done.

After the reaction is complete, remove the excess liquid by centrifugal dehydration, showering, soaking, etc. Remove the 2nd liquid. The 1g 2-liquid immersion process and liquid removal process may be repeated multiple times as necessary. After the liquid removal treatment, it is dried to a script ratio of 25% or less, preferably 7 to 15%. Since this nonflammable inorganic compound is water-insoluble, after drying, it fills in, adheres to, or adheres to the cell pores of the wood veneer or the inner wall surface of the cell pores, and also adheres or adheres to the front and back surfaces of the wood veneer. Ru. As a result, the nonflammable inorganic compound is present in a form that blocks or fills the pores and cracks that appear on the surface of the wood veneer.

It is preferable that the nonflammable inorganic compound be mixed in at a ratio of 33% by weight or more to the wood veneer, and if it is less than this, sufficient fire protection performance will not be achieved. Further, in order to increase the reaction efficiency between the first liquid and the second liquid, it is preferable that the addition and mixing of the second liquid is carried out under a heated atmosphere, particularly at a temperature of 40°C or higher, more preferably 50°C or higher. Alternatively, the first and second liquids may be heated and the wood veneer is immersed in them, or electrical or mechanical vibrations may be applied using ultrasonic waves, vibrators, etc. when immersing the first and second liquids. , the treatment solution diffuses and reacts well into the wood veneer. Note that the order of processing with the first liquid and the second liquid does not matter, and it goes without saying that the processing with the second liquid may be performed first. Nonflammable inorganic compounds that adhere to or adhere to the front and back surfaces of the wood veneer are removed by brushing, vacuuming, etc., as necessary.

In this way, the hydroxyl groups present in the fibers are acetylated to replace them with acetyl groups, and the fibers are treated with acetylation in order to replace them with acetyl groups.
Alternatively, a wood veneer whose inner wall surface is filled or fixed with a noncombustible inorganic compound to make it noncombustible can be obtained.

Next, an adhesive substance is applied to at least one side of the wood veneer using a coating device such as a sprayer, a spreader, or a flow coater. As the adhesive substance, synthetic resin adhesives such as urea resin, melamine resin, inner fluorine resin, urethane resin, epoxy resin, vinyl acetate resin, phenol resin, or modified resins thereof are preferably used. It is preferable to mix and use a nonflammable inorganic compound of the same type or different type as that produced by the reaction of the first liquid and the second liquid into this adhesive substance in order to further improve the fireproof performance.

After laminating multiple wood veneers coated with an adhesive substance,
Press and bond using a pressing device such as a hot press, cold press, or turnbuckle. At this time, the fibers of the veneers can all be in the same direction, or the fibers can be laminated so that the fiber directions are perpendicular to each other. In this way, the above-mentioned laminate is obtained by integrally laminating and molding the wood veneers that have been subjected to the acetylation treatment and the non-combustibility treatment.

(II) A nonflammable inorganic compound is filled or fixed in the cell pores and/or on the inner wall surface; a wood chip board formed by integrally molding wood chips with an adhesive.

This wood chip board can be obtained, for example, by the following process. First, the raw wood, core, and waste materials of softwood materials such as pine, cedar, toga, and cypress, or hardwood materials such as lauan, capor, avitone, cruin, chestnut, poplar, and willow are cut using a cutting device such as a chinbar or flaker. It can be obtained in the form of chips, flakes, strands, etc. by cutting with a . This wood chip has cell pores consisting of cells of the work material, conduit pores, or teaching canal pores, and the cell wall at the outer periphery of the wood chip is torn and has numerous cracks.

The obtained wood chips are dried in a drying device and then subjected to acetylation treatment to replace the hydroxyl groups present in the fibers of the wood chips with acetyl groups. This acetylation treatment involves impregnating the wood chips with an aqueous solution of metal acetate, such as sodium acetate or potassium acetate, without a catalyst or as a catalyst, drying the chips, and then impregnating them with an acetic anhydride such as acetic anhydride or chloroacetic anhydride. The reaction is carried out by immersing it in a reaction liquid tank and heating it at 100 to 150°C for several minutes to several hours. After the reaction is completed, excess reaction solution is removed, washed, and dried to preferably adjust the water content to about 7 to 15%.

Cell pores of wood chips acetylated in this way,
A nonflammable inorganic compound is filled in a void such as a conduit hole, or the nonflammable inorganic compound is fixed or adhered in a layer along the inner wall of the cell pore, and the nonflammable inorganic compound is also applied to the outer periphery of the wood chips. Nonflammability treatment is performed by fixing or attaching. This nonflammability treatment can be performed, for example, by the following steps. That is, the wood chips are sufficiently immersed in an aqueous solution of a water-soluble inorganic salt (hereinafter referred to as "first solution") to impregnate it.

At this time, it is effective to forcibly accelerate the impregnation treatment by applying reduced pressure or increased pressure. Alternatively, the wood chips may be brought into a high moisture content state without drying, or after being dried, they may be immersed in water or warm water to absorb water and become saturated with water.
Diffusion impregnation may also be carried out by immersing it in a liquid. As the first liquid, MgCQ2. MgBr, ,MgSO4.H,O.

Mg(NOx)z”6H20,AQCQ3.AQBr,
.

Al22(SOa)s, AQCNOs)s・9Hzo,
CaCf: 22°CaBr2. Ca(NOx):, Zn
(1:, BaBr2゜BaCQ:・2 H:O, Ba(
NO3)! Examples include aqueous solutions such as By immersing the wood chips in the first liquid, ions of the inorganic salt of the solute diffuse into the cell pores in the wood chips.

Next, a dewatering process is performed to remove the excess first liquid. The deliquification treatment is carried out by means such as centrifugal deliquidation, rinsing, or soaking in water, and by removing the excess Ml solution, nonflammable inorganic compounds are excessively produced on the outside of the wood chips. This suppresses this and improves the diffusion impregnation of the aqueous solution to be impregnated next. It also prevents nonflammable inorganic compounds from being produced in a free state that is not attached or fixed to the wood chips.

Next, a compound liquid (hereinafter referred to as "second liquid") that reacts with 1g of the first liquid to produce a water-insoluble, nonflammable inorganic compound.
The second liquid is added to and mixed with the wood chips using a blender, spray, etc., or immersed in the wood chips, thereby impregnating the wood chips with the second liquid. As with the vgl solution, impregnation of the wood chips with the second solution can be promoted by vacuum or pressure treatment.

As the second liquid, Na2COx, H:SO-.

(NHs):Cox, Na:so, (NH4):S
O.

H, PO4, Na:HPO, (NH,), HPO,.

Examples include H, BO, NaBO2, NH4BO, and the like.

By applying or dipping the second liquid, the second liquid is diffused and impregnated into the cell pores of the uncut piece.
A nonflammable inorganic compound is produced by the reaction with the liquid. Nonflammable inorganic compounds produced include magnesium phosphate,
Calcium phosphate, barium phosphate, aluminum phosphate, magnesium borate, magnesium carbonate, calcium carbonate.

Examples include carunwam compounds such as zinc phosphate, barium carbonate, calcium nitrate, and barium nitrate, magnesium compounds, aluminum compounds, barium compounds, lead compounds, zinc compounds, and silicate compounds. For example, if barium chloride is used as the first liquid and ammonium hydrogen phosphate is used as the second liquid, the barium cations and phosphoric acid anions will react, producing barium phosphate and barium hydrogen phosphate. be done.

After the reaction is completed, the excess second liquid is removed by centrifugal deliquidation or by washing with water using a drying method, dobuzuke, or the like. The second liquid immersion process and the liquid removal process may be repeated multiple times as necessary. After the liquid removal treatment, it is dried to a moisture content of 25% or less, preferably 7 to 15%. Since this nonflammable inorganic compound is water-insoluble, after drying, it fills, adheres, or adheres to the inside of the cell pores of the wood chips or the inner wall surface of the cell pores, and also adheres or adheres to the outer periphery of the wood chips. Ru. As a result, the nonflammable inorganic compound is present in a form that blocks or fills the pores and cracks in the wood chips.

It is preferable that the nonflammable inorganic compound is mixed in at a ratio of 33% by weight or more to the wood chips, and if it is less than this, sufficient fireproof performance cannot be obtained. In addition, in order to increase the reaction efficiency between the first liquid and the second liquid, the addition and mixing of the second liquid is carried out under a heated atmosphere.
In particular, it is preferable to carry out at a temperature of 40°C or higher, more preferably 50°C or higher. Furthermore, if the first liquid and the second liquid are heated and the wood chips are immersed in them, or if the 8g liquid and the second liquid are immersed, electrical or mechanical vibrations are applied using ultrasonic waves, a vibrator, etc. Diffusion and reaction of the treatment liquid into the wood chips are carried out well.

(8) The order of the treatment with the first liquid and the second liquid is not limited, and it goes without saying that the treatment with the second liquid may be performed first.

In this way, the hydroxyl groups present in the fiber are acetylated to replace them with acetyl groups, and a nonflammable inorganic compound is fixed in the cell pores or on the inner surface, and the nonflammable inorganic compound is also attached to the outer periphery. Wood shavings that are fixed or adhered to make them non-combustible are obtained.

The wood shavings are then placed in a mixing device to add and adhere an adhesive substance. As the adhesive substance, synthetic resin adhesives such as urea resin, melamine resin, incyanate, urethane resin, epoxy resin, vinyl acetate resin, phenol resin, or modified resins thereof are preferably used. If the adhesive substance is mixed with a nonflammable inorganic compound of the same type or different type as that produced by the reaction between the first liquid and the second liquid, the fire protection performance can be further improved.

The wood chips to which the adhesive substance has been added and mixed are air blown and put into a 7-smoothing device to form a continuous real chip mat of a constant thickness on the conveying device.

The wood shavings can be produced by cutting the obtained wood shavings mat to a specified length, inserting it into a hot press and hot-pressing it, or by hot-pressing the mat in a continuous press and then cutting it to a specified length. A single plate is obtained.

Cm) A wood aIs board made by integrally molding wood fibers filled or fixed with a nonflammable inorganic compound into the pores and/or the inner wall surface via an adhesive.

This wood fiber board can be obtained, for example, by the following process. First, one or more types of wood chips, such as raw wood, cored wood, waste wood, etc., of softwood materials such as pine, cedar, toga, and cypress, or hardwood materials such as lauan, capor, abitton, cruin, chestnut, poplar, and willow, are used as wood chips. This is degreased and softened by steaming under high-temperature, high-pressure steam, and then defibrated using a fibrillator to obtain wood fibers.

This wood fiber has a length of 1 to 30 mm and a thickness of 2 to 30 mm in diameter.
The majority are about 0μ. These wood fibers have the shape of several to tens of cell pores made of wood cells, conduit pores, or plate pores arranged in water bundles, and the cell walls around the fiber periphery are torn or cracked. I often do this.

Bayasu, which is obtained by cutting sugar cane, corn stalks, coconut shells, etc. into chips and then fibrillating them, can also be used as the wood fiber.

The obtained wood fibers are dried using a drying device, and then subjected to acetylation treatment in order to replace the hydroxyl groups present in the wood fibers with acetyl groups. This acetylation treatment is carried out by impregnating the wood fibers with an aqueous solution of metal acetate such as sodium acetate or potassium acetate as a catalyst and drying the wood fibers without a catalyst or with an acetic anhydride such as acetic anhydride or chloroacetic anhydride. The reaction is carried out by immersing it in a reaction liquid tank and heating it at 100 to 150°C for several minutes to several hours. After the reaction is completed, excess reaction solution is removed, washed, and dried to preferably adjust the water content to about 7 to 15%.

Cell pores of wood fibers treated with acetylation in this way,
A nonflammable inorganic compound is filled into voids such as conduit holes, or the nonflammable inorganic compound is fixed or attached in a layer along the inner wall of the cell pore, and the nonflammable inorganic compound is also applied to the outer periphery of the wood fibers. Nonflammability treatment is performed by fixing or adhering. This nonflammability treatment can be performed, for example, by the following steps. That is, the wood fibers are sufficiently immersed in an aqueous solution of a water-soluble inorganic salt (hereinafter referred to as "first solution") to impregnate it.

At this time, it is effective to forcibly accelerate the impregnation treatment by applying reduced pressure or increased pressure. Alternatively, the wood fibers may be brought into a high moisture content state without being dried, or after being dried, they may be immersed in water or hot water to absorb water to saturate the wood fibers, and then immersed in the first liquid for diffusion impregnation. It's okay. As the first liquid, MgCQ2. MgBr=, Mg5o, -H, ○.

Mg(NO3)2'5Hzo, Agcc,, A4Br
5゜Affx(SO4)3. AQ(NOx)x-
9H20, CaCQx.

CaBr2. Ca(NO3)2. ZnCQ, , BaBr
Examples include aqueous solutions such as 2°BaCL.2HzO and Ba(NOJz). By impregnating the wood fibers by immersing them in the first solution, ions of the inorganic salt of the solute diffuse into the cell pores of the wood fibers.

Next, a dewatering process is performed to remove the excess first liquid. The liquid removal treatment is carried out by means such as centrifugal dehydration or Java or dobuzuke washing, and by removing the excess first liquid, it is possible to avoid excessive production of nonflammable inorganic compounds on the surface of the wood fibers. suppresses and improves diffusion impregnation of the aqueous solution to be impregnated next. It also prevents nonflammable inorganic compounds from being produced in a free state that is not attached or fixed to wood fibers.

Next, a compound liquid that reacts with the first liquid to produce a water-insoluble, nonflammable inorganic compound (hereinafter referred to as the "second liquid") is added to and mixed with the wood fibers using a blender, spray, etc., or immersed. By letting it soak, the wood fibers are impregnated with the second liquid. As in the case of the first liquid, impregnation of the second liquid into the wood fibers can be promoted by reducing or pressurizing the wood fibers.

As the second liquid, Na:CO,, H2SO4° (NH
4) 2COx, Na2S O4, (NH&)2S
Oi H2PO4, Na2HPO4, (NH4)zHPO
4°) 13BO3, NaBOz, NH4BO2, etc. are exemplified.

By applying or dipping the second liquid, the second liquid is diffused and impregnated into the cell pores of the wood fiber, and the first liquid and the second liquid are mixed in the wood fiber.
A nonflammable inorganic compound is produced by the reaction with the liquid. Nonflammable inorganic compounds produced include magnesium phosphate,
Calcium phosphate, barium phosphate, aluminum phosphate, magnesium borate, magnesium carbonate, calcium carbonate.

Examples include calcium compounds such as zinc phosphate, barium carbonate, calcium nitrate, and barium nitrate, magnesium compounds, aluminum compounds, barium compounds, lead compounds, zinc compounds, and silicate compounds. For example, if barium chloride is used as the first liquid and ammonium hydrogen phosphate is used as the second liquid, the barium cations and phosphoric acid anions will react, producing barium phosphate and barium hydrogen phosphate. be done.

After the reaction is completed, the excess second liquid is removed by centrifugal deliquidation or by washing with water using a shower, soaking, or the like. The second liquid immersion process and the liquid removal process may be repeated multiple times as necessary. After the liquid removal treatment, it is dried to a moisture content of 25% or less, preferably 7 to 15%. Since this nonflammable inorganic compound is water-insoluble, after drying, it fills in, adheres to, or adheres to the inside of the cell pores of the wood fibers or the inner wall surface of the cell pores, and also adheres to or adheres to the outer periphery of the wood fibers. As a result, the nonflammable inorganic compound exists in a form that blocks or fills the pores and cracks appearing on the surface of the wood fibers.

It is preferable that the non-combustible inorganic compound is mixed in at a ratio of 33% by weight or more based on the wood fibers, and if it is less than this, sufficient fire protection performance cannot be obtained. In addition, in order to increase the reaction efficiency between the first liquid and the second liquid, the addition and mixing of the second liquid is carried out under a heated atmosphere.
In particular, it is preferred to carry out at a temperature of 40°C or higher, more preferably 50°C or higher. Furthermore, if the first liquid and the second liquid are heated and the wood fibers are immersed in them, or if electrical or mechanical vibrations are applied using ultrasonic waves or a vibrator when immersing the first liquid and the second liquid, The treatment solution diffuses and reacts well into the wood fibers.

Note that the order of processing with the first liquid and the second liquid does not matter, and it goes without saying that the processing with the second liquid may be performed first.

Thus the tree m! In addition to being acetylated to replace the hydroxyl group present in I with an acetyl group, a nonflammable inorganic compound is fixed within the cell pore or on the inner wall surface, and a nonflammable inorganic compound is also fixed or attached to the outer periphery. Wood fibers treated to make them incombustible are obtained.

Next, this acetylated noncombustible wood fiber is put into a mixing device, and the adhesive substance 3 is added and adhered.

In the mixing device, optional additives such as a water agent and a smoke reducing agent can be simultaneously mixed as required. Furthermore, if the adhesive substance is mixed with a nonflammable inorganic compound of the same type or different type as that produced by the reaction of the first liquid and the second liquid, the fire prevention performance can be further improved. As the adhesive substance, synthetic resin adhesives such as urea resin, melamine resin, isocyanate, urethane resin, epoxy resin, vinyl acetate resin, phenol resin, or modified resins thereof are preferably used.

The wood fibers to which the adhesive substance has been attached are conveyed by air to form a wood fiber cloak, which is then cut and formed into a hot-press molded body to obtain the above-mentioned wood fiber board.

Effect> The wooden board on the front side and/or the back side that is in contact with the planar heating element is acetylated to replace the existing hydroxyl groups with acetyl groups, and is also treated with a non-flammable inorganic compound or impregnated with a non-flammable inorganic compound. Because it is treated with moisture, it absorbs and releases moisture.
Expansion and contraction due to absorption and discharge of water is suppressed, and even the heating action of the planar heating element does not cause a fire.

<Example> FIGS. 1 and 2 show a heating floor board according to an example of the present invention. A groove 2 extending in the longitudinal direction at approximately the center of the elongated wooden substrate l and a recess 3 formed slightly wider at an appropriate position of the groove are carved into the surface of the long wooden substrate l, and an internal thermostat 4 is embedded in the recess. 3, and the lead wire 5 from the thermostat is housed in I42. The lead wire 5 is connected to a controller (not shown) attached to any room in the room, and the temperature can be controlled to a desired temperature by operating the controller.

Frame members 6 of arbitrary thickness are fixed to the four peripheral edges on the front side of the wooden substrate l, and a planar heating element 8 covered with a heat equalizing plate 7 is fitted into the frame assembly thus formed. The thermostat 4 and lead wires 5 are connected to the planar heating element 8 .

The thickness of the planar heating element 8 covered by the heat equalizing plate 7 is formed to be the same as or slightly smaller than the thickness of the frame member 6.

Further, a decorative wooden board 9 having substantially the same dimensions as the wooden substrate 1 is laminated on the frame member 6 and integrated using an arbitrary adhesive. The decorative wood board 9 has a printed pattern, coloring, and coating on the surface of the wood base 10.
Optional decorations such as decorative paper pasting, resin-impregnated decorative paper pasting, synthetic resin decorative sheet pasting, and veneer pasting are applied. In the illustrated embodiment, a decorative wood board 9 is formed by pasting veneers 11 in an irregular pattern on the surface of a wood base material IO. The opposing edges of the wooden base material 10 are provided with stamens 10a and tob, respectively, making it possible to connect a plurality of heated floorboards in the width direction. Although not shown, by performing similar actual processing on both longitudinal edges of the wooden base material 10,
Longitudinal articulation of heated floorboards may also be possible.

In the heated floorboard having the above configuration, the wood substrate 10 in the wood substrate 1 and the decorative wood board 9 is acetylated to replace the existing hydroxyl groups with acetyl groups, and
It is an organic board containing or impregnated with a nonflammable inorganic compound. The frame member 6 may also be an organic board that has been acetylated and contains or is impregnated with a nonflammable inorganic compound. The organic board subjected to the acetylation treatment and the nonflammability treatment is a laminate board, a wood chip board, or a wood fiber board obtained in the above manner.

<Effects of the Invention> According to the present invention, the wood board material in contact with the planar heating element embedded in the heated floorboard is acetylated and nonflammable treated in advance, so the dimensional properties and fire resistance are significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing the structure of a heated floorboard according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view in the width direction thereof. Explanation of symbols

Claims (4)

[Claims] (1) In a heated floorboard having a planar heating element provided therein, at least the surface and/or back surface in contact with the planar heating element is subjected to acetylation treatment and contains or is impregnated with a nonflammable inorganic compound. A heating floor board characterized by being made by integrally laminating noncombustible organic boards. (2) The above-mentioned non-combustible organic board is acetylated and a plurality of wood veneers whose cell pores and/or inner wall surfaces are filled or fixed with the above-mentioned non-combustible inorganic compound are attached via an adhesive substance. The heating floor board according to claim 1, characterized in that it is a laminated board formed by laminating and bonding. (3) The above-mentioned non-combustible organic board is acetylated and integrally molded with wood chips whose cell pores and/or inner wall surfaces are filled or fixed with the above-mentioned non-combustible inorganic compound via an adhesive substance. 2. The heating floor board according to claim 1, wherein the heated floor board is a wood chip board made of wood. (4) The above-mentioned non-combustible organic board is subjected to acetylation treatment, and wood fibers whose cell pores and/or inner wall surfaces are filled or fixed with the above-mentioned non-combustible inorganic compound are molded into one piece through an adhesive substance. The heated floor board according to claim 1, characterized in that it is a wood fiberboard made of wood.