JPH04216005A - Decorative sheet and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain a fancy veneer with excellent fireproof characteristics without spoiling wooden feeling. CONSTITUTION:A wooden veneer consisting of a spring material part and an autumn material part and having the grain of wood incombustibly treated by filling or sealing an incombustible inorg. compd. in cell holes and/or on the wall face of the cell holes of the spring material part is adhered on the surface of a wood chip sheet incombustibly treated by filling or adhering similarly the incombustible inorg. compd. in cell holes and/or on the wall face of the cell holes of wood chips through an adhesive. A surface decoration with 'UZUKURI'(natural grain glossy finish tone) is obtd. by grinding the surface of the wooden veneer and forming thereby the spring material part into a recessed part.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative board whose nonflammability can be improved without impairing its wood texture, and a method for manufacturing the same.

0002

BACKGROUND OF THE INVENTION In recent years, wood-like materials have become popular as building materials and construction members, but wood is flammable, so its use is limited. Wood cannot be used as is, especially in locations subject to interior design restrictions under the Building Standards Act. For this reason, a composite material is used in which a substrate is an inorganic board made of a noncombustible material or a noncombustible material, and a veneer, that is, a decorative wood veneer is adhered to the surface of the substrate.

0003

[Problem to be solved by the invention] In this composite material, even though it is cut into a thin plate, the wood veneer itself has not been treated to make it incombustible in any way, so it cannot be used as a composite material due to its flammability. The fire protection performance of the substrate is lowered, and the rank of fire protection performance is lowered, such that those using a non-combustible material as a substrate are classified as a non-combustible material, and those using a non-combustible material as a substrate are classified as a flame-retardant material. This problem can be solved by treating the wood veneer with fire retardant chemicals, but since fire retardant chemicals are expensive, this increases the cost, and there are problems such as strange odors and discoloration after treatment with fire retardant chemicals, so it is not practical. This was difficult to adopt as a solution to the above problem.

0004

[Means for Solving the Problems] In view of the problems of the prior art described above, the present inventor has conducted intensive research on a decorative veneer and a method for manufacturing the same that can improve fireproof performance without impairing the wood texture. As a result, the present invention has been completed.

That is, the decorative board according to the present invention is a wood veneer having a wood grain consisting of a spring wood portion and a fall wood portion, and a nonflammable inorganic compound is contained in the cell pores of the spring wood portion and/or on the inner wall surface of the cell pores. non-combustible wood chips, which are made by filling or fixing a wood veneer with a non-combustible inorganic compound filling or fixing a non-combustible inorganic compound into the cell pores of the wood chips and/or on the inner wall surface of the cell pores through an adhesive substance It is characterized in that it is attached to the surface of a noncombustible wood particle board formed integrally with an adhesive substance. The spring portion is preferably formed as a recess.

[0006] Furthermore, the method for manufacturing a decorative board according to the present invention includes (
a) Obtaining a wood veneer with a grain consisting of a spring wood part and an autumn wood part by cutting the raw wood, (b) Obtaining the spring wood by immersing the obtained wood veneer in an aqueous solution of inorganic salt. a step of impregnating only the inorganic salt aqueous solution, (c)
This wood veneer is immersed in a compound solution that reacts with the inorganic salt to produce a water-insoluble, nonflammable inorganic compound, and the above-mentioned inorganic salt is applied to the inside of the cell pores and/or on the inner wall surface of the cell pores in the spring wood portion of the wood veneer. A noncombustible wood veneer is obtained by a step of filling or fixing a noncombustible inorganic compound, and (d) a drying step, and (i) a noncombustible inorganic compound is added within the cell pores of the wood chips and/or on the inner wall surface of the cell pores. a step of filling or fixing (ii)
) mixing the obtained noncombustible wood chips with an adhesive substance to form a noncombustible wood chip mat; and (iii) pressing the noncombustible wood chip mat to form an integral piece. The present invention is characterized in that a noncombustible wood particle board is obtained, and the noncombustible wood veneer is adhered to the surface of the noncombustible wood particle board via an adhesive material and integrally formed. Before or after the nonflammability treatment with the above chemical solution, or after pasting it on the surface of the noncombustible wood chipboard,
It is preferable to grind the surface of the wood veneer and form the spring portion as a recess.

[0007] The method for producing decorative laminates according to the present invention will be described in detail below. First, the wooden veneer is made by cutting logs or flitches of trees such as cedar, pine, maple, toga, and cypress into rotary lace, half rotary lace, or slicer. It is obtained by cutting using a cutting device such as, and has a wood grain consisting of a spring wood portion and an autumn wood portion. In general, spring wood has large cells and a thin cell wall and is soft, whereas autumn wood has small cells and a thick and hard cell wall. Therefore, the spring wood part has a low density, is easily ignited by flame, and has a fast burning speed. vice versa,
Autumn wood has a high density and is difficult to ignite when exposed to flame, and its burning rate is slow. The difference in density between spring wood and autumn wood varies depending on the tree species, but in general, the density difference in autumn wood is 2 to 3.4% higher than that in spring wood.
It has twice the density. Furthermore, the wood veneer has cell pores consisting of cells and conduit grooves, and the cell pores are opened on the surface thereof.

[0008] The wood veneer cut into thin plates is dried and adjusted to have a moisture content of about 7 to 15%.

Next, the surface of the wooden veneer is polished by brushing, sandblasting, etc., and only the spring material portions are ground to form recesses.

[0010] Next, the wood veneer is immersed in an aqueous solution of an inorganic salt (hereinafter referred to as the "first solution"), and only the spring wood portion of the wood grain is impregnated with the first solution. As mentioned above, the spring wood has a low density, so the first liquid is easily penetrated, whereas the first liquid is difficult to penetrate into the dense autumn wood, so the impregnation method and time should be adjusted accordingly. By making adjustments, it is easy to impregnate substantially only the spring material with the first liquid. The impregnation time is appropriately adjusted depending on conditions such as the species of the wood veneer, the thickness of the board, and the impregnation method, but generally about 30 minutes to 6 hours is sufficient.

[0011] During impregnation with the first liquid, it is effective to forcefully accelerate the impregnation process by applying reduced pressure or increased pressure. Alternatively, the wood veneer may be brought into a high moisture content state without drying, or once dried, 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. It's okay.

[0012] As the first liquid, MgCl2, MgBr2
, MgSO4・H2O, Mg(NO3)2・6H2O,
AlCl3, AlBr3, Al2(SO4)3, Al(
NO3)3・9H2O, CaCl2, CaBr2, Ca
(NO3)2, ZnCl2, BaBr2, BaCl2・
Examples include aqueous solutions such as 2H2O and Ba(NO3)2. By immersing the wood veneer in the first solution, ions of the inorganic salt of the solute diffuse into the cell pores in the spring wood of the wood veneer.

[0013] Next, a liquid removal process is performed to remove the excess first liquid. The liquid removal treatment is carried out by means such as centrifugal dehydration, showering, and soaking in water, and by removing the excess first liquid, nonflammable inorganic compounds are excessively produced on the surface of the wood veneer. and improves the diffusion 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. After the liquid removal treatment, component crystals of the first liquid deposited on the surface are removed, if necessary.

Next, a compound liquid (hereinafter referred to as "second liquid") that reacts with the first liquid to produce a water-insoluble, nonflammable inorganic compound is added to and mixed with the wood veneer using a blender, spray, etc. The wood veneer is impregnated with the second liquid by soaking or dipping. 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. As the second liquid, Na2C
O3, H2SO4, (NH4)2CO3, Na2SO4
, (NH4)2SO4, H2PO4, Na2HPO4,
(NH4)2HPO4, H3BO3, NaBO2, NH
An example is 4BO2. By applying or dipping the second liquid into the cell pores in the spring wood part of the wood veneer.
The liquid is diffused and impregnated, the first liquid and the second liquid react in the wood veneer, and a nonflammable inorganic compound is generated. 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.

[0015] After the reaction is completed, the excess second liquid is removed by deliquification treatment by means such as centrifugal deliquidation or washing with water such as showering or soaking. The second liquid immersion process and the liquid removal process may be repeated multiple times as necessary. After the liquid removal treatment, dry to reduce the moisture content to 25% or less, preferably 7 to 7%.
It shall be 15%. Since this nonflammable inorganic compound is water-insoluble, after drying, it fills, adheres, or adheres to the inside of the cell pores or the inner wall surface of the cell pores in the spring wood portion of the wood veneer. 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. Nonflammable inorganic compounds fixed or adhered to the surface of the decorative veneer can be optionally removed by means such as brushing or vacuuming.

[0016] In order to increase the reaction efficiency of the first liquid and the second liquid, the addition and mixing of the second liquid is preferably 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.

[0017] In this way, a noncombustible wood veneer is obtained in which a noncombustible inorganic compound is filled or fixed in the cell pores and/or on the inner wall surface of the cell pores in the spring wood part of the wood veneer, and the spring wood part is formed as a recess. A board is obtained. This noncombustible wood veneer may be reinforced, if necessary, by adhering an arbitrary backing paper such as Japanese paper, nonwoven fabric, chemical fiber paper, synthetic fiber paper, or synthetic paper to the back surface thereof.

[0018] In the above method, the spring wood portion is ground prior to the chemical treatment with the first and second liquids, but after the chemical treatment with these liquids, it is ground in a state of high moisture content or dried. Later, in a state of low moisture content, the surface may be brushed or coarsely sanded to partially grind the spring wood portion with a low density to form a recess.

On the other hand, a noncombustible wood chip board can be obtained as follows. First, softwood materials such as pine, cedar, cypress, and toga,
Alternatively, wood shavings in the form of chips, flakes, strands, etc. are obtained by cutting hardwood such as lauan, capor, apitong, cruin, chestnut, poplar, willow, agathis, etc. with a cutting device such as a chipper or flaker. These wood chips have cell pores consisting of wood cells and duct grooves or tracheid grooves, and the cell walls around the outer periphery of the wood chips are often torn or cracked, so moisture and moisture can absorb a lot of.

After drying the obtained wood chips using a drying device and adjusting the moisture content to about 7 to 15%, the voids in the cell pores are filled with a nonflammable inorganic compound, or Nonflammability treatment is performed by fixing or adhering the nonflammable inorganic compound in a layered manner along the wall surface. This flameproofing treatment is basically the same as the treatment for the wood veneer described above, so the details will be omitted.

[0021] Thus, a noncombustible wood chip is obtained in which the noncombustible inorganic compound produced by the reaction between the first liquid and the second liquid is fixed or adhered to the inside of the cell pores of the wood chip and/or to the inner wall surface of the cell pores. is obtained. The non-combustible wood shavings are placed in a mixing device and an adhesive substance is added and adhered thereto. In the mixing device, arbitrary additives such as a water generating agent and a smoke reducing agent can be mixed at the same time as necessary. 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. At this time, if the adhesive 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 prevention performance of the decorative board can be further improved. This is preferable because it can be done.

[0022] The noncombustible wood chips to which the adhesive substance has been attached are placed in a hot air duct and dried while being blown with air. The air blowing speed at this time is generally about 15 to 20 m/sec, but can be adjusted over a wide range depending on the specific gravity of the wood chips, the feeding amount, the throughput of the previous and subsequent steps, etc. This hot air drying brings the moisture content of the wood chips to about 6 to 15%.

[0023] The dried noncombustible wood chips are formed into a noncombustible wood chip mat using a forming device, cut into appropriate sizes, and then molded into one piece by heat pressing to form a noncombustible wood chip board. is obtained. The noncombustible wood shavings mat may be heated and pressed in a continuous press and then cut into regular lengths.

[0024] After applying an adhesive substance to the surface of the obtained noncombustible wood chip board using a coating device, noncombustible wood veneers are laminated and pressed using a pressing device such as a hot press or a cold press. Perform tightening. The adhesive substance used in this case is
The same adhesive substance as the above-mentioned adhesive substance added to wood chips may be used, and it is also preferable to use a substance mixed with a nonflammable inorganic compound in order to further improve the fire prevention performance.

In this way, the decorative board of the present invention is obtained, in which the noncombustible wood veneer is adhered to the surface of the noncombustible wood chip board via an adhesive substance. In this decorative board, since the spring portions of the wood veneer on the surface are formed in a concave shape, a concave-looking decorative board is obtained. The surface of the obtained decorative board is optionally coated if necessary.

[0026] Above, we have already described the method of forming the spring wood part in a concave shape in the wood veneer, but after the noncombustible wood veneer is attached to the surface of the noncombustible wood chip board, brushing, sandblasting, etc. The spring portion of the noncombustible wood veneer can also be formed into a concave shape by performing a grinding process.

[0027]

[Effects of the Invention] The decorative board according to the present invention is made up of a wooden veneer adhered to the surface of a substrate made of a wood chip board, and has a concave-like surface decoration with an excellent wood texture. A noncombustible wood particle board that has been treated to make it noncombustible is used as the substrate, and the spring wood part of the wood veneer on the surface, which is easy to ignite with flame due to its low density and has a high burning rate, is treated to make it noncombustible. Therefore, a decorative board with excellent fire retardant performance can be obtained. In addition, since it is only necessary to make the spring wood part incombustible when treating the wood veneer, the process can be completed in a short time.

Claims (7)

[Claims] Claim 1: A wood veneer having a wood grain consisting of a spring wood part and a fall wood part, wherein a nonflammable inorganic compound is filled or fixed to the cell pores and/or the inner wall surface of the cell pores of the spring wood part. A noncombustible wood veneer is formed by filling or adhering a noncombustible inorganic compound to the cell pores and/or the inner wall surface of the cell pores through an adhesive substance. A decorative board characterized by being adhered to the surface of an integrated noncombustible wood particle board. 2. The decorative board according to claim 1, wherein the spring member is formed as a recess. Claim 3: (a) A step of cutting raw wood to obtain a wood veneer having grains consisting of spring wood and autumn wood; (b) immersing the obtained wood veneer in an aqueous solution of inorganic salt. (c) immersing the wood veneer in a compound solution that reacts with the inorganic salt to produce a water-insoluble, nonflammable inorganic compound; A noncombustible wood veneer is obtained by a step of filling or fixing the noncombustible inorganic compound into the cell pores and/or the inner wall surface of the cell pores in the spring wood portion of the wood veneer, and (d) drying the wood veneer, and ( i) Filling or fixing a noncombustible inorganic compound into the cell pores and/or the inner wall surface of the cell pores of the wood chips, (ii) Mixing an adhesive substance into the obtained noncombustible wood chips to produce noncombustible wood. forming a particle mat;
and (iii) obtain a noncombustible wood particle board by pressing and molding the noncombustible wood shavings mat, and attach the noncombustible wood shavings to the noncombustible wood veneer via an adhesive substance. A method for manufacturing a decorative board, characterized by adhering it to the surface of the board and integrally molding it. 4. The method for manufacturing a decorative board according to claim 3, wherein the surface of the wooden veneer obtained by cutting raw wood is ground to form the spring portion as a recess. 5. The production of a decorative board according to claim 3, wherein the surface of the noncombustible wood veneer that has been subjected to a nonflammability treatment by producing the noncombustible inorganic compound is ground to form the spring portion as a recess. Method. 6. After adhering the noncombustible wood veneer to the surface of the noncombustible wood chip board via the adhesive substance,
4. The method for manufacturing a decorative board according to claim 3, wherein the surface of the noncombustible wood veneer is ground to form the spring portion as a recess. 7. A noncombustible inorganic compound is added to and mixed with the adhesive substance used for adhering the noncombustible wood veneer to the surface of the noncombustible wood chip board.
7. The method for producing a decorative board according to any one of items 6 to 6.