JPH04216046A - Decorative panel and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain a decorative panel excellent in fire resistant properties without losing a wooden feeling. CONSTITUTION:Wooden veneer having grains consisting of spring wood parts and autumn wood parts is made incombustible by infiltrating an incombustible inorg. compound in the cells of the spring wood parts or fixing the same to the inner wall surfaces of the cells thereof to be bonded to the surface of a laminated material, which consists of respective wooden veneers made incombustible in the same way by infiltrating the incombustible inorg. compound in the cells of respective wooden veneers or fixing the same to the inner wall surfaces of the cells thereof, through an adhesive. By forming the spring wood parts into recessed parts by cutting the surface of the wooden veneer, 'UZUKURI' (natural grain glossy finish tone) decoration is obtained.

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 components, 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. A non-combustible wood veneer comprising a non-flammable inorganic compound filled or fixed to the cell pores and/or the inner wall surface of the cell pores of the wood veneer via an adhesive substance. It is characterized in that it is attached to the surface of a noncombustible laminate formed by laminating and bonding a plurality of sheets. 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 to the cell pores and/or the inner wall surface of the cell pores of the wood veneer. and (ii) a step of laminating a plurality of the obtained noncombustible wood veneers via an adhesive substance and molding them into one piece to obtain a noncombustible laminate, and the noncombustible wood veneers are It is characterized in that it is adhered to the surface of the non-combustible laminate material via an adhesive substance and integrally molded. It is preferable to grind the surface of the wood veneer and form the spring material portions as recesses before or after the nonflammability treatment with the chemical solution, or after adhering to the surface of the noncombustible laminate.

[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 laminate can be obtained as follows. That is, a wood veneer is obtained in the same manner as in the case of obtaining the noncombustible wood veneer, and after adjusting its moisture content to about 7 to 15%, the voids in the cell pores are filled with a noncombustible inorganic compound. Alternatively, nonflammability treatment is performed by fixing or adhering the nonflammable inorganic compound in a layered manner along the inner wall surface of the cell pore. This flameproofing treatment is basically the same as the treatment for the wood veneer described above, so the details will be omitted.

[0020] In this way, a noncombustible wood veneer is obtained in which the noncombustible inorganic compound produced by the reaction between the first liquid and the second liquid is fixed or attached to the inside of the cell pores and/or to the inner wall surface of the cell pores. An adhesive substance is coated onto at least one side of the noncombustible wood veneer using an adhesive coating device such as a splendor, spray, or flow coater. At this time, optional additives such as a water generating agent and a smoke reducing agent can be applied at the same time, if 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.

[0021] After laminating a plurality of noncombustible wood veneers to which an adhesive substance has been applied, pressure bonding is performed using a pressing device such as a hot press or a cold press. At this time, a plurality of wood veneers may be laminated so that the fiber directions are arbitrarily orthogonal, or they may be laminated so that all the fiber directions are the same. A non-combustible laminate is thus obtained.

[0022] An adhesive substance is applied to the surface of the obtained noncombustible laminate using a coating device. The adhesive substance may be the same as mentioned above, and in this case, it is also preferable to add and mix a nonflammable inorganic compound of the same kind or a different kind to that produced by the above-mentioned flameproofing treatment in order to improve fire prevention performance. The same is true. Next, the noncombustible wood veneer obtained in the above process is laminated on the surface of the veneer, and then pressed and bonded using a pressing device to obtain the composite board of the present invention. If necessary, noncombustible wood veneers are laminated and adhered to the front and back surfaces of the noncombustible laminate. 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.

[0023] Above, we have described the method of forming the spring part in a concave shape in the noncombustible wood veneer before it is attached to the noncombustible laminate. After adhering to the surface, the spring portion of the noncombustible wood veneer may be formed into a concave shape by performing a grinding process such as brushing or sandblasting.

[0024]

[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 laminated material, and has a concave-like surface decoration with an excellent wood feel. A non-combustible laminated material that has been treated to make it non-combustible is used as the substrate, and the wood veneer on the surface is also made non-combustible for the spring wood part, which is easy to catch fire due to its low density and has a high burning rate. ,
A decorative board with excellent fireproof 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 plurality of noncombustible wood veneers are laminated and bonded together, and a noncombustible inorganic compound is filled or fixed to the cell pores and/or the inner wall surface of the cell pores of the wood veneer through an adhesive substance. A decorative board characterized in that it is adhered to the surface of a noncombustible laminate made of. 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) A process of filling or fixing a nonflammable inorganic compound into the cell pores and/or the inner wall surface of the cell pores of the wood veneer, and (ii) Laminating a plurality of obtained nonflammable wood veneers via an adhesive substance. A non-combustible laminate is obtained by a step of molding and integrating, and the non-combustible wood veneer is adhered to the surface of the non-combustible laminate via an adhesive substance and integrally molded. Method of manufacturing decorative board. 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 laminate via the adhesive substance, the surface of the noncombustible wood veneer is ground to form the spring material into a recess. The method for manufacturing a decorative board according to claim 3, wherein the decorative board is formed as a. 7. Any one of claims 3 to 6, wherein a noncombustible inorganic compound is added and mixed to the adhesive substance used for adhering the noncombustible wood veneer to the surface of the noncombustible laminate. The method for manufacturing the decorative laminate described in .