JPH07137001A - Surface decorative lignified plate - Google Patents

Abstract

PURPOSE:To provide a surface decorative lignified plate in which a surface is smooth and preferable in beauty and which has excellent moisture resistance and water resistance. CONSTITUTION:A hard sheet 4 having a smooth surface and a decorative material 5 are laminated on one side surface of a laminated lignified plate 6 in which a directional wood thin piece glued laminated plate 3 is laminated on a wood thin piece glued laminated plate 2 at the plate 3 side. As the sheet 4, a thermosetting resin-impregnated cured sheet in which a sheetlike base material is impregnated with thermosetting resin is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface-decorated wood board which is excellent in surface smoothness and is aesthetically pleasing, and is also excellent in water resistance and moisture resistance, which is used for interior materials such as houses.

[0002]

2. Description of the Related Art In recent years, shortage of timber resources and protection of forests have become problems, and it is clear that deforestation will become more difficult in the future. Therefore, it is expected that the supply of plate materials such as plywood manufactured by using a large amount of raw wood will be unstable or insufficient, and the price will also rise. For this reason, a directional timber laminated plate called OSB (ORIENTED STRAND BOARD), which utilizes thin wood and small-diameter wood flakes that have been conventionally scrapped, is being used instead of plywood.

[0003] A directional wood flakes laminated plate using the wood flakes is generally formed by adhering wood flakes, which are raw materials, with a binder and molding and integrating them. At that time, as the size of the raw material becomes smaller, the obtained directional wood thin plate laminated plate becomes uniform and the surface becomes smooth, but the strength and rigidity decrease and the density increases. On the contrary, when the size of the raw material is increased, the strength and density that the original wood has are approached, but such a directional wood thin plate laminate tends to be inhomogeneous and the surface unevenness tends to increase. Also, in order to use it as an interior material for a house, surface cosmetic properties are required,
It is necessary to attach a decorative material such as a decorative veneer to the surface of the laminated wood thin plate.

However, in the case where a thin decorative material is adhered, for example, a floor material to which a thin decorative veneer is adhered or a color panel to which a vinyl chloride printing film is adhered, the surface of the directional wood thin laminated plate is used. There was a problem that the unevenness of the above appeared on the surface of the decorative material, and further, the chip pattern peculiar to the directional wood thin plate laminated plate was seen through, which was not preferable aesthetically.

The surface irregularities are temporarily smoothed by sanding, but such a directional wood thin plate laminate has high hygroscopicity and water absorbency, and when moisture is absorbed, the stress is relieved and the irregularities are again formed. There is a problem in that it may occur or the dimensions may be rounded. Furthermore, due to the difference in the degree of swelling and shrinkage of individual wood flakes due to moisture absorption and dehumidification, it has been difficult in some cases to attach the decorative material to the directional wood lamina laminate.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of these circumstances, and is composed of a directional wood thin plate laminated plate and a decorative material adhered to the laminated plate, and has a smooth surface and is aesthetically pleasing. In particular, it is an object of the present invention to provide a surface-decorated wood board that is excellent in moisture resistance and water resistance.

[0007]

Means for Solving the Problems The purpose is to provide a hard wood sheet having a smooth surface on one surface of a laminated wood board in which a directional wood thin piece laminated board is laminated on a directional wood thin piece laminated board. The problem can be solved by laminating a decorative material after laminating. Further, as the hard sheet, it is preferable to use a thermosetting resin-impregnated and cured sheet obtained by impregnating and curing a thermosetting resin in a sheet-shaped base material.

[0008]

Function: By laminating a hard sheet having a smooth surface between the directional wood flakes laminated plate and the decorative material, the decorative material laminating surface of the directional wood flakes laminated plate becomes smooth. Further, the hard sheet prevents water from permeating into the inside of the wood thin plate laminated plate and the directional wood thin plate laminated plate.

[0009]

EXAMPLE Next, the surface decorative wood board of the present invention will be described in detail. FIG. 1 shows an example of a surface decorative wood board 1 of the present invention. This is a laminated wood board 6 in which a directional wood thin piece laminated board 3 which is a surface layer is laminated on both surfaces of a wood thin piece laminated board 2 which is a core layer, and one surface of the directional wood thin piece laminated board 3 is further formed. The hard sheet 4 and the decorative material 5 are laminated in this order.

The laminated wood thin plate 2 serving as the core layer has a thickness of 0.
A thin wood piece of 4 to 0.8 mm is adhered with a binder and integrally molded. This piece of wood has a length of 2
It is preferable that the width is 0 to 100 mm and the width is 2 to 60 mm. As these wood flakes, flakes such as red pine, larch, ezo pine, todo pine, aspen, lodgepole pine, and the like are preferably used, but the tree species is not particularly limited.

These wood flakes are preferably glued together and molded together by means of a foamable binder. This foamable binder is used to bond the wood flakes to each other in the wood flakes assembly plate 2 and to foam itself, and preferably the resin component is present only at the intersections of the wood flakes, and By using a foam cell to spread a small gap, the amount of the resin component used can be reduced and the density of the wood thin laminated plate 2 can be reduced. Furthermore, the foamable binder also improves the water resistance and moisture resistance of the thin wood laminated plate 2.

Examples of these foamable binders include self-foaming foamable polyurethane resins, polyurethane resins foamed by a foaming agent, polystyrene resins, epoxy resins, polyvinyl chloride resins, phenol resins, urea resins and mixtures thereof. Examples of the foaming agent include volatile foaming agents such as CCl ₃ F, CCl ₂ F ₂ and C.
Cl ₂ F-CClF ₂ or the like and a thermally decomposable foaming agent such as azodicarbonamide, azohexahydrobenzonitrile, 2,2′-azoisobutyronitrile, benzenesulfohydrazide, or N, N′-dinitroso N,
N'- dimethyl terephthalamide etc. can be mentioned. The ratio of the foamable binder to the wood flakes is 5 to 3 with respect to 100 parts by weight of the wood flakes.
The content is preferably 0 part by weight, but if the proportion of the expandable binder is large, the water resistance and moisture resistance are improved, but since the weight is increased, it may be determined in consideration of the balance between both performances.

Further, the thickness of the laminated thin wood plate 2 is 5
It is preferable to be 13 mm, and the density is 0.40.
It is preferably 0.65 g / cm ³ . Density 0.4
This is because if it is less than 0 g / cm ³ , the strength of the plate becomes insufficient, and conversely if the density is more than 0.65 g / cm ³ , the weight of the entire material increases and handling becomes difficult.

A directional wood thin plate laminated plate 3 serving as a surface layer
Has a thickness of 0.4 to 0.8 mm, a length of 20 to 100 mm,
Thin wood pieces having a width of 2 to 60 mm are aligned and arranged in a substantially constant direction, and are integrally formed by a binder. As the binder used at this time, the foamable binder as described above may be used, or the non-foamable binder or a mixture thereof may be used, but practically, it is separated from the molding die. From the viewpoint of moldability, those mainly containing a non-foaming binder are preferable. The mixing ratio of them can be appropriately changed in consideration of the density and releasability of the target directional wood thin plate laminate 3.

The ratio of the binder to the wood flakes in the directional wood flakes laminated plate 3 is determined as follows:
It is preferably 5 parts by weight or more with respect to 00 parts by weight. When the amount of the binder added is 5 parts by weight or less with respect to 100 parts by weight of the wood flakes, the strength of the obtained directional wood flakes laminated plate 3 becomes insufficient.

The thickness of the directional wood thin plate laminate 3 is 1 to 7 mm, preferably 3 to 4 mm. further,
The density of this directional wood laminated plate 3 is 0.40 to 0.6.
It is preferably 5 g / cm ³ . Density 0.40 g /
If it is smaller than cm ³ , the strength of the plate becomes insufficient, and if the density is larger than 0.65 g / cm ³ , on the contrary, the weight of the whole material increases and the handling becomes difficult.

Further, in order to impart moisture resistance and water resistance to the directional wood flakes laminated plate 3 serving as the surface layer, it is preferable to acetylate the wood flakes as a raw material in advance. When acetylating wood flakes, the wood flakes should have a water content of 3%.
Hereafter, it is preferable that after drying to 1% or less, contact with vaporized vapor such as acetic acid, acetic anhydride or chloroacetic acid to acetylate (acetylation degree 12 to 20%) in the vapor phase.

The hard sheet 4 is a sheet-shaped base material impregnated with a thermosetting resin. As the sheet-shaped substrate, any one can be used as long as it has a smooth surface and can be impregnated with the thermosetting resin, such as paper, cloth, and non-woven fabric, but it is particularly preferably made of paper. The paper type is arbitrary. As the thermosetting resin, phenol resin, urea resin, melamine resin, polyester resin and the like are used. Further, the hard sheet 4 is preferably colored in any color according to the color of the laminated wooden board 6 or the decorative material 5, or is opaque such as an emulsion color. Further, the thickness of the hard sheet 4 is preferably 0.2 to 1.5 mm. If this is 0.2 mm or less, the rigidity is poor,
The effect of smoothing the unevenness of the surface of the directional wood thin plate laminate 3 is reduced. Further, even if the thickness is 1.5 mm or more, it does not contribute to the improvement of moisture resistance and water resistance, and the hard sheet 4
This is because there is a possibility that the weight of the surface-added wooden board increases and it causes warpage of the surface-decorated wooden board 1.

As the decorative material 5, known materials such as a decorative veneer, a printed resin film, a decorative paper, and a cloth can be used. As the decorative veneer, tree species such as oak, cypress, teak, walnut and spruce are used, and those having a thickness of about 0.15 to 0.8 mm are used. A decorative veneer having a thickness of 0.2 to 0.3 mm is preferable because it has an effect on the use of the plate. Further, the water content of this product is preferably about 7 to 8%. If the water content is higher than this, not only the adhesive effect is lowered, but also the water content of the adhesive is added, so that a warp occurs when the water content is exchanged with the laminated wood board 6. Further, if the water content is too low, the decorative veneer is broken during the work to cause loss, which hinders work efficiency. The thickness of the printing resin film is 0.2 to 0.
A 5 mm polyester film, a printed resin film obtained by printing a beautiful pattern on a vinyl chloride film, or the like is used. Further, as the decorative paper or cloth, any one such as patterned paper can be used according to the purpose of use. The thickness is preferably 0.1 to 0.5 mm. Further, the types of the decorative material 5 are not limited to those listed here, and any one can be used depending on the application of the surface-decorated wood board 1.

Next, an example of a method for manufacturing the surface decorative wood board 1 of the present invention will be described. First, a non-foaming binder is applied on the laminated wood board 6 formed on the hot pressing plate so that the long sides of the wood flakes are substantially parallel to each other. The wood flakes to be the core layer coated with are spread, and further the wood flakes to be the surface layer coated with the non-foaming binder are sprayed so as to be aligned in the same direction as the other surface layer to form a three-layer laminate. Next, hot pressing is applied to the three-layer laminate in a hot pressing machine to perform hot pressing simultaneous molding. The hot-pressing condition is that the pressure is 1 to 2 MPa and the temperature is 1
50 to 200 ° C., time target thickness (mm) × 5
It is preferably 120 seconds.

Then, 120 to 150 g / m ^{2 of} an adhesive such as urea resin or rubber-modified melamine / urea resin is applied to the surface of the laminated wooden board 6 formed as described above, and a hard sheet is further applied thereon. 4 stacked, about 110 ℃
Then, a pressure of 10 kg / cm ² is applied, and a heat and pressure treatment is applied for about 3 minutes to obtain a wood board-hard sheet laminate. Then, 120 to 150 g / m ^{2 of} an adhesive such as urea resin or rubber-modified melamine / urea resin is applied on the hard sheet 4 of the wooden board-hard sheet laminate, and the decorative material 5 is further laminated thereon. Then, heat and pressure treatment is performed under the same heat and pressure conditions as described above to bond them. Any of the above-mentioned adhesives can be used as the adhesive for attaching the decorative material 5, but in order to reduce the exudation to the decorative material 5, a rubber-modified melamine-urea resin adhesive is used. Is preferred.

The surface-decorated wood board 1 thus obtained
Is a laminated wood board 6 in which a directional wood thin plate laminated plate 3 and a directional wood thin plate laminated plate 3 are laminated, and a hard sheet 4 having a smooth surface and a decorative material 5 are laminated on one surface of the laminated wooden board 6 on the directional wood thin laminated plate 3 side. ,
Particularly, as the hard sheet 4, a thermosetting resin-impregnated and hardened sheet obtained by impregnating a sheet-shaped base material with a thermosetting resin is used.
Since the surface to which the decorative material is adhered is smooth, no unevenness of the surface of the directional wood thin piece laminated material 3 appears on the surface of the decorative material 5, the surface smoothness is improved, and the directional wood thin laminated board 3 The chip pattern is not visible and is aesthetically pleasing. Further, since the hard sheet 4 prevents water from permeating into the wood thin laminated plate 2, the surface decorative wood plate 1 is improved in moisture resistance and water resistance and is excellent in dimensional stability.

The laminated wood board 6 used in the present invention
Is a laminated wood thin plate 2 which is a core layer molded and integrated by using a foamable binder and a directional wood thin plate laminated plate 3 which is a surface layer which is molded and integrated by using a non-foaming binder. Therefore, the wood thin piece laminated plate 2 which is the core layer has a low density and is lightweight, and the directional wood thin laminated plate 3 which is the surface layer is formed.
Is higher in density and strength than the wood thin laminated plate 2 which is the core layer,
Since the laminated wooden board 6 has high rigidity, the laminated wooden board 6 has a low density, high strength, and high rigidity when viewed as a whole.

Further, the structure of the laminated wooden board 6 may be a two-layer laminated body in which the directional wooden thin piece laminated board 3 is laminated only on one surface of the wooden thin piece laminated board 2 in addition to the above example. Further, it may be a five-layer laminate in which two layers of the directional wood flakes laminated plate 3 are laminated on both sides of the wood flakes laminated plate 2 to be the core layer. In this case, it is preferable to arrange the wood thin pieces of the adjacent directional wood thin plate assembly plates 3 so that the wood thin pieces are arranged in mutually orthogonal directions. In this way, the laminated wood board 6 is formed by laminating an arbitrary number of directional wood thin piece laminated boards 3 on one side or both sides of the wood thin piece laminated board 2 as the core layer so as to have the optimum strength according to the application. You can

Further, the core layer may also be the directional wood thin plate laminate 3. Also in this case, it is preferable that the wood flakes to be the core layer are molded and integrated using a foamable binder to form the directional wood flakes laminated plate 3 having a low density. In addition, as a raw material for the directional wood laminated plate 3 which is the surface layer, the thickness is 0.3 m.
When wood flakes of m or less are used, directional wood flakes laminated plate 3
The surface smoothness is increased, the hard sheet 4 and the decorative material 5 are easily attached, and the surface-decorated wood board 1 having excellent surface smoothness can be obtained.

The effects of the present invention will be clarified below by showing specific examples. (Specific example) First, as a material of the wood thin laminated plate 2, a thickness of 0.4 to 0.8 mm, a length of 20 to 100 mm, and a width of 2 to 6
Prepare a 0 mm thin piece of wood, put 100 parts by weight of the above-mentioned thin piece of wood in a rotating drum that rotates at a low speed, and when it spontaneously falls in the drum, expandable urethane resin (crude MDI manufactured by Sumitomo Bayer Urethane Co., Ltd.) Foamable binder 1
By spraying 0 part by weight of a spray, a wood flakes coated with a foamable binder was obtained.

Next, as a material for the directional wood thin plate laminate 3, the thickness is 0.4 to 0.8 mm and the length is 20 to 100 m.
m, width 2 to 60 mm, a thin piece of wood is prepared, 100 parts by weight of the thin piece of wood is placed in a rotating drum that rotates at a low speed, and when it naturally falls in the drum, a non-foaming binder made of an aqueous phenol binder. By spraying 10 parts by weight with a spray, a wood flakes coated with a non-foaming binder was obtained.

Then, half of the wood flakes coated with the non-foaming binder are sprinkled on a hot pressing plate so that the arrangement direction of the wood flakes is almost constant, and the wood coated with the foaming binder is applied on top of it. Spread the flakes. On top of that, the wood flakes coated with the remaining non-foaming binder,
The thin wood pieces were scattered so that the direction of arrangement was almost constant, and a laminate having a thickness of 250 mm was obtained. The laminate is
mm, temperature 160 ° C, pressure 20 kg / cm
² Simultaneously hot-pressing for 20 minutes to obtain a laminated wood board 6.

Then, after coating 120 to 150 g / m ² of urea resin on one surface of the laminated wood board 6, the thickness of the laminated wood board 6 is reduced to 0.
1mm kraft pulp paper impregnated with phenolic resin,
After stacking three sheets of this impregnated paper, a hard sheet 4 which was heated and cured by a press was stacked. Further, this was heat-pressed under the conditions of a temperature of 110 ° C. and a pressure of 10 kg / cm ² , and the laminated wood board 6 and the hard sheet 4 were adhered to each other to obtain a wood board-hard sheet laminate.

Next, 120 to 150 g of a rubber-modified melamine-urea resin adhesive is added to the wooden board-hard sheet laminate.
/ M ² applied, and further laminated with a veneer veneer 5 of oak having a thickness of 0.3 mm and a water content of 7%, and subjected to hot pressure treatment under the conditions of a temperature of 110 ° C. and a pressure of 10 kg / cm ^2. The decorative veneer 5 was attached to the wooden board-hard sheet laminate. The surface of the surface-decorated wood board 1 thus obtained was smooth, and no chip pattern of the directional wood thin plate assembly 3 was recognized. Also, when comparing the lengths in the water-saturated state and the absolutely dried state, the difference of the present invention was about 0.05 mm per 1 m on average.

(Comparative Example) Except that the hard sheet 4 is not used,
A surface decorative wood board was obtained in the same manner as in the example. In this product, the chip pattern of the directional wood thin plate laminate 3 was seen through. Furthermore, when comparing the lengths in a water-saturated state and an absolutely dry state, an average of 0.2 mm was produced per 1 m.

[0032]

As described above, the surface-decorated wood board of the present invention is a laminated wood board in which a directional wood thin piece laminated board is laminated on a wood thin piece laminated board, on one surface of the directional wood thin laminated board side.
A hard sheet and a decorative material are laminated, and in particular, as the hard sheet, a thermosetting resin-impregnated cured sheet obtained by impregnating a sheet-shaped base material with a thermosetting resin is used. Since the surface of the board to which the decorative material is attached is smooth, no unevenness on the surface of the directional wood thin laminated plate appears on the surface of the decorative material, and the surface smoothness is improved. Further, the chip pattern of the directional wood thin plate laminate is not seen through, which is aesthetically preferable. Furthermore, since the hard sheet prevents the permeation of water into the wood thin laminated plate, the surface decorative wood plate has improved moisture resistance and water resistance, and is excellent in dimensional stability.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the structure of a surface decorative wood board of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Surface decorative wood board, 2 ... Wood thin piece laminated board, 3 ... Directional wood thin piece laminated board, 4 ... Hard sheet, 5 ... Decorative material, 6 ... Laminated wooden board

Claims (2)

[Claims] 1. A hard sheet having a smooth surface and a decorative material are laminated on one surface of a laminated wood board in which a directional wood thin plate laminated plate is laminated on a directional wood thin plate laminated plate. Surface wood board to be 2. The surface-decorated wood board according to claim 1, wherein a thermosetting resin-impregnated and cured sheet obtained by impregnating and curing a thermosetting resin in a sheet-shaped substrate is used as the hard sheet.