JP2014069368A - Woody board, and woody decorative board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a woody board on the surface of which an uneven portion is not formed when used even when water is infiltrated into the inside thereof from the cross section and which can keep excellent exterior appearance and to provide a woody decorative board.SOLUTION: A woody board 13 is formed by using a woody material and a thermosetting resin, has a decorative sheet 11 to be stuck to at least one surface thereof, and includes a high density part 131a which is formed from the surface thereof toward the inside to the thickness direction and has 1.0 g/cmor higher density.

Description

  The present invention relates to a wooden board formed of a wooden material and a thermosetting resin, and a wooden decorative board having a decorative sheet attached to the surface thereof.

  Conventionally, a wooden decorative board in which a decorative sheet is attached to the surface of a wooden board such as a particle board or a medium density fiber board with an adhesive is known, and is widely used as a furniture / building member. Since the wooden board is made of a wooden material such as a wooden chip or a wooden fiber, it has high water absorption. For this reason, just by using an adhesive with a lot of moisture, the wood chips and wood fibers absorb water and expand, and the wood decorative board surface has irregularities shaped like wood chips and wood fibers. May cause poor appearance. In order to prevent this, for example, in Patent Document 1, a low-pressure melamine layer is provided on the surface of a wooden board by hot pressing, and a decorative sheet is attached via the low-pressure melamine layer so that the adhesive does not directly act on the wooden board. An improved wood veneer is disclosed.

JP 2006-272673 A

  However, when a plurality of wooden decorative boards disclosed in Patent Document 1 are used for floor boards, for example, when a chemical such as wax containing a surfactant is used, water absorption from the surface is prevented by the decorative sheet. However, the drug enters from the joint between the wooden decorative boards, and the moisture of the drug soaks into the inside from the cross section of the wooden board due to the influence of the surfactant. Moisture that soaked inside reaches the surface of the wooden board, and as a result, there is a possibility that the wooden chips and the wooden fibers near the surface absorb water and generate irregularities.

  Therefore, the present invention has an object to provide a wooden board and a wooden decorative board that can maintain good appearance without causing irregularities on the surface even when moisture penetrates into the inside from a cross section during use.

The wood board according to the present invention is a wood board formed of a wood material and a thermosetting resin, and a decorative sheet is attached to at least one surface, and the density is increased from the surface toward the inside in the thickness direction. Includes a high-density portion having a density of 1.0 g / cm ³ or more.

According to such a configuration, since the density of the high density portion is set to 1.0 g / cm ³ or more, even if moisture penetrates into the inside from a portion other than the high density portion in the cross section, it reaches the surface. This is suppressed and water absorption of wood chips and wood fibers near the surface can be prevented.

  Moreover, in the wooden board which concerns on this invention, even if it is 9 mm or less in which thickness is thin and a water | moisture content tends to reach | attain the surface, the arrival to the surface of a water | moisture content can be suppressed.

  In addition, in the wood board according to the present invention, by reducing the thickness of the high density portion to 0.5 mm or more and 1.2 mm or less, the weight of the wood board can be reduced while sufficiently suppressing the arrival of moisture. Can do.

  Furthermore, in the wood board according to the present invention, the wood material having the high-density portion has 95% by weight or more of wood chips that pass through a sieve having an opening of 1.00 mm and passes through a sieve having an opening of 0.50 mm. The chip can be configured to have 50 wt% or more. According to this configuration, the surface of the wooden board can be smoothed to improve the appearance.

  Moreover, you may add 10 to 25 weight part of the thermosetting resin of the said high-density part with respect to 100 weight part of said wood materials. According to this configuration, it is possible to improve the workability of the wooden board while sufficiently suppressing the moisture from reaching the surface.

  According to the wood board according to the present invention, even when moisture penetrates into the inside from the cross section during use, the surface is not uneven, and the appearance can be maintained satisfactorily.

  Moreover, according to the wooden board which concerns on this invention, the wooden decorative board which maintains an external appearance favorable can be provided.

It is sectional drawing of the wooden decorative board which concerns on one Embodiment of this invention.

  Hereinafter, a wood decorative board according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a wooden decorative board according to an embodiment of the present invention. As shown in FIG. 1, the wooden decorative board 1 is composed of decorative sheets 11 and 15, adhesives 12 and 14, and particle boards 13 in which the decorative sheets 11 and 15 are attached to both surfaces with adhesives 12 and 14. Is done.

  As the decorative sheets 11 and 15, known ones are used, and examples include thin paper such as paper and titanium paper, impregnated paper, synthetic resin sheets such as polyolefin sheets and vinyl chloride sheets, and precoated paper such as urethane-coated paper. And can be appropriately selected according to the use of the wooden decorative board 1. Further, the thickness of the decorative sheets 11 and 15 can be selected as appropriate according to the strength and the like.

  As the adhesives 12 and 14, known ones are used, which may be water-based adhesives such as water-soluble adhesives or aqueous emulsion adhesives, solvent-type adhesives, etc., and decorative sheets 11 and 15, particles The board 13 can be selected as appropriate. Also, the coating amount can be appropriately selected from the viewpoint of the type and adhesion.

As shown in FIG. 1, the particle board 13 includes three layers of surface layers 131 and 133 and an inner layer 132. The surface layers 131 and 133 include high-density portions 131a and 133a from the surface toward the inside in the thickness direction, and the density of the high-density portions 131a and 133a is set to 1.0 g / cm ³ or more. Is done. Thereby, even if moisture infiltrates inward from the portions other than the high density portions 131a and 133a in the cross section of the particle board 13, the moisture does not reach the surface, and the water absorption of the wood chip near the surface Can be prevented. As a result, it is possible to maintain a good appearance. The thickness of the high density portions 131a and 133a is preferably, for example, 0.5 mm or more and 1.2 mm or less from the viewpoint of preventing moisture from reaching and weight. Further, the thickness of the particle board 13 is preferably, for example, 3 mm or more and 9 mm or less from the viewpoint of strength and weight.

  Next, the material which comprises the particle board 13 is demonstrated. The particle board 13 is mainly composed of a wood material in which wood chips are gathered, a thermosetting resin, an additive, and water.

  As the wood material, the surface layers 131 and 133 include, for example, 95 wt% or more of wood chips that pass through a sieve having an aperture of 1.00 mm and 50 wt% or more of wood chips that pass through a sieve having an aperture of 0.50 mm. used. By using fine wood chips for the surface layers 131 and 133, the high density portions 131a and 133a can be easily formed, and the smoothness of the surface of the particle board 13 can be improved. For the inner layer 132, for example, a wood chip containing 90 wt% or more of a material that passes through a sieve having an aperture of 2.80 mm but does not pass through a sieve having an aperture of 0.50 mm is used.

  Examples of the wood chips include plant materials of conifers such as cedar, cypress, spruce, fur and radiatapine, and broad-leaved trees such as birch, apito, chamelere, sengon, laut and aspen. And as the material of wood chips, for example, logs of these tree species, raw materials such as thinned wood, scraps generated at factories and residential construction sites, waste pallet materials discarded after transportation of members, demolition generated at the time of building demolition Waste materials are used.

  Examples of the thermosetting resin include isocyanate-based, phenol-based, urea-based, and melamine-based resins, and an isocyanate-based resin is preferably used. As isocyanate resins, 4,4'-diphenylmethane diisocyanate (MDI), tolylene diisocyanate (TDI), hexamethylene diisocyanate (HMDI), xylene diisocyanate (XDI), isophorone diisocyanate (IPDI), polymethylene polyphenyl polyisocyanate ( PMDI) and emulsion type PMDI are used, and these are used alone or in combination of two or more. In the surface layers 131 and 133, the thermosetting resin is added in an amount of, for example, 10 parts by weight or more and 25 parts by weight or less with respect to 100 parts by weight of the wood material from the viewpoint of the workability of the wood board and the surface reachability of moisture. 15 parts by weight or more and 25 parts by weight or less are added. In the inner layer 132, for example, 5 parts by weight or more and 10 parts by weight or less are added from the viewpoint of workability and strength of the wooden board.

  Examples of additives include water-resistant agents, tackifiers, aldehyde catchers, curing accelerators, mold release agents, water repellents, emulsifiers, emulsion stabilizers, antioxidants, ultraviolet absorbers, flame retardants, stabilizers, and interfaces. Activators, plasticizers, silane coupling agents, poval, metal catalysts, synthetic rubber latex, acrylic emulsions and the like are used.

  Next, the manufacturing method of the wooden decorative board 1 which concerns on one Embodiment of this invention is demonstrated. First, a predetermined thermosetting resin, an additive, and water are added to the woody material described above to form a mat. This is hot-pressed with a known hot-pressing device to form the particle board 13.

  Then, both surfaces of the obtained particle board 13 are polished with a known sander. Next, the above-mentioned adhesives 12 and 14 are applied to both polished surfaces by a known method, and the above-mentioned decorative sheets 11 and 15 are adhered to obtain the desired wooden decorative board 1.

  Below, the wood decorative board 1 which concerns on this invention is demonstrated concretely by an Example. However, the present invention is not limited to these examples.

[Example 1]
(Surface wood)
2% by weight of wood chips that passed through a sieve with an opening of 1.70 mm but did not pass through a sieve with an opening of 1.00 mm, passed through a sieve with an opening of 1.00 mm, and did not pass through a sieve with an opening of 0.50 mm 100 parts by weight of a wood material containing 43% by weight of wood chips and 55% by weight of wood chips that have passed through a sieve having an aperture of 0.50 mm was prepared. .8 parts by weight, and further, water was added so that the moisture content of the mat was 13% to prepare a wood material for the surface layer.

(Wood material for inner layer)
7% by weight of wood chips that passed through a sieve with an opening of 4.75 mm but did not pass through a sieve with an opening of 2.80 mm, passed through a sieve with an opening of 2.80 mm, and did not pass through a sieve with an opening of 0.50 mm Prepare 100 parts by weight of a wood material containing 91% by weight of wood chips and 2% by weight of wood chips that have passed through a sieve with an aperture of 0.50 mm, 8 parts by weight of an isocyanate adhesive (PMDI), and a wax emulsion as a water resistant agent. Water was added so that the water content of the mat was 0.8% by weight and the mat moisture content was 9% to prepare a wood material for the inner layer.

The prepared wood material was made into a surface layer / inner layer / surface layer (weight ratio 1: 3: 1), formed into a mat, and then subjected to hot pressing with a hot press machine (hot plate temperature: 200 ° C., pressure: 4 N / mm). ² and pressurization time: 108 sec), and a particle board having a set density of 0.75 g / cm ³ , length 320 mm × width 320 mm × thickness 9 mm was produced.

By polishing the both surfaces of the particle board prepared, these water-based emulsion adhesive (Konishi Co., CVC360) 6g / scale ² was coated with a roll coater, put the polyolefin sheet (thickness 160 .mu.m), room temperature 23 The wood decorative board was produced by pressing and adhering at 5 ° C. and a pressure of 1.0 N / mm ² for 5 minutes.

[Example 2]
In the same manner as in Example 1, wood materials for the surface layer and the inner layer were prepared. After preparing the surface layer / inner layer / surface layer (weight ratio 1: 2: 1) and forming the mat for the surface layer and the inner layer woody material, hot pressing with a hot press apparatus (hot plate temperature: 200 ° C.) , Pressure: 4 N / mm ² , pressurization time: 108 sec), and a particle board with a set density of 0.80 g / cm ³ , length 320 mm × width 320 mm × thickness 9 mm was produced. In the same manner as in Example 1, a polyolefin sheet was adhered to both surfaces to produce a wood decorative board.

[Example 3]
In the same manner as in Example 1, wood materials for the surface layer and the inner layer were prepared. The prepared wood material for the surface layer and the inner layer was formed into a surface layer / inner layer / surface layer (weight ratio 1.5: 7: 1.5), formed into a mat, and then subjected to hot press molding (hot plate) with a hot press machine A particle board having a set density of 0.80 g / cm ³ , a length of 320 mm × a width of 320 mm × a thickness of 9 mm was prepared by performing temperature: 200 ° C., pressure: 4 N / mm ² , and pressurization time: 108 sec. In the same manner as in Example 1, a polyolefin sheet was adhered to both surfaces to produce a wood decorative board.

[Comparative Example 1]
In the same manner as in Example 1, wood materials for the surface layer and the inner layer were prepared. After preparing the surface layer / inner layer / surface layer (weight ratio 1: 3: 1) and forming the mat for the surface layer and the inner layer, the formed wood material is subjected to hot press molding (hot plate temperature: 200 ° C.). , Pressure: 4 N / mm ² , pressurization time: 108 sec), and a particle board having a set density of 0.70 g / cm ³ , length 320 mm × width 320 mm × thickness 9 mm was produced. In the same manner as in Example 1, a polyolefin sheet was adhered to both surfaces to produce a wood decorative board.

(Cross section density measurement)
In order to make a test piece, the produced wooden decorative board was cut into a length of 50 mm and a width of 50 mm. This was set in an X-ray density meter (DPX300-LTE) manufactured by iMAL, and the cross-sectional density in the thickness direction of the particle board was measured. And from the obtained data, the thickness of the high-density part with a density of 1.0 g / cm ³ or more was measured.

(Wax resistance test)
In order to make a test piece, the produced wooden decorative board was cut into a length of 150 mm and a width of 50 mm. As a wax, a high-tech flooring coat manufactured by Linley Co., Ltd. was prepared. These test pieces and wax were left under 23 ° C. and 50% RH environmental conditions for one day or longer. This wax was put into a beaker, and a test piece was immersed in the beaker to a depth of 50 mm and left for 1 minute. The test piece was taken out, the adhered wax was wiped off, and dried for 10 minutes with a 60 ° C. hot air dryer. Thereafter, this test piece was taken out and left in an environment of 23 ° C. and 50% RH for 30 minutes. Then, the appearance of this test piece was observed, and the appearance was evaluated as x where the surface irregularities were conspicuous, Δ where the surface irregularities were not conspicuous, and ○ where the surface irregularities were not conspicuous. The results of density measurement and wax resistance test are summarized in Table 1.

As shown in Table 1, the density of the entire particle board was 1.0 g / cm ³ or less. And when the thickness of the high-density part which is the comparative example 1 was 0.0 mm, the unevenness | corrugation generate | occur | produced on the surface and the unevenness | corrugation was conspicuous. On the other hand, when the thickness of the high density portion of Example 3 was 0.2 mm, it was difficult to notice the slight unevenness. And when the thickness of the high-density part which is Example 1 was 0.6 mm and 0.8 mm which was Example 2, unevenness did not occur. As a result, by including a high-density portion having a density of 1.0 g / cm ³ or more, it is possible to suppress the occurrence of surface irregularities, and by suppressing the thickness to 0.5 mm or more, it is sufficiently suppressed. I was able to.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible unless it deviates from the meaning. For example, in the above embodiment, the particle board 13 is used as the wood board, but a medium density fiber board or the like can be used.

  Moreover, in the said embodiment, although the decorative sheets 11 and 15 are affixed on both surfaces of the particle board 13, according to the use of the wooden decorative board 1, you may affix on only one side.

  Moreover, in the said embodiment, although it comprises so that some surface layers 131 and 133 may become the high-density parts 131a and 133a, the surface layers 131 and 133 and the high-density parts 131a and 133a may correspond, Moreover, you may comprise so that a part of inner layer 132 and surface layer 131,133 may become the high-density part 131a, 133a. Furthermore, in the above-described embodiment, the particle board 13 is configured by three layers of the surface layers 131 and 133 and the inner layer 132. However, the particle board 13 may be configured by a single layer, two layers, four layers or more.

1 Wood decorative board 11, 15 Decorative sheet 12, 14 Adhesive 13 Particle board (wood board)
131, 133 Surface layers 131a, 133a High density portion 132 Inner layer

Claims (7)

A wood board formed of a wood material and a thermosetting resin, and having a decorative sheet attached to at least one surface thereof,
A wooden board including a high density portion having a density of 1.0 g / cm ³ or more from the surface toward the inside in the thickness direction.   The wooden board according to claim 1, wherein the thickness is 9 mm or less.   The wood board according to claim 1 or 2, wherein a thickness of the high density portion is 0.5 mm or more and 1.2 mm or less. The wood board according to any one of claims 1 to 3, wherein the density is 1.0 g / cm ³ or less.   The wood material of the high-density portion has 95 wt% or more of wood chips that pass through a sieve having an opening of 1.00 mm and 50 wt% or more of wood chips that pass through a sieve having an opening of 0.50 mm. To 4 in the wood board.   6. The wood board according to claim 1, wherein the thermosetting resin of the high density part is added in an amount of 10 parts by weight to 25 parts by weight with respect to 100 parts by weight of the wood material.   A wooden decorative board comprising a decorative sheet and the wooden boat according to claim 1.

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