JPH09216206A - Woody decorative sheet and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use an optional bonding agent for bonding a woody base with a decorative sheet and eliminate the possibility of generation with time of muddiness after the manufacture by sticking the decorative sheet on the surface of the woody base on which the dimension stabilizing process is applied and, if necessary, the surface grinding is applied thereon. SOLUTION: The surface grinding is applied, if necessary, on a woody base on which the dimension stabilizing process is applied preliminarily, and then a decorative sheet is stuck on. The dimension stabilizing process for the woody material is carried out by storing, for instance, U-type coniferous fibers MDF 20 in a stainless pressure vessel main body 10, sealing the pressure vessel by a cover 11, and placing the sealed pressure vessel between plane platen presses with hot platens 1 and 2 as press platens and applying the hot water vapor treatment in the state of clamping the pressure vessel between press platens. Heating is carried out at 200 deg.C for 30 minutes. The container is cooled by cooling water for 15 minutes after heating, and the pressure is released and the press platens are separated to take out the woody base from the inside of the pressure vessel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wooden decorative board and a method for manufacturing the same, and in particular, particle board, MDF,
A so-called makeup such as thin paper, thin resin sheet, or pre-coated paper on the surface of a wood base material such as OSB or wafer board, or a wood base material artificially formed into a plate shape using other small pieces of plant fiber as a base material. The present invention relates to a wooden decorative board having a sheet attached thereto and a surface makeup applied thereto, and a method for producing the same.

[0002]

[Prior Art and Problems] Particleboard, MD
A wooden decorative board in which a so-called decorative sheet such as paper, thin resin sheet, pre-coated paper, etc. is attached to the surface of a wooden base material such as F, OSB or wafer board is known, and is used as a furniture material or a building material. Widely used. However, on the other hand, the base material, wood, has a higher expansion and contraction rate due to moisture absorption and release than ordinary plywood, and lacks dimensional stability. There is a case that the wood material is expanded and chip duck or fiber duck occurs immediately after the bonding. Further, chip duck and fiber duck also occur due to external changes such as humidity after bonding and changes with time.

Therefore, as adhesives used for bonding, ethylene-vinyl acetate adhesives and solvent-type adhesives (epoxy adhesives, urethane adhesives) having a low water content are mainly used at present. Common adhesives, for example emulsion adhesives such as vinyl acetate emulsions, are not used. Even in this case, it is impossible to avoid the influence of humidity and moisture after the production, which causes not only the occurrence of duck but also the problem of warpage due to moisture absorption and release of the wood base material.

[0004]

DISCLOSURE OF THE INVENTION The present invention is intended to eliminate the above-mentioned disadvantages of the decorative board using an untreated wood material as a base material and the manufacturing method thereof. Specifically, any adhesive can be used as an adhesive for laminating a wooden base material and a decorative sheet, and duck does not occur over time after production, and the wooden decorative board and its The purpose is to obtain a manufacturing method.

[0005]

[Means for Solving the Problems] At present, in order to suppress the deformation due to moisture absorption and release of wood materials and stabilize the shape as described above, stabilization by chemical treatment, thermal or heat steam treatment is used. Various proposals such as stabilization have been made and implemented. As the chemical treatment, a method of substituting a hydrophilic OH group in wood with a hydrophobic group (acetylation), a method of causing cross-linking in the OH group (formalization), and the like are known. Alternatively, as the heating steam treatment, a method of leaving it in a dryer for a long time, a method of treating it with high-pressure steam in an autoclave for a short time (for example, JP-A-4-12).
No. 6202, etc.), a method in which a compression-molded wood material in a closed pressure vessel is heated in a state in which deformation is constrained and water inside the wood material is converted into high-pressure steam to be treated (for example, JP-A-6-
Further, a method for heating and steaming a wood material by sandwiching and heating the wood material in a hermetically sealed state between hot plates and heating the wood material to steam under high pressure (for example, JP-A-6-238617, JP-A-7-47511, etc.) are known. These methods are commonly known as "dimensional stabilization treatment" methods.

The present invention is characterized in that the above-mentioned wood material subjected to the dimension stabilization treatment is used as the base material of the wood decorative board, and the surface of the wood substrate subjected to the dimension stabilization treatment is applied. Laminate a decorative sheet, which is characterized in that a decorative sheet is pasted, and a wooden base material that has been subjected to dimensional stabilization treatment beforehand, after surface polishing as necessary, and then pasting the decorative sheet Disclosed is a method for manufacturing a wooden decorative board.

The wood base material is particle board,
Currently known wood materials such as MDF, OSB, and wafer board can be optionally used. There is also no particular limitation on the dimension stabilization treatment performed on the wood material, and any treatment method conventionally used such as chemical treatment, thermal treatment, or high-pressure steam treatment may be applied. obtain. Among them, the dimension stabilization method by the method of heating and steaming the wood material by sandwiching and heating the wood material in a sealed state between the above-mentioned heating plates and steaming the water contained in the wood material itself under high pressure is It is particularly effective in that the inside of the wood material can be uniformly processed in a short time.

As for the degree of dimensional stabilization treatment, it is desirable to treat it until it has a water resistance performance equal to or greater than that of plywood, but it has a slight treatment effect as compared with the untreated (blank) one. May be. The method of attaching the decorative sheet to the wood base material subjected to the dimension stabilization treatment is arbitrary, and after applying an adhesive to the front surface of the wood base material or the back surface of the decorative sheet or both, pressure bonding or thermocompression bonding is performed. Alternatively, a decorative sheet impregnated with a resin such as a melamine resin may be used for simultaneous hot-press bonding. You may make it stick after surface-polishing, such as sanding and router processing.

The type of adhesive to be applied is not limited, and may be any water-soluble or water-based adhesive, any solvent-type adhesive, and the like. Further, the amount of adhesive applied and the application device may be appropriately selected empirically in consideration of the type of wood base material and the type of decorative sheet to be attached. The type of decorative sheet is also arbitrary, and it is conventionally used 20 to 50 g / m ^2.
It may be paper of a certain degree, thin paper such as titanium paper, impregnated paper, synthetic resin sheet such as vinyl chloride sheet, pre-coated paper such as urethane coated paper, etc., and their surface is coated with any makeup. It may be one. The thickness is also arbitrary.

According to the method for manufacturing a wooden decorative board according to the present invention, it is not necessary to use a specific adhesive as in the conventional method, which brings about a cost advantage and the manufactured wooden decorative board. There is no dullness or blistering on the surface, and the surface finish is smooth. Even after the production, the surface smoothness is maintained for a long time without being affected by humidity and moisture.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to examples. [Example 1] As a substrate to be used, U-type particle board subjected to dimension stabilization treatment by heat treatment at 180 ° C for 15 hours by a drier was used. After polishing the surface of this wood base material with a wide belt sander, an aqueous vinyl acetate adhesive was applied at an application amount of about 4 g / square ² , and a urethane precoated decorative paper with a thickness of 0.02 mm was applied at 10 kgf / cm 2. Pressed with ² and pasted together.

[Example 2] The substrate used, the treatment, and the bonding conditions were the same as in Example 1, but 80% of the adhesive was urea resin, and a mixed type adhesive of urea resin and aqueous vinyl acetate was used. did.

[Comparative Example 1] As a base material, a commercially available U-type particle board which was not subjected to dimension stabilization treatment was used, and urethane-coated paper was laminated in the same manner as in Example 1.

[Comparative Example 2] As a base material, a U-type particle board in a commercially available state, which was not subjected to dimension stabilization treatment, was used, and urethane-coated paper was laminated in the same manner as in Example 2.

[Example 3] As a substrate to be used, a softwood fiber U type MDF which was subjected to a formalization treatment at 120 ° C for 24 hours in a heat resistant pressure tank was used. The formalization process is
Paraformaldehyde 80g in a 30 liter tank,
Performed with 5 liters of SO ₂ . After polishing the surface of this wood base material with a wide belt sander, urethane modified vinyl resin was applied at an application amount of about 10 g / scale ² , and then,
1kgf / cm ^{2 of} 0.1mm thick vinyl chloride sheet
It was clamped and stuck together.

[Example 4] The base material used, the treatment, and the bonding conditions were the same as in Example 3, but 50% of the adhesive was urea resin, and a mixed adhesive of urea resin and urethane modified vinyl resin was used. And

[Comparative Example 3] As a base material, a commercially available softwood fiber U type MDF which is not subjected to dimensional stabilization treatment
Using, the vinyl chloride sheet was stuck in the same manner as in Example 3.

[Comparative Example 4] As a base material, a commercially available softwood fiber U type MDF which is not subjected to dimensional stabilization treatment
Was used and a vinyl chloride sheet was attached in the same manner as in Example 4.

[Embodiment 5] As shown in FIG. 1, a commercially available softwood fiber U type MDF 20 is housed in a pressure-resistant container body 10 made of stainless steel, and the pressure-resistant container is sealed by a lid 11, which is used as a press board. It was placed between flat plate presses having hot plates 1 and 2, and heated steam treatment was performed with the pressure vessel being sandwiched between the press plates. Heating at 200 ℃ 3
Performed in 0 minutes. After heating, it was cooled with cooling water for 15 minutes, decompressed, the press plate was separated, and the wood base material was taken out from the pressure resistant container. In FIG. 1, 4 is a heater for heating and 12 is a sealing packing material. After polishing the surface of the wooden base material 20 with a wide belt sander, a vinyl chloride sheet was attached in the same manner as in Example 3.

[Evaluation] The appearance (existence of dullness and swelling) and the performance test were performed for each. The items and results are shown in Table 1.

[0021]

[Table 1]

In Table 1, the test method for each test item is as follows.

Cold cold B test: test piece at 80 ± 3 ° C
After leaving it in the incubator for 2 hours and then leaving it in the incubator at −20 ± 3 ° C. for 2 hours, the process is repeated twice, and left to reach room temperature.・ Water-resistant repeated B test: 1 in a hot water of 60 ± 3 ℃
After soaking for 2 hours, the step of drying for 2 hours in an incubator at 60 ± 3 ° C. is repeated twice, and left to reach room temperature. The criteria for judging each item in Table 1 are shown in Tables 2 and 3.

[0024]

[Table 2] -Appearance

[0025]

[Table 3] ・ About test items

As shown in Table 1, it can be seen that the wooden decorative boards of the examples meet all the evaluation items of the appearance and performance tests, and can be sufficiently used as decorative boards. On the other hand, the one in which the decorative sheet is directly attached to the surface of the base material without performing the dimensional stabilization treatment obviously has disadvantages and is insufficient for use as a product.

[0027]

EFFECTS OF THE INVENTION According to the method for manufacturing a wooden decorative board of the present invention, it is not necessary to use a specific adhesive as in the conventional method, and the cost advantage is brought about.
The surface of the manufactured wood veneer is smooth, with no dullness or blistering. Even after the production, it is possible to obtain a stable decorative board which is not affected by humidity and moisture and whose surface smoothness can be maintained for a long time. In particular, when the dimension stabilization treatment is a heating steam treatment, a stable decorative board capable of maintaining the surface smoothness for a longer period of time can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an example of heating steam treatment on a wooden decorative board.

[Explanation of symbols]

1, 2 ... Hot platen, 4 ... Heater, 10 ... Pressure vessel main body, 11
... Lid, 12 ... Sealing packing material, 20 ... Wood base material

Claims (5)

[Claims] 1. A wooden decorative board, characterized in that a decorative sheet is attached to the surface of a wooden base material that has been subjected to dimensional stabilization treatment and, if necessary, surface polishing. 2. A method for producing a wood decorative board, which comprises applying a decorative sheet to a wood base material which has been subjected to a dimension stabilization treatment in advance, if necessary after surface polishing. 3. The wood base material is particle board, MD
3. An F, OSB or wafer board.
A method for producing a wooden decorative board as described above. 4. The method for producing a wooden decorative board according to claim 2, wherein the dimension stabilizing treatment is a treatment including a heating steam treatment on the wooden base material. 5. The method for producing a wooden decorative board according to claim 2, wherein the dimension stabilizing treatment is a treatment including a chemical treatment on the wooden base material.