JP3411776B2 - Method for smoothing surface of oriented strand board and decorative board having oriented strand board as base material - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a surface smoothing method for oriented strand board and a decorative board having the oriented strand board as a base material. The "oriented strand board" is a wood board called OSB (Oriented strand board), and is usually 2 cm x 10 cm to 3 cm x.
It is formed by accumulating wide wood strands having a length of about 13 cm.

[0002]

2. Description of the Related Art Fiberboards and particleboards are formed by accumulating wood chips and wood fibers having a size of 0.5 mm × 2 mm × 30 mm or less, so that the surface is relatively flat, and coating of a sealing agent or The surface can be easily smoothed by polishing, and even if a decorative layer such as a thin veneer is directly formed on the surface, the surface smoothness of the decorative layer is not impaired. Therefore, at present, fiber boards and particle boards are widely used as base materials for wood decorative boards.

[0003] However, since the oriented strand board has a large strand of material and is long and wide, the surface is not flat and the surface property is very poor, and a thin veneer or a decorative sheet is directly applied to the surface as a decorative layer. When laminated and stuck, dangling of the strands and dents between the strands appear on the surface of the decorative layer, and a decorative board having good surface properties cannot be obtained. However, oriented strand board has higher strength than fiber board and particle board and is effective as a core material for decorative boards, so a material with good surface smoothness such as MDF is used on the surface. First, the surface layer is laminated, and then the surface is subjected to a normal smoothing means such as application of a sealing agent or polishing, and then a surface decorative layer such as a thin veneer or a decorative sheet is laminated and adhered to the decorative layer. And that is being done.

[0004]

As described above, while the decorative plate having the oriented strand board as the core material has advantages such as high strength, in order to obtain high surface smoothness, It is necessary to specially form a surface layer such as MDF with the surface decorative layer, and at present, a high cost is required for manufacturing a decorative plate having an oriented strand board as a core material.

Conventionally, several methods have been proposed as a method for smoothing the surface of wood materials such as plywood, fiber board, and particle board. For example, JP-A-50-70.
In Japanese Patent Publication No. 509 and Japanese Patent Publication No. 6-88375, a surface of a wood base material is coated with a sealing agent, dried, polished and smoothed, and then an adhesive agent is applied thereon to be dried. A method of forming a decorative layer by painting or the like after attaching paper to the paper is described.

The present inventor conducted an experiment in which the surface of the oriented strand board was subjected to the method of smoothing the surface of the above-mentioned plywood, fiber board, particle board, etc., but no good result was obtained. For example, when a sealing agent was applied to the surface of the oriented strand board for sealing, and an adhesive was applied and a veneer was attached, fine dents between the strands could be eliminated, but the adhesive and veneer Strands were seen to rise up due to moisture and heat during bonding, and duck appeared on the surface, impeding the smoothness of the veneer surface. In addition to surface irregularities due to duck, cracks were also observed. When the paper was adhered after the adhesive was applied and pre-dried and the veneer was adhered thereon, the generation of cracks was prevented to some extent, but surface irregularities due to dents still remained.

Through such an experiment, the present inventor
We have experienced that the conventional method of smoothing the surface of plywood, fiberboard, particle board, etc., cannot be applied to the surface smoothing of oriented strand board as it is, and the sufficient effect cannot be obtained.

Therefore, an object of the present invention is to provide a novel method for smoothing the surface of an oriented strand board, and a decorative board having an oriented strand board whose surface is smoothed as a base material. To provide.

[0009]

The method for smoothing the surface of an oriented strand board according to the present invention which solves the above-mentioned problems is basically the step of applying a sealing agent to the surface of the oriented strand board, and the surface thereof. The step of applying an adhesive to the
Place the paper with the applied adhesive undried or semi-dry,
The method is characterized by including a step of sticking paper to the surface of the oriented strand board by heat and pressure, and a step of polishing the surface side of the stuck paper.

The oriented strand board whose surface is to be smoothed may itself form a base material such as a decorative board, and is a thin plate-like laminated on the surface of a base material such as plywood. It may be one. First, as a preliminary process,
The surface is ground with a wide belt sander or the like to seal the dents formed at the intersections of the strands.

The filling agent is not particularly limited as long as it is a material capable of filling the recess, and an acrylic emulsion,
Synthetic resin emulsion such as vinyl acetate emulsion, copolymer emulsion, special emulsion such as special acrylic emulsion, powder putty such as abrasive powder, urethane, water-based vinyl urethane, polyisocyanate, U
V (ultraviolet curable resin) or the like may be used. The sealing agent may be applied by a method of filling only the indented portion with a knife coater, a bottom coater, a reverse roll coater or the like.

An adhesive such as an epoxy resin is preferably applied after applying a sealing agent and drying it with a drier or the like, or without drying. Preferably, a special spatula is used so that the dented portion is further blocked. The coating thickness is not particularly limited, but is usually about 3 to 6 g / scale ² . If it is less than 2 g / square ² , the dent portion may not be sufficiently filled, and if it is 10 g / square ² or more, a thick film may be formed on the surface and a puncture may occur during paper sticking.

Paper is applied in a state where the applied adhesive is undried or semi-conveyed, that is, in a state where moisture remains in the adhesive, preferably in a state where the adhesive has a high water content. The paper to be pasted is not particularly limited as long as the inter-paper strength is not too weak, coated printing paper, non-coated printing paper, unbleached packaging paper, etc. in general, and corrugated cardboard, white paperboard, All paperboards such as

After laminating the paper on the applied adhesive, pressure bonding is carried out by an ordinary hot press. Shortly after the hot press is released, the strands rise up, duck occurs, and the surface becomes uneven. It is understood that the rising of the strands is due to the fact that the moisture contained in the adhesive penetrates into the strands of the surface portion and is heated to release the internal stress generated in the strands of the oriented strand board.

In order to smooth the unevenness due to the generated duck, the duck is scraped off from the pasted paper again by using a wide belt sander or the like. This polishing may be performed by scraping off part or all of the attached paper. By polishing in this manner, a surface-smoothed oriented strand board is obtained, and the obtained oriented strand board has the internal stress of the strand located near the surface released, and the surface decorative layer after the fact. The formation process of (1) does not cause duck again.

In the decorative board having the oriented strand board as a base material according to the present invention, a surface decorative layer is formed by a usual method on the surface of the oriented strand board whose surface is smoothed as described above. The surface decorative layer is formed by attaching a veneer or a resin sheet or film, an appropriate coating film,
And so on. According to an experiment by the present inventor, modified styrene
Even if a conventionally used adhesive such as a butadiene copolymer latex is applied and a veneer having a thickness of about 0.1 to 0.3 mm is stuck, no duck is generated after the veneer is stuck, and there is no unevenness. A decorative plate with a smooth surface could be obtained. Further, when polishing is performed so that a paper material is left between the surface of the oriented strand board and the veneer, the remaining paper may also function as a cushioning material, so that cracks may occur on the surface of the veneer. Can be suppressed.

[0017]

EXAMPLES The present invention will be described below with reference to examples. [Example 1] Using a sand coater for oriented strand board, a sealing agent (manufactured by Union Paint Co., Ltd.) containing a special acrylic emulsion as a main component was used for sealing with a knife coater. The coating amount was 4g / scale ^2. After stopping
The drying step was omitted, and a urea / vinyl acetate-based adhesive (manufactured by Oshika Shinko Co., Ltd.) was applied to the surface at a coating amount of 10 g / scale ² using a roll coater. Next, the heating plate temperature 110
At 250 ° C. and a press time of 30 seconds, a paper was applied using 250 g / m ² of resin-impregnated paper. Cool after pressing #
After applying a sander with a 180 wide belt sander, a modified styrene / butadiene copolymer latex (manufactured by Oshika Shinko Co., Ltd.) was applied at an application amount of 10 g / scale ² , and then a thickness of 0.
A 3 mm veneer veneer was attached.

[Example 2] An oriented strand board having a sander applied thereto was sealed with a knife coater using a sealing agent (manufactured by Union Paint Co.) whose main component was a synthetic resin emulsion. The coating amount was 6 g / scale ² . After the filling, it was put in a wicket dryer at a temperature of 60 ° C. for 2 minutes to be dried. Next, a water-based epoxy adhesive (manufactured by Konishi Co., Ltd.) was applied to the surface using a special spatula to give an application amount of 12 g /
It was applied as a scale ² . Next, the hot plate temperature was 120 ° C., and the press time was 50 seconds, and the paper was pasted using 60 g / m ² of uncoated printing paper. After cooling after pressing, sanding was performed with a # 180 wide belt sander, and a veneer was attached in the same manner as in Example 1 above, and the surface was further coated.

Comparative Example 1 The oriented strand board was sealed in the same manner as in Example 1 above. Next, in order to dry the filling material, it was put into a dryer at a temperature of 50 ° C. for about 20 minutes. After the completion of drying, an adhesive was applied in the same manner as in Example 1 above, and a veneer was directly attached onto the adhesive.

The products of Examples 1 and 2 and the product of Comparative Example 1 were evaluated as follows. The results are shown in Table 1. Visual evaluation of duck and dents on the surface of the veneer surface or coated surface. The case where it could not be visually inspected was marked with O, and the case where one or more could be visually observed was marked with X.

Plane Tensile Test It was conducted according to the JAS special plywood test. That is, a 2 cm square chuck was attached to the center of the surface of a square test piece having one side of 5 cm via an adhesive, and the tensile force was measured (average value per 10 pieces).

Cold Repeated B Test It was carried out according to the JAS special plywood test. That is, 80 ° C
Two cycles of 2 hours during the constant temperature and then 2 hours during the constant temperature of −20 ° C. were repeated twice to make one cycle, and 2.5 cycles were performed.
After that, visually check for cracks, wrinkles, discoloration, and thinning of the surface.
△ when the number of cracks is within this number, and when there are 10 or more cracks of 1 cm or more or cracks within 1 cm, x),
Further, the number of cracks was counted.

[0023]

[Table 1]

[Evaluation] As shown in Table 1, by sealing, the dents formed at the intersections of the strands of the oriented strand board were eliminated, and by polishing after the paper was attached, the strands after the veneer was attached were removed. Duck has disappeared and the surface smoothness has been greatly improved. In addition, the occurrence of cracks has been drastically reduced by sticking paper.

[0025]

According to the present invention, it is possible to obtain a decorative board having a smooth surface even if a surface material such as a veneer is laminated on the surface of the oriented strand board, which has strong strength and good surface property. It is possible to obtain various decorative boards at low cost.

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tatsufumi Miyata 2-10-60 Hirabayashi Minami, Suminoe-ku, Osaka-shi, Osaka, Eidai Sangyo Co., Ltd. (56) Reference JP-A-2-307705 (JP, A) ) JP-A-8-72022 (JP, A) JP-A-50-70509 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04C 2/00 -2/54 B27M 3 / 00 B32B 21/08

Claims (8)

(57) [Claims] 1. A step of applying a sealing agent to the surface of the oriented strand board, a step of applying an adhesive to the surface,
Place the paper with the applied adhesive undried or semi-dry,
A method of smoothing the surface of an oriented strand board, comprising: a step of sticking paper to the surface of the oriented strand board by heat and pressure; and a step of polishing the surface side of the stuck paper. 2. A part or all of the adhered paper is removed from the surface of the oriented strand board by the step of polishing the surface side of the adhered paper.
A method for smoothing the surface of an oriented strand board as described above. 3. An adhesive is applied to the surface of the surface-polished oriented strand board, and the adhesive is applied in a dry or undried state, and the applied adhesive is undried or semi-dried. Oriented strand board characterized by arranging paper in a dry state, pasting the paper on the surface of the oriented strand board by heat and pressure, and then scraping off the rising part due to expansion of the strand generated in the process by polishing Surface smoothing method. 4. The orientation according to claim 3, wherein part or all of the paper stuck to the surface of the oriented strand board is also removed in the step of scraping off the rising portion due to the expansion of the strand by polishing. Smoothing method for flexible strand board. 5. A makeup comprising at least an oriented strand board whose surface is smoothed by the surface smoothing method according to claim 1, and a surface decorative layer laminated on the surface. Board. 6. The contract in which the surface decorative layer is a veneer adhered to the surface.
The decorative sheet according to claim 5 . 7. The decorative board according to claim 5 , wherein the surface decorative layer is a resin sheet or a resin film attached. 8. The decorative board according to claim 5 , wherein the surface decorative layer is a coating film.