JPH06108626A - Woody composite facing - Google Patents

Abstract

PURPOSE:To prevent the generation of warpage by sticking a surface facing onto a composite substrate by the laminating of plywood and an MDF board, forming a composite facing and shaping a large number of rear grooves to the rear of the MDF board. CONSTITUTION:Plywood 2 and an MDF board 3 are stuck and unified to form a composite substrate 1, and a surface facing 4 is pasted onto the top face of the MDF board 3 while a backing material 5 is stuck onto the underside of the plywood 2. A large number of rear grooves 6 are shaped in the longitudinal direction of the underside of the MDF board 3 while a large number of surface grooves 7 are formed in the longitudinal direction to the top face of the plywood 2 and cold-pressed and bonded. Accordingly, a surface has excellent flaw resistance, and the generation of bottom warpage can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood composite decorative material, more specifically, a surface decoration such as a decorative veneer on a substrate composed of a composite material of plywood and a medium fiber board (hereinafter abbreviated as "MDF board"). The present invention relates to a wood composite decorative material to which a wood material is attached and which is mainly used as a floor material.

[0002]

2. Description of the Related Art Conventionally, wooden decorative materials have a thickness of 5 to 15 mm.
In general, a plywood of a certain degree is used as a base material, and a thin decorative veneer such as wood veneer, printing paper and vinyl chloride sheet is attached and integrated on the surface thereof. In contrast to such a basic wooden decorative material, in recent years, a composite material obtained by laminating an MDF board on the above-mentioned plywood is used as a substrate, and the MD is made by adhering the decorative material to this.
A composite decorative material according to the F specification has appeared, and has received much attention.

This MDF specification decorative material is considered to be irreproducible in the tropics by reducing the amount of plywood made of tropical hardwood such as Lauan, especially as a part of protection of the global environment, which has been growing in recent years. It can contribute to the protection of rainforests and also has excellent surface scratch resistance as compared with that of plywood base material, that is, due to the high surface hardness of MDF board, drop impact especially in the application as floor material Scratches, drag scratches from heavy objects, heel mark scratches from the heel of the shoe,
It is expected to be used because of its usefulness such as making casters such as chairs less likely to be scratched by casters.

[0004]

However, on the other hand, this M
For DF specification wood decorative materials, composite plywood and M
Since the behavior of the DF plate against water is significantly different, harmful warpage, especially valley warpage with a lower central portion in the width direction, is likely to occur, which makes it difficult to maintain workability and flatness of the floor surface after construction. It is recognized to have the inherent problem of having. According to the investigation of the present inventors, the phenomenon of warpage of the decorative material using such a composite substrate is considered to be caused by the following behavior of each material due to the influence of moisture.

That is, as shown in FIG. 7A, plywood (1
1) MDF board (12) with water-based adhesive (15) on it
When the layers are stacked and cold-bonded, MD is generated due to the moisture in the adhesive.
The F plate (11) swells, and a ridge warp in the width direction having a convex surface side occurs as shown in FIG. After that, the MDF plate (12) gradually releases water as water vapor and shrinks accordingly, while the water reaching the plywood (11) and absorbed therein moves in the thickness direction of the plywood, As the plywood swells with a delay, the plywood is restored to a substantially flat state as a whole as shown in (c) of the figure, or it changes to a valley warp that becomes concave on the upper surface side of the MDF plate (12) and stabilizes. . However, the substrate (1) formed by laminating the plywood (11) and the MDF plate (12)
When the adhesive veneer (14) is applied to the upper surface side of 0) and the decorative veneer (13) is thermocompression-bonded, in addition to water in the adhesive,
Due to the influence of water in the decorative veneer (13), the hill warp tendency is once amplified as shown in FIG. 7 (d) immediately after the thermocompression bonding, but thereafter, with the progress of cooling, Due to the volatilization of water on the surface side, the shrinkage of the decorative veneer (13) and the MDF plate (12) has a greater effect, and as a result, the entire center is concave as shown in FIG. Causes a valley warp state. Furthermore, this decorative veneer (13)
In many cases, the required coating is performed on the surface of the above, but when the coating is performed, the above-mentioned valley warp tends to further increase with the curing, and is stabilized.

Such a warp of the decorative material, particularly in the widthwise direction, makes it difficult to join each other at the time of construction, and not only deteriorates the workability but also deteriorates the finished state of the floor surface, the wall surface and the like. Needless to say. It is well known that, from the viewpoints of workability and good finish, it is rather preferable that the decorative material as a whole has a slight tendency to warp.

It is an object of the present invention to eliminate the harmful warpage, particularly the valley warp tendency in the width direction, of the composite decorative material according to the above MDF specifications.

[0008]

In order to achieve the above object, the present invention makes use of the inherent surface hardness of an MDF plate, maintains the scratch resistance function, and reduces the dimensional change due to the water content, and The influence of the relative dimensional change in the vicinity of the bonding interface with the plywood on the other is reduced, and the occurrence of warpage is suppressed.

Further, by additionally using a means capable of counteracting the dimensional change of the MDF plate on the front surface side and the dimensional change of the plywood plate on the lower surface side, the effect of further improving the warp is further enhanced.

That is, the present invention provides a wood composite decorative material in which a surface decorative material is adhered to the upper surface of a composite substrate in which an intermediate fiber board is adhered to the upper surface of a plywood, and the lower surface of the intermediate fiber board is The basic gist of the present invention is a wood-based composite decorative material characterized in that a large number of back grooves are formed along its length direction.

More preferably, a backing material made of a tensile thin material is attached to the lower surface of the plywood.
Alternatively, a plurality of front grooves are formed on the upper surface of the plywood along the length direction thereof. More preferably, both of the above means are used together.

The structure of the present invention will be described below with reference to the accompanying drawings.

1 and 2 showing the best mode of the present invention, a composite decorative material (A) comprises a plywood (2) and a composite substrate (3) which is attached and integrated on the upper surface thereof. 1) is formed, and the surface decorative material (4) is attached to the upper surface thereof, that is, the upper surface of the MDF plate (3), and the backing material (5) made of a tensile thin material is attached to the lower surface on the plywood (2) side. ) Is attached. A large number of back grooves (6) are formed on the lower surface of the MDF plate (3) in the longitudinal direction, and a large number of front grooves are also formed on the upper surface of the plywood (2) in the longitudinal direction. (7) is formed.

The plywood (2) is generally formed by laminating 3 to 7 plies of wood veneer made of hardwood such as lauan wood. In addition to lauan wood, softwood such as rice pine is also used. It is also possible to use the following materials or those obtained by mixing and laminating them. The thickness is not particularly limited and may be appropriately determined depending on the application, but usually 2.
Those having a range of 5 to 15.0 mm are used. Particularly, the one having a diameter of 2.5 to 12.0 mm is generally used.

The MDF board (3) uses a hardwood, a softwood or a mixture thereof as its wood fiber material, and a urea resin, a melamine resin or a phenol resin as a binder resin. For the purpose of modification, a mixture of organic fibers and inorganic fibers other than wood fibers may be used, or wood fibers chemically treated such as acetylation treatment and grafting treatment may be used. MD
The thickness of the F plate is also not particularly limited. Usually in the range of 1.0 mm to 15 mm, generally 2.0 to
The thing of about 9.0 mm is used. The relative relationship with the thickness of the plywood (2) is not particularly limited, either.
It can be appropriately determined according to the application, but in general, in plywood thickness (T ₁ ) / MDF plate thickness (T ₂ ), T ₁ / T ₂
= 2 to 4 or so. Of course, depending on the application, T ₁ / T ₂ <2, T ₁ / T ₂ > 4 may be set.

As the surface decorative material (4), a wood decorative veneer is often used in the application as a floor material, but vinyl chloride sheets, printing paper, resin-impregnated paper, etc. are used in the wall material and other applications. It may be done. As the wood-made decorative veneer, one having a thickness of 0.1 to 3.0 mm, preferably about 0.2 to 0.6 mm, which is made of any tree species such as oak, cherry, duck, maple, hippo, and cypress is used. . It is suitable to use it in a wet state in the case of a thin material having a thickness of about 0.2 mm, and to dry it in the case of a relatively thick material of about 0.6 mm.

The backing material (5) restricts the dimensional change due to its expansion and contraction, especially its swelling, on the back surface side of the plywood (1), and consequently exerts a restriction action against the dimensional change due to the contraction of the MDF board (3). Is. Therefore, it is desirable that the tensile strength in the direction corresponding to the width direction of the plywood (2) when it is attached to the back surface of the plywood (2) is 10 kgf / 15 mm width or more. The material is not particularly limited. Generally, paper, non-woven fabric, or woven fabric is used, but resin-impregnated paper, metal thin plate, synthetic resin film or sheet, wood veneer, or the like may be used.

The back groove (6) of the MDF plate (3) is a main component of the present invention. The back groove (6) needs to be provided along the length direction of the decorative plate (A), that is, in the direction orthogonal to the width direction, but the cross-sectional shape of the groove is that of a general rectangular groove. In addition, V-shaped groove, U-shaped groove and the like are optional. Further, it is not necessarily required to be continuous in a straight line, and it may be formed in a meandering shape, a wavy shape, etc., or may be formed in an intermittent shape. Furthermore, a continuous groove and an intermittent groove are mixed. It may be allowed to.

The groove width, groove depth, groove area ratio of the back groove (6),
The groove pitch and the like are not particularly limited, but are preferably set as follows.

First, as for the groove width, it is effective to use a notch having almost no width because the corresponding effect can be obtained, but it is preferable to set the width to 0.5 to 5 mm.
Regarding the groove depth, in relation to the thickness of the MDF plate (3), it is in the range of 1/5 to 1/2, particularly preferably 1/4.
It is preferable to set in the range of about 1/3. Further, the groove area ratio refers to the ratio of the opening area of the groove to the surface area of the MDF plate, and the range of 5 to 50% is a proper range, and the range of 5 to 30% is particularly preferable. Furthermore, the groove pitch is appropriately set in relation to the groove width and the groove area ratio, but is 3 to 30 mm, especially 5
It is general and preferable to set the pitch to about 15 mm.

If the groove width is too narrow, the groove depth is too shallow, or the groove area ratio is too small, it is difficult to achieve the intended effect of the present invention to a sufficient extent, but If the groove width is too large, the groove depth is too deep, the groove area ratio is too large, or the groove pitch is too small, the strength of the MDF plate (3) is reduced, which is not preferable.

On the other hand, the front groove (7) of the plywood (2), which is an additional component of the present invention, effectively functions to improve warpage. It is necessary that the engraving direction of this front groove (7) is also in the longitudinal direction of the plywood (2).
Other groove shapes and the like are not limited in the same manner as the back groove (6) of the MDF plate (3).

Regarding the formation of the front groove (7), the plywood (2)
The design conditions should be considered so that the strength, especially the bending strength, is not significantly impaired. The groove width is 0.
The groove depth is about 5 to 5 mm, and the groove depth is 1 / the thickness of the plywood (2).
6 to 1/2, particularly preferably about 1/6 to 1/3, the groove area ratio is set to about 0.5 to 30% of the surface area of the plywood, and the groove pitch is set to about 30 to 150 mm. Target. When the groove width, the groove depth, and the area ratio are all too small and the pitch is too large, the desired effect cannot be sufficiently exhibited. When the groove width, the groove depth, the area ratio are too large, or the groove pitch is too small, the strength of the plywood (2) becomes insufficient, which may impair the function as a strength member. The adhesive strength with the MDF plate (3) may be insufficient.

In the production of the above wood composite decorative material (A), as shown in FIG. 3 (a), the upper surface of the plywood (2) is preliminarily subjected to predetermined groove processing to form the front groove (7). A predetermined back groove (6) is also formed on the lower surface of the MDF plate (3). Then, the backing material (5) is bonded and integrated to the back surface of the plywood (2), and then MD is applied to the upper surface of the plywood (2) with the adhesive (8).
The F board (3) is attached and integrated to produce the composite substrate (1). Lamination of this plywood (2) and MDF board (3)
Generally, it is performed by cold pressure bonding. Immediately after this bonding, the substrate (1) as a whole shows a slight mountain warp tendency as shown in FIG.
As the water vaporizes from the plate (3), it is restored to a substantially flat state and stabilized as shown in FIG. Therefore, next, the decorative material (4) is superposed on the upper surface of the substrate (1) via the adhesive (9), and thermocompression bonded and integrated to obtain the desired decorative material (A).
To complete.

However, the order of laminating each material is not necessarily limited to the above. For example, the front surface decorative material (4) and the back surface backing material (5) may be bonded at the same time.

FIGS. 4 to 5 show another example of the structure of the decorative material according to the present invention.

The decorative material (A ₁ ) shown in FIG. 4 is basically the same as the present invention in which the back groove (6) is formed in the MDF plate (3) and the front groove (7) of the plywood (2). 2) and the backing material (5) is not attached. Even in the case of this configuration example, due to the action of the back groove (6) of the MDF plate (3), especially when the thickness of the plywood (2) is large, a valley warp in the width direction does not occur in the whole. You can

The decorative material (A ₂ ) shown in FIG. 5 is a plywood (2).
The formation of the front groove (7) is omitted. In this case, as compared with the configuration example of FIG. 4, the effect of preventing warpage can be further improved.

The decorative material (A ₃ ) shown in FIG. 6 is obtained by omitting the use of the backing material (5) and forming the front groove (7) on the plywood (2) instead. Also in this case, as compared with the configuration example shown in FIG. 4, a relatively excellent effect of improving the warp can be realized.

[0030]

According to the present invention, since the MDF plate (3) is used on the upper surface side of the composite substrate, it has excellent scratch resistance depending on its own surface hardness. Of course, since the back surface of the MDF plate (3) is formed with a large number of back grooves (6) along the length direction, harmful warpage, especially valley warpage in the width direction is caused. It is possible to provide a decorative material having good workability and finish. The reason is as follows.
That is, when the plywood (2) and the MDF plate (3) are bonded, the area in which the MDF plate (3) contacts the adhesive (8) is reduced by the formation of the back groove (6). Therefore,
This is because the amount of water absorbed from the adhesive of the MDF plate (3) is reduced, and part of the water is released from the back groove (6) as water vapor during the water absorption process. Thus, the swelling deformation of the MDF plate (3) can be suppressed small.
In addition, after the above-mentioned bonding, even if the MDF plate (3) contracts due to the release of the absorbed water, the influence thereof is exerted on the plywood (2) side because of the adhesion area due to the formation of the back groove (6). It will be reduced by the decrease. That is, the back groove (6) has a relaxing effect on the relative expansion and contraction effect of the plywood (2) and the MDF board (3),
It is possible to prevent a large warp phenomenon from occurring in the entire substrate (1) including the plywood (2). This action has the same effect not only during the laminating step of the surface decorative material but also as a phenomenon associated with moisture absorption and release after production, and as a result, does not have harmful warpage and does not cause warpage. It is possible to provide materials.

The backing material (5) according to claim 2
When used together, the MDF plate (3) exerts a regulating action against the tendency that the whole substrate (1) tends to warp due to the contraction of the MDF plate (3), and at the same time, the extension deformation of the plywood (2) due to moisture swelling. On the other hand, the lower surface side also has a regulation effect,
It is possible to effectively prevent the occurrence of valley warp in the decorative material. Further, as in claim 3, by forming the front groove (7) on the upper surface of the plywood (2), the substantial adhesion area between the plywood (2) and the MDF board (3) is further reduced, and the mutual adhesion area is reduced. The effect of reducing the relative expansion and contraction deformation of MDF can be increased, and the amount of water movement from the MDF plate (3) side to the plywood (2) can be reduced,
In addition, it promotes the external release of water from the surface groove (7) to reduce the amount of swelling deformation of the plywood, which in turn causes the warpage of the decorative material,
In particular, it contributes to the prevention of valley warpage.

Therefore, by using the backing material and the front groove of the plywood together as in the fourth aspect, it is possible to realize both of the above effects, and to provide a cosmetic material with no significant warpage.

[0033]

EXAMPLES As shown in Table 1, the thicknesses of plywood, MDF board, and surface decorative material were changed variously, and the design conditions of the back groove of the MDF board and the front groove of plywood were also changed variously. Manufactured various wood-based composite decorative boards by changing the presence or absence of the backing material and the material. In this manufacturing process, basically, a MDF plate having a back groove formed in advance is adhered by cold pressure bonding to a plywood plate having a front groove formed in advance and a backing material is adhered thereto to produce a composite substrate. The surface decorative material is pasted and integrated on the composite substrate by thermocompression bonding, then the surface of the surface decorative material is colored, and the abrasion-resistant paint mainly composed of polyurethane resin is applied and dried to complete the product. To get. As for the plywood, lauan plywood was used for all of the plies having a thickness of 5 mm, and for all the other plies of 5 plies. As the surface decorative material, oak veneer was commonly used.

And, regarding the above-mentioned various kinds of composite decorative materials,
Measure the warpage of the finished product immediately after manufacturing the composite substrate during the manufacturing process, that is, immediately after removing it from the cold press, in the stabilized condition after applying the surface decorative material, and for each finished product. did. The results are also shown in Table 1.

[0035]

[Table 1]

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a structural example of a wood composite decorative material according to the present invention as a best mode.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an explanatory view showing a manufacturing process of the composite decorative material of FIG. 1.

FIG. 4 is a cross-sectional view showing another configuration example of the wooden composite decorative material according to the present invention.

FIG. 5 is a cross-sectional view showing still another configuration example.

FIG. 6 is a sectional view showing still another configuration example.

FIG. 7 is an explanatory view showing a manufacturing process of a conventional wood-based composite decorative material.

[Explanation of symbols]

 (A) ... Wooden composite decorative material (1) ... Composite substrate (2) ... Plywood (3) ... MDF board (4) ... Surface decorative material (5) ... Backing material (6) ... Back groove (7) ... Front groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Moribun July 1-3-17, Nishi, Izumisano-shi, Osaka

Claims (4)

[Claims] 1. A wood composite decorative material having a surface decorative material adhered to an upper surface of a composite substrate having a medium fiberboard adhered to an upper surface of a plywood, the length of which is provided on a lower surface of the intermediate fiber board. A wood composite decorative material characterized in that a large number of back grooves are formed along the direction. 2. The wood composite decorative material according to claim 1, wherein a backing material made of a tensile-resistant thin material is attached to the lower surface of the plywood. 3. The wood composite decorative material according to claim 1, wherein a large number of front grooves are formed on the upper surface of the plywood along the length direction thereof. 4. A backing material made of a tensile-resistant thin material is attached to the lower surface of the plywood, and a large number of front grooves are formed on the upper surface of the plywood along the length direction thereof. Claim 1
The wood-based composite decorative material described in 1.