JP2006007713A - Wooden composite decorative plate and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wooden composite decorative plate for a flooring material which relaxes stress in a valley warp direction or in a mountain warp direction generated by extension and shrinkage during dry and moisture release or moistness absorbency of a veneer by making many fine cuts in a direction of fibers of the veneer, and which shows dimensional stability, hardly generates the valley warp of a lift of an edge portion of a flooring material and the mountain warp of a lift of its center portion by using a material capable of sufficiently suppressing the stress as a base material, and which can be used for a floor of a place equipped with a water supply, and to provide its manufacturing method. <P>SOLUTION: The wooden composite decorative plate for the flooring material is obtained by stacking a lining sheet of the veneer, DAP resin-impregnated paper or a wooden powder composite resin sheet, a synthetic rubber sheet, and the DAP resin-impregnated paper or the wooden powder composite resin sheet in this order from the upper side to integrate them into one body. Many fine cuts are made on the surface of the lining sheet of the veneer in the direction of the fiber of the veneer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is, for example, a flooring suitable for use as an indoor flooring to be laid on a floor foundation, for example, at the time of new construction or renovation of a general house or a store, particularly as a flooring around a water floor. The present invention relates to a wood composite decorative board and a method for producing the same.

Conventionally, the flooring material has been bonded on the floor base by using an adhesive. However, in recent years, the adhesive is used for the purpose of shortening the construction period and facilitating replacement of the flooring during renovation. There is a tendency to use a flooring material that is placed on the floor substrate with a double-sided tape or the like without using the floor.
As such a flooring material, for example, a laminate in which a protruding plate is laminated on an upper surface of a base material in which a high-density flexible sheet is laminated on a lower surface of a substrate such as a plywood is known (for example, Patent Document 1). reference).
When the flooring material as described above is bonded to the floor substrate using double-sided tape, the veneer and the substrate are made of wood, so the veneer and the substrate shrink or expand due to dry moisture or wet moisture absorption. The stress in the direction of warp or the direction of warp generated by the high-density soft sheet cannot be sufficiently suppressed, and the warp that rises at the end of the entire flooring and the warp that rises at the center There was a problem that occurred.

  As a flooring that has been devised to prevent the occurrence of such warping, for example, on a base material in which a thin sheet of wood with a large number of cuts and a flexible resin sheet are laminated in order from the top, the fiber direction There is one in which projecting plates are laminated so as to be orthogonal (see, for example, Patent Document 2).

  This flooring is made by providing a large number of cuts in the wood sheet, and mitigating the stress in the direction of valley warp or mountain warp caused by the expansion and contraction of the wood sheet during dry moisture release or wet absorption. This suppresses the generation of valley warpage. However, it cannot be said that such a flooring material has also sufficiently relaxed the stress in the valley warp direction or the stress in the mountain warp generated with the drying shrinkage or wet expansion of the veneer and the wood thin plate.

  Moreover, as a flooring other than the above, for example, a wood fiber board having a specific gravity of 0.7 or more and a thickness of 2.0 mm or less, a specific gravity of 1.5 to 3.0, and a thickness three times or more that of the wood fiber board. There is also a laminate in which a protruding plate is laminated on a base material in which specific gravity sheets are laminated in order from above (for example, see Patent Document 3).

This flooring material has little change in expansion and contraction due to moisture absorption and desorption as a base material, and occurs with the expansion and contraction behavior of the wood fiber board by using a high specific gravity sheet and a thin wood fiber board that are thicker than the wood fiber board. The stress of the valley warp direction or the hill warp is suppressed, and the valley warp or the hill warp is hardly generated as the entire flooring material.
However, in this flooring, the wood fiber board has low water resistance and moisture resistance, expands due to moisture absorption, and when further expanded, it is difficult to return to its original shape even when dried. When the flooring used is used on a floor around water such as a kitchen or a washroom, the high specific gravity sheet suppresses the stress in the direction of warping caused by hygroscopic expansion (dimensional change) of the veneer and wood fiberboard. However, there was a problem that the floor material as a whole was liable to be warped and cracked.
No. 6-33099 Japanese Patent No. 2793305 JP 2003-300203 A

  The present invention has been made in consideration of such conventional circumstances, and the problem is that the veneer is dried and dehumidified by forming a large number of thin cuts substantially along the fiber direction of the veneer. Or, there is dimensional stability by using a material that can sufficiently reduce the stress of the valley warp direction or the stress of the warp generated along with expansion and contraction during wet absorption, and can sufficiently suppress the stress as a base material, Further, it is an object of the present invention to provide a wood composite decorative board for flooring which can hardly be used for a floor around water and is difficult to generate a valley warp in which an end portion of the flooring floats and a mountain warp in which a center part floats, and a method for manufacturing the same. And

  The present invention has been devised to solve the above-mentioned problems, and includes a veneer backing sheet, DAP resin-impregnated paper or wood powder composite resin sheet, synthetic rubbery sheet, and DAP resin-impregnated paper or wood powder composite. The resin sheet is laminated and bonded in this order from above, and is a wood composite decorative board. The surface of the veneer backing sheet is formed with a large number of thin notches extending substantially along the fiber direction of the veneer. The present invention relates to a wood composite decorative board for flooring.

  Further, the present invention is a projecting plate having a thickness of 0.4 to 0.8 mm, DAP resin-impregnated paper or wood powder composite resin sheet, synthetic rubber sheet, and DAP resin-impregnated paper or wood powder composite resin sheet from above. A wood composite decorative board that is laminated and bonded in this order and integrated, wherein the surface of the veneer is formed with a large number of thin notches extending substantially along the fiber direction of the veneer. The present invention relates to a wood composite decorative board for flooring.

In addition, the present invention includes a step of pasting a DAP resin-impregnated paper or a wood powder composite resin sheet on both upper and lower sides of a synthetic rubber sheet to make a laminated base material,
Forming a large number of thin cuts extending substantially along the fiber direction of the veneer on the surface of the veneer backing sheet;
The present invention relates to a method for producing a wood composite decorative board for flooring, comprising the steps of: stacking the veneer backing sheet on the laminated base material, and press-bonding to form a wood composite decorative board.

Furthermore, the present invention comprises a step of bonding a DAP resin-impregnated paper or a wood powder composite resin sheet on both upper and lower sides of a synthetic rubber sheet to make a laminated base material,
Forming a large number of thin cuts extending substantially along the fiber direction of the protruding plate on the surface of the protruding plate having a thickness of 0.4 to 0.8 mm;
The present invention relates to a method for producing a wood composite decorative board for flooring, characterized in that it comprises a step of superimposing the veneer on the laminated base material and press-bonding to form a wood composite decorative board.

The wood composite decorative board for flooring of the present invention,
The surface of the veneer backing sheet with large drying shrinkage or wet expansion or the surface of a thick veneer is provided with a large number of thin notches extending substantially along the fiber direction, so that the expansion and contraction of the veneer during dry or wet moisture absorption is achieved. Relieve the stress of the valley warp direction or mountain warp that occurs with, and
DAP resin-impregnated paper or wood powder composite resin sheet, synthetic rubber-like sheet, and DAP resin-impregnated paper or wood powder composite resin that have small expansion and contraction changes due to dry moisture absorption or wet moisture release as a substrate By using a laminate in which sheets are laminated in order from the top, the stress generated along with the dimensional change due to dry shrinkage or wet expansion of the veneer backing sheet or veneer disposed thereon is sufficiently suppressed.
By using the DAP resin impregnated paper or the wood powder composite resin sheet as the base material, the dimensional stability of the whole wood composite decorative board for flooring is maintained, and the valley warp and mountain warp are less likely to occur. Water resistance and moisture resistance are also improved, and it has the effect that it is also suitable for use on water floors such as kitchens and toilets.

Hereinafter, the present invention will be described more specifically with reference to the drawings.
FIG. 1 is a perspective view showing a wood composite decorative board 1 for flooring according to one embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line aa ′ of the wood composite decorative board 1 for flooring shown in FIG. FIG. 3 is a perspective view when the veneer backing sheet 2 of the wood composite decorative board 1 for flooring of the present invention is bent.
FIG. 4 is a cross-sectional view of the wood composite decorative board 10 for flooring according to another aspect of the present invention.

A wood composite decorative board 1 for flooring according to the present invention shown in FIG. 1 comprises a veneer backing sheet 2, a DAP resin impregnated paper 4, a synthetic rubber sheet 5, and a DAP resin impregnated paper as shown in the sectional view of FIG. 6 is laminated on a laminated base material 3 having a three-layer structure, laminated and adhered, and integrated.
Here, the veneer backing sheet 2 is obtained by laminating and bonding a fibrous backing material 8 on the back surface of the veneer 7.
As the veneer, any natural or artificial one can be used, but the one having a beautiful grain pattern is preferable from the viewpoint of design. As the projecting plate 7 for the projecting plate backing sheet 2, one having a thickness of 0.10 to 0.40 mm is used.
As the fiber backing material 8, a nonwoven fabric, paper, etc. are used, for example, those with a basis weight of 18 to 40 g / m ² are used.

  As an adhesive for bonding the protruding plate 7 and the fibrous backing material 8, an acrylic resin type is preferably used, but an epoxy resin type or a urethane resin type is also used.

Further, the veneer 7 on the surface of the veneer backing sheet 2 is formed with a large number of thin notches 9 extending substantially along the fiber direction, that is, the grain direction (see FIG. 3).
This notch 9 is normally not seen even when the veneer backing sheet 2 is viewed from above (the veneer side), and as shown in FIG. 3, it can be seen that it is formed when the veneer backing sheet 2 is bent. .
Therefore, the wood composite decorative board 1 for flooring according to the present invention does not lower the commercial value as the flooring due to the cuts 9.
Further, the length of each notch 9 is not particularly limited, but a large number of the notches 9 are formed at fine intervals on the entire surface of the veneer backing sheet 2 (the veneer plate 7), and the depth thereof is substantially equal to the thickness of the veneer plate 7. The depth is comparable.
Thus, by providing the notch 9 on the surface of the veneer backing sheet 2 having a large dry shrinkage or wet expansion, that is, the veneer 7, as described above, along with the expansion and contraction of the veneer during dry moisture release or wet moisture absorption. The generated warp direction or hill warp stress is alleviated, and the warp or hill warp hardly occurs in the wood composite decorative board 1 for flooring.

As the DAP resin impregnated papers 4 and 6 that are laminated and bonded to the upper and lower sides of the synthetic rubber sheet 5, those having a thickness of about 0.4 to 0.6 mm are used.
Moreover, instead of the DAP resin impregnated papers 4 and 6, a wood resin composite resin sheet in which polyolefin resin, for example, polypropylene resin and wood powder are mixed in a ratio of 7: 3 to 3: 7 can be used. A wood powder composite resin sheet having a thickness of 0.4 to 1.0 mm is suitable.

  As the synthetic rubber sheet 5, a synthetic rubber such as chloroprene rubber or ethylene propylene rubber molded into a sheet shape is used, and a thickness of 1.9 to 4.0 mm is used. .

As an adhesive for bonding the two DAP resin impregnated papers 4 and 6 laminated on the upper and lower sides of the synthetic rubber sheet 5, an epoxy resin type is preferably used, but an acrylic resin type or a urethane resin type is used. There are no particular limitations on the adhesive and the like.

  Thus, the DAP resin-impregnated paper 4 or the wood powder composite resin sheet, the synthetic rubber-like sheet 5, and the laminated base material 3 in which the DAP resin-impregnated paper 6 or the wood powder composite resin sheet are laminated in order from the top are dry moisture absorption Or since the expansion and contraction change due to wet moisture release is small, it is possible to suppress the stress generated with the drying shrinkage or wet expansion of the veneer backing sheet 2 disposed thereon, and as a whole the wood composite decorative board 1 for flooring Dimensional stability is maintained, and the occurrence of valley warping and mountain warping is suppressed.

  The adhesive for adhering the veneer backing sheet 2 and the DAP resin impregnated paper 4 on the upper surface of the laminated base material 3 is preferably a hot melt adhesive, acrylic resin, epoxy resin, urethane resin, etc. There is no limitation.

The wood composite decorative board 1 for flooring according to the present invention can use a thick veneer 11 instead of the veneer backing sheet 2.
When a thick veneer is used, as shown in the cross-sectional view of FIG. 4, the wood composite decorative board 10 for flooring includes a thick veneer 11, DAP resin impregnated paper 12, synthetic rubber sheet 13, DAP resin impregnated paper. The laminated base material 15 consisting of 14 is laminated in order from the top.
As the thick protruding plate 11, one having a thickness of 0.4 to 0.8 mm is used. Similar to the surface of the veneer backing sheet 2 on the surface of the thick veneer 11, in order to relieve the stress of the valley warp direction or the mountain warp that occurs due to expansion / contraction (size change) during dry moisture release or wet moisture absorption. The notch 16 is provided, and the depth of the notch 16 is set to such a depth that the protruding plate is not finely divided by the notch 16.

When the wood composite decorative board 1 of the present invention is composed of a veneer backing sheet 2 and a laminated base material 3 comprising a DAP resin impregnated paper 4, a synthetic rubber sheet 5, and a DAP resin impregnated paper 6,
First, an adhesive is applied to the upper and lower surfaces of the synthetic rubber sheet 5, and the laminated base material 3 is made by laminating and bonding the DAP-impregnated resin papers 4 and 6 to both surfaces.
On the other hand, by applying an adhesive to the veneer 7 and pressure-sensitively adhering to the fiber backing material 8, the veneer backing sheet 2 is removed while removing excess moisture from the warp plate 7 and the fiber backing material 8. Make,
Next, the surface of the veneer backing sheet 2, that is, the veneer 7 is cut with a cutter along the fiber direction, or the veneer backing sheet 2 is bent along the fiber direction with a roller or the like to form a crack. The notch 9 is formed by
Thereafter, an adhesive is applied to one DAP-impregnated resin paper 4 of the laminated base material 3, and the veneer backing sheet 2 is laminated thereon with the fiber backing material 8 as the lower surface, and is pressed and bonded. The

Moreover, when the thick veneer 11 is used instead of the veneer backing sheet 2, the wood composite decorative board 10 of the present invention is
First, an adhesive is applied to the upper and lower surfaces of the synthetic rubber sheet 13, and the laminated base material 15 is made by laminating and bonding the DAP-impregnated resin papers 12 and 14 to both surfaces,
On the other hand, the notch 16 is cut into the protruding plate 11 to such an extent that the protruding plate 11 is not finely divided by cutting the cutting plate 16 with a cutter along the fiber direction or by bending the protruding plate along the fiber direction with a roller or the like. Form
Thereafter, an adhesive is applied to one DAP-impregnated resin paper 12 of the laminated base material 15, and the protruding plate 11 is laminated on the surface on which the cuts 16 are formed as an upper surface, and is pressed and bonded. .

When it is desired to further give gloss, scratch resistance, water resistance, etc. to the manufactured wood composite decorative board 1 (10), a coating material appropriately selected on the surface of the veneer backing sheet 2 or the thicker veneer 11, for example, UV paint, polyurethane resin paint or the like may be applied.

Example 1: Wood composite decorative board using a veneer backing sheet A wood composite decorative board for flooring is a paper fiber backing with a basis weight of 18 g / m ^{2 on} the bottom surface of a 0.25 mm thick veneer. The material was laminated and bonded via an acrylic adhesive to create a veneer backing sheet, and the veneer backing sheet was curved along the fiber direction with a roller to form a cut.
Next, a DAP resin impregnated paper having a thickness of 0.5 mm, a synthetic rubber sheet having a thickness of 2 mm made of ethylene propylene rubber, and a DAP resin impregnated paper having a thickness of 0.5 mm are arranged in this order via an epoxy adhesive. A laminated base material was prepared by laminating, and the veneer backing sheet was laminated thereon via an aqueous polymer-isocyanate adhesive to produce an integrated wood composite decorative board for flooring.

Example 2: Wood composite decorative board using a thick veneer The wood composite decorative board for flooring was formed by cutting a white oak-thick 0.5 mm thick veneer along the fiber direction with a roller. .
Next, a 0.5 mm thick DAP resin impregnated paper, a 2 mm thick synthetic rubber sheet made of ethylene propylene rubber processed into a sheet shape, and a 0.5 mm thick DAP resin impregnated paper in this order are epoxy. A laminated base material is formed by laminating and bonding via a base adhesive, and the veneer backing sheet is laminated and integrated on the veneer backing sheet via an aqueous polymer-isocyanate adhesive. It was created.

一般に谷反りの発生が小さくなるであろうと考えられる、厚さ４ｍｍの合板を基材として使用した床材用化粧板（比較試料２）でさえ、端部が０．５ｍｍ浮き上がる谷反りを発
生したのに対し、ＤＡＰ樹脂含浸紙、合成ゴム質シート、及び、ＤＡＰ樹脂含浸紙を貼合せた積層体を基材として使用した床材用化粧板（比較試料１）は、基材の厚さが比較試料２よりも薄い３ｍｍなのに、端部が０．３ｍｍ浮き上がる谷反りしか発生しなかった。
更に、基材として、ＤＡＰ樹脂含浸紙、合成ゴム質シート、及び、ＤＡＰ樹脂含浸紙の積層体を用い、かつ突板裏打ちシートの表面に切り込みを設けることにより得られる本発明の床材用木質複合化粧板においては、谷反りが全く発生しなくなった。
以上の結果より、基材として、ＤＡＰ樹脂含浸紙、合成ゴム質シート、及び、ＤＡＰ樹脂含浸紙を貼合せた積層体を使用し、かつ、突板裏打ちシートの表面に、切り込みを設けるという構成を採ることにより、本発明の床材用木質複合化粧板は、その端部が浮き上がる谷反りの発生を抑制することができるという効果を奏することが確認される。 Comparative test 1
Occurrence of valley warp of the wood composite decorative board for flooring during drying by using as a base material a laminate obtained by laminating DAP resin-impregnated paper, synthetic rubber sheet, and DAP resin-impregnated paper in order from the top The following comparative test was conducted in order to evaluate the occurrence of valley warp of the wood composite decorative board for flooring during drying, with or without cutting on the surface of the veneer backing sheet.
As a test body, a wood composite decorative board for flooring of Example 1 processed to a size of 150 mm × 150 mm was used as a sample of the present invention. On the back surface (DAP resin impregnated paper) of the sample of the present invention, a double-sided tape having a width of 15 mm was attached along the fiber direction of the protruding plate. As shown in FIG. After fixing on the plywood 18 and then allowing the sample of the present invention to stand for 24 hours in a thermostat kept at 60 ° C., the warpage of the wood composite decorative board for flooring of Example 1 at the time of drying. The degree was evaluated.
Moreover, as a test body, the wooden composite decorative board for flooring (comparative sample 1) similar to Example 1 except that the notch is not formed on the surface of the veneer backing sheet, and the cross section is shown in FIG. The floor warp wood composite decorative board 22 (Comparative Sample 2) obtained by laminating and bonding a veneer backing sheet 21 similar to that of Comparative Sample 1 on a base material 20 made of plywood having a thickness of 4 mm is similarly subjected to warping. The degree was evaluated.
The obtained results are shown in Table 1.

Even in the decorative board for flooring (Comparative Sample 2) using a plywood with a thickness of 4 mm as a base material, where it is considered that the generation of the valley warp will be reduced in general, a valley warp in which the edge part is lifted by 0.5 mm occurred. On the other hand, the decorative sheet for flooring (comparative sample 1) using a laminate of DAP resin-impregnated paper, synthetic rubber sheet, and DAP resin-impregnated paper as a substrate has a thickness of the substrate. Although it was 3 mm thinner than the comparative sample 2, only the valley warp in which the end part floated 0.3 mm occurred.
Furthermore, the wood composite for flooring of the present invention obtained by using a laminate of DAP resin-impregnated paper, synthetic rubber-like sheet, and DAP resin-impregnated paper as the base material and providing a notch on the surface of the veneer backing sheet In the decorative board, no valley warp occurred.
From the above results, a structure in which a laminate in which DAP resin-impregnated paper, synthetic rubber-like sheet, and DAP resin-impregnated paper are bonded as a base material is used, and a notch is provided on the surface of the veneer backing sheet. By adopting, it is confirmed that the wood composite decorative board for flooring according to the present invention has an effect of suppressing the occurrence of valley warp in which the end portion is lifted.

寸法安定改善効果は、[１−（突板裏打ちシートの表面に切込み処理がある試料の寸法変化率）／（突板裏打ちシートの表面に切込み処理がない試料の寸法変化率）]×１００により算出した。
また、反り減少効果は、[１−（突板裏打ちシートの表面に切込み処理がある試料の反り）／（突板裏打ちシートの表面に切込み処理がない試料の反り）]×１００により算出した。

突板裏打ちシートの表面に切り込みを設けることによって、床材用木質複合化粧板の寸法安定性、特に繊維方向の寸法安定性が改善された。また、突板裏打ちシートの表面に切り込みを設けることにより、床材用木質複合化粧板の端部が浮き上がる谷反りの発生も半減させることができた。
以上のことから、突板裏打ちシート表面の突板に切り込みを設けることによって、乾燥時における、床材用木質複合化粧板の寸法安定性、及び谷反りの発生を改善することができるという効果が得られることが確認される。

２−２：突板裏打ちシート表面の切り込みの有無における、湿潤時の床材用木質複合化粧板の反りの程度及び寸法安定性の評価。

上記の本発明試料と比較試料３を温度２０℃、相対湿度５０％の雰囲気中で平衡状態になるまで養生した後、４０℃、相対湿度９５％の雰囲気中に５日間さらした際の、突板裏打ちシート表面の切り込みの有無における、床材用木質複合化粧板の反りの程度及び寸法安定性について評価した。
得られた結果を表３に示す。

寸法安定改善効果及び反り減少効果は、上記と同様に算出した。
突板裏打ちシートの表面に切り込みを設けることによって、床材用木質複合化粧板の寸法安定性、特に繊維方向の寸法安定性が改善された。また、突板裏打ちシートの表面に切り込みを設けることにより、床材用木質複合化粧板の中央部が浮き上がる山反りの発生を、４０％も減少させることができた。
以上のことから、突板裏打ちシート表面の突板に切り込みを設けることによって、湿潤時における、床材用木質複合化粧板の寸法安定性、及び山反りの発生を改善することができるという効果が得られることが判る。 Comparative test 2
The degree of warpage and dimensional stability of the wood composite decorative board for flooring when dry or wet, with or without notching on the surface of the veneer backing sheet, were evaluated.

2-1: Evaluation of the degree of warpage and dimensional stability of the wood composite decorative board for flooring at the time of drying in the presence or absence of cutting on the surface of the veneer backing sheet.

No cuts are formed on the surface of the sample of the present invention having a size of 100 mm × 100 mm and the veneer backing sheet prepared by laminating and bonding the veneer backing sheet of Example 1 and the base material via an epoxy resin adhesive. Except for the above, the same wood composite decorative board for flooring as the sample of the present invention (Comparative Sample 3) was cured until it reached an equilibrium state at a temperature of 24 ° C. and a relative humidity of 85%, and then allowed to stand in a dryer at 60 ° C. for 24 hours The degree of warpage and dimensional stability of the wood composite decorative board for flooring in the presence or absence of cutting of the surface of the veneer backing sheet when placed was evaluated.
The obtained results are shown in Table 2.

The effect of improving the dimensional stability was calculated by [1- (Dimensional change rate of sample with cutting process on the surface of the veneer backing sheet) / (Dimensional change rate of sample without cutting process on the surface of the veneer backing sheet)] × 100 .
Further, the warp reduction effect was calculated by [1− (the warp of the sample having a cutting process on the surface of the veneer backing sheet) / (the warp of the sample having no cutting process on the surface of the veneer backing sheet)] × 100.

By providing cuts on the surface of the veneer backing sheet, the dimensional stability of the wood composite decorative board for flooring, particularly the dimensional stability in the fiber direction, was improved. In addition, by providing a notch on the surface of the veneer backing sheet, it was possible to halve the occurrence of valley warp in which the end of the wood composite decorative board for flooring was lifted.
From the above, by providing cuts on the veneer on the surface of the veneer backing sheet, it is possible to improve the dimensional stability of the wood composite decorative board for flooring and the occurrence of valley warp during drying. That is confirmed.

2-2: Evaluation of the degree of warpage and dimensional stability of the wood composite decorative board for flooring when wet, with or without cutting on the surface of the veneer backing sheet.

The veneer when the sample of the present invention and the comparative sample 3 are cured in an atmosphere of a temperature of 20 ° C. and a relative humidity of 50% until they reach an equilibrium state and then exposed to an atmosphere of 40 ° C. and a relative humidity of 95% for 5 days. The degree of warpage and dimensional stability of the wood composite decorative board for flooring in the presence or absence of cutting on the backing sheet surface were evaluated.
The obtained results are shown in Table 3.

The dimensional stability improvement effect and the warp reduction effect were calculated in the same manner as described above.
By providing cuts on the surface of the veneer backing sheet, the dimensional stability of the wood composite decorative board for flooring, particularly the dimensional stability in the fiber direction, was improved. In addition, by providing a notch on the surface of the veneer backing sheet, it was possible to reduce the occurrence of mountain warp in which the central part of the wood composite decorative board for flooring was raised by as much as 40%.
From the above, by providing a notch in the veneer on the surface of the veneer backing sheet, it is possible to improve the dimensional stability of the wood composite decorative board for flooring and the occurrence of warpage when wet. I understand that.

It is a perspective view which shows one aspect of the wooden composite decorative board for flooring of this invention. It is sectional drawing in the a-a 'line of the wood composite decorative board for flooring of FIG. It is a perspective view at the time of bending the veneer backing sheet of the wood composite decorative board for flooring of the present invention. It is sectional drawing of another aspect of the wood composite decorative board for flooring of this invention. It is sectional drawing which shows the state of the sample of comparative test 1, and a plywood. 5 is a cross-sectional view of a wood composite decorative board for flooring of Comparative Sample 2. FIG.

Explanation of symbols

1. 1. Wood composite decorative board for flooring 2. Veneer backing sheet Laminated substrate 4. 4. DAP resin impregnated paper Synthetic rubber sheet 6. 6. DAP resin impregnated paper Veneer 8 8. Fiber backing material Incision 10. 10. Wood composite decorative board for flooring Thick veneer 12. DAP resin impregnated paper 13. Synthetic rubber sheet 14. DAP resin impregnated paper 15. Laminated substrate 16. Incision 17. Sample 18. Plywood 19 Double-sided tape 20. Base material 21. Veneer backing sheet 22. Wood composite decorative board for flooring

Claims (4)

  Veneer-backed sheet, DAP resin-impregnated paper or wood powder composite resin sheet, synthetic rubber sheet, and DAP resin-impregnated paper or wood powder composite resin sheet are laminated and bonded in this order from above, and the wood composite A wood composite decorative board for flooring, wherein the surface of the veneer backing sheet is formed with a large number of thin cuts extending substantially along the fiber direction of the veneer.   A 0.4-0.8 mm thick veneer, DAP resin-impregnated paper or wood powder composite resin sheet, synthetic rubber sheet, and DAP resin-impregnated paper or wood powder composite resin sheet are laminated and adhered in this order from the top. A wood composite decorative board for flooring, wherein the surface of the veneer is formed with a number of thin cuts extending substantially along the fiber direction of the veneer. Board. Bonding a DAP resin-impregnated paper or a wood powder composite resin sheet to the upper and lower sides of the synthetic rubber sheet to make a laminated substrate;
Forming a large number of thin cuts extending substantially along the fiber direction of the veneer on the surface of the veneer backing sheet;
A method for producing a wood composite decorative board for flooring, comprising the steps of: laminating the veneer backing sheet on the laminated base material and press-adhering to form a wood composite decorative board. Bonding a DAP resin-impregnated paper or a wood powder composite resin sheet to the upper and lower sides of the synthetic rubber sheet to make a laminated substrate;
Forming a large number of thin cuts extending substantially along the fiber direction of the protruding plate on the surface of the protruding plate having a thickness of 0.4 to 0.8 mm;
A method for producing a wood composite decorative board for flooring, comprising the steps of: stacking the projecting board on the laminated base material and pressing and bonding them to make a wood composite decorative board.

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