JP2018087436A - Floor material and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor material small in warping and a dimensional change.SOLUTION: A floor material 10 of the present invention is 7.0 mm or less in the total thickness, and comprises a wooden base material layer 2 having a first veneer layer 2a, a second veneer layer 2b, a third veneer layer 2c, a fourth veneer layer 2d and a fifth veneer layer 2e in order and a decorative material layer 1 adhered to a surface of the first veneer layer 2a and being 1.0-2.0 mm in a thickness, and the first veneer layer 2a, the third veneer layer 2c and the fifth veneer layer 2e are a cloth veneer layer orthogonal to the longitudinal direction of the floor material in the fiber direction, and the second veneer layer 2b and the fourth veneer layer 2d are a parallel veneer layer being parallel to the longitudinal direction of the floor material in the fiber direction, and a thickness of the first veneer layer 2a is larger than a thickness of the fifth veneer layer 2e.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a flooring and a manufacturing method thereof.

  For flooring used in detached houses, condominiums and other buildings, in addition to solid flooring made of solid wood, the surface of a wooden substrate made of plywood, MDF, particle board, or these wooden substrates For example, there is a decorative flooring material in which a decorative material of a name tree is pasted on the surface of a laminated wood base material (hereinafter, the laminated wood base material is also simply referred to as a “wood base material”).

  The decorative flooring material uses a base material that has less expansion and contraction due to moisture than solid wood, and various coatings are applied to the surface to prevent moisture from entering the interior. It has been used in many construction sites because it has less warpage and is easy to handle.

  Woody decorative materials used for decorative sticking flooring materials are roughly classified into thin plates having a thickness of about 0.2 to 0.6 mm and thick plates having a thickness of about 0.7 to 3.0 mm. The thin plate is manufactured by cutting a combination of a plurality of wood blocks bonded together with a slicer. The board manufactured by such a manufacturing method is called a veneer. On the other hand, the thick plate may be a veneer, but a relatively thick one of 1.0 mm or more is often manufactured by cutting a piece of wood with a band saw or the like. A board manufactured by such a manufacturing method is called a saw board.

  In the Japanese Patent Application Laid-Open No. 2014-66126 (Patent Document 1), the applicant has a wooden decorative material having a thickness of 1.0 to 3.0 mm and a wooden decorative material 1 having a thickness of 1.0 to 3.0 mm. And a veneer in which the fiber directions are orthogonal to each other, a plywood having a thickness of 5.0 to 12 mm, and a buffer material having a thickness of 1.5 to 10 mm are sequentially laminated and bonded, and the plywood is made of wood. A wooden flooring that has been divided into a plurality by back grooves perpendicular to the longitudinal direction of the flooring is proposed. According to this invention, while being excellent in soundproofing and rigidity, even if a decorative material having a thickness of 1.0 mm or more is used, it is possible to suppress warpage, dimensional change, and the like.

JP 2014-66126 A

  There is a demand for a decorative flooring material to reduce the thickness of the flooring material while increasing the thickness of the natural wood decorative material as a surface material. This is because a thin flooring material can be easily constructed, and when used in renovation, it can be stored better, and there is a merit that less wood is used and less waste material is used. Specifically, there is a demand to use a natural wood decorative material having a thickness of 1.0 mm or more and to suppress the total thickness of the floor material to 7.0 mm or less. However, in such a configuration, the wood base layer has to be relatively thin, warping occurs in the manufacturing process, and dimensional changes during use increase.

  In Patent Document 1, the plywood is divided into a plurality of back grooves perpendicular to the longitudinal direction of the wooden flooring, thereby suppressing warpage, dimensional change and the like even when a decorative material having a thickness of 1 mm or more is used. It can be done. However, since the back groove is formed and a buffer material having a thickness of 1.5 to 10 mm is provided on the back surface, the manufacturing cost is increased.

  The present inventors have aimed to provide a flooring that is small in warpage and dimensional change without adopting such a configuration.

  [1] A wood substrate layer comprising a first veneer layer, a second veneer layer, a third veneer layer, a fourth veneer layer and a fifth veneer layer in order, and a surface of the first veneer layer A flooring material having a total thickness of 7.0 mm or less, wherein the first single plate layer and the third single layer are provided. The plate layer and the fifth single plate layer are cross single plate layers whose fiber direction is orthogonal to the longitudinal direction of the flooring, and the second single plate layer and the fourth single plate layer have the fiber direction. A flooring material, which is a parallel single plate layer parallel to a longitudinal direction of the floor material, wherein the thickness of the first single plate layer is larger than the thickness of the fifth single plate layer.

  [2] The flooring according to [1], wherein the thickness of the first single plate layer is 1.5 times or more the thickness of the fifth single plate layer.

  [3] The thickness of the first veneer layer is 1.0 to 2.0 mm, and the thickness of the fifth veneer layer is 0.3 to 1.0 mm. ] Flooring.

  [4] The above [1] to [3], wherein the wood substrate layer is obtained by bonding the first single plate layer and the fifth single plate layer to a three-ply plywood having a thickness of 2.5 to 3.5 mm. ] Any flooring.

[5] Ratio (t _c / t _t) of the total thickness t _c of the first single plate layer, the third single plate layer, and the fifth single plate layer to the total thickness t _t of the wood base layer ), The flooring material according to any one of [1] to [4], which is 0.60 to 0.75.

[6] On the surface of the first base plate layer, the wood base layer comprising the first single plate layer, the second single plate layer, the third single plate layer, the fourth single plate layer, and the fifth single plate layer in order. A method of manufacturing a flooring comprising a decorative material layer having a thickness of 1.0 to 2.0 mm, which is affixed and having the following steps (A1) to (A4) Method.
(A1) a step of preparing a three-ply plywood, two cross veneers in which the fiber direction is orthogonal to the longitudinal direction of the flooring and having different thicknesses, and the decorative material,
(A2) a step of applying an adhesive to one surface of the three-ply plywood and bonding a relatively thin cross veneer to form the fifth veneer layer;
(A3) applying an adhesive to the other surface of the three-ply plywood to bond a relatively thick cross veneer to form the first veneer layer; and
(A4) The process of apply | coating an adhesive agent to the surface of the said 1st single board layer, adhere | attaching a cosmetic material, and setting it as the said cosmetic material layer.

  [7] The production method of the above [6], wherein the steps (A1), (A2), (A3) and (A4) are sequentially performed.

[8] On the surface of the first base plate layer, a wood substrate layer comprising a first single plate layer, a second single plate layer, a third single plate layer, a fourth single plate layer, and a fifth single plate layer in this order. A method for producing a flooring material comprising a decorative material layer having a thickness of 1.0 to 2.0 mm, the flooring material comprising steps (B1) to (B4) below: Method.
(B1) a step of preparing a three-ply plywood, a fiber direction perpendicular to the longitudinal direction of the flooring, and preparing two cross single plates and the decorative material,
(B2) Adhesive is applied to one surface of the three-ply plywood, one cross veneer is bonded, the adhesive is applied to the other surface of the three-ply plywood, and the other cross veneer is Bonding process,
(B3) At least one of the two cross single plates is ground, the thicker single plate layer is defined as the first single plate layer, and the thin single plate layer is defined as the fifth single plate layer. The process of
(B4) The process of apply | coating an adhesive agent to the surface of the said 1st single board layer, adhere | attaching a cosmetic material, and setting it as the said cosmetic material layer.

  [9] The method for producing a flooring material according to any one of the above [6] to [8], wherein a hot melt adhesive is used and a cold press is used for bonding the cloth single plate and / or the decorative material.

  [10] The bonding between the three-ply plywood and the first single plate layer is performed by a hot press, and the bonding between the three-ply plywood and the fifth single plate layer is performed by a cold press. [9] The method for producing a flooring material according to any one of the above.

[11] A wood substrate layer comprising a first veneer layer, a second veneer layer, a third veneer layer, a fourth veneer layer and a fifth veneer layer in order, on the surface of the first veneer layer A method for producing a flooring material comprising a decorative material layer having a thickness of 1.0 to 2.0 mm, the flooring material comprising steps (C1) to (C3) below: Method.
(C1) preparing a 5-ply cross plywood,
(C2) At least one surface of the five-ply cross plywood is ground, and among the single plate layers on the surface, the thicker single plate layer is used as the first single plate layer, and the thin single plate layer is used as the fifth single plate layer. A step of making a plate layer,
(C3) The process of apply | coating an adhesive agent to the surface of the said 1st single board layer, adhere | attaching a cosmetic material, and setting it as the said cosmetic material layer.

  ADVANTAGE OF THE INVENTION According to this invention, a flooring with a small curvature and a dimensional change can be provided.

The figure which illustrated the flooring concerning this embodiment

  A flooring according to the present embodiment and a method for manufacturing the flooring will be described with reference to FIG.

1. As shown in FIG. 1, a flooring 10 according to this embodiment is a flooring having a decorative material layer 1 and a wood base material layer 2 and having a total thickness of 7.0 mm or less. . The width and length of the flooring 10 are not particularly limited. Usually, the width is 150, 300, 303 mm, and the length is 900, 1800, 1818 mm. The thickness is preferably thin from the viewpoint of workability (for reasons such as easy cutting and little waste material), but from the viewpoint of rigidity, it is preferably 5.0 mm or more. 6.0 mm or more is more preferable.

  As the decorative material layer 1 according to the present embodiment, a decorative material obtained by processing natural wood such as a veneer or a ground board can be used. In particular, natural wood of a ground board is preferable. If the decorative material layer 1 is too thin, the design property is deteriorated, and there is a concern about the projection of the wood base material layer 2, so that the thickness of the decorative material layer 1 is 1.0 mm or more. More preferably, it is 1.2 mm or more. However, the thicker the decorative material layer 1 is, the higher the cost is, and the larger the dimensional change such as warpage becomes, so that it is difficult to handle. Therefore, the thickness of the decorative material layer 1 is preferably 2.0 mm or less.

  The wood base layer 2 according to the present embodiment includes a first single plate layer 2a, a second single plate layer 2b, a third single plate layer 2c, a fourth single plate layer 2d, and a fifth single plate layer 2e in this order. The decorative material layer 1 is bonded to the surface of the first veneer layer 2a. The first veneer layer 2a, the third veneer layer 2c, and the fifth veneer layer 2e are cross veneer layers whose fiber directions are orthogonal to the longitudinal direction of the flooring (left and right direction in FIG. 1). is there. The second single plate layer 2b and the fourth single plate layer 2d are parallel single plate layers whose fiber directions are parallel to the longitudinal direction of the flooring. And in the flooring 10 which concerns on this embodiment, it is the biggest characteristic that the thickness of the 1st single board layer 2a is larger than the thickness of the 5th single board layer 2e.

  That is, when using a natural wood decorative material having a thickness of 1.0 mm or more and suppressing the total thickness of the flooring to 7.0 mm or less, the wooden substrate layer 2 must be relatively thin, Warpage occurs in the manufacturing process, and the dimensional change during use increases. The present inventors conducted research on the premise that the wood base material layer 2 is a plywood using a cross veneer as a surface single plate layer (first single plate layer 2a and fifth single plate layer 2e). However, it was not possible to sufficiently suppress the warpage and dimensional change of the flooring simply by using a single cloth plate. Therefore, in the state before applying the decorative material layer 1, a wooden base material 2 having a convex warp in the width direction (short direction of the flooring 10) is prepared, and the decorative material layer 1 is applied to the convex surface side. As a result, the warpage and dimensional change of the flooring can be made sufficiently small.

  Then, by making the thickness of the first veneer layer 2a larger than the thickness of the fifth veneer layer 2e, it is possible to impart a convex warpage in the width direction to the wooden substrate 2 before the decorative material layer 1 is attached. In particular, by setting the thickness of the first veneer layer 2a to be 1.5 times or more the thickness of the fifth veneer layer 2e, the width of the first veneer layer 2a before the veneering material layer 1 is stably applied is reduced. A convex warp in the direction can be imparted. The thickness of the first single plate layer 2a is preferably 2.0 times or more the thickness of the fifth single plate layer 2e.

  In the wood substrate layer 2 according to the present embodiment, the thickness of the first veneer layer 1a is preferably 1.0 to 2.0 mm. If the thickness of the 1st single board layer 1a is less than 1.0 mm, the width direction of a flooring will become a concave curvature, and if it exceeds 2.0 mm, the convex curvature of the width direction of a flooring will become excessive. A preferred lower limit is 1.2 mm. The thickness of the fifth single plate layer 1e is preferably 0.3 to 1.0 mm. If the thickness of the fifth veneer layer 1e is less than 0.3 mm, the convex warpage in the width direction of the flooring becomes excessive, and if it exceeds 1.0 mm, the width direction of the flooring becomes concave. A preferred lower limit is 0.4 mm and a preferred upper limit is 0.8 mm.

In the wood substrate layer 2 according to the present embodiment, it is important to relatively increase the cross ratio. The cross ratio is the ratio of the total thickness t _c of the first veneer layer, the third veneer layer and the fifth veneer layer to the total thickness t _t of the wood substrate layer (t _c / t _t ). Then, if the cross ratio _(t c _/ t _t) of 0.60 or more can impart a convex warp of the width direction in front of the wood substrate 2 to give stable bond the facing layers 1. On the other hand, if the cross ratio (t _c / t _t ) exceeds 0.75, the convex warpage may be too large. Therefore, the cross ratio (t _c / t _t ) is preferably 0.60 to 0.75. The preferable lower limit of the cross ratio (t _c / t _t ) is 0.65, and the preferable upper limit is 0.70.

  Although there is no restriction | limiting in the material of each layer which comprises the woody base material layer 2, For example, single plates, such as a lauan, a falcata, eucalyptus, a chamelet, rubber | gum, a cedar, and a larch, can be used.

2. Manufacturing method of flooring according to this embodiment The flooring according to this embodiment can be manufactured by the following steps (A1) to (A4).
(A1) a step of preparing a three-ply plywood, two cross veneers in which the fiber direction is orthogonal to the longitudinal direction of the flooring and having different thicknesses, and the decorative material,
(A2) a step of applying an adhesive to one surface of the three-ply plywood and bonding a relatively thin cross veneer to form the fifth veneer layer;
(A3) applying an adhesive to the other surface of the three-ply plywood to bond a relatively thick cross veneer to form the first veneer layer; and
(A4) The process of apply | coating an adhesive agent to the surface of the said 1st single board layer, adhere | attaching a cosmetic material, and setting it as the said cosmetic material layer.

  Thereby, the wood base material layer 2 whose thickness of the 1st veneer layer 2a is larger than the thickness of the 5th veneer layer 2e can be obtained. At this time, the order of the step (A2) and the step (A3) is not limited and may be performed simultaneously. In particular, the wood base material layer 2 in the order of the step (A2) and the step (A3). After manufacturing, step (A4) is preferably performed, that is, steps (A1), (A2), (A3) and (A4) are preferably performed in that order. That is, after a relatively thin cross veneer (fifth veneer layer 2e) is attached to one surface of a three-ply plywood and bonded, a relatively thick cross veneer (first veneer layer) is formed on the opposite surface. 2a) should be pasted. This is because, when a relatively thick cloth single plate is pasted first, the warp of the material becomes large, and thereafter, the operation of pasting a relatively thin cross single plate becomes difficult. The thickness of the three-ply plywood is preferably 2.5 to 3.5 mm, and a more preferable upper limit is 3.0 mm.

The flooring which concerns on other this embodiment can be manufactured by the process of following (B1)-(B4).
(B1) a step of preparing a three-ply plywood, a fiber direction perpendicular to the longitudinal direction of the flooring, and preparing two cross single plates and the decorative material,
(B2) Adhesive is applied to one surface of the three-ply plywood, one cross veneer is bonded, the adhesive is applied to the other surface of the three-ply plywood, and the other cross veneer is Bonding process,
(B3) At least one of the two cross single plates is ground, the thicker single plate layer is defined as the first single plate layer, and the thin single plate layer is defined as the fifth single plate layer. The process of
(B4) The process of apply | coating an adhesive agent to the surface of the said 1st single board layer, adhere | attaching a cosmetic material, and setting it as the said cosmetic material layer.

  Thereby, the wood base material layer 2 whose thickness of the 1st veneer layer 2a is larger than the thickness of the 5th veneer layer 2e can be obtained. In the step (B2), an adhesive may be applied to both sides of the three-ply plywood, and a cloth single plate may be attached to both sides of the plywood and bonded simultaneously. Further, in the step (B3), in the step (B2), an adhesive is applied to one surface of the three-ply plywood, and one cross single plate is bonded to the other side of the three-ply plywood. May be performed before the other cross single plate is bonded, or after both cross single plates are bonded.

A commercially available 5-ply cloth plywood is obtained, and one surface is ground to obtain a wood base layer 2 in which the thickness of the first veneer layer 2a is larger than the thickness of the fifth veneer layer 2e. May be. That is, it can be manufactured by the following steps (C1) to (C3).
(C1) preparing a 5-ply cross plywood,
(C2) At least one surface of the five-ply cross plywood is ground, and among the single plate layers on the surface, the thicker single plate layer is used as the first single plate layer, and the thin single plate layer is used as the fifth single plate layer. A step of making a plate layer,
(C3) The process of apply | coating an adhesive agent to the surface of the said 1st single board layer, adhere | attaching a cosmetic material, and setting it as the said cosmetic material layer.

  There are no particular restrictions on the adhesive used for bonding the cross veneer and the decorative material, but it is preferable to use a hot-melt adhesive in at least one of the bonding steps and perform cold bonding. When a water-based adhesive is used, the water content of the substrate is increased and the substrate is elongated, and therefore a non-aqueous hot-melt adhesive is preferable. As the hot melt adhesive, for example, a polyurethane (PUR) adhesive is preferable.

  The three-ply plywood and the first single plate layer 2a may be bonded by hot pressing, and the three-ply plywood and the fifth single plate layer 2e may be bonded by cold pressing. This is because in the case of hot pressing, the moisture content decreases and the base material shrinks.

  In order to confirm the effect of the present invention, various single plates or ground plates are attached to a commercially available three-ply plywood (0.8 mm parallel single plate, 1.2 mm cross single plate, 0.8 mm parallel single plate). Three types of flooring materials shown in 1 were prepared. In any example, the decorative material layer and the wood base material layer are bonded by hot pressing using an SBR-based ethylene vinyl acetate resin adhesive, and the fifth single plate layer and the fourth single plate layer are bonded to each other. It was performed by cold pressing using an aqueous vinyl urethane resin adhesive. In Example 1 and Comparative Example 2, the first single plate layer and the second single plate layer were bonded by hot pressing using an SBR-based ethylene vinyl acetate resin adhesive.

  About each obtained flooring, the dimensional change rate in each direction was measured with the following method, and the result is shown in Table 1.

<Dimensional change rate measurement method>
(1) A test piece cut to 300 mm × 50 mm from each floor material is prepared. At this time, the measurement direction (the length direction when measuring warpage in the length direction and the width direction when measuring warpage in the width direction) is 300 mm.
(2) Next, each test piece is left in an environment of a temperature of 20 ° C. and a humidity of 65% until the mass becomes constant and tempered (water content of about 8 to 12%).
(3) measuring the size _{S 0} and mass _{M 0} temper after specimens.
(4) Each test piece is subjected to a drying test (a test that is left in an environment of a temperature of 40 ° C. and a humidity of 30% for one week) and a moisture absorption test (a test that is left to stand in an environment of a temperature of 30 ° C. and a humidity of 90% for one week) dry test dimension S ₁ and the mass M ₁ of the specimen _after, and to measure the dimension S ₂ and the mass M ₂ of the test piece after moisture absorption test.
(5) For the test piece after the drying test, the test piece after measuring the dimension S ₁ and the mass M ₁ is left in an oven maintained at 105 ° C. for 24 hours, and the mass M ₃ of the test piece in a completely dry state is measured. To do. Further, the test piece after humidity test, a test piece after the measurement of dimension S ₂ and mass M ₂ was left for 24 hours in an oven maintained at 105 ° C., measuring the mass M ₃ of the dry specimen .
(6) based on the following calculation equation to determine the rate of dimensional change MC ₂ in dimensional change MC ₁ and wet test in dry test in each direction.

  As shown in Table 1, in Example 1, the dimensional change rate in both the length direction and the width direction is small under both conditions of drying and moisture absorption. Moreover, since there is no difference in the dimensional change rate in the length direction and the width direction, no twisting occurs. On the other hand, Comparative Example 1 in which a decorative material having the same thickness as the decorative material layer is attached to the back side of the three-ply plywood has a large dimensional change rate in both dry and moisture absorption conditions. Although this flooring material has a good balance between the cross veneer layer and the parallel veneer layer (including the ground plate) as a whole, the wood base material layer does not satisfy the conditions of the present invention, so the dimensional change rate is increased. Yes. Moreover, although the comparative example 2 has the same total thickness as Example 1, the parallel single plate is used for the 5th single plate layer, and the dimension of the width direction became large on dry conditions.

  ADVANTAGE OF THE INVENTION According to this invention, a flooring with a small curvature and a dimensional change can be provided.

DESCRIPTION OF SYMBOLS 1 Cosmetic material layer 2 Wood base material layer 2a 1st single board layer 2b 2nd single board layer 2c 3rd single board layer 2d 4th single board layer 2e 5th single board layer 10 The flooring which concerns on this embodiment

Claims (11)

A wood substrate layer comprising a first veneer layer, a second veneer layer, a third veneer layer, a fourth veneer layer and a fifth veneer layer in order,
A flooring material having a total thickness of 7.0 mm or less, comprising a decorative material layer having a thickness of 1.0 to 2.0 mm adhered to the surface of the first veneer layer,
The first single plate layer, the third single plate layer and the fifth single plate layer are cross single plate layers whose fiber directions are orthogonal to the longitudinal direction of the flooring,
The second single plate layer and the fourth single plate layer are parallel single plate layers whose fiber directions are parallel to the longitudinal direction of the flooring,
The thickness of the first veneer layer is greater than the thickness of the fifth veneer layer;
Flooring. The thickness of the first veneer layer is at least 1.5 times the thickness of the fifth veneer layer;
The flooring according to claim 1. The thickness of the first single plate layer is 1.0 to 2.0 mm,
The thickness of the fifth veneer layer is 0.3 to 1.0 mm.
The flooring according to claim 1 or 2. The wood base layer is bonded to the three-ply plywood having a thickness of 2.5 to 3.5 mm, the first single plate layer and the fifth single plate layer,
The flooring material according to any one of claims 1 to 3. The ratio (t _c / t _t ) of the total thickness t _c of the first veneer layer, the third veneer layer and the fifth veneer layer to the total thickness t _t of the wood substrate layer is 0.60 to 0.75,
The flooring material according to any one of claims 1 to 4. A wood substrate layer comprising a first veneer layer, a second veneer layer, a third veneer layer, a fourth veneer layer, and a fifth veneer layer in order, and affixed to the surface of the first veneer layer A method for producing a flooring comprising a decorative material layer having a thickness of 1.0 to 2.0 mm, comprising the following steps (A1) to (A4).
(A1) a step of preparing a three-ply plywood, two cross veneers in which the fiber direction is orthogonal to the longitudinal direction of the flooring and having different thicknesses, and the decorative material,
(A2) a step of applying an adhesive to one surface of the three-ply plywood and bonding a relatively thin cross veneer to form the fifth veneer layer;
(A3) applying an adhesive to the other surface of the three-ply plywood to bond a relatively thick cross veneer to form the first veneer layer; and
(A4) The process of apply | coating an adhesive agent to the surface of the said 1st single board layer, adhere | attaching a cosmetic material, and setting it as the said cosmetic material layer. The steps (A1), (A2), (A3) and (A4) are sequentially performed.
The manufacturing method of the flooring material of Claim 6. A wood substrate layer comprising a first veneer layer, a second veneer layer, a third veneer layer, a fourth veneer layer, and a fifth veneer layer in order, and affixed to the surface of the first veneer layer A method for producing a flooring comprising a decorative material layer having a thickness of 1.0 to 2.0 mm, comprising the following steps (B1) to (B4).
(B1) a step of preparing a three-ply plywood, a fiber direction perpendicular to the longitudinal direction of the flooring, and preparing two cross single plates and the decorative material,
(B2) Adhesive is applied to one surface of the three-ply plywood, one cross veneer is bonded, the adhesive is applied to the other surface of the three-ply plywood, and the other cross veneer is Bonding process,
(B3) At least one of the two cross single plates is ground, the thicker single plate layer is defined as the first single plate layer, and the thin single plate layer is defined as the fifth single plate layer. The process of
(B4) The process of apply | coating an adhesive agent to the surface of the said 1st single board layer, adhere | attaching a cosmetic material, and setting it as the said cosmetic material layer. When bonding cross veneers and / or decorative materials,
Use hot melt adhesive and adhere by cold pressing,
The method for manufacturing a flooring material according to any one of claims 6 to 8. Bonding the three-ply plywood and the first single plate layer with a hot press,
Bonding the three-ply plywood and the fifth single plate layer with a cold press,
A method for manufacturing a flooring material according to any one of claims 6 to 9. A wood substrate layer comprising a first veneer layer, a second veneer layer, a third veneer layer, a fourth veneer layer, and a fifth veneer layer in order, and affixed to the surface of the first veneer layer A method for producing a flooring comprising a decorative material layer having a thickness of 1.0 to 2.0 mm, comprising the following steps (C1) to (C3).
(C1) preparing a 5-ply cross plywood,
(C2) At least one surface of the five-ply cross plywood is ground, and among the single plate layers on the surface, the thicker single plate layer is used as the first single plate layer, and the thin single plate layer is used as the fifth single plate layer. A step of making a plate layer,
(C3) The process of apply | coating an adhesive agent to the surface of the said 1st single board layer, adhere | attaching a cosmetic material, and setting it as the said cosmetic material layer.

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