JP3461463B2 - Architectural decorative material and method for forming curved decorative edge - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative decorative material used for buildings, furniture, etc., a door panel, a structural material, and a decorative frame material in which the edges of a decorative frame material are covered with a decorative plate in a curved shape, and the same. It belongs to the technical field relating to a method of forming a curved decorative edge portion.

[0002]

2. Description of the Related Art Conventionally, for decorative panels such as buildings and furniture, door panels, decorative frame materials, decorative products, etc. It is well known. As such a decorative material, a flexible and flexible decorative sheet such as vinyl chloride resin or polyolefin resin is attached to the surface of a substrate such as plywood, fiberboard, or particle board to form a decorative layer. Becomes
A plurality of back grooves are formed on the back surface of the substrate to form a back groove portion for bending, and after applying an adhesive such as urethane resin or hot melt resin to the back groove portion, the back groove portion is made into a core material of a decorative material. There is one in which a curved decorative edge portion is formed by bending the curved edge portion along the corner edge portion (see, for example, Japanese Patent No. 2863023).

On the other hand, there is also known a decorative plate having a decorative layer which is poor in flexibility and flexibility and has a hard surface.
As such a decorative board, (1) for example, a polyester decorative board (a decorative board obtained by sticking printing paper on a substrate, coating and impregnating the surface of the printing paper with a polyester resin, and curing the resin) , A decorative board obtained by sticking a printing paper on a substrate and then coating and impregnating with a synthetic resin liquid and curing the same. (2) As in the above, after sticking the printing paper on the substrate, a pigment is added to the synthetic resin liquid. A printed board is impregnated with a resin such as a melamine resin or a DAP resin like a decorative board (3) or a melamine decorative board or a DAP decorative board, which is coated and cured with a synthetic resin coating containing a colorant or a colorant. There is a decorative board in which an uncured impregnated paper is placed on a substrate and is pressed by heat to be integrated, and the impregnated paper is cured.

[0004]

By the way, as in the latter case, in a decorative plate having a decorative layer having poor flexibility and flexibility and having a hard surface, the decorative layer is
As shown in FIG. 8, when the curved edge is processed as described above, since the former decorative sheet has no flexibility and flexibility of the vinyl chloride resin decorative sheet and the polyolefin resin decorative sheet and is hard. In the curved bending part a1 of the decorative material a, the decorative layer d on the surface of the decorative plate b is formed.
(C is a substrate) has strong irregularities, whitened streak patterns e, e, ..., or has cracks, which significantly impairs the cosmetic appearance of the decorative material a.
The measure was desired.

The present invention has been made in view of the above problems, and an object thereof is to improve the groove structure of the back groove portion for bending formed on the back surface of the substrate of the decorative plate,
Even if it is a building decorative material consisting of a decorative board having a decorative layer that is poor in flexibility and flexibility and has a hard surface, it is possible to suppress the generation of streak patterns and cracks in the curved decorative edge. , Trying to improve its makeup appearance.

[0006]

In order to achieve the above-mentioned object, according to the present invention, a protrusion is formed on the groove bottom of a plurality of back grooves formed on the back surface of the base plate of the decorative plate, or at both ends. It was decided to make the depth of the back groove to be shallower than the depth of the back groove in the central part.

Specifically, claims 1 to 4 are inventions of a method for forming a curved decorative edge portion of a decorative material for construction, and in the invention of claim 1, a non-flexible hard decorative layer is provided on the substrate surface. On the back side of the base plate of the decorative plate, a plurality of back grooves with a depth that does not reach the decorative layer are formed. As a method of forming a curved decorative edge portion of the architectural decorative material by bending in a contact state to form a curved surface, the groove bottom of each back groove, from the groove bottom to the substrate back surface side It is characterized in that a protruding portion that protrudes toward is formed.

According to the above construction, since the projecting portions projecting toward the back surface are formed at the groove bottoms of the plurality of back grooves on the back surface of the decorative plate, the decorative layer on the surface of the decorative plate is inflexible and hard. Despite this, when the decorative plate is bent into a curved surface, the non-flexible and hard decorative layer is lined by the protrusions of the groove bottoms of the back grooves, and the protrusions are lined. Due to the effect, the decorative layer in that portion is less likely to be damaged, the number of bending positions in each back groove is increased, and the positions are specified, and moreover, the bending portions are easily bent from both sides. Due to such an action, a curved decorative edge that is unlikely to have a bent streak pattern and does not crack, etc. can be smoothly formed with good workability, and is hard and hard to be scratched or stained. The edges of the shape are obtained.

According to the second aspect of the present invention, similarly, on the back surface of the substrate of the decorative plate having the non-flexible hard decorative layer provided on the substrate surface,
A plurality of back grooves with a depth that does not reach the decorative layer is formed, and this decorative plate is curved with the back surface of the substrate at the part where the plurality of back grooves are present is in contact with the corner edge of the core material. As a method of forming a curved edge portion of a decorative material for construction by bending so as to have the following shape, the groove depth of the back grooves at both ends of the plurality of back grooves is formed to be shallower than the back groove in the central part. To do.

That is, since both sides of the curved edge have a smaller inclination of bending than the central portion, by forming the back grooves on both sides at a depth shallower than that of the central portion, it is possible to prevent bending during bending. The influence on the streak pattern and damage to the non-flexible hard decorative layer is reduced. Therefore, it is possible to satisfactorily prevent the occurrence of defects such as streak patterns and cracks at both ends of the curved edge that are likely to occur when a plurality of back grooves are formed with a uniform groove depth, and have a good-looking curved edge. Can be formed.

According to the third aspect of the present invention, similarly, on the back surface of the base plate of the decorative plate having a non-flexible hard decorative layer provided on the front surface of the base plate,
A plurality of back grooves with a depth that does not reach the decorative layer is formed, and this decorative plate is curved with the back surface of the substrate at the part where the plurality of back grooves are present is in contact with the corner edge of the core material. As a method of forming a curved edge portion of the architectural decorative material by bending so as to obtain the following, a protruding portion protruding from the groove bottom toward the back surface side of the substrate is formed at the groove bottom of each back groove. In addition, the groove depth of the back grooves at both ends of the plurality of back grooves is made shallower than that of the center back groove. As a result, the actions according to the inventions of claims 1 and 2 are synergistically obtained, and the curved edge portion having a better appearance can be formed.

According to a fourth aspect of the present invention, in the method of the first or third aspect, the back surface of the substrate is cut by using a saw blade whose blade edges are alternately inclined in opposite directions. A protruding portion that protrudes in a substantially mountain shape toward the back surface side of the substrate is formed. With this configuration, the back groove can be processed with high productivity without requiring a complicated processing device.

[0013] Claims 5 to 7 are inventions of architectural decorative materials, and in the invention of claim 5, a plurality of depths not reaching the decorative layer are provided on the back surface of the substrate having a non-flexible hard decorative layer on the surface. The decorative plate is provided with a back groove of the strip, and the decorative plate has a curved surface in a state where the back surface of the substrate of the portion having the back grooves of the plurality of strips is in contact with the corner edge of the core material. As a building decorative material that is bent and provided with curved decorative edges,
It is assumed that a projecting portion projecting from the groove bottom toward the back surface side of the substrate is formed on the groove bottom of each of the back grooves. Therefore,
With this configuration, the same operational effect as the invention of claim 1 can be obtained.

According to the sixth aspect of the present invention, similarly, a decorative plate having a plurality of back grooves having a depth not reaching the decorative layer is provided on the back surface of the substrate having the inflexible hard decorative layer on the surface. ,
This decorative plate is bent to form a curved surface in a state where the back surface of the substrate in the portion having the plurality of back grooves is brought into contact with the corner edge portion of the core material, and a curved decorative edge portion is provided. As the architectural decorative material, the back grooves on both sides of the plurality of back grooves are formed to have a groove depth shallower than that of the center back groove. As a result, the same operational effect as the invention of claim 2 can be achieved.

According to the seventh aspect of the invention, similarly, a decorative plate having a plurality of back grooves having a depth not reaching the decorative layer is provided on the back surface of the substrate having the inflexible hard decorative layer on the surface. ,
This decorative plate is bent to form a curved surface in a state where the back surface of the substrate in the portion having the plurality of back grooves is brought into contact with the corner edge portion of the core material, and a curved decorative edge portion is provided. As a decorative material for construction consisting of, a projecting portion projecting from the groove bottom toward the back side is formed at the groove bottom of each of the back grooves, and the groove depth of the back grooves at both ends of the plurality of back grooves. Is formed to be shallower than the central back groove. According to this invention, the same operational effect as that of the invention of claim 3 can be obtained.

[0016]

FIG. 4 shows a door panel A as a building decorative material according to an embodiment of the present invention. The door panel A is made of a core material 1 and an adhesive agent attached to its surface. The integrated decorative plate 3 is provided, and curved decorative edges A1 and A1 are formed at the front and back corners.

The decorative plate 3 comprises a substrate 4 and a non-flexible hard decorative layer 5 provided on the surface thereof.
For example, wood fiberboard such as MDF and hardboard, plywood, L
It is made of wood board material such as VL, particle board, and thin wood board.

On the other hand, as the non-flexible hard decorative layer 5, for example, a printed decorative paper on which a wood grain pattern or the like is printed is stuck on the surface of the substrate 4, and a non-flexible hardened polyester resin or the like is applied thereon. After coating and impregnating a resin solution for forming a hard layer, the resin solution is cured, and a printed decorative paper on which a wood grain pattern or the like is printed is attached to the surface of the substrate 4, and an acrylic resin is applied thereon. , Urethane resin, etc., if necessary,
A colorant, an abrasion resistant material such as alumina powder, a diluent, or the like, which is prepared by mixing and adjusting a synthetic resin coating material that forms a non-flexible hard layer after curing, or the surface of the substrate 4 Melamine resin, DA on printed decorative paper printed with wood grain pattern etc.
It is possible to use a resin-impregnated paper which is impregnated with a synthetic resin liquid such as P resin and is pre-cured, and the resin-impregnated paper is integrated with the substrate 4 and cured.

As the above-mentioned printed decorative paper, in addition to ordinary ones, Japanese paper, titanium paper and the like can be used. Alternatively, after printing unprinted paper on the substrate 4, an arbitrary printed pattern may be formed on the substrate 4 by means of transfer or the like.
Further, a decorative veneer may be used instead of the printed decorative paper. Further, the above-mentioned decorative layer 5 can be further coated with a top clear coating of acrylic or urethane type.

The decorative board 3 thus obtained is harder and less susceptible to scratches and stains, and has an excellent decorative appearance, as compared with a decorative sheet such as a vinyl chloride resin decorative sheet attached. If the decorative plate 3 is too thin, the strength will be insufficient, and if it is too thick, it will be difficult to form a curved surface. Therefore, the decorative plate 3 has a thickness of 1.0 to 6.0 mm, preferably 1.5 mm to 4 m.
It is preferable to form it to about m.

Then, the back surface 2 of the substrate 4 of the decorative plate 3 is
For example, five back grooves 7a to 7e having a depth that does not reach the decorative layer 5 on the surface thereof are formed at predetermined portions of the surface, and this decorative plate 3 is a portion having the above-mentioned five back grooves 7a to 7e. Each curved decorative edge portion A1 is formed by bending the back surface of the substrate 4 at a 90 ° angle so as to form a curved surface with the back surface of the substrate 4 in contact with each corner edge portion 1a of the core material 1. .

As an adhesive agent for adhering the decorative plate 3 to the core material 1, for example, an adhesive agent having a high filling property, such as urethane resin or hot melt resin, which can be filled and adhered in the back grooves 7a to 7e is used. It is preferable that the curved decorative edge portion A1 can be reinforced.

Further, as a feature of the present invention, as shown in an enlarged view in FIG. 2, five back grooves 7a to
7e, each of the groove bottoms 8 is provided with a single projecting portion 9 of a substantially mountain shape (having a substantially triangular cross section) having a sharp tip, which protrudes from the groove bottom 8 toward the rear surface side of the substrate 4. There is.

Of these five back grooves 7a to 7e, two back grooves 7a and 7e located at both ends in the arrangement direction.
The groove depth d1 is slightly shallower than the groove depth d2 of the other three back grooves 7b to 7d in the central portion (d1 <d
2). The groove depths d1 and d2 refer to the depths of the bottom grooves 8 to the deepest position in the back grooves 7a to 7e.

Next, a method for manufacturing the door panel A while forming the curved edge portion A1 will be described with reference to FIG. First, with respect to the substrate 4 shown in FIG.
As shown in FIG. 3, the non-flexible hard decorative layer 5 is provided on the surface of the substrate 4 to form the decorative plate 3.

Next, as shown in FIG. 3 (c), the decorative plate 3 having the inflexible hard decorative layer 5 provided on the surface of the substrate 4 in this way is divided into two parts corresponding to the curved bending positions. On the back surface of the substrate 4, five disc-shaped saws are formed by connecting five back grooves 7a to 7e having a comb-like cross-section having a depth not reaching the decorative layer 5 at predetermined intervals as shown in FIG. Blades 11a-1
Engraved with 1e, etc. The back grooves 7a to 7e are not preferable because they may break from the decorative layer 5 when the decorative plate 3 is bent into a curved surface if it penetrates into the decorative layer 5, and if it is too shallow, it is bent into a curved surface. Since it disappears, it is engraved so as to reach or come close to the decorative layer 5.

At this time, as shown in FIG. 1, each of the back grooves 7a to 7e has a substantially mountain-like shape 1 with a sharp tip protruding from the groove bottom 8 toward the rear surface of the substrate 4. The protrusion 9 of the strip is formed. In order to form the substantially mountain-shaped protruding portion 9, as the saw blades 11a to 11e, as shown in FIG. 5, for example, two blade tip portions 12a, 1 adjacent in the circumferential direction are used.
It suffices to use those which are alternately inclined in different directions so that the inclinations of 2b cross each other, and it is possible to form them with good workability.

Of the five back grooves 7a to 7e, the two back grooves 7a and 7e located at both ends have the groove depth d1 of the remaining three back grooves 7b to 7d. It is formed so as to be slightly shallower than the groove depth d2. Groove depth d in this case
1 and d2 are also the depths of the back grooves 7a to 7e to the deepest position. Specifically, the depth position of the groove bottom 8 of the back grooves 7b to 7d located at the center is at the interface between the decorative layer 5 and the substrate 4,
When the depth d2 is d2 = 3.0 mm, the groove depth d1 of the back grooves 7a and 7e at both ends is d1 = 2.8 to 2.9 mm.
It is preferably formed to a certain degree.

Further, when the decorative plate 3 is in a state (planar shape) before being bent, the groove width w of each of the back grooves 7a to 7e is 2 m.
If it is m or more, the decorative layer 5 is easily damaged at the time of bending, while if it is 0.4 mm or less, the saw blade 1 as a cutting tool.
Since 1a to 11e are easily damaged, none of them is preferable, and it is preferable to form the groove width of about w = 0.5 to 1.5 mm.

If the distance between the back grooves 7a to 7e before bending the decorative plate 3 is 2 mm or more, it becomes difficult to bend the back grooves 7a to 7e, and if it is 0.4 mm or less, the back groove 7a during cutting. Since the comb-like portion between 7e and 7e is scattered by the impact, neither is preferable, and 0.5 mm to 1.5 mm
It is preferable to form the groove intervals of about mm.

Next, an adhesive is applied to the entire back surface of the substrate 4, and is a skeleton of the door panel A. The front and back corner edges 1a, 1a of the core material 1 at the side end portions of the door panel A have the above-mentioned back surface. Grooves 7a-7
The rear surface of the substrate 4 at a portion where e is abutted is bent so that both corner edges of the front and back surfaces of the substrate 4 at the abutting portion are curved, and the adhesive is cured. As a result, the above-mentioned corner edge portion of the door panel A and the front and back surfaces or side end faces of the other portions, that is, the portion other than the bent portion of the decorative plate 3 are the corresponding frameworks of the door panel A. 1 is bonded with an adhesive agent, and the curved decorative edges A1 and A are provided on both front and back corner edges.
A door panel A having 1 is formed.

At that time, depending on the type of the adhesive,
In order to accelerate the curing, means such as heating, heating / pressurizing, and high frequency heating can be used.

Therefore, in this embodiment, each back groove 7 on the rear surface of the substrate 4 of the decorative plate 3 on the front surface of the door panel A is used.
Since the projecting portions 9 projecting to the rear surface side of the substrate 4 are provided on the groove bottoms 8 of a to 7e, when the decorative plate 3 is bent along the core material 1 as described above, the projecting portions are formed in the respective back grooves 7a to 7e. 9
Both ends are easily bent, and the decorative layer 5 in this portion is less likely to be damaged due to the backing effect of the protruding portion 9, so that each of the back grooves 7a to 7e is different from the back groove having no protruding portion 9 on the groove bottom 8.
The number of bending positions at the position increases, and the position is also specified. Therefore, even if the decorative layer 5 of the decorative plate 3 is a non-flexible hard decorative layer, the curved decorative edges A1 and A1 at the corner edges of the front and back of the door panel A may have defects such as streaks. It can be formed satisfactorily and with good workability without production.

Further, in the curved decorative edge portion A1 at each corner edge portion of the door panel A, the bending inclination of both side portions is smaller than that of the central portion, and the five back grooves 7a to 7e are formed. Of these, the groove depths d1 of the back grooves 7a and 7e at both ends at positions corresponding to both sides of each curved decorative edge A1 are formed to be shallower than the groove depth d2 of the back grooves 7b to 7d at the central portion. Because
The influence on the non-flexible hard decorative layer 5 when bent is less affected by streak patterns and breakage, and the occurrence of defects such as streak patterns on both ends of the curved decorative edge A1 that are particularly noticeable because they are close to the surface Can be satisfactorily reduced.

That is, the door panel A in which the curved decorative edges A1 and A1 of the front and back corner edges are formed in this way
Since the streak pattern and the like do not appear on each of the curved makeup edge portions A1, the makeup appearance is remarkably improved.

(Other Embodiments) In the above embodiment,
The protrusion 9 of the groove bottom 8 of each of the back grooves 7a to 7e on the rear surface of the substrate 4 of the decorative plate 3 has a substantially mountain shape with a sharp tip, but it may of course be formed in another shape. The point is that the projecting portion 9 projects from the groove bottom 8 toward the back surface side of the substrate 4. For example, as shown in FIG. 7A, it may be formed on a mountain-shaped protruding portion 9 having a rounded curved surface, or as shown in FIG. The protrusions 9, 9 of a plurality of stripes may be formed in such a shape that they are connected in the groove width direction, or as shown in FIG. 7C, the protrusions 9 having a substantially trapezoidal cross section should be formed. You can also Further, the number of the back grooves 7a to 7e is not limited to 5 as in the above embodiment, and may be a plurality of, but it is desirable to provide 3 or more.

In the above embodiment, the door panel A is shown as a decorative material for construction, but in addition, decorative parts such as buildings and furniture, door panels, structural materials, decorative frame materials, etc. are applied to the edges. Any architectural decorative material can be used as long as it is covered with the plate 3 in a curved shape, and can be applied when forming the curved decorative edge portion.

[0038]

As described above, according to the invention of claim 1 or 5, a plurality of back grooves are formed on the back surface of the substrate of a decorative plate having a non-flexible hard decorative layer on its surface, and this decorative plate is formed. In the case of forming the curved decorative edge of the architectural decorative material by bending so that the substrate back surface of the part with the back groove is in contact with the corner edge of the core material, it is curved By forming a protrusion on the groove bottom of each back groove toward the back side of the substrate from the groove bottom, even if the decorative layer of the decorative plate is a non-flexible hard decorative layer, the curved decorative edge Can be formed satisfactorily and with good workability without causing defects such as streak patterns.

According to the second or sixth aspect of the invention, among the plurality of back grooves, the back grooves at both ends are formed to have a depth smaller than that of the back groove in the central portion. It is possible to favorably suppress the occurrence of defects such as streak patterns on both ends of the curved edge portion.

According to the third or seventh aspect of the present invention, the protrusions projecting toward the back surface are formed at the groove bottoms of the respective back grooves, and the groove depths of the back grooves at both ends are made shallower than those of the central back groove. By doing so, the actions according to the inventions of claim 1 or 5 and claim 2 or 6 are synergistically obtained, and it is possible to form a curved edge portion having a better appearance.

According to the fourth aspect of the present invention, the back surface of the substrate is cut by a saw blade whose blade edges are alternately inclined in opposite directions to form a substantially mountain-shaped protruding portion on the groove bottom of each back groove. The back groove can be processed with high productivity without requiring a complicated processing device.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view showing a back groove of a decorative plate before bending in Embodiment 1 of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a curved decorative edge portion of a door panel formed by bending a decorative plate and adhering it to a core material.

FIG. 3 is a process drawing showing a process up to forming a back groove on the back surface of the decorative plate.

FIG. 4 is a side view showing a main part of a door panel.

FIG. 5 is an enlarged cross-sectional view showing a blade tip portion of each saw blade.

FIG. 6 is a cross-sectional view showing the overall configuration of a saw blade.

FIG. 7 is a view corresponding to FIG. 1 showing another embodiment of the present invention.

FIG. 8 is a perspective view showing a curved decorative edge portion of a conventional decorative material.

[Explanation of symbols]

A door panel (cosmetic material for construction) A1 curved edge 1 core material 3 Veneer 4 substrates 5 Non-flexible hard cosmetic layer 7a to 7e Back groove 8 groove bottom 9 Projection 11a-11e saw blade 12a, 12b cutting edge d1, d2 groove depth

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) B27M 1/00-3/38 E04C 2/12 E04C 2/30

Claims (7)

(57) [Claims] 1. A plurality of back grooves having a depth that does not reach the decorative layer are formed on the back surface of the decorative plate having a non-flexible hard decorative layer on the surface of the substrate, and This is a method of forming a curved decorative edge of a building decorative material by bending it so that it has a curved shape with the back surface of the substrate where the back groove is present being in contact with the corner edge of the core material. A method for forming a curved decorative edge portion for a decorative architectural material, characterized in that a projecting portion projecting from the groove bottom toward the back surface side of the substrate is formed at the groove bottom of each of the back grooves. 2. A plurality of back grooves having a depth that does not reach the decorative layer are formed on the back surface of the decorative plate having a non-flexible hard decorative layer on the surface of the substrate, A method of forming a curved edge portion of a building decorative material by bending the substrate back surface of a portion having a back groove to a corner edge portion of a core material so as to be curved. A method for forming a curved decorative edge portion for a decorative architectural material, characterized in that the groove depth of the back groove at both ends of the plurality of back grooves is formed to be shallower than that of the back groove in the central portion. 3. A plurality of back grooves having a depth not reaching the decorative layer are formed on the back surface of the decorative plate having a non-flexible hard decorative layer on the surface of the substrate, and A method of forming a curved edge portion of a building decorative material by bending the substrate back surface of a portion having a back groove to a corner edge portion of a core material so as to be curved. A protrusion is formed at the groove bottom of each of the above-mentioned back grooves and protrudes from the groove bottom toward the back surface side of the substrate. A method for forming a curved decorative edge portion of a decorative material for construction, which is characterized by making it shallower than the above. 4. The method for forming a curved decorative edge of a building decorative material according to claim 1 or 3, wherein the back surface of the substrate is cut using a saw blade whose blade edges are alternately inclined in opposite directions. A method for forming a curved decorative edge portion for a building decorative material, characterized in that a protruding portion that protrudes in a substantially mountain shape toward the back surface side is formed on the groove bottom of the back groove. 5. A decorative plate having a plurality of back grooves having a depth that does not reach the decorative layer is provided on the back surface of a substrate having a non-flexible hard decorative layer on the front surface thereof, and the decorative plate is the plurality of linear grooves. It is a decorative material for construction that is bent to form a curved surface with the back surface of the substrate in the part with the back groove being in contact with the corner edge of the core material and provided with a curved decorative edge. A decorative material for construction, characterized in that a projecting portion projecting from the groove bottom toward the back surface side of the substrate is formed at the groove bottom of each of the back grooves. 6. A decorative plate having a plurality of back grooves having a depth not reaching the decorative layer is provided on the back surface of a substrate having a non-flexible hard decorative layer on the front surface thereof, and the decorative plate is the plurality of linear grooves. It is a decorative material for construction that is bent to form a curved surface with the back surface of the substrate in the part with the back groove being in contact with the corner edge of the core material and provided with a curved decorative edge. A decorative material for architecture, characterized in that among the plurality of back grooves, the back grooves at both ends are formed to have a groove depth shallower than that of the back groove in the central portion. 7. A decorative plate having a plurality of back grooves having a depth that does not reach the decorative layer is provided on the back surface of a substrate having a non-flexible hard decorative layer on the front surface, and the decorative plate is the plurality of linear grooves. It is a decorative material for construction that is bent to form a curved surface with the back surface of the substrate in the part with the back groove being in contact with the corner edge of the core material and provided with a curved decorative edge. In addition, a projecting portion projecting from the groove bottom toward the back surface side is formed at the groove bottom of each of the above-mentioned back grooves, and the groove depth of the back grooves at both ends among the plurality of back grooves is the center back surface. A decorative material for construction characterized by being formed shallower than a groove.