JP7442008B1 - Components that make up stairs and their manufacturing method - Google Patents

Abstract

The present invention provides a method for manufacturing a component constituting a staircase that can obtain the original color tone of a monochromatic printed layer or a printed layer consisting of a monochromatic pattern. [Solution] A method for manufacturing a component 7 constituting a staircase 1, which includes a preparation step S1 of preparing a wood base material 11 having a wood surface 11f derived from wood; A paint layer forming step S3 of forming the paint layer 23 by painting so as to fill the concave portions 11r and convex portions 11t derived from the resin paint 23A, and inkjet printing on the surface 23a of the paint layer 23. The method includes a printed layer forming step S4 of forming a printed layer 24 of a single color or a pattern of a single color. [Selection diagram] Figure 4

Description

Application of Article 30, Paragraph 2 of the Patent Act 1 [Public exhibition] Publication date: August 26, 2020 to August 27, 2020 Exhibition name: 43rd Housing Construction Materials Comprehensive Exhibition and Sale ( Japan Building Materials Fair) Venue: Tokyo Big Sight East Exhibition Building Halls 1, 2, and 3 2 [Open to the public through sales] Sales date: October 24, 2022 Sales location: Eitai Sangyo Co., Ltd. showroom and the company's sales store 3 [Exhibition] Exhibition Publication] Publication date: August 24, 2020 - August 25, 2020 Exhibition name: 44th Housing Building Materials Comprehensive Exhibition and Sale (Japan Building Materials Fair) Venue: Tokyo Big Sight East Exhibition Building 1, 2, and 3 halls

TECHNICAL FIELD The present invention relates to component parts constituting a staircase and a method for manufacturing the same.

BACKGROUND ART As a staircase installed in a building such as a residence, a staircase is known that includes a plurality of treads and risers arranged in a step-like manner, and side plates that fix these on the left and right sides. Specifically, in such a staircase, a required number of treads that serve as treads are installed in a horizontal position between the left and right side panels at a predetermined interval vertically and longitudinally, and each tread A riser board is placed in between.

For example, Patent Document 1 discloses a method of manufacturing components constituting such stairs. In this manufacturing method, a coating layer coated with water-based paint is formed using a roll coater on a wood base material with a wood surface derived from wood, and then a receiving layer, a printing layer, and a clear coating layer are formed. form a layer.

JP2019-049106A

By the way, in the staircase component according to Patent Document 1, the pattern printed as the print layer is a pattern such as a wood grain pattern, so even if the condition of the underlying wooden surface is reflected on the surface of the component, , the reflection is almost never discernible. However, when forming a printed layer of a single color or a printed layer consisting of a single color pattern, the unevenness or shading of the underlying wooden surface may be reflected, and the color of the printed layer may differ from the expected color. I end up.

The present invention has been made in view of the above-mentioned problems, and provides a component constituting a staircase and a method for manufacturing the same, which can obtain the original color tone of a printed layer of a single color or a printed layer of a single color pattern. It is in.

In view of the above-mentioned problems, the method for manufacturing the component parts of stairs according to the present invention is a method for manufacturing the component parts constituting the stairs, which includes a preparation step of preparing a wood base material having a wood surface derived from wood. and a paint layer forming step of forming a paint layer by painting the wooden surface so as to fill in the concave and convex parts originating from the wood with a resin paint, and a paint layer forming step of forming a paint layer on the surface of the paint layer. , a printing layer forming step of forming a monochromatic printing layer or a printing layer consisting of a monochromatic pattern by inkjet printing.

According to the present invention, in the coating layer forming step, the coating layer is formed by coating the wooden surface so as to fill the concave portions and convex portions derived from the wood with a resin paint. As a result, the anchor effect of the concave and convex portions of the wooden surface suppresses peeling of the paint layer and makes it difficult for the wood grain pattern on the wooden surface, which is the base of the paint layer, to be reflected.

Since a monochromatic printing layer or a printing layer consisting of a monochromatic pattern is formed on the surface of such a paint layer, the surface on which the printing layer is formed can be used as a surface with a monochromatic color that is not affected by the wood grain pattern. It can be visually recognized as. As a result, it is possible to form a uniform monochromatic surface or a surface printed layer consisting of a uniform monochromatic pattern, regardless of the grain pattern of the wooden surface.

In a more preferred embodiment, the wooden surface is a surface made of porous material. According to this aspect, since the wood grain pattern caused by the conduits is difficult to discern in the diffuse porous material compared to the circular porous material, the paint layer is filled with paint to fill in the concave and convex portions of the diffuse porous material due to the conduits. If formed, the grain pattern on the wooden surface will be less likely to be reflected.

This specification also discloses an invention related to component parts that constitute a staircase. Components constituting a staircase according to the present invention are components constituting a staircase, and the component parts include a wooden base material having a wooden surface derived from wood; A paint layer that is painted to fill concave and convex parts derived from wood with a resin paint, and a printing layer that is inkjet printed in a single color or a single color pattern on the surface of the paint layer. It is characterized by

According to the present invention, the paint layer is a layer that is painted so as to fill the concave and convex portions derived from the wood with resin paint, so the anchor effect of the concave and convex portions of the wooden surface allows the coating to be applied. While suppressing layer peeling, the wood grain pattern of the wooden surface that is the base of the paint layer is less likely to be reflected on the surface of the paint layer. Since a monochromatic printing layer or a printing layer consisting of a monochromatic pattern is formed on the surface of such a paint layer, the surface on which the printing layer is formed can be used as a surface with a monochromatic color that is not affected by the wood grain pattern. It can be visually recognized as. As a result, it is possible to form a uniform monochromatic surface or a surface printed layer consisting of a uniform monochromatic pattern, regardless of the grain pattern of the wooden surface.

In a further preferred embodiment, the wooden surface is a surface made of a porous material. According to this aspect, since the wood grain pattern caused by the conduit is difficult to discern in the diffused porous material compared to the circular porous material, the paint is formed to fill in the concave and convex portions of the diffused porous material due to the conduit. The layers make it difficult for the grain pattern on the wooden surface to be reflected.

It is possible to obtain the original color tone of a monochromatic printed layer or a printed layer consisting of a monochromatic pattern.

FIG. 1 is a schematic perspective view of a staircase including staircase components according to an embodiment of the present invention. FIG. 2 is a schematic perspective view of a tread, which is one of the components of the staircase shown in FIG. 1. FIG. FIG. 3 is an enlarged sectional view of a portion of the tread shown in FIG. 2 including a nosing. FIG. 4 is an enlarged sectional view of the tread surface of the treadle shown in FIG. 3; FIG. 2 is a flow diagram of a method for manufacturing a tread, which is one of the components of a staircase, according to the present invention. (a) is a diagram for explaining the coloring process shown in FIG. 5, and (b) is an enlarged sectional view for explaining the colored footboard. (a) is a diagram for explaining the paint layer forming process shown in FIG. 5, (b) is a side view of a roll coater for performing the paint layer forming process, and (c) is a diagram for explaining the paint layer forming process. FIG. 3 is an enlarged cross-sectional view for explaining the formation of. (a) is a diagram for explaining the printing layer forming step shown in FIG. 5, and (b) is an enlarged sectional view for explaining the formation of the printing layer. (a) is a diagram for explaining the clear coating layer forming step shown in FIG. 5, and (b) is an enlarged sectional view for explaining the formation of the clear coating layer.

Embodiments of the present invention will be described below with reference to the drawings.
1. Regarding the stairs 1 FIG. 1 is a schematic perspective view of the stairs 1 according to an embodiment of the present invention. As shown in Fig. 1, a staircase 1 is installed in a building such as a residence, and includes a plurality of treads 3, 3, ... and risers 4, 4, ..., and a pair of side plates that fix these. It is equipped with 5, 5 and. The tread 3, the riser 4, and the side board 5 are the component parts 7 of the staircase 1. The component 7 of the staircase 1 only needs to include at least the tread 3, and may be a staircase without risers or side panels, for example.

In this embodiment, a required number of treads 3 serving as treads 15 are installed in a horizontal position between the left and right side plates 5, 5 at predetermined intervals vertically and front and back, and each tread 3 , 3 is provided with a riser board 4. As shown in FIG. 2, three anti-slip grooves 18 are formed on the tread surface (upper surface) 15 of the tread plate 3 to improve the visibility of the step nosing 16 and to prevent slippage, and on the back surface of the tread plate 3, An insertion groove 17 into which the riser board 4 is inserted is formed.

The upper part of the riser board 4 is inserted into an insertion groove 17 that is recessed a predetermined distance from the front end surface (the nosing 16 side) on the back side of the upper step board 3. The lower part of the riser board 4 is in contact with the rear end surface of the lower step board 3. In this embodiment, the tread surface 15 of the tread plate 3 including the groove 18 is printed as described below, and if necessary, the surface of the step nosing 16 and the back surface of the tread plate 3, which will be described later, are also printed. There is.

2. About the component parts 7 Below, as one of the component parts 7 of the staircase 1, the tread 3 in which the paint layer 20 is formed on the wooden surface 11f of the wooden base material 11 is illustrated, but the riser board 4 or the side board 5 is Alternatively, a coating layer similar to the coating layer of the footboard 3 may be formed on a wood base material. The footboard 3, which is the component 7, includes a wood base material 11 having a wood surface 11f derived from wood, a paint layer 23 formed on the wood surface 11f, and a print layer 24 formed on the surface 23a of the paint layer 23. and a clear coating layer 25 coated on the surface of the printing layer 24.

As shown in FIG. 3, the wood-based base material 11 has underlay layers 11a, 11a bonded to both sides of a base material layer 11b, and a decorative material layer 11c is formed on the surface to be printed. ing. In this embodiment, the base material layer 11b is made of a plurality of plies of plywood, and the underlayers 11a, 11a are made of medium density fiberboard (MDF). The decorative material layer 11c is made of a veneer or a sawn board, and a similar decorative material layer 11g is also formed on the surface of the nosing 16. The surfaces of the decorative material layers 11c and 11g correspond to the wooden surface 11f.

However, the base material layer 11b and underlayers 11a, 11a of the wood-based base material 11 are made of solid wood, particle board (PB), wood fiberboard (insulation board, hardboard, etc.), oriented strand board (OSB). , LVL, laminated wood, or a laminate of these materials. Furthermore, as long as the wooden base material 11 has a wooden surface 11f derived from wood, the wooden base material 11 may be made of solid wood.

In the present embodiment, the wooden surface 11f includes, for example, beach, china, wig, cherry, birch, oak, maple, zelkova, walnut, china, oak, yachidamo, thorn, cypress, cedar, mahogany, teak, and rosewood. The surface may be made of , horse chestnut, black oyster, Japanese elm, elm, birch, rosewood, or ebony. In particular, the wooden surface 11f is preferably a surface made of porous material; for example, the veneer or sawn board of the decorative material layers 11c and 11g are made of porous material. Compared to ring-pored materials, diffuse-pored materials have thinner conduits, a finer surface texture, and a harder to discern wood grain pattern, so the concave and convex portions of diffuse-pored materials due to the conduits were filled in with paint. The paint layer 23 makes it difficult for the wood grain pattern on the wooden surface 11f to be reflected. Preferred examples of the porous material include beech, wig, mahogany, walnut, cherry, birch, maple, and rosewood.

In the embodiment, as shown in FIG. 4, the wooden surface 11f is a colored surface colored with paint, and an impregnated layer 11d impregnated with a pigment or a coloring agent may be formed thereon. This paint may be, for example, a white water-based paint, but is not limited to a water-based paint as long as it can form the impregnated layer 11d with a colored surface.

The paint layer 23 is applied to the wooden surface 11f colored, for example, white, so as to fill the concave portions 11r and convex portions 11t derived from the wood with a resin paint. Paint is a paint in which pigments or colorants are added to transparent resins such as polyester resins, acrylic resins, acrylic silicone resins, epoxy resins, urethane resins, vinyl acetate, and fluorine resins, and for example, paints that are dispersed in organic solvents. You may do so.

In this embodiment, the paint layer 23 is a layer formed by, for example, roll coater painting. The surface of the paint layer 23 is the same surface as the surface 25a of the clear paint layer 25 shown in FIG. As long as the concave portions 11r and convex portions 11t originating from wood can be filled with resin paint, the coating method is not particularly limited, such as spray coating, not limited to roll coater coating.

The printed layer 24 consists of a single color or a single color pattern that is inkjet printed on the surface 23a of the coating layer 23 using, for example, an ultraviolet curable ink 24A. The ultraviolet curable ink used in inkjet printing includes at least an ultraviolet curable resin in which a photopolymerization initiator is added to a reactive oligomer or a reactive monomer, and a colorant. For example, four types of inks are prepared in which four colorants of yellow, magenta, cyan, and black are individually contained in ultraviolet curable resin, and these inks are used to print the surface 23a of the coating layer 23. The above-mentioned colors are used in the above-mentioned colors. In this embodiment, an ultraviolet curable ink is used as an example, but as long as the printing layer 24 consisting of a single color or a single color pattern is formed by inkjet printing, ink such as oil-based ink and water-based ink is not particularly limited. do not have.

The print layer 24 printed on the surface 23a of the paint layer 23 consists of a monochromatic pattern. In this case, for example, a monochromatic pattern (for example, a checkered pattern) made of two or more colors may be repeatedly printed on the surface 23a of the paint layer 23. In addition, the printed layer 24 may be a layer in which two or more divided regions of the surface 23a of the paint layer 23 are painted with different monochrome colors.

The clear coating layer 25 is a layer coated on the surface of the printing layer 24 with a transparent paint made of resin. The transparent paint is a resin paint such as polyester resin, acrylic resin, acrylic silicone resin, epoxy resin, urethane resin, vinyl acetate, or fluororesin. These paints may contain an anti-friction material such as white alumina, green carbon, or ceramic powder that suppresses the wear resistance of the clear paint layer 25.

The clear coating layer 25 is a layer formed on the surface 25a by roll coater coating, which will be described later. Note that the clear coating layer 25 may be omitted, and a protective layer for protecting the printing layer 24 may be formed instead of the clear coating layer 25.

The coating layer 23 is a layer coated with resin paint to fill the concave portions 11r and convex portions 11t derived from wood. Therefore, due to the anchor effect of the concave portions 11r and the convex portions 11t of the wooden surface 11f, the wood grain pattern of the wooden surface 11f, which is the base of the coating layer 23, is reflected on the surface 23a of the coating layer 23 while suppressing peeling of the coating layer 23. It becomes difficult to get involved. Since the printing layer 24 of a single color or the printing layer 24 consisting of a pattern of a single color is formed on the surface 23a of such a paint layer 23, the surface on which the printing layer 24 is formed can be coated with a single color that is not affected by the wood grain pattern. It can be visually recognized as a surface with a .

As a result, regardless of the grain pattern of the wooden surface 11f, it is possible to form a uniform monochromatic surface or a surface printed layer 24 consisting of a uniform monochromatic pattern. Furthermore, since the transparent clear coating layer 25 is formed on the surface of the printed layer 24, the beauty of the surface of the printed layer 24 can be further improved.

Furthermore, since the wooden surface 11f that is the base of the paint layer 23 is colored with a paint such as white, the light LA that has passed from the tread surface 15 of the footboard 3 through the clear paint layer 25, the printed layer 24, and the paint layer 23 is Since diffuse reflection is likely to occur on the white colored wooden surface 11f, the wood grain pattern of the wooden surface 11f is difficult to be reflected on the surface 25a of the clear coating layer 25.

3. Regarding the manufacturing method of the component 7 The method of manufacturing the tread 3, which is one of the component parts 7 of the staircase 1, will be described below with reference to FIGS. 5 to 6D. Note that the riser board 4 or side board 5, which is the component part 7 of the staircase 1, can also be manufactured by the same method, so detailed explanation thereof will be omitted.

3-1. Regarding the preparation step S1 First, the preparation step S1 is performed. In this step, the wooden base material 11 that constitutes the footboard 3 is prepared. Anti-slip grooves 18 are formed on the surface of the wooden base material 11 by groove processing. The anti-slip groove 18 serves both to improve the visibility of the footboard 3 and to prevent it from slipping, and has a V-shaped cross section and a depth of about 1.2 to 2.0 mm. Here, if the grooves 18 are buried in resin or the like before the clear coating layer forming step S5, they will no longer function as anti-slip. It has been cut down to.

In this embodiment, the groove 18 has a V-shaped cross section, but the groove may have a U-shaped, trapezoidal, or rectangular cross-sectional shape, for example. Furthermore, in the preparation step S1, an insertion groove 17 may be formed on the back side of the footboard 3.

3-2. Regarding coloring process S2 Next, coloring process S2 is performed. In this step, as shown in FIG. 6A(a), the spray headers 71A and 71B of the coating device 70A are applied to the wooden surface 11f of the wooden base material 11 corresponding to the tread surface and the nosing surface while being conveyed by the conveying roll 81. Then, the wooden surface 11f is colored with the white paint 21A. White paint is a paint in which a white pigment or coloring agent is added to water or alcohol. Although the white paint was applied using the spray headers 71A and 71B, the white paint may also be applied using, for example, a brush or a roller.

As shown in FIG. 6A(b), the paint is impregnated into the surface layer of the wood base material 11 from the wood surface 11f to form an impregnated layer 11d. Thereafter, the water-based paint is dried by air drying or drying using a dryer or the like. As a result, a white thin film 21 is formed on the wooden surface 11f, following the concave portions 11r and convex portions 11t of the wooden surface 11f. The thin film 21 is a film uniformly formed on the tread surface including the wall surface of the groove 18.

By performing the coloring step S2, the wooden surface 11f, which is the base of the paint layer 23 to be formed in the next step, is colored with white paint, so that from the tread surface 15 of the tread 3 and the nosing 16, the clear paint layer 25, printing The light that has passed through the layer 24 and the paint layer 23 is likely to be diffusely reflected on the white colored wooden surface 11f. Therefore, the pattern on the wooden surface 11f is unlikely to be reflected on the surface 25a of the clear coating layer 25.

3-3. Regarding paint layer forming step S3 Next, paint layer forming step S3 is performed. In this step, as shown in FIG. 6B(a), by painting the wooden surface 11f so as to fill the concave portions 11r and convex portions 11t derived from the wood with the resin paint 23A, the coating layer 23 form. The resin paint 23A has a higher viscosity than a water-based paint, and is a paint in which a pigment or a coloring agent is added to a transparent resin.

In this embodiment, as shown in FIG. 6B(b), the paint layer forming step S3 is performed by roll coater painting using a roll coater 70B. As shown in FIG. 6B(b), in this embodiment, the paint is applied by roll coater painting while pressing the wooden surface 11f with rotating coating rolls 72A and 72B.

In this embodiment, while discharging the paint 23A accumulated between the coating roll 72A (72B) and the backup roll 73A (73B) from between both rolls, the coating roll 72A (72B) is applied to the wooden surface 11f (specifically Then, while pressing the thin film 21), the discharged white paint 23A is applied to the wooden surface 11f (thin film 21).

3-4. Regarding the printed layer forming step S4 Next, the printed layer forming step S4 is performed. In this step, as shown in FIGS. 6C (a) and 6C (b), a monochrome printed layer 24 or a monochrome pattern is formed by inkjet printing on the surface 23a of the coating layer 23 using, for example, an ultraviolet curable ink 24A. A printing layer 24 is formed. Specifically, the ultraviolet curable ink 24A is deposited in granular form by inkjet printing in an uncured state to form a monochromatic printed layer 24 or a printed layer 24 having a monochromatic pattern.

Specifically, the ultraviolet curable ink 24A (hereinafter also referred to as "ink 24A") used for inkjet printing consists of an ultraviolet curable resin in which a photoinitiator is added to a reactive oligomer or a reactive monomer, and a colored and at least an agent. For example, four types of inks 24A are prepared in which four colorants of yellow, magenta, cyan, and black are individually contained in ultraviolet curable resin, and these ultraviolet curable inks 24A are used to form the coating layer 23. It is printed on the surface 23a, and the tread surface is colored in a single color.

Inkjet printing is performed by an inkjet printer 70C. The inkjet printer includes heads 75A and 75B that contain ink 24A used for general printing and eject each ink individually according to a single color. The heads 75A and 75B that print the tread surface reciprocate along the depth direction of the tread plate 3.

The inkjet printer 70C prints the wood-based substrate that will become each footboard 3 using a conveyance roll 81 while jetting from a direction substantially perpendicular to the tread surface 15 of the footboard 3 (specifically, the surface 23a of the coating layer 23). The material 11 is fed in a predetermined direction and the tread surface 15 is colored with the monochromatic color described above, thereby obtaining an uncured printed layer (not shown). The print layer 24 is cured by irradiating the uncured print layer 24 with ultraviolet rays (not shown).

3-5. Regarding clear paint layer forming step S5 Next, clear paint layer forming step S5 is performed. In this step, as shown in FIG. 6D(a), a clear coating layer 25 is formed by coating the surface of the printing layer 24 with a resin-made transparent paint 25A. Note that the roll coater painting is performed by the roll coater 70D, which has the same device configuration as the roll coater 70B explained in the paint layer forming process, so the same reference numerals are given and detailed explanation thereof will be omitted.

In this embodiment, as shown in FIG. 6D(a), by applying a transparent paint 25A while pressing the surface of the printing layer 24 with rotating coating rolls 72A and 72B, as shown in FIG. 6D(a), A clear coating layer 25 is formed.

At this time, by increasing the pressing force of the coating roll 72A (72B) compared to a general pressing force, the outer circumference of the coating roll 72A (72B) is largely elastically deformed. ) and the surface 24a of the printing layer 24.

According to the present embodiment, as shown in FIG. 6B(c), in the paint layer forming step S3, the concave portions 11r and the convex portions 11t derived from wood are applied to the wooden surface 11f using a white resin paint 23A. The coating layer 23 is formed by painting so as to fill the area with. As a result, the anchor effect of the concave portions 11r and the convex portions 11t of the wooden surface 11f suppresses peeling of the paint layer 23, and the wood grain pattern of the wooden surface 11f, which is the base of the paint layer 23, is formed on the surface 23a of the paint layer 23. It becomes difficult to be reflected.

As shown in FIG. 6C(b), a monochromatic printing layer or a printing layer 24 consisting of a monochromatic pattern, which will be described later, is formed on the surface 23a of the coating layer 23, so that the surface on which the printing layer 24 is formed is , it can be visually recognized as a surface with a single color that is not affected by the wood grain pattern.

As a result, as shown in FIG. 6C(b), regardless of the grain pattern of the wooden surface 11f, it is possible to form a uniform monochromatic surface or a surface printing layer 24 consisting of a uniform monochromatic pattern. can. Furthermore, as shown in FIG. 6D(b), since a transparent clear coating layer 25 is formed on the surface of the printed layer 24, the beauty of the surface of the printed layer 24 can be further improved.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention as described in the claims. Changes can be made. The present invention does not include adding the configuration of one embodiment to the configuration of another embodiment, replacing the configuration of one embodiment with another embodiment, or deleting a part of the configuration of one embodiment. You can

For example, in this embodiment, the wooden surface of the wooden base material is colored white by performing a coloring process, but if the wood grain pattern on the wooden surface is not reflected, this process may be omitted. good. Furthermore, in the paint layer formation process and clear paint layer formation process, when forming the paint layer and clear paint layer, a roll coater was used on these surfaces, but if there is no clear paint layer, these layers may be formed by spraying or the like.

1: Stairs, 3: Treads, 4: Riser boards, 5: Side boards, 7: Components, 11: Wooden base material, 11t: Convex parts, 11r: Concave parts, 15: Treads, 23: Paint layer, 23A: Paint, 24: Print layer, 24A: Ultraviolet curable ink, 25: Clear paint layer, 25A: Transparent paint, S1: Preparation process, S3: Paint layer formation process, S4: Print layer formation process, S5: Clear Paint layer formation process

Claims (4)

A method for manufacturing component parts constituting a staircase, the method comprising:
a preparation step of preparing a wood base material having a wood surface derived from wood;
By applying a water-based paint in which a white pigment or colorant is added to water or alcohol to the wooden surface, and forming a white thin film on the wooden surface that follows the concave and convex portions originating from the wooden surface, a coloring step of coloring the wooden surface;
The wooden surface on which the white thin film is formed is painted so as to fill the concave portions and convex portions with a white resin paint made of a transparent resin to which a white pigment or colorant is added. A paint layer forming step of forming a paint layer;
A printing layer forming step of forming a monochrome printing layer on the surface of the coating layer by inkjet printing;
A method of manufacturing a component of a staircase, the method comprising: 2. The method of manufacturing a staircase component according to claim 1, wherein the wooden surface is a surface made of a porous material. A component constituting a staircase,
The component parts are:
A wood base material having a wood surface derived from wood;
A white thin film formed following the concave and convex portions originating from the wooden surface by applying a water-based paint in which a white pigment or colorant is added to water or alcohol to the wooden surface;
The wooden surface on which the white thin film is formed is painted so as to fill the concave portions and convex portions with a white paint made of a transparent resin with a white pigment or coloring agent added thereto. a painted layer;
A component of a staircase, characterized in that the surface of the paint layer is provided with a monochromatic printing layer that is inkjet printed. 4. The staircase component according to claim 3, wherein the wooden surface is a surface made of a porous material.

Images