JP4775348B2 - Plate-like building material painting method - Google Patents

Description

  The present invention relates to a plate-shaped building material coating method in which a plate-shaped building material is coated by an inkjet coating means.

The surface (upper surface) and the end surface (cut end surface) of a plate-shaped building material (plate-shaped building material) used for building interior materials and exterior materials are painted by various coating methods.
Recently, as one method of painting, ink jet painting that can easily form a local pattern or paint a desired pattern is used.
In such an ink-jet coating, ink droplets are ejected from the ink ejection port in a non-contact state on the surface of the plate-shaped building material to land the ink droplets on the surface to be painted, and a set of minute dots by the landed ink droplets The pattern is formed by.

For example, Patent Document 1 below proposes a method for painting a building board using inkjet painting.
In this configuration, a computer for storing pattern data of a pattern to be painted on a building board, a conveyor for conveying the building board, a painting head disposed above the conveyor, and a coating head in parallel. By spraying ink based on the pattern pattern data from a plurality of jet nozzles that have been arranged to make no contact with the surface of the building board conveyed on the conveyor, the pattern is painted. Yes.
Japanese Patent No. 3115136

By the way, the ink droplets ejected from the ink ejection port are ejected in a liquid column shape and are separated into a plurality of minute ink droplets by the surface tension and air resistance of the ink liquid itself before landing on the surface to be coated. It becomes a mist shape until it reaches the surface to be coated.
In addition, as the pattern becomes more complex, the ejected ink droplets also tend to be miniaturized. When ejected, these minute ink droplets become mist-like and float and fall toward the surface to be coated. .

As in the method for coating a building board described in Patent Document 1, ink is ejected from a jet nozzle that is not in contact with the building board. Therefore, in conventional inkjet painting, the entire surface is painted. In the meantime, there is a problem that the ink droplets that are mist-like as described above float and fall outside the surface of the building board and adhere to the end face of the building board near the periphery of the surface.
In this way, when the ink droplets ejected for surface coating adhere to the end surface of the building board, when the end surface is painted in the previous and subsequent steps, the end surface is double coated and compared to the surface. There is a risk that the color becomes dark or the quality of the pattern on the end face deteriorates.

  In addition, the surface of the plate-shaped building material may be uneven rather than smooth, compared to paper that is the target of printing with ordinary inkjet printers, and the plate-shaped building material is large compared to paper, etc. When the building material and the ink discharge port are moved relative to each other, they may be displaced relatively up and down. Therefore, the distance between the ink discharge port for discharging ink droplets and the surface to be coated is relatively large. There is a need. Even in such a case, the above-mentioned problem becomes remarkable.

  The present invention has been made in view of the above circumstances, and can prevent adhesion of ink droplets ejected vertically from an ink ejection port of an ink jet coating means for surface coating of a plate-shaped building material to an end surface. The object is to provide a plate-like building material coating method.

  In order to achieve the above object, a plate-shaped building material coating method according to the present invention is a plate-shaped building material that is substantially rectangular in plan view by discharging ink droplets vertically downward from an ink discharge port of an inkjet coating means. A plate-shaped building material coating method for painting the surface edge of the plate-shaped building material, wherein the plate-shaped building material is inclined so that one side of the plate-shaped building material is downward and the other side opposite to the one side is upward. With the end face of the one side facing obliquely downward, the ink discharge port and the plate-shaped building material are relatively moved along the one side while facing the surface edge of the one side. Ink droplets are ejected from the ejection port and the surface edge is painted.

Here, the plate-like building material has a plate-like substantially rectangular parallelepiped shape having an end face (a front end), and is a wooden building material, a resin-based building material, or a ceramic building used as an interior building material or exterior building material of a building. Refers to material.
Examples of the wood-based building materials include solid wood, laminated wood, plywood, particle board, wood fiber board, and the like, and those using a veneer or melamine resin as a base material.
Examples of the resin-based building material include a thermosetting resin material and a thermoplastic resin material.
Examples of the ceramic building materials include bricks, tiles, ceramics, and cement ceramic materials containing cement as a main component and reinforcing fibers and inorganic fillers, which are used for outer walls, roofs, fences, and the like.
The plate-like building materials are used for doors, floors, stairs, fences, columns, handrails, shelves, kitchen panels, ceilings, cabinets and top plates for various furniture, inner walls, outer walls, roofs, fences, and the like.
Examples of the pattern applied to the surface edge of the plate-shaped building material by the ink jet coating means include woodgrain, tile, block, single color, and other various patterns.

  In the plate-shaped building material coating method of the present invention, the plate edge of the surface edge of the plate-shaped building material further forming a chamfered inclined surface along the one side at the upper end of the one side. You may make it paint.

  According to the plate-shaped building material coating method according to the present invention, the ink droplets ejected from the ink discharge port vertically downward are one side of the plate-shaped building material downward and the other side facing the one side. Is discharged toward the surface edge of the one side in a state where the plate-shaped building material is inclined so that the end face is inclined downward. Therefore, as described above, the ink droplet that floats and falls off the surface of the plate-shaped building material is attached to the end surface of the one side because the end surface of the one side is inclined downward. Without falling around, it falls down by its own weight. As a result, when the end surface is painted before and after the surface of the plate-shaped building material is painted, the end surface is double coated and darker than the surface, and the quality of the pattern on the end surface is reduced. Can be reduced. Therefore, the plate-shaped building material with high designability can be provided.

  Moreover, in the said plate-shaped building material coating method of this invention, with respect to the plate-shaped building material which further forms the chamfering inclined surface along this one side edge in the end surface upper end of the said one side edge of the said plate-shaped building material. However, in the same manner as described above, by chamfering the surface edge by discharging ink droplets from the ink discharge port with the chamfered inclined surface forming the end surface facing obliquely downward, the chamfer forming the end surface is formed. The ink droplets can be prevented from adhering to the inclined surface as described above.

The best mode for carrying out the present invention will be described below with reference to the drawings.
Drawing 1 is an explanatory view for explaining the tabular building material coating method concerning a 1st embodiment, (a) is a schematic plan view and (b) is a schematic longitudinal section. FIG. 2 is a block diagram illustrating an example of a plate-shaped building material coating apparatus that executes the plate-shaped building material coating method according to the embodiment. FIG. 3 is an explanatory diagram for explaining the process of painting the center of the surface of the plate-shaped building material with the plate-shaped building material coating apparatus, and FIG. 4 is the process of painting the end surface of the plate-shaped building material with the plate-shaped building material coating apparatus. It is explanatory drawing for demonstrating.
In addition, in FIG.1 (b), FIG.3 (b), FIG.4 (b), FIG.5 and FIG.6, the ink droplet discharged from the ink discharge port of each nozzle head is shown typically.

In this embodiment, the plate-shaped building material 10 painted by the plate-shaped building material coating apparatus A is formed into a substantially rectangular parallelepiped shape having an end face (cut end surface) 12, and is made of wood such as laminated wood, plywood, particle board, and wood fiber board. A pattern is applied to the surface 11 and the end surface 12 of each of the surface 11 and the end surface 12 of the base material through the following steps.
In addition, before the surface 11 and the end surface 12 are coated, a white ink receiving layer for fixing ink ejected from the ink jet coating unit 20 described later is formed as a pretreatment on the wooden substrate. .

As the base material used for the plate-shaped building material 10 as described above, other wood-based materials, for example, solid wood, or solid wood, laminated wood, plywood, particle board, wood fiber board and the like, and a protruding board or A melamine resin or the like may be attached.
The base material may be a resin material such as a thermosetting resin material or a thermoplastic resin material. Further, bricks, tiles, ceramics, or cement-based ceramic materials containing cement as a main component and containing reinforcing fibers and inorganic fillers may be used as the base material.
The plate-like building material 10 as described above is used as an interior building material and exterior building material of a building, and includes a door, a floor, a staircase, a fence, a pillar, a handrail, a shelf, a kitchen panel, a ceiling, a cabinet and a top plate for various furniture, Used for inner wall, outer wall, roof, fence, etc.

In the present embodiment, as shown in the figure, the pattern painted on the plate-shaped building material 10 by the inkjet coating unit 20 described later is a wood grain tone, but is not limited to this, and the tile tone, block tone, single color, and the like. Various patterns may be used.
Moreover, in this embodiment, although the pattern is formed only by the surface by the inkjet coating unit 20 on the surface 11 and the end surface 12 of the plate-shaped building material 10, you may make it form a pattern also in the back surface.

Next, an example of an apparatus for coating the plate-shaped building material 10 will be described.
As shown in FIG. 2, the plate-shaped building material coating apparatus A shown in FIG. 2 is roughly composed of an inkjet coating unit 20 for coating each part of the plate-shaped building material 10, a control unit 30 for controlling each part of the apparatus, and a plate. Plate-shaped building material inclination angle varying means 40 for inclining the building material 10 and plate-shaped building material conveying means 50 for conveying the placed plate-shaped building material 10.

The plate-shaped building material conveying means 50 constitutes a moving means for relatively moving the ink discharge ports 21d, 22d, 23d of the respective ink jet coating apparatuses 21, 22, 23 and the plate-shaped building material 10 to be described later, as shown in each drawing. In addition, the base 51, 51A (41) and the conveyor belts 52, 52A are provided, and are controlled in conjunction with the ink discharge operation by each of the inkjet coating apparatuses 21, 22, 23 described later. It is transported in the direction (upward on the paper surface in FIGS. 1A, 3A, and 4A).
Unlike the base 51 provided with the other ink jet coating apparatuses 21 and 23, the base 51A provided with the ink jet coating apparatus 22 for surface edge coating described later is a plate for inclining the plate-shaped building material 10. A shape building material inclination angle varying means 40 is provided (see FIG. 1).

The plate-shaped building material inclination angle varying means 40 is provided on the base 51A, and is driven to move up and down in the vertical direction (white arrow Z direction), and the lift arm 42 that slides in the left and right direction (white arrow X direction). It has the inclination base 41 by which the plate-shaped building material 10 which inclines by the raising / lowering slide of the raising / lowering arm 42 and comprises a part of base 51A is mounted.
The inclined base 41 is rotatably supported by the base 51A with a rotation point 43 formed of a support shaft or the like as a support point, and is connected to the lifting arm 42 by a shaft 44.
Further, the inclined base 41 is provided with a conveyor belt 52A, and a protrusion 52Aa is formed on the conveyor belt 52A to prevent the plate-shaped building material 10 placed on the conveyor belt 52A from slipping down when inclined. . Moreover, this protrusion 52Aa also becomes a positioning at the time of coating the surface edge part 11a of each side of the plate-shaped building material 10.
The base 51 </ b> A is provided between the bases 51 on which a surface center coating inkjet coating device 21 and an end surface coating inkjet coating device 23, which will be described later, are respectively disposed, and the plate-shaped building material 10 is transported from the previous step. When it is done and when it is transported toward the next process, the inclined base 41 is placed in a horizontal state, so that the plate-shaped building material 10 is received from the previous process and transported toward the next process.

  In the present embodiment, the plate-shaped building material 10 is conveyed by the conveyor belts 52 and 52A to the respective inkjet coating apparatuses 21, 22, and 23 that are fixed, thereby the inkjet coating apparatuses 21, 22, and 22. 23, each of the ink ejection ports 21d, 22d, 23d and the plate-shaped building material 10 are relatively moved. The ink discharge ports 21d, 22d, and 23d may be moved.

The inkjet coating unit 20 is for coating each part of the plate-shaped building material 10 in each step described later, and an inkjet coating device 21 for coating the surface center part for coating the surface center part 11b of the plate-shaped building material 10; A surface edge coating inkjet coating device 22 for coating the surface edge 11a of the building material 10 and an end surface coating inkjet coating device 23 for coating the end surface 12 of the plate-shaped building material 10 are provided.
These inkjet coating apparatuses 21, 22, and 23 are arranged in the above order from the upstream side in the conveyance direction of the plate-shaped building material 10 conveyed by the conveyance belts 52 and 52A of the bases 51 and 51A.

As shown in FIG. 3, the inkjet coating apparatus 21 for coating the center of the surface includes an apparatus main body 21a disposed adjacent to the base 51, and a nozzle head arm 21b connected to the apparatus main body 21a and supporting the nozzle head 21c. Have.
The nozzle head arm 21b is supported by the support body 21e disposed opposite to the apparatus main body 21a with the base 51 interposed therebetween, and the apparatus main body 21a.
The nozzle head 21c is a so-called line-type nozzle head formed in a long direction in a direction orthogonal to the conveying direction of the plate-shaped building material 10 (width direction of the plate-shaped building material 10, left-right direction on the paper surface). An infinite number of ink ejection openings 21d that eject color ink droplets toward the surface center portion 11b (vertically downward) are formed.
The surface center portion inkjet coating device 21 is for coating the surface center portion 11b of the plate-like building material 10, and only the inner side of the surface 11 of the plate-like building material 10 is coated, for example, by about 5 mm. The remaining part is the surface edge 11a (in the example shown, the width of the surface edge 11a is W).
The nozzle head 21c of the inkjet coating apparatus 21 for coating the center of the surface may be a so-called serial type nozzle head that can be moved and scanned in the width direction of the plate-shaped building material 10 instead of the line type.

As shown in FIG. 4, the end face coating ink jet coating apparatus 23 includes two end face coating ink jet coating apparatuses 23 for coating the end face 12. Yes.
Each of the end face coating inkjet coating apparatuses 23 includes an apparatus main body 23a disposed adjacent to the base 51, and a nozzle head arm 23b connected to the apparatus main body 23a and supporting the nozzle head 23c.
Each nozzle head 23c forms an infinite number of ink discharge ports 23d that discharge ink droplets of various colors toward the end surface 12 (horizontal direction) on the surface facing the end surface 12, and the ink discharged from the ink discharge ports 23d. The discharge width is controlled to be substantially the same as the plate thickness of the plate-shaped building material 10.
In this way, by controlling the ink ejection width, it is possible to prevent the ejected ink droplets from adhering to the surface side of the plate-shaped building material 10 when the end surface 12 is painted.

The inkjet coating apparatus 22 for surface edge coating constitutes inkjet coating means for coating the surface edge 11a of the plate-shaped building material 10 used in the plate-shaped building material coating method according to the present embodiment.
As shown in FIG. 1, the surface edge coating ink jet coating apparatus 22 includes an apparatus main body 22a disposed adjacent to a base 51A, and a nozzle head arm 22b connected to the apparatus main body 22a to support the nozzle head 22c. have.
The nozzle head arm 22b is moved vertically with respect to the apparatus main body 22a in accordance with the inclination angle of the plate-shaped building material 10 inclined by the plate-shaped building material inclination angle varying means 40, the plate thickness of the plate-shaped building material 10 and the like ( It is configured to move up and down in the white arrow Z direction and to expand and contract in the left-right direction (white arrow X direction). In this way, the nozzle head 22c is moved up and down, and the nozzle head 22c is positioned so that the ink droplets discharged from the ink discharge port 22d are discharged toward the surface edge 11a.

The nozzle head 22c has innumerable ink discharge ports 22d on the back surface thereof for discharging ink droplets of various colors toward the surface edge portion 11a (vertically below).
The nozzle head 22c can change the size of the ink droplets to be ejected according to the inclination angle of the plate-shaped building material 10 inclined by the plate-shaped building material inclination angle variable means 40 described above, and the ink discharge port The discharge width can be changed by controlling 22d.
The inkjet coating device 22 for surface edge coating is for coating the surface edge 11a of the plate-like building material 10, and is applied from the peripheral edge left unpainted by the above-described inkjet coating device 21 for surface center coating. The remaining margin, that is, the surface edge portion 11a other than the surface center portion 11b is painted.
In addition, in the example of a figure, the state which coats the surface edge part 11a of the one side 13 of the plate-shaped building material 10 is shown, and the coating of the surface edge 11a of the other sides 14, 15, 16 has not been made yet. Indicates the state.

The control unit 30 includes a CPU 31 that constitutes a control means for controlling the above-described units, an operation means 32 for performing various operations, a storage means 33 for storing a control program, pattern data of a pattern to be painted, and the like.
In each figure, reference numeral 34 denotes a signal line that connects each unit and the control unit 30.

The ink jet nozzle driving method for discharging ink droplets from the ink discharge ports 21d, 22d, and 23d of each of the ink jet coating apparatuses 21, 22, and 23 is not particularly limited, and a known one can be selected as appropriate. Yes, any one of a drop-on-demand piezo method, a drop-on-demand valve method, a continuous charging deflection method, and the like can be applied.
Further, the ink to be ejected is, for example, a solution in which a pigment constituting a basic color is mixed with a resin, a solvent, a curing agent, an additive, and the like, and ink reception formed on the nozzle driving method and the plate-shaped building material 10 described above. A known industrial inkjet ink can be applied depending on the layer or the like. For example, a fast-drying ink that uses methyl ethyl ketone, ethanol, acetone, or the like as a solvent, an oil-based oil-based ink, a UV curable ink that is cured by irradiation with ultraviolet rays, a water-based ink, or the like may have at least weather resistance and water resistance. preferable.

Furthermore, when the white ink-receiving layer is formed by pretreatment as in this embodiment, color inks such as black, yellow, magenta, and cyan are applied, but the colors of the ink-receiving layers are different. In the case of a substrate that does not need to form an ink receiving layer, an appropriate color ink can be selected according to the color of the ink receiving layer and the surface color of the substrate.
Moreover, the structure of the plate-shaped building material inclination angle variable means 40 which comprises a plate-shaped building material inclination means is not restricted to an above-described structure, What kind of thing may be used as long as the plate-shaped building material 10 is inclined.

  Next, the process of coating the plate-shaped building material 10 using the plate-shaped building material coating apparatus A configured as described above will be described.

<Surface center coating process>
As shown in FIG. 3, the plate-shaped building material conveying means 50 is operated so that the plate-shaped building material 10 placed on the conveying belt 52 is directed below the nozzle head 21 c of the inkjet coating apparatus 21 for coating the surface center portion. Transport.
When it is detected that the transported plate-shaped building material 10 has arrived at a predetermined position, ink droplets are ejected from the ink discharge ports 21d based on the pattern data stored in the storage means 33, and the transported plate-shaped building material 10 On the other hand, the surface center portion 11b is coated by the nozzle head 21c scanning the surface center portion 11b.
At this time, the predetermined position may be detected by an optical sensor or the like.
The plate-shaped building material 10 coated with the surface center portion 11 b is conveyed by the conveyance belt 52 toward the next process.
In this surface center portion painting step, as described above, only the inner side, for example, about 5 mm from the periphery of the surface 11 of the plate-like building material 10 is painted, so that the ink droplets ejected from the ink ejection port 21d are in the outer surface area. It will not scatter or float.
Note that the unpainted margin from the periphery depends on the distance between the ink discharge port 21d and the surface 11 of the plate-shaped building material 10 or the like, and the ink droplets discharged from the ink discharge port 21d are scattered or floated on the outer surface. You may set so that it may not fall.

<Surface edge painting process>
As described above, the plate-shaped building material 10 coated on the surface center portion 11b reaches the surface edge portion painting step.
This surface edge coating process constitutes the plate-shaped building material coating method according to the present embodiment, and as shown in FIG. 1, the plate-shaped building material 10 placed on the conveyor belt 52A is an inkjet for surface edge coating. The surface edge 11a is painted by the coating device 22.
When it is detected that the transported plate-shaped building material 10 has arrived at a predetermined position, the plate-shaped building material inclination angle varying means 40 is operated so that one side 13 of the plate-shaped building material 10 faces the one side 13 downward. The plate-shaped building material 10 is inclined so that the other side 14 is upward. In this state, the end surface 12 of the one side 13 is inclined downward.
In the present embodiment, the plate-shaped building material 10 is inclined so as to have a predetermined inclination angle θa. At this time, the nozzle head arm 22b is moved up and down in advance according to the inclination angle θa, the plate thickness of the plate-shaped building material 10 and the like, and ink droplets discharged from the ink discharge port 22d are discharged toward the surface edge portion 11a. The nozzle head 22c is moved to a predetermined position.

  The predetermined inclination angle θa is a vertical line in the plate-shaped building material 10 in which chamfering or the like is not formed at the edge as in the present embodiment, and the angle between the surface 11 and the end surface 12 is substantially a right angle. And the end face 12 may be made to have an acute angle, that is, larger than 0 degree and smaller than 90 degrees. Preferably, by setting the angle to 15 degrees or more and 75 degrees or less, it is possible to reduce the adhesion of the ink droplets to the end surface 12 without impairing the quality of the pattern formed by the ink droplets ejected to the surface edge portion 11a.

Further, when it is detected that the conveyed plate-shaped building material 10 has arrived at a predetermined position, and the plate-shaped building material 10 is inclined at a predetermined inclination angle θa as described above, the pattern data stored in the storage means 33 is stored in the pattern data. Based on this, ink droplets are ejected vertically downward from the ink ejection port 22d, and the nozzle head 22c scans the surface edge 11a along the one side 13 with respect to the plate-shaped building material 10 to be conveyed. The surface edge portion 11a of the one side 13 of the plate-shaped building material 10 is painted.
Since the coating of the surface edge portion 11a is performed by ink-jet coating based on the same pattern data as when the surface center portion 11b is coated, by controlling the discharge of the nozzle head 22c, the surface center portion coating step is performed. It is made with high accuracy without impairing the continuity of the pattern with the painted surface center portion 11b and without overcoating.

When the ink droplets are ejected to the surface edge portion 11a, the size of the ink droplets ejected from the ink ejection port 22d may be changed according to the inclination angle θa of the plate-shaped building material 10.
In other words, depending on the dot diameter formed by landing of ink droplets and the degree of dot-to-dot overlap, if the ink is ejected onto the inclined surface edge 11a, as is the case with the dot spacing of the surface central portion 11b. The distance between the dots when landing is increased by the amount of inclination. Therefore, the dot diameter at the time of landing is adjusted by adjusting the size of the ink droplet ejected to the surface edge portion 11a to be larger than the ink droplet ejected to the surface center portion 11b according to the inclination angle θa. Becomes larger and can absorb the dot interval spread as described above.
Such adjustment of the size of the ink droplet to be ejected can be achieved by increasing the voltage applied to the nozzle head 22c, increasing the valve opening time, or increasing the ON time in the valve-type or piezo-type nozzle head 22c. This is possible.

After coating the surface edge 11a of the one side 13, the plate-shaped building material 10 is rotated 90 ° by a rotating means or the like, and the surface edges 11a of the other sides 15, 14, 16 are sequentially coated. Similarly to the above, the plate-shaped building material 10 is tilted.
If the surface edge 11a of one side 13 is painted along the longitudinal direction (up and down direction on the paper surface), the surface edge 11a at the corner with the other side 15 is already painted. When the side 15 is painted, it may be controlled so as not to be discharged to the surface edge 11a of the already painted portion. The same applies to the other sides 14 and 16. Since such control is also performed by inkjet coating, it can be performed with high accuracy.

  As described above, in the present embodiment, the plate-shaped building material 10 is inclined by the plate-shaped building material inclination angle varying means 40, and the end surfaces 12 of the side sides 13, 14, 15, 16 are directed obliquely downward, Ink droplets are ejected toward the surface edge portion 11a of each of the side edges 13, 14, 15, and 16. Therefore, as described above, the ink droplet that floats and falls on the outer surface of the plate-shaped building material 10 has a mist-like shape, and the end surface 12 of each side 13, 13, 15, 16 is inclined obliquely downward. The droplets fall downward due to their own weight without adhering to the end face 12 of each of the side edges 13, 14, 15 and 16 or entering around. As a result, after coating the surface center portion 11b and the surface edge portion 11a of the plate-shaped building material 10, in the next step, when the end surface 12 is painted, the end surface 12 becomes double-coated and darker than the surface 11 It can be reduced that the pattern quality of the end face 12 is deteriorated. Therefore, the plate-shaped building material 10 with high designability can be provided.

<End face painting process>
The plate-shaped building material 10 coated on the surface 11 as described above reaches the end surface coating step, and as shown in FIG. 4, the plate-shaped building material 10 placed on the conveyor belt 52 is ink-jet painted for end surface coating. The end face 12 is painted by the device 23.
When it is detected that the transported plate-shaped building material 10 has arrived at a predetermined position, ink droplets are ejected from the ink discharge ports 23d based on the pattern data stored in the storage means 33, and the transported plate-shaped building material 10 On the other hand, the nozzle head 23 c scans along the end surface 12, thereby coating the end surfaces 12 of the opposing side edges 13 and 14 of the plate-shaped building material 10.
In the present embodiment, as described above, the end faces 12 of the side edges 13 and 14 of the plate-shaped building material 10 are simultaneously coated by the end face coating ink jet coating apparatus 23 arranged on both sides of the base 51. Then, the plate-shaped building material 10 is rotated by 90 ° by a rotating means or the like, and the end faces 12 of the other opposing side edges 15 and 16 are coated.

In the present embodiment, the coating of the end face 12 is configured to coat the opposing end faces 12 and 12 at the same time as described above. The end face 12 on each side may be sequentially coated by the end face coating inkjet coating apparatus 23.
Further, the order of the above steps is not limited to the order described above, and after the end surface 12 is painted, the surface center portion 11b and the surface edge portion 11a may be painted in this order or in the reverse order.
Furthermore, after passing through the above three steps, a protective layer is formed by further attaching a transparent protective sheet or film so as not to disturb the applied pattern, or a transparent resin paint (for example, A protective coating film may be formed by painting urethane, epoxy, or the like.
Furthermore, in this embodiment, although the coating process of the surface center part 11b, the surface edge part 11a, and the end surface 12 of the plate-shaped building material 10 is performed by the plate-shaped building material coating apparatus A is illustrated, The building material coating apparatus A may be configured to execute at least the surface edge coating process. That is, you may make it perform a surface center part coating process and an end surface coating process with another apparatus.

Next, another embodiment according to the present invention will be described with reference to the drawings.
FIG. 5 is an explanatory diagram for explaining the plate-shaped building material coating method according to the second embodiment, and is a schematic longitudinal sectional view corresponding to FIG.
The difference from the first embodiment is mainly the configuration of the plate-shaped building material and the configuration of the nozzle head. The same components are denoted by the same reference numerals and the description thereof is omitted.

In the plate-shaped building material 10A to be painted in the present embodiment, a chamfered inclined surface 12a is formed over the entire upper side of the side surfaces 13 and 14 along each side, and a vertical surface 12b is formed below the chamfered inclined surface 12a. ing. The chamfered inclined surface 12a is not formed on the end surfaces of the other side edges 15 and 16 (similar to FIG. 1).
Further, the nozzle head 22cA is smaller than the dot interval when the ink droplets ejected from the nozzle head 21c for coating the surface center portion 11b are landed according to the inclination angle of the plate-shaped building material 10A. In addition, the ejection of ink droplets from the ink ejection port 22dA is controlled, and as a result, the spread of the dot interval due to the inclination is absorbed as described above.

Moreover, in this embodiment, according to the formation angle of the chamfered inclined surface 12a, that is, the angle θd formed between the chamfered inclined surface 12a and the surface 11, the inclined angle θc of the plate-shaped building material 10A by the plate-shaped building material inclination angle varying means 40. To change.
At this time, the angle θb formed between the chamfered inclined surface 12a and the vertical line is set to an acute angle as in the first embodiment, so that the chamfered inclined surface 12a is inclined downward, and in this state, the ink discharge By ejecting ink droplets from the outlet 22dA, it is possible to reduce adhesion of the ink droplets ejected toward the surface edge portion 11a to the end surface 12A as described above.

Also in the present embodiment, like the first embodiment, after the surface center portion 11b is coated, the surface edge portion 11a of the side edge 13 is coated as described above, and then the other side edges 15, The surface edges 11a of 14 and 16 are painted. At this time, since the chamfered inclined surface 12a is not formed on the other sides 15 and 16, the inclination angle θc of the plate-shaped building material 10A may be reduced.
Furthermore, after coating the surface edge portion 11a, the end surfaces 12A of the side sides 13, 14, 15, 16 are painted as in the first embodiment.

Next, still another embodiment according to the present invention will be described with reference to the drawings.
FIG. 6 is an explanatory diagram for explaining the plate-shaped building material coating method according to the third embodiment, and is a schematic longitudinal sectional view corresponding to FIG.
Note that the difference from the first embodiment is mainly the configuration of the plate-shaped building material, and the same components are denoted by the same reference numerals and the description thereof is omitted.

In the plate-shaped building material 10B to be coated in the present embodiment, a chamfered convex curved surface 12c is formed on the entire upper side of the end surface 12B of the side sides 13 and 14 along each side side, and a vertical surface 12d is formed below the chamfered convex curved surface 12d. Is formed. The chamfered convex curved surface 12c is not formed on the end surfaces of the other side edges 15 and 16 (similar to FIG. 1).
Thus, when the convex curved surface 12c is formed in the upper part of the end surface 12B, the angle θf formed by the surface 11 and the vertical line in a state where the plate-shaped building material 10B is inclined is specified to be 15 degrees or more and 75 degrees or less. In this state, the convex curved surface 12c positioned on the vertical surface 12d side from the point 12e on the convex curved surface where the vertical line is tangent is defined as the end surface 12B including the vertical surface 12d. That is, a set of points 12e on the convex curved surface is defined as a boundary line between the surface 11 and the end surface 12B, and a portion having a width W on the surface 11 side from the boundary line becomes the surface edge 11a.
Further, the plate-shaped building material 10B is inclined so as to have a predetermined inclination angle θe in accordance with the angle θf.
By defining the end surface 12B in this way, the end surface 12B including the convex curved surface 12c located on the vertical surface 12d side from the point 12e on the convex curved surface is in an obliquely downward state, and in this state, the ink discharge port 22d. By ejecting ink droplets from the ink droplets, it is possible to reduce the adhesion of the ink droplets ejected toward the surface edge portion 11a to the end surface 12B as described above.
In this embodiment, the ejection width of the ink droplets ejected from the ink ejection port 22d of the nozzle head 22c and the size of the ink droplets are changed according to the inclination angle θe.

Also in the present embodiment, like the first embodiment, after the surface center portion 11b is coated, the surface edge portion 11a of the side edge 13 is coated as described above, and then the other side edges 15, The surface edges 11a of 14 and 16 are painted. At this time, since the chamfered convex curved surface 12c is not formed on the other side edges 15 and 16, the inclination angle θe of the plate-shaped building material 10B may be reduced.
Furthermore, after coating the surface edge portion 11a, the end surfaces 12B of the side sides 13, 14, 15, and 16 are painted as in the first embodiment.
The plate-shaped building materials 10, 10 </ b> A, and 10 </ b> B to be painted in the above embodiments are exemplified by those having a smooth surface 11, but are also painted on the surface 11 having an uneven shape. Is possible.

It is explanatory drawing for demonstrating one Embodiment of the plate-shaped building material coating method which concerns on this invention, (a) is a schematic plan view, (b) is a schematic longitudinal cross-sectional view. It is a block diagram which shows an example of the plate-shaped building material coating apparatus which performs the plate-shaped building material coating method which concerns on the same embodiment. It is explanatory drawing for demonstrating the process of coating the surface center part of a plate-shaped building material with the plate-shaped building material coating apparatus, (a) is a schematic plan view, (b) is a schematic longitudinal cross-sectional view. It is explanatory drawing for demonstrating the process of coating the end surface of a plate-shaped building material with the plate-shaped building material coating apparatus, (a) is a schematic plan view, (b) is a schematic longitudinal cross-sectional view. It is explanatory drawing for demonstrating other embodiment of the plate-shaped building material coating method which concerns on this invention, and is a figure corresponding to FIG.1 (b). It is explanatory drawing for demonstrating other embodiment of the plate-shaped building material coating method which concerns on this invention, and is a figure corresponding to FIG.1 (b).

Explanation of symbols

10, 10A, 10B Plate-shaped building material 11 Surface 11a Surface edge portion 12, 12A, 12B End surface 12a Chamfered inclined surface 13, 14, 15, 16 Side 22 Inkjet coating device for surface edge coating (inkjet coating means)
22d, 22dA ink outlet

Claims (2)

It is a plate-like building material coating method in which ink droplets are discharged vertically downward from an ink discharge port of an inkjet coating means, and a surface edge portion of a plate-like building material made into a substantially rectangular shape in plan view is painted,
In the state where the one side of the plate-shaped building material is downward and the plate-shaped building material is inclined so that the other side facing the one side is upward and the end surface of the one side is directed obliquely downward, Ink droplets are ejected from the ink ejection port toward the surface edge of the one side while relatively moving the ink ejection port and the plate-shaped building material along the one side, and the surface edge is coated. A method for painting a plate-shaped building material. In claim 1,
A plate-shaped building material coating method, wherein a chamfered inclined surface is further formed at the upper end of the one side edge along the one side edge.

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