JP5858525B2 - Architectural board and inkjet coating equipment - Google Patents

Description

  The present invention relates to a building board on which inkjet coating is applied, and an inkjet coating apparatus used for manufacturing the building board.

  In recent years, in order to improve the design of a wall structure in a building, an ink jet coating is applied to a building board constituting the wall structure.

  However, when ink-jet coating is adopted, a very beautiful design pattern can be easily formed. On the other hand, if an uncoated part is exposed in the wall structure, the part becomes very conspicuous and vice versa. In some cases, the designability may be deteriorated.

  For example, when two building boards are connected by fitting each other in the wall structure, if a misalignment occurs between the building boards in this fitting part, the part where the inkjet coating is not applied on the end face of the building board May be exposed to the outside, which may reduce the design of the wall structure.

  Therefore, in Patent Document 1, for example, a convex part of a decorative building board formed by providing a convex part at one end and a receiving part at the other end is engaged with a receiving part of another decorative building board. It is disclosed that the portion exposed to the outside of the engaging portion between the portion and the receiving portion is painted in the same manner as the surface of the decorative building board. Thereby, even if position shift arises in the engaging part of a convex part and a receiving part, the part to which the coating is given will be exposed to the exterior of a wall structure.

JP 2007-198098 A

  However, when ink-jet coating is applied to the end face of the building board in this way, when this end face is exposed to the outside of the wall structure, the design pattern of the exposed portion may be conspicuous. In addition, when inkjet coating is applied to the end face of a building board, there is also a problem that an increase in resource consumption is caused.

  The present invention has been made in view of the above-mentioned reasons, and the object of the present invention is to cause misalignment or the like when two building boards that have been subjected to inkjet coating are connected by being fitted to each other in the wall structure. Provided is a building board that can hardly deteriorate the appearance even if the end face of the building board is exposed to the outside, and can suppress an increase in resource consumption, and an ink jet coating apparatus that is suitably used to obtain this building board. There is to do.

The building board according to the present invention is a building board used for constituting a wall structure, and obtained by applying inkjet coating to a base material,
Inkjet coating is applied to the first surface in the thickness direction of the substrate,
The first end of the base material in the direction parallel to the first surface and the second end formed on the opposite side of the first end are formed into shapes that can be fitted to each other,
On the first end, a second surface is formed which faces the first surface and intersects the first surface, and the second surface is subjected to inkjet coating having a lower resolution than the first surface. ing.

A first aspect of an inkjet coating apparatus according to the present invention is an inkjet coating apparatus used for manufacturing a building board by applying inkjet coating to a substrate,
The first surface in the thickness direction of the base material faces upward, and the first end portion in a direction parallel to the first surface of the base material is formed on the side opposite to the first end portion. A transporting means capable of transporting the base material in a state where the two ends are aligned in a direction intersecting the transport direction of the base material;
First coating means for ejecting ink droplets from above the transport path of the substrate by the transport means toward the first surface;
From the side of the transport path toward the second surface, which faces the first surface of the base material and intersects the first surface, the ink liquid with a lower resolution than the first coating means. Second coating means for spraying drops.

A second aspect of the inkjet coating apparatus according to the present invention is an inkjet coating apparatus used for manufacturing a building board by applying inkjet coating to a substrate,
It is arranged so that the first surface in the thickness direction of the base material faces upward, and is formed on the side opposite to the first end portion in the direction parallel to the first surface of the base material. A transporting means capable of transporting the base material such that the second end portion is aligned in a direction intersecting the transport direction of the base material;
First coating means for ejecting ink droplets from above the transport path of the substrate by the transport means toward the first surface;
From above the transport path, ink droplets are directed to a position that faces the first surface of the substrate and protrudes outside the substrate from a second surface that is a surface intersecting the first surface. A third coating means to spray;
By generating an air flow from the side of the transport path toward the first end, droplets ejected from the third coating unit are transferred to the second surface at a lower resolution than the first coating unit. An airflow generating means for spraying.

  According to the present invention, when two building boards are connected by fitting each other in the wall structure, even if the end of the building board is exposed to the outside due to misalignment or the like, the appearance is hardly deteriorated, Increase in resource consumption during building board production is suppressed.

It is a perspective view which shows the building board in one Embodiment of this invention. It is a side view which shows the fitting structure of building boards in one Embodiment of this invention. It is a side view which shows the outline of the 1st aspect of an inkjet coating apparatus. It is a top view which shows the outline of the 1st aspect of an inkjet coating apparatus. It is a side view which shows the outline of the 2nd aspect of an inkjet coating apparatus. It is a top view which shows the outline of the 2nd aspect of an inkjet coating device. It is a partial front view which shows the outline of the 2nd aspect of an inkjet coating device.

  An example of the building board 1 according to the present embodiment is shown in FIGS. 1 and 2. This building board 1 is used to configure a wall structure. The wall structure of a building is comprised by combining the some building board 1 and installing. The building board 1 is obtained by subjecting the base material 2 to inkjet coating.

  An end (first end 3) in a direction parallel to the first surface 5 in the thickness direction of the substrate 2 and an end (second end 4) formed on the side opposite to the first end 3 ) Is formed in a shape that can be fitted to each other. In addition, the 1st surface 5 is a surface exposed outside in the wall structure comprised from the building board 1. FIG. In the wall structure composed of a plurality of building boards 1, the building board 1 is installed such that the first end 3 is disposed above and the second end 4 is disposed below. The two building boards 1 that are adjacent to each other in the wall structure are connected by fitting the first end 3 of the lower building board 1 and the second end 4 of the upper building board 1 together.

  The shape of the 1st end part 3 and the shape of the 2nd end part 4 are formed in the shape which can be fitted, for example by a decision (aijakuri). In the present embodiment, the first end portion 3 has the first convex portion 7, and the second end portion 4 has the second convex portion 8, thereby the first end portion 3 and the first convex portion 7. It has a shape that can be fitted to the two end portions 4 by agreement. The first convex portion 7 protrudes outward of the substrate 2 from a position deflected to the opposite side of the first surface 5 at the first end portion 3. The second protrusion 8 protrudes outward from the base 2 from the position deflected to the first surface 5 at the second end 4. By forming the first convex portion 7 and the second convex portion 8 as described above, it is possible to connect the building board 1 in the vertical direction. The shape of the first end 3 and the shape of the second end 4 are not particularly limited as long as they can be fitted to each other. For example, one of the first end 3 and the second end 4 The first end 3 and the second end 4 are formed in various shapes, such as a male is formed with a female on the other side, and the first end 3 and the second end are formed. 4 may be in a shape that can be fitted to each other.

  In the present specification, a surface that faces the first surface 5 and intersects the first surface 5 in the first end portion 3 of the substrate 2 is defined as a second surface 6. The second surface 6 is abutted against the second end 4 when the first end 3 and the second end 4 are fitted. In this embodiment, the surface which exists between the 1st convex part 7 and the 1st surface 5 in the 1st end part 3 is the 2nd surface 6, and this 2nd surface 6 is the 1st end part 3. And the second end portion 4 are abutted against the second convex portion 8 of the second end portion 4.

  When two building boards 1 (101, 102) are connected vertically by fitting the first end 3 of the lower building board 101 and the second end 4 of the upper building board 102 together. It is preferable that a part of the second surface 6 is exposed to the outside on the first surface 5 side. That is, it is preferable that the first end portion 3 and the second end portion 4 are formed in a shape in which a part of the second surface 6 is exposed to the outside on the first surface 5 side when both are fitted. For example, in this embodiment, as shown in FIG. 2, the thickness direction dimension of the 2nd surface 6 is larger than the thickness direction dimension of the 2nd convex part 8, For this reason, the 1st end part 3 and the 2nd end part 4 It is preferable that a part of the second surface 6 protrudes from the second convex portion 8 and is exposed to the outside on the first surface 5 side. In this case, the lower first end 3 protrudes outside the upper second end 4 at the fitting portion between the first end 3 and the second end 4. For this reason, even if sunlight is irradiated obliquely from above the wall structure, the shadow caused by the step between the building boards 1 does not occur in the upper and lower butted portions of the two building boards 1. The appearance of the structure is improved. On the other hand, when the second end 4 on the upper side of the lower first end 3 protrudes outward, a shadow due to the step between the building boards 1 is generated by sunlight. Further, even if the first end portion 3 and the second end portion 4 are constructed so as to be flush with each other, a step is generated between the building boards 1 due to a dimensional error or an error at the time of construction, thereby causing a shadow. There is a fear.

  Inkjet coating is applied to at least the first surface 5 and the second surface 6 of the substrate 2. The second surface 6 is then subjected to ink jet coating at a lower resolution than the first surface 5. That is, the dot density of the ink by the ink jet coating on the second surface 6 is lower than the dot density of the ink by the ink jet coating on the first surface 5. In particular, the dot density of the ink by ink-jet coating on the second surface 6 is preferably in the range of 25% or more and less than 100% of the dot density of the ink by ink-jet coating on the first surface 5. Moreover, if consideration is given to further improving the design of the wall structure and further reducing resource consumption, the ratio of the dot density on the second surface 6 to the first surface 5 is in the range of 30 to 70%. Is preferred.

  When the wall structure is configured by such a building board 1, when the two building boards 1 are connected by fitting the first end 3 and the second end 4, Even if a part is exposed to the outside, a part of the second surface 6 becomes inconspicuous in appearance. That is, since the ink jet coating is applied to the second surface 6 together with the first surface 5, even if a part of the second surface 6 is exposed to the outside, the color of the base material 2 that is the base may appear in appearance. Disappear. In addition, when the resolution of the inkjet coating on the second surface 6 is the same as or higher than that of the first surface 5, a part of the second surface 6 may be conspicuous on the contrary by painting, If the resolution of the inkjet coating on the second surface 6 is lower than that of the first surface 5 as in the embodiment, a part of the second surface 6 is less noticeable in appearance. For this reason, the appearance of the wall structure is improved. In addition, the amount of ink applied to the second surface 6 is suppressed, so that it is possible to reduce resource consumption when the building board 1 is produced.

  The inkjet coating on the base material 2 may be further applied to positions other than the first surface 5 and the second surface 6. For example, inkjet coating may be applied to a portion of the first end portion 3 other than the second surface 6 that may be exposed to the outside in the wall structure due to misalignment or the like. In the present embodiment, the second end 4 may also be subjected to inkjet coating. When the second end 4 is subjected to inkjet coating, at least the third surface 20 is preferably subjected to inkjet coating, and the resolution of the inkjet coating on the third surface 20 is lower than that of the first surface 5. It is preferable. In the present specification, the surface of the second end 4 that faces the first surface 5 and intersects the first surface 5 is defined as a third surface 20. The end surface is the third surface 20. In this way, when the two building boards 1 are connected by fitting the first end 3 and the second end 4 together, even if a part of the third surface 20 is exposed to the outside, A part of the third surface 20 becomes inconspicuous in appearance.

  The detail of the base material 2 in this embodiment is demonstrated. The material of the base material 2 is not particularly limited. For example, a flexible board, a calcium silicate board, a gypsum slag perlite board, a wood cement board, a precast concrete board, an ALC board, an inorganic board such as a gypsum board, or a metal siding material such as a steel sheet siding material Etc. are used.

  A sealer and a receiving layer may be provided on the substrate 2. That is, prior to inkjet coating, an appropriate sealer may be applied on the substrate 2 and subsequently a receiving layer may be formed on the sealer. The receiving layer is preferably formed on at least the first surface 5 and the second surface 6 of the substrate 2. That is, it is preferable that the receiving layer is formed at a location on the base material 2 where inkjet coating is performed.

  The sealer is used for sealing the surface of the substrate 2. As the sealer, an appropriate composition such as a solvent system, an aqueous solution system or an emulsion system may be used. The resin system of the sealer is not particularly limited, and may be, for example, an acrylic system or a latex system.

  An acrylic or latex organic coating film may be formed on the sealer in the base material 2 in order to improve design and durability.

  The receiving layer has a function of fixing ink by inkjet coating on the substrate 2. The receiving layer is formed from, for example, a paint diluted with an organic solvent, a water-based paint, or the like.

  Examples of the water-based paint used for forming the receiving layer include an acrylic resin paint based on an acrylic emulsion, an acrylic silicon resin paint based on an acrylic silicon emulsion, and the like. The aqueous paint preferably contains at least one of an extender pigment and a hygroscopic resin. In this case, the fixability of the ink to the receiving layer is improved and the color developability is also improved. Examples of extender pigments include silica, alumina, aluminum hydroxide, barium sulfate, porous silica, and diatomaceous earth. Examples of the hygroscopic resin include ink-absorbing polymers such as vinyl acetate, urethane polymers, acrylic polymers, and polyvinyl alcohol. The water-based paint may contain a pigment such as titanium oxide, iron oxide, carbon black as a colorant.

When the receiving layer is formed from a water-based paint, for example, the water-based paint is formed by an appropriate method such as spray coating, curtain coating, dipping, wire bar coating, applicator coating, spin coating, roll coating, electrodeposition coating, brush coating, etc. Then, this water-based paint is heated to form a film, whereby a receiving layer is formed. The coating amount of the water-based paint on the base material 2 for forming the receiving layer is preferably in the range of 30 to 200 g / m ² · wet. The thickness of the receiving layer is not particularly limited, but is, for example, in the range of 5 to 45 μm.

  The detail of the inkjet coating with respect to the base material 2 in this embodiment is demonstrated. An inkjet apparatus used for inkjet coating has a configuration as shown in FIGS. 3 and 4, for example. The ink jet apparatus includes a conveying unit, a first coating unit, and a second coating unit. The conveying means is arranged so that the first surface 5 of the substrate 2 faces upward, and the first end portion 3 and the second end portion 4 are arranged in a direction intersecting the conveying direction of the substrate 2. It is comprised so that the base material 2 can be conveyed. The first coating unit is configured to eject ink droplets toward the first surface 5 from above the conveyance path of the substrate 2 by the conveyance unit. The second coating unit is configured to eject ink droplets from the side of the transport path toward the first end portion 3 of the substrate 2 at a lower resolution than the first coating unit.

  The conveying means is constituted by a conveyor or the like. In this aspect, the conveying means is constituted by a belt conveyor 12 including an infinite belt-like belt such as a timing belt and a pulley for suspending the belt. Of course, the conveying means is not limited to the belt conveyor 12. The conveying means is arranged so that the first surface 5 of the base material 2 faces upward, and the first end 3 and the second end 4 of the base material 2 intersect the transport direction of the base material 2. The substrate 2 can be transported in a state of being aligned in the direction, and for this purpose, the transport means is designed to have an appropriate shape and size.

  The first painting means includes a painting nozzle head 13 having an ejection nozzle 14, a paint supply tank 9 storing ink to be supplied to the ejection nozzle 14, a coating control system 10 that controls ejection of ink from the ejection nozzle 14, and the like. It is comprised from the inkjet type coating machine 11 provided with.

  The painting control system 10 includes various CPUs, ROMs, RAMs, and the like. The painting control system 10 includes a painting data creation unit, a painting control unit, an injection nozzle control unit, and the like. The painting data creation unit stores and saves the data of the color pattern created by scanning the original image. The color pattern is created such that a predetermined pattern is formed at a predetermined position on the substrate 2 by inkjet coating. The painting control unit has a function of fetching the color pattern data from the painting data creating unit and outputting a control signal to the spray nozzle control unit based on the color pattern data. The spray nozzle control unit has a function of controlling the spray nozzle 14 of the coating nozzle head 13 based on a control signal input from the coating control unit.

  The coating nozzle head 13 is disposed above the transport path of the substrate 2, and ink is ejected from the ejection nozzle 14 of the coating nozzle head 13 toward the first surface 5 of the substrate 2. The coating nozzle head 13 is provided at the lower end of the ink jet type coating machine 11 and is formed as a line head that is long in the direction intersecting the transport direction of the substrate 2. As the coating nozzle head 13, four types of coating nozzle heads 131, 132, 133, and 134 that eject ink of each color of yellow, cyan, magenta, and black are provided so as to be arranged along the conveyance direction of the substrate 2. It has been. The number of coating nozzle heads 13 is appropriately changed according to the type of ink used. A paint supply tank 9 (91, 92, 93, 94) is provided for each coating nozzle head 13 (131, 132, 133, 134).

  The ejection of each ejection nozzle 14 is controlled by, for example, a piezo control system or a control system for irradiating the photothermal exchange element with laser light. Under the control of the ejection nozzle control unit, the ejection and stop of the ink from each ejection nozzle 14 are individually controlled, and full color painting corresponding to the color pattern is performed.

  The second painting means includes a painting nozzle head 15 having the ejection nozzle 16, a paint supply tank in which ink to be supplied to the ejection nozzle 16 is stored, a painting control system that controls ejection of ink from the ejection nozzle 16, and the like. Consists of an ink jet coating machine.

  The painting control system includes various CPUs, ROMs, RAMs, and the like. The painting control system includes a painting data creation unit, a painting control unit, an injection nozzle control unit, and the like. The painting data creation unit stores and saves the data of the color pattern created by scanning the original image. The color pattern is created such that a predetermined pattern is formed at a predetermined position on the substrate 2 by inkjet coating. The painting control unit has a function of fetching the color pattern data from the painting data creating unit and outputting a control signal to the spray nozzle control unit based on the color pattern data. The spray nozzle control unit has a function of controlling the spray nozzle 16 of the coating nozzle head 15 based on a control signal input from the coating control unit.

  In this aspect, the paint supply tank 9 and the paint control system 10 in the first painting means may also serve as the paint supply tank and the paint control system in the second painting means, respectively.

  The coating nozzle head 15 is disposed at a position where ink droplets can be ejected toward the first end 3 of the substrate 2 on the side of the transport path of the substrate 2. More specifically, the coating nozzle head 15 is disposed at a position where ink droplets can be ejected from the coating nozzle head 15 onto at least the second surface 6 of the first end 3. 3 and 4, the coating nozzle head 15 in the second coating unit is disposed downstream of the coating nozzle head 13 in the first coating unit in the conveyance direction of the substrate 2. As the coating nozzle head 15, four types of coating nozzle heads 151, 152, 153, and 154 that eject ink of each color of yellow, cyan, magenta, and black are provided so as to be arranged along the conveyance direction of the substrate 2. It has been. Note that the position of the coating nozzle head 15 in the second coating means is not limited to this, and may be, for example, upstream of the coating nozzle head 13 in the first coating means in the transport direction of the substrate 2, The position which overlaps with the conveyance direction of the coating nozzle head 13 and the base material 2 in a 1st coating means may be sufficient.

  The second painting means performs inkjet painting at a lower resolution than the first painting means. That is, the second coating means is configured such that the ink dot density in the design pattern formed on the second surface 6 by the second coating means is lower than the ink dot density on the first surface 5. The For this purpose, for example, the density of the spray nozzles 16 in the second coating means is preferably lower than the density of the spray nozzles 14 in the first coating means. The density of the ejection nozzles 14 in the first painting means is set as appropriate according to the desired ink dot density on the first surface 5, and the density of the ejection nozzles 14 in the second painting means is on the second surface 6. It is set appropriately according to the dot density of the desired ink.

  The method for reducing the resolution by the second painting means is not limited to the above. For example, the type of ink ejected from the second painting means is selected from the type of ink ejected from the first painting means, and the number of types of ink ejected from the second painting means is set to the first type. It may be less than the number of types of ink ejected from the painting means. That is, for example, when the first painting unit ejects four types of inks of yellow, cyan, magenta, and black, the types of ink ejected from the second coating unit are four types of yellow, cyan, magenta, and black. It is good also as 1 type, 2 types, or 3 types chosen from a seed | species. In this case, compared with the design pattern formed by the first painting means, the design pattern formed by the second painting means thins out one or more colors of ink dots, and the dot density is correspondingly reduced. Will be reduced.

  When the inkjet coating apparatus according to this aspect is used, first, the base material 2 is supplied to the belt conveyor 12 when the base material 2 is coated. At this time, for example, the plurality of base materials 2 are sequentially conveyed at intervals by the belt conveyor 12. In the belt conveyor 12, the base material 2 is arranged so that the first surface 5 faces upward and the first end portion 3 and the second end portion 4 are aligned in a direction intersecting the transport direction of the base material 2. . Further, the first end 3 is disposed on the side where the coating nozzle head 15 is installed in the second coating means.

  When the base material 2 conveyed by the belt conveyor 12 passes below the coating nozzle head 13 in the first coating means, the coating nozzle head 13 faces the ink receiving layer on the first surface 5 of the base material 2. Ink is ejected by an ink jet method to perform ink jet painting.

  Moreover, when the base material 2 conveyed by the belt conveyor 12 passes the side of the coating nozzle head 13 in the second coating means, at least the second at the first end 3 of the base material 2 from the coating nozzle head 13. Ink is ejected toward the ink receiving layer on the surface 6 by an ink jet method, whereby ink jet painting is performed on the second surface 6 with a lower resolution than the first surface 5.

  In this manner, the inkjet coating apparatus applies inkjet coating to the first surface 5 of the substrate 2 and also applies inkjet coating to the second surface 6 of the substrate 2 at a lower resolution than the first surface 5. The

  Another embodiment of an ink jet device used for ink jet painting is shown in FIGS. The ink jet apparatus includes a transport unit, a first coating unit, a third coating unit, and an airflow generation unit. The conveying means is arranged so that the first surface 5 of the substrate 2 faces upward, and the first end portion 3 and the second end portion 4 are arranged in a direction intersecting the conveying direction of the substrate 2. It is comprised so that the base material 2 can be conveyed. The first coating unit is configured to eject ink droplets toward the first surface 5 from above the conveyance path of the substrate 2 by the conveyance unit. The third coating means is configured to eject ink droplets from above the transport path of the base material 2 toward a position that protrudes outside the base material 2 from the second surface 6. The air flow generation means generates an air flow from the side of the transport path toward the first end portion 3, thereby causing the ink droplets ejected by the third coating means to have a lower resolution than the first coating means. The first end 3 is configured to be sprayed.

  The conveying means is constituted by a conveyor or the like. For example, the belt conveyor 12 includes a belt conveyor including an infinite belt such as a timing belt and a pulley that suspends the belt. The conveying means is arranged so that the first surface 5 of the base material 2 faces upward, and the first end 3 and the second end 4 of the base material 2 intersect the transport direction of the base material 2. The substrate 2 can be transported in a state of being aligned in the direction, and for this purpose, the transport means is designed to have an appropriate shape and size.

  The first painting means includes a painting nozzle head 13 having an ejection nozzle 14, a paint supply tank 9 storing ink to be supplied to the ejection nozzle 14, a coating control system 10 that controls ejection of ink from the ejection nozzle 14, and the like. It is comprised from the inkjet type coating machine 11 provided with. These elements are configured in the same manner as in the embodiment shown in FIGS.

  The third painting means includes a painting nozzle head 17 having the ejection nozzle 19, a paint supply tank in which ink to be supplied to the ejection nozzle 19 is stored, a painting control system that controls ejection of ink from the ejection nozzle 19, and the like. Consists of an ink jet coating machine. In FIG. 5, the illustration of the coating nozzle head 17 having the spray nozzle 19 is omitted.

  The painting control system includes various CPUs, ROMs, RAMs, and the like. The painting control system includes a painting data creation unit, a painting control unit, an injection nozzle control unit, and the like. The painting data creation unit stores and saves the data of the color pattern created by scanning the original image. The color pattern is created such that a predetermined pattern is formed at a predetermined position on the substrate 2 by inkjet coating. The painting control unit has a function of fetching the color pattern data from the painting data creating unit and outputting a control signal to the spray nozzle control unit based on the color pattern data. The spray nozzle control unit has a function of controlling the spray nozzle 19 of the coating nozzle head 17 based on a control signal input from the coating control unit.

  In this aspect, the paint supply tank 9 and the paint control system 10 in the first painting means may also serve as the paint supply tank and the paint control system in the third paint means, respectively.

  The coating nozzle head 17 is disposed above the transport path of the base material 2. The coating nozzle head 17 is disposed at a position where ink droplets can be ejected toward a position that protrudes outside the base 2 from the second surface 6 of the base 2. As the coating nozzle head 17, four types of coating nozzle heads 171, 172, 173, and 174 that eject ink of each color of yellow, cyan, magenta, and black are provided so as to be arranged along the conveyance direction of the substrate 2. It has been.

  In this aspect, the painting nozzle head 17 in the third painting means is disposed on the side of the painting nozzle head 13 in the first painting means. That is, four types of coating nozzle heads 171, 172, 173, and 174 in the third coating unit are installed on the sides of the four types of coating nozzle heads 131, 132, 133, and 134 in the first coating unit, respectively. Yes. In this case, it becomes easy to paint the design pattern continuous with the design pattern by the first painting means by the third painting means. The position of the coating nozzle head in the second coating means is not limited to this. For example, it may be upstream of the coating nozzle head 13 in the first coating means in the transport direction of the substrate 2. The downstream side of the conveyance direction of the material 2 may be sufficient.

  The third painting means performs inkjet painting at a lower resolution than the first painting means. That is, the third coating unit is configured such that the ink dot density in the design pattern formed on the second surface 6 by the third coating unit is lower than the dot density of the ink on the first surface 5. The For this purpose, for example, the density of the spray nozzles 19 in the third coating means is preferably lower than the density of the spray nozzles 14 in the first coating means. The density of the ejection nozzles 14 in the first coating means is appropriately set according to the desired ink dot density on the first surface 5, and the density of the ejection nozzles 19 in the third painting means is the desired density on the second surface 6. It is set as appropriate according to the dot density of the ink. As a result, if inkjet coating is applied to the second surface 6 at a lower resolution than the first surface 5, the density of the spray nozzles 19 in the third coating means is equal to the spray nozzle in the first coating means. The density may not be lower than 14. For example, even if the density of the spray nozzles 19 in the third coating means is the same as or higher than the density of the spray nozzles 14 in the first coating means, the direction of the ink droplets by the airflow generation means as will be described As a result, if the second surface 6 is subjected to inkjet coating at a lower resolution than that of the first surface 5, that is acceptable.

  The method for reducing the resolution by the third painting means is not limited to the above. For example, the type of ink ejected from the third painting means is selected from the type of ink ejected from the first painting means, and the number of types of ink ejected from the third painting means is set to the first It may be less than the number of types of ink ejected from the painting means. That is, for example, when the first coating unit ejects four types of inks of yellow, cyan, magenta, and black, the types of ink ejected from the third coating unit are four types of yellow, cyan, magenta, and black. It is good also as 1 type, 2 types, or 3 types chosen from a seed | species. In this case, compared with the design pattern formed by the first painting means, the design pattern formed by the third painting means thins out one or more colors of ink dots, and the dot density is correspondingly reduced. Will be reduced.

  The airflow generation means is configured by an air machine (not shown) such as a blower and a nozzle 18 that discharges an airflow generated by the air machine. The nozzle 18 is arranged on the side of the base material 2 on the side of the first end 3 of the base material 2 that is transported along the transport path. More specifically, the nozzle 18 ejects an air flow toward the path of ink droplets ejected by the third coating means, and places the ink droplets on the second surface 6 of the substrate 2 in the air stream. It arrange | positions in the position which can be sprayed on (refer FIG. 7). In this embodiment, four nozzles 18 that eject an air flow toward each of the paths of ink droplets ejected from the four types of painting nozzle heads 17 (171, 172, 173, 174) in the third painting means. (181, 182, 183, 184) are installed.

  When the inkjet coating apparatus according to this aspect is used, first, the base material 2 is supplied to the belt conveyor 12 when the base material 2 is coated. At this time, for example, the plurality of base materials 2 are sequentially conveyed at intervals by the belt conveyor 12. In the belt conveyor 12, the base material 2 is arranged so that the first surface 5 faces upward and the first end portion 3 and the second end portion 4 are aligned in a direction intersecting the transport direction of the base material 2. . Furthermore, the first end 3 is disposed on the side where the second coating nozzle head is installed.

  When the base material 2 conveyed by the belt conveyor 12 passes below the coating nozzle head 13 in the first coating means, the coating nozzle head 13 faces the ink receiving layer on the first surface 5 of the base material 2. Ink is ejected by an ink jet method to perform ink jet painting.

  Further, as shown in FIG. 7, ink droplets are ejected from the coating nozzle head 17 in the third coating means toward the position protruding beyond the second surface 6 to the outside of the substrate 2 by an inkjet method. By ejecting an air flow by the air flow generating means toward the ink, ink droplets are sprayed onto the second surface 6 of the substrate 2 in the air flow. Thereby, inkjet coating is performed on the second surface 6 with a resolution lower than that of the first surface 5.

  In this manner, the inkjet coating apparatus applies inkjet coating to the first surface 5 of the substrate 2 and also applies inkjet coating to the second surface 6 of the substrate 2 at a lower resolution than the first surface 5. The

  The building board 1 may be provided with a clear layer. The clear layer is a transparent layer that covers the surface of the substrate 2 on which inkjet coating is applied. A clear layer is provided in the base material 2 after inkjet coating is performed. The clear layer is provided, for example, to protect the surface on which the inkjet coating is applied on the substrate 2.

  The clear layer is formed from, for example, a hydrophobic clear paint. Examples of the hydrophobic clear paint include acrylic paints and acrylic silicon paints containing a hydrophobic organic solvent such as butyl acetate and xylene as a solvent. Such a hydrophobic clear paint is applied by spraying or the like to the surface of the substrate 2 after inkjet coating, and then formed by baking and drying to form a clear layer. The thickness of the clear layer is not particularly limited, but is preferably in the range of 1 to 10 μm.

  Moreover, the building board 1 may be provided with an inorganic layer. The inorganic layer is a transparent layer mainly composed of an inorganic silicon compound such as a silicate compound. An inorganic layer is laminated | stacked and provided in the clear layer on the base material 2, for example. The inorganic layer is formed, for example, by applying an inorganic coating on the surface of the clear layer. The weather resistance of the building board 1 is improved by this inorganic layer. As the inorganic paint, an appropriate silicon alkoxide coating agent or the like can be used. Specific examples of inorganic coating materials include, for example, silicon alkoxide coating materials prepared by adding a condensation reaction catalyst such as polyorganosiloxane or alkyl titanate to a silica-dispersed oligomer solution of organosilane, or further adding silica. Is mentioned. After such an inorganic paint is applied by, for example, electrostatic coating, the film is baked and dried at 60 to 120 ° C. to form an inorganic layer. The thickness of this inorganic layer is not particularly limited, but is preferably in the range of 1 to 10 μm.

  The building board 1 may include a photocatalytic layer. The photocatalyst layer is a transparent layer containing a photocatalyst. The photocatalyst layer is provided by being laminated on an inorganic layer, for example. The photocatalyst layer is formed, for example, by coating an inorganic coating containing a photocatalyst on the surface of the inorganic layer. This photocatalyst layer improves the antifouling property of the building board 1. As the inorganic paint containing a photocatalyst, an appropriate one can be used. For example, a coating obtained by adding a photocatalyst such as titanium oxide to the above silicon alkoxide paint can be used. An inorganic paint containing such a photocatalyst is applied by, for example, spray coating, and then baked and dried at 60 to 120 ° C. to form a photocatalyst layer. The thickness of the photocatalyst layer is not particularly limited, but is preferably in the range of 0.2 to 1.0 μm.

DESCRIPTION OF SYMBOLS 1 Building board 2 Base material 3 1st end part 4 2nd end part 5 1st surface 6 2nd surface

Claims (3)

It is used to construct the wall structure, and is a building board obtained by applying inkjet coating to the base material,
Inkjet coating is applied to the first surface in the thickness direction of the substrate,
First end and a second end provided on both sides of said substrate, is formed in a shape capable of fitting to each other,
On the first end, a second surface is formed which faces the first surface and intersects the first surface, and the second surface is subjected to inkjet coating having a lower resolution than the first surface. Building board. An inkjet coating apparatus used for manufacturing a building board by applying inkjet coating to a substrate,
First surface in the thickness direction is oriented upward in the substrate, and first and second ends provided on both sides of the substrate, in a state aligned in a direction intersecting the transport direction of the base material Conveying means capable of conveying the substrate;
First coating means for ejecting ink droplets from above the transport path of the substrate by the transport means toward the first surface;
From the side of the transport path, it faces the first surface at the first end of the base material and is lower than the first coating means toward the second surface composed of the surface intersecting the first surface. An inkjet coating apparatus comprising: a second coating unit that ejects ink droplets at a resolution. An inkjet coating apparatus used for manufacturing a building board by applying inkjet coating to a substrate,
Direction the first surface in the thickness direction in the substrate is arranged to face upward, and first and second ends provided on both sides of the substrate, intersecting the transport direction of the base material A transporting means capable of transporting the base material,
First coating means for ejecting ink droplets from above the transport path of the substrate by the transport means toward the first surface;
From above the transport path, facing the first surface at the first end of the base material and toward a position that protrudes outside the base material from a second surface that is a surface intersecting the first surface. A third painting means for ejecting ink droplets;
By generating an air flow from the side of the transport path toward the first end, droplets ejected from the third coating unit are transferred to the second surface at a lower resolution than the first coating unit. An ink jet coating apparatus comprising an airflow generating means for spraying.

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