JP2007313392A - Ink-jet coating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink-jet coating method capable of drastically reducing occurrence of positional displacement between a joint of a base material and ink-jet coating due to a dimensional error, when applying ink-jet coating to the base material 1 having the joint. <P>SOLUTION: This invention relates to the ink-jet coating method coating colored patterns on the surface of the base material 1 having the joint 2 by the ink-jet coating. Joint intervals P in the base material 1 are measured before ink-jet coating. A colored pattern having a joint interval P nearest to the measured value is selected among multiple color patterns with different measured values of the joint intervals P. The selected colored pattern is coated on the base material 1 by the ink-jet coating. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an inkjet coating method for performing inkjet coating on a cement-based substrate on which joints are formed.

  Cement-based decorative boards are widely used for building exterior materials such as outer wall materials, roofing materials, and roofing materials. Since such a decorative sheet is responsible for forming the exterior of a building, technical studies have been made on surface decoration that realizes various designs. For example, a wet sheet obtained by molding a cement-based molding material by papermaking, extrusion molding, cast molding or the like is cured and cured, and the resulting inorganic board is generally coated.

  As a method of painting, recently, an ink-jet coating in which paint is jetted from an ink-jet nozzle head in synchronism with the transport speed of the inorganic plate toward the surface of the inorganic plate transported on a conveyor has been considered. Such ink-jet coating enables local and position-controlled coating as compared with a coating roll or the like that has been generally used so far. Therefore, there is an advantage that a decorative board coated with a high design with a natural texture can be manufactured by expressing dark and light (see Patent Document 1).

By such ink-jet coating, for example, with respect to the base material on which the joints are formed, the portions where the joints are formed are not applied, or the joints are formed and the joints are not formed. You can obtain a brick-like or tile-like decorative board by painting a different color.
JP 2004-17007 A

  When inkjet coating is applied to each of a plurality of base materials with joints formed as described above, the processing accuracy during joint formation and the dimensional changes during curing and drying when preparing a cement-based base material It is unavoidable that a slight variation occurs in the distance between joints for each of a plurality of base materials due to variations and the like. For this reason, in order to reduce the frequency of occurrence of the coating position deviation, the standard value of joint spacing formed on the base material in advance is set, and the base material is produced with the goal that the joint spacing becomes the standard value, When ink-jet coating is performed, a color pattern based on the standard value is applied to the substrate.

  However, dimensional accuracy and dimensional changes during curing are caused by subtle changes in the environment in which the substrate is produced, and changes in dimensional errors in joint spacing tend to correspond to the changes in the environment. For this reason, the dimensional error of the joint spacing may be stabilized in the vicinity of a value different from the standard value. Even in such a case, if the coating of the base material is uniformly performed based on the above-mentioned standard value, a state in which the same degree of displacement occurs between the joint position of the base material and the ink jet coating will continue.

  The present invention has been made in view of the above points, and when applying ink jet coating to a base material having joints, occurrence of misalignment between the base material joint and the ink jet coating due to the dimensional error of the base material. An object of the present invention is to provide an ink jet coating method capable of reducing the above.

  The invention according to claim 1 is an ink jet coating method in which a color pattern is applied to the surface of the base material 1 having the joint 2 by ink jet painting, and the joint spacing P in the base material 1 before the ink jet coating is measured. A color pattern having a joint spacing P closest to the measurement value is selected from a plurality of color patterns having different joint spacing P setting values. The selected color pattern is applied to the substrate 1 by ink jet painting.

  The invention according to a second aspect is characterized in that in the first aspect, the joint interval P is measured and the inkjet coating is performed on the base material 1 while the base material 1 is continuously conveyed.

  According to a third aspect of the present invention, in the second aspect, the substrate 1 is conveyed by a timing belt 3 driven by a servo motor.

  According to a fourth aspect of the present invention, in the second or third aspect, the displacement sensor is arranged along the transport path of the base material 1 as the detection device 4 for measuring the joint interval P, and the inkjet coating on the base material 1 is performed. The start timing is determined based on the detection result by the displacement sensor.

  According to the first aspect of the present invention, even if there are variations in the joint spacing between the plurality of base materials having joints, the joint spacing is measured for each base material, and based on the measurement results, a plurality of color patterns From the patterns, an appropriate color pattern having a joint spacing set value corresponding to the measured value can be selected and ink-jet coating can be applied, and the joint spacing is a standard value set in advance as the color pattern. The occurrence of misalignment between the joints of the base material and the inkjet coating due to the dimensional error of the base material can be greatly reduced as compared with the case of using only the material.

  Moreover, according to the invention which concerns on Claim 2, the measurement of a joint space | interval and inkjet coating can be performed continuously for each base material, conveying this base material on a conveyance path | route.

  Moreover, according to the invention which concerns on Claim 3, the conveyance of the base material on a conveyance path | route can be controlled correctly, and the positional accuracy of the inkjet coating with respect to the measurement of the joint space | interval of a base material and a base material is improved. This can further reduce the occurrence of misalignment between the joint of the base material and the inkjet coating.

  According to the fourth aspect of the invention, the displacement sensor for measuring the joint interval between the base materials can also be used for the timing control of the ink jet coating, and the positional deviation between the joint of the base material and the ink jet coating can be detected. The generation can be further reduced.

  Hereinafter, the best mode for carrying out the present invention will be described.

  As the base material 1 to be coated in the present invention, an appropriate one can be used. For example, a cement-based inorganic plate can be used. For the production of the inorganic board, a wet sheet (green sheet) mainly composed of cement and reinforcing fibers can be used. This wet sheet can be made by various papermaking methods such as a long-mesh type and a round-net type using a cement-based aqueous slurry as a raw material composition, but other appropriate methods such as extrusion are also adopted. be able to. Examples of the raw material composition include hydraulic cement components of 30 to 95% by mass, fillers such as silica, silica powder, and fly ash 2 to 60% by mass, and reinforcing fibers such as pulp 3 to 10% by mass. A slurry having a solid content of about 50 to 2000 parts by mass with respect to 100 parts by mass of the solid can be used. As the cement component, a composition whose composition is appropriately adjusted, such as ordinary Portland cement and blast furnace cement, can be used. As the reinforcing fiber pulp, softwood pulp, hardwood pulp, waste paper pulp, or a mixture of two or more of these can be used. The substrate 1 can be obtained by curing and curing the wet sheet.

  Curing and curing of the wet sheet can be performed by an appropriate method, but it is desirable to perform autoclave curing, and the temperature at that time is preferably 140 ° C. or higher. In practice, it is desirable that the curing is a two-stage curing of an autoclave curing and a pre-acceleration curing preceding this, that is, a pre-curing in which steam is added for heating. Thereby, the strength of the base material 1 is improved, and the structure and performance are made uniform.

  During this curing, it is desirable to apply a sealer to the surface of the wet sheet before curing. By applying this sealer, it is possible to prevent the occurrence of efflorescence during curing, and the coating film of the sealer exhibits water resistance, thereby improving the water resistance of the substrate 1. it can.

  The sealer is not particularly limited, and for example, an aqueous resin emulsion such as acrylic, vinyl acetate, epoxy, chlorinated rubber, urethane, silicon, or fluorine can be used.

  Also, in such a sealer, inorganic particles such as heavy calcium carbonate, precipitated calcium carbonate, face forest, bentonite, sericite, dolomite, talc, clay, aluminum oxide, magnesium oxide, diatomaceous earth can be mixed. it can.

  And, such a sealer can be applied to the surface of the wet sheet and heated to form a film of the sealer.

  Such a sealer is applied before curing, but when performing pre-acceleration curing as described above, it is preferable to apply the sealer after pre-acceleration curing and then perform autoclave curing. The frost damage resistance and dimensional stability of the material 1 can be improved.

  The base material 1 obtained by such curing is subjected to a drying process or a cutting process as necessary.

  As shown in FIG. 2, a joint 2 made of a concave groove is formed on one side of the base material 1 on which pattern formation is performed. The joint 2 can be formed at the same time when the wet sheet is formed by press molding or extrusion molding, for example. Although the dimension of the joint 2 is set suitably, it can form in the range of 3-50 mm in width and 1-15 mm in depth, for example. Moreover, although the space | interval between the adjacent joints 2 is also set suitably, it can be set as the range of 20-400 mm, for example.

  The base material 1 is painted by inkjet coating. Ink-jet coating can easily form a coating pattern on the base material 1 with high positional accuracy, and can easily form the coating pattern with high positional accuracy when the coating pattern is aligned with the joint 2.

  When ink-jet coating is performed, an ink receiving layer (ink receiving layer) is formed in advance on one side where the pattern of the base material 1 is formed, if necessary. The ink receiving layer has a function of fixing the ink applied at the time of inkjet coating without bleeding and has a property of absorbing ink, for example, forms a porous layer having water absorption. As the composition for forming the ink receiving layer (receiving layer forming composition), it is preferable to use an aqueous one.

As the receiving layer forming composition, an acrylic resin paint based on an acrylic emulsion or an acrylic silicon resin paint based on an acrylic silicon emulsion can be used. It is preferable to mix at least one of extender pigment and hygroscopic resin in the receiving layer forming composition. As a result, it is possible to improve the fixing property of the ink, and it is possible to prevent bleeding when forming the clear layer later with the water-based paint, and to improve the coloring property. Here, silica, alumina, aluminum hydroxide, barium sulfate, porous silica, diatomaceous earth, or the like can be used as the extender pigment, and vinyl acetate, urethane polymer, acrylic polymer, polyvinyl alcohol can be used as the hygroscopic resin. Ink-absorbing polymers such as can be used. Moreover, when forming an ink receiving layer with a receiving layer forming composition, it is preferable to apply the receiving layer forming composition on the surface of the substrate 1 at a coating amount of 30 to 200 g / m ² · wet. In addition, application | coating of a receiving layer formation composition can be performed using a spray gun, a roll coater, a flow coater, a curtain coater, etc.

  Further, the pigment in the receiving layer forming composition means a colored pigment in addition to the above-mentioned extender pigment. As coloring pigments, inorganic pigments such as titanium oxide, petal, ocher, calcium carbonate, and composite metal oxides, and organic pigments such as carbon black, quinacridone, naphthol red, cyanine blue, cyanine green, Hansa yellow, and ultramarine blue are used. be able to. Only one kind of pigment can be used, or two or more kinds of pigments can be used in combination. Among the pigments, it is preferable to use an inorganic pigment because the weather resistance of the decorative board can be improved. The particle size of the pigment is not particularly limited, but an average particle size of about 0.01 to 4 μm is preferable. The pigment can be dispersed by a usual method, and a dispersant, a dispersion aid, a thickener, a coupling agent, and the like can be used at that time.

  When such an aqueous receiving layer forming composition is used, the color developability of the coating pattern is increased when aqueous ink is used in ink jet coating.

  For example, spray coating, curtain coating, dipping, wire bar coating, applicator coating, spin coating, roll coating, electrodeposition coating, brush coating are applied to the surface of the substrate 1 provided with the sealer. The ink receiving layer can be formed by applying and curing by an appropriate method such as the above.

  Inkjet coating is applied to the substrate 1 formed in this way.

  As a coating apparatus used for performing inkjet coating, the one shown in FIG. 1 can be exemplified. This coating apparatus is configured by providing joint interval measuring means 13 on the upstream side and coating means 14 on the downstream side along the conveying means 12 for continuously conveying the substrate 1 in the horizontal direction.

  The conveying means 12 can be formed by a belt conveyor in which an infinite belt 6 is suspended between pulleys 5. As the belt conveyor, it is preferable to accurately control the position of the substrate 1 during conveyance by the conveyance means 12 by providing a timing belt 3 driven by a servo motor. The conveyance means 12 conveys the base material 1 at a speed of 30 to 40 m / min, for example.

  As the joint interval measuring means 13, an appropriate one can be provided, but each time a plurality of joints 2 on the base material 1 conveyed by the conveying means 12 pass the detection positions by the joint interval measuring means 13, What detects presence and can derive | lead-out the joint space | interval P based on this detection result can be provided.

  The joint interval P measured by the joint interval measuring means 13 can be the interval between two specific joints 2 selected from a plurality of joints 2 provided on the base material 1. At this time, although the interval between two adjacent joints 2 on the base material 1 may be measured, as shown in FIG. 2, a predetermined number of joints are provided between the plurality of joints 2 on the base material 1. If the interval between two specific joints 2a and 2b with 2 interposed therebetween is measured, an error in measuring the joint interval P can be reduced.

  As an example of the joint interval measuring means 13, there can be mentioned one provided with a displacement sensor provided along the transport path of the base material 1 by the transport means 12 as the detection device 4. As this displacement sensor, a non-contact displacement sensor such as a laser displacement sensor can be provided above the conveyance path of the substrate 1. In this case, as the base material 1 is transported by the transport means 12, the upper surface of the base material 1 is scanned by the displacement sensor. A detection signal from the displacement sensor is input to a measurement processing device 7 including various CPUs, ROMs, RAMs, and the like, and the joint interval P can be derived in the measurement processing device 7.

An example of the processing operation by the measurement processing device 7 will be described with reference to the graph of FIG. The measurement processing device 7 uses a reference height that is arbitrarily set as a reference, and when the measured value of the height of the upper surface of the substrate 1 by the displacement sensor exceeds a predetermined value X, the detection position by the displacement sensor It is determined that the front end portion of the substrate 1 has reached (determination A). After this determination, every time the measured value becomes smaller than a predetermined value Y (a value larger than the value X), at each time point It is determined that the joint 2 is present at the detection position by the displacement sensor (determination B), and then, when the measured value becomes smaller than the predetermined value X, the rear end portion of the substrate 1 is detected by the displacement sensor. It determines with having passed the detection position (determination C). These values X and Y are appropriately set according to the thickness of the substrate 1 and the depth of the joint 2. Among the _n determinations B (B _{1 to} B _n ) made between the determination A and the determination C, the two determinations B _a and B _b made at the a-th time and the b-th time are made. The joint interval P is calculated based on the elapsed time and the transport speed of the base material 1 by the transport means 12. a and b are arbitrary numbers selected in the range of 1 ≦ a <b ≦ n, and the joint 2 measured at the a-th time and the joint 2 measured at the b-th time are the two specific joints 2a, This corresponds to 2b.

  Further, the joint interval measuring means 13 includes a displacement sensor as the detection device 4 as described above. For example, as the detection device 4, an imaging device such as a CCD camera is provided above the conveyance path of the substrate 1 by the conveyance means 12. It may be provided. In this case, the joint interval P can be derived by scanning the base material 1 conveyed by the conveying means 12 with the imaging device and subjecting the obtained image data to image processing with the measurement processing device 7.

  The coating means 14 is an inkjet type coating machine provided with a coating nozzle head 8, a paint supply tank (not shown) that supplies paint to the coating nozzle head 8, a coating control system that controls the spraying of the paint from the coating nozzle head 8, and the like. Etc.

  As the coating nozzle head 8, a plurality of coating nozzle heads 8 for ejecting paints (inks) of different colors by an inkjet method are provided, and a set of headsets 9 is configured. As each coating nozzle head 8, for example, four types of coating nozzle heads 8y, 8c, 8m, and 8k that spray paints of each color of yellow, cyan, magenta, and black are provided, and coating by full-color printing can be performed. It is like that. The number of coating nozzle heads 8 is not limited to this, and a number corresponding to the type of ink used is provided. Each paint nozzle head 8 is connected to a paint supply tank for supplying ink to the paint nozzle head 8. For example, a paint supply tank that supplies yellow ink is applied to the paint nozzle head 8y, a paint supply tank that supplies cyan ink is applied to the paint nozzle head 8c, a paint supply tank that supplies magenta ink is applied to the paint nozzle head 8m, and black. The paint supply tank for supplying the ink is connected to the coating nozzle head 8k. The coating nozzle heads 8y, 8c, 8m, and 8k are arranged above the base material 1 transported by the transport means 12 along the transport direction of the base material 1.

  The painting means 14 is provided with a painting control system for controlling the ejection of ink from each painting nozzle head 8. The coating control system includes various CPUs, ROMs, RAMs, and the like, and includes a print processing device 11, a print processing device 10, and the like. The print processing apparatus 11 stores data of a plurality of color pattern patterns obtained by scanning an original image with a scanner or the like, and the print processing apparatus 10 stores color pattern pattern data corresponding to the base material 1 to be painted. Is selected and taken out from the print processing apparatus 11, and the respective coating nozzle heads 8y, 8c, 8m and 8k are controlled based on the data of the color pattern. Each coating nozzle head 8 includes, for example, an ejection nozzle whose ejection is controlled by a piezo control system or a control system for irradiating a photothermal exchange element with laser light. By controlling each ejection nozzle by the print processing device 11, yellow, It is possible to perform painting by full-color printing corresponding to the color pattern by individually controlling the spraying and stopping of the cyan, magenta, and black paints.

  As the above-mentioned color pattern pattern, the portion where the joint 2 on the substrate 1 is formed is not coated, or the portion where the joint 2 is formed and the portion where the joint 2 is not formed are different in color. The one corresponding to the position of the joint 2 of the base material 1 such as painting is stored in the print processing apparatus 11.

  As the color pattern, a plurality of patterns having different setting values of the joint spacing P are stored in the print processing apparatus 11. Each color pattern has a pattern that matches each set value.

  Here, the joint interval P can be represented by an interval between two specific joints 2 a and 2 b selected from the plurality of joints 2 provided on the base material 1. The two specific joints 2a and 2b can be the same as the two joints 2a and 2b selected when the joint interval measuring means 13 measures the joint interval P.

  As such a plurality of color pattern patterns, for example, the set value of the joint interval P is increased from the standard value in increments of a predetermined value around the color pattern whose design value is a design standard value. A plurality of reduced color patterns can be used. Specifically, for example, the standard value of the joint spacing P is set to 2436.0 mm, and the set value of the joint spacing P is changed in steps of 0.5 mm around the center, that is, the set value of the joint spacing P. 2434.0 mm, 2434.5 mm, 2435.0 mm, 2435.5 mm, 2436.0 mm, 2436.5 mm, 2437.0 mm, 2437.5 mm, and 2438.0 mm, and prepare these color patterns. , And can be stored in the print processing apparatus 11 in the coating control system. The number of the color pattern and the step size are appropriately set according to the storage capacity of the print processing apparatus 11 and the like.

  In addition, an example of a processing operation for selecting a color pattern by the print processing apparatus 10 is shown. The print processing device 10 receives the measurement result of the joint spacing P from the measurement processing device 7 of the joint spacing measuring means 13. When the measurement result is input, the print processing device 10 uses the joint pattern P closest to the measurement value of the joint spacing P from a plurality of color pattern patterns having different setting values of the joint spacing P stored in the print processing device 11. A color pattern having the set value is selected. Specifically, the measured value and the set value of each color pattern are compared, and the color pattern that minimizes the difference between the two is selected.

  Further, the print processing apparatus 10 can also determine the timing of the start of painting by the painting unit 14 based on the detection result input from the joint interval measuring unit 13. That is, when a displacement sensor is used as the detection device 4 as described above, it can be detected by the displacement sensor that the front end portion of the substrate 1 has reached the detection position by the displacement sensor. Therefore, when the measurement processing device 7 determines that the front end portion of the substrate 1 has reached the detection position by the displacement sensor as in the above determination A, the time is input to the print processing device 10. The measurement processing device 7 is based on the conveyance speed of the substrate 1 by the conveyance means 12 and the distance between the detection position by the displacement sensor and the installation position of the coating nozzle head 8. The time at which the front end portion of the substrate 1 reaches the installation position of the coating nozzle head 8 is calculated from the time at which the portion arrives. The coating nozzle head 8 is controlled so that ink is ejected from the coating nozzle head 8 at the calculated time.

  Here, in the example shown in the figure, the painting means 14 is provided with two sets of headsets 9 composed of a plurality of painting nozzle heads 8, and the joint interval measuring means 13 is provided with two detection devices 4. Yes.

  Each of the headsets 9 a and 9 b is provided with a position shifted in a direction orthogonal to the conveyance direction of the base material 1. For this reason, for example, one side of one base material 1 can be painted with one headset 9a, and the other side can be painted with the other headset 9b. When two substrates 1 are transported side by side in a direction perpendicular to the transport direction, one substrate 1 is coated with one headset 9a, and the other substrate 1 is coated with the other headset 9b. It can also be painted. Not limited to this, an appropriate number of headsets 9 can be provided.

  Further, when two headsets 9 are provided in this way, if two detection devices 4 (4a, 4b) are provided as in the illustrated example, the operation control of one headset 9a is controlled by one detection device 4a. , And the operation control of the other headset 9 a can be performed by the other detection device 4 b, and the operation control of each headset 9 can be performed based on the detection result by each detection device 4. For this reason, when performing inkjet coating with two headsets 9a and 9b on a single base material 1, the single base material 1 is detected by two detection devices 4a and 4b, respectively. Based on the detection result, the operation control of each of the headsets 9a and 9b can be performed. Further, when the inkjet coating is separately applied to the two base materials 1 by the respective headsets 9a and 9b, the respective base materials 1 are separately detected by the respective detection devices 4a and 9b, respectively. Based on the detection result, the operation control of each of the headsets 9a and 9b can be performed, and the two base materials 1 can be separately conveyed and independently subjected to inkjet coating.

  In performing inkjet coating on the base material 1, first, the base material 1 is supplied to the conveying means 12. At this time, the plurality of base materials 1 can be sequentially conveyed at intervals.

  When the substrate 1 passes through the detection device 4 by the conveying means 12, the detection device 4 detects the substrate 1. At this time, as described above, the measurement processing device 7 measures the time when the front end of the base material 1 reaches the detection position by the detection device 4 and the joint interval P of the base material 1, and the measurement result is printed. Input to the processing apparatus 10.

  Based on the measurement result of the joint spacing P, the print processing device 10 selects the color pattern to be applied to the inkjet coating as described above, and at the time when the front end portion of the substrate 1 reaches the detection position by the detection device 4. Based on the measurement result, the timing of the start of painting by the painting means 14 is determined as described above.

  When the substrate 1 passes through the coating nozzle head 8, ink is ejected from the coating nozzle head 8 under the control of the printing processing apparatus 10, and the substrate 1 is based on the selected color pattern. A design pattern is applied.

  Such measurement of the joint interval P of the base material 1, selection of a color pattern, and ink jet coating can be performed for each base material 1 when a plurality of base materials 1 are sequentially coated. For this reason, even if an error occurs in the joint interval P of each base material 1, a positional shift between the position of the joint 2 of the base material 1 and the inkjet coating on the base material 1 is suppressed.

  A clear layer for surface protection is further formed on the base material 1 (decorative board) after such ink-jet coating, if necessary. The clear layer can be formed by applying and forming an appropriate clear paint. For example, an acrylic emulsion or the like is used, and this is applied by spraying, and then heated and dried at 100 to 150 ° C. for 30 seconds or more. To form a clear layer. The thickness of the clear layer is not particularly limited, but is preferably in the range of 5 to 100 μm.

In addition, an inorganic paint layer can be further formed on the decorative board. The inorganic coating layer can be formed by applying an inorganic coating on the surface of the clear layer, thereby improving the weather resistance of the decorative board. As the inorganic coating material, a suitable one can be used. For example, a silicon alkoxide system in which a condensation reaction catalyst such as polyorganosiloxane or alkyl titanate is added to silica dispersion oligomer solution of organosilane, or silica is further added. An inorganic coating layer can be formed by applying a coating material or the like by electrostatic coating or the like, followed by baking and drying at 60 to 120 ° C. to form a film. The thickness of the inorganic coating layer is not particularly limited, but is preferably in the range of 1 to 10 μm. It is also preferable to form a photocatalyst layer. The photocatalyst layer can be formed by coating an inorganic paint containing a photocatalyst on the surface of the inorganic paint layer, thereby improving the antifouling property of the decorative board. 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 silicon alkoxide paint as described above is applied by spray coating or the like. Then, a photocatalyst layer can be formed by forming into a film by baking and drying at 60 to 120 ° C. The thickness of the photocatalyst layer is not particularly limited, but is preferably in the range of 0.2 to 1.0 μm.

It is a schematic side view showing an example of an embodiment of the present invention. It is a side view which shows an example of a base material. It is a graph which shows an example of the detection result of the substrate by a displacement sensor in an example of an embodiment same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base material 2 Joint 3 Timing belt 4 Detection apparatus (displacement sensor)
P Joint spacing

Claims (4)

  An ink-jet coating method for applying a color pattern to a substrate surface having joints by ink-jet coating, measuring a joint interval in the substrate before ink-jet coating, and having a joint pattern closest to the measured value An inkjet coating method comprising: selecting from a plurality of color pattern patterns having different set values of joint spacing and applying the selected color pattern pattern to a substrate by inkjet coating.   The inkjet coating method according to claim 1, wherein the joint interval is measured and the inkjet coating is performed on the substrate while the substrate is continuously conveyed.   The inkjet coating method according to claim 2, wherein the substrate is conveyed by a timing belt driven by a servo motor.   A displacement sensor is arranged as a detection device for measuring the joint interval, and a timing for starting inkjet coating on the substrate is determined based on a detection result of the displacement sensor. The inkjet coating method according to claim 2 or 3.

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