JP2007000769A - Apparatus and method for printing on building panel, and building panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique of printing on a protruded flat surface of a building panel without damaging its external appearance even with an error in the transfer position of a building panel. <P>SOLUTION: The printing apparatus is equipped with a plurality of printing heads comprising a plurality of ink ejection nozzles and a transfer device that transfers a building panel relative to the printing heads. The printing apparatus is constituted so that, upon printing on a protruded flat surface of a building panel, a color pattern is printed onto a printing area whose surface area is equal to that of the protruded flat surface and another color pattern is printed onto a predetermined printing area surrounding the above printing area respectively. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a building board printing apparatus, printing method, and building board, and more particularly to a technique for printing a building board using an ink jet printer.

  Ceramic boards (cement-type) building boards (ceramics type siding) are used as building boards to be constructed on the outer wall of the building. Yes. An example of the external appearance of the building board which has an uneven | corrugated design surface is shown in FIG. On the surface of the building board 10, a large number of convex flat surfaces 11 and concave joint portions 12 are formed. The flat surfaces 11 of the convex portions are surrounded by the surrounding concave joint portions 12 and separated from each other in an island shape. The convex flat surface 11 and the concave joint portion 12 are simultaneously formed by, for example, embossing in a stage before hardening the cement board.

  Conventionally, as shown in Patent Document 1 and Patent Document 2, a coating method for expressing a color pattern by inkjet coating is performed on a building board having an uneven design surface. However, this method expresses a color pattern by dripping a paint that has been pre-colored in advance, and is a method that belongs to the range of coating technology. On the other hand, in recent years, full-color printing has frequently been performed on the surface of a building board using an ink jet printer. In the case of performing ink jet printing, usually, after a print base is formed on the entire surface of the building board 10 by painting, printing of a predetermined color pattern is performed on the convex flat surface 11. For this reason, the surface color of the printing base is expressed as it is for the portions other than the convex flat surface 11.

  2. Description of the Related Art In recent years, line printer type printing apparatuses are used as inkjet printers for building boards that convey a building board, which is an object to be printed, to a fixed print head by a conveyor. In a line printer type printing apparatus, if there is an error in the transport position of the building board, printing cannot be performed accurately on the convex flat surface 11. That is, printing misalignment occurs.

  With reference to FIG. 7, the printing deviation on the flat surface of the convex portion, that is, the printing error will be described. FIG. 7 schematically shows one of the convex flat surfaces 11 of the building board on the conveyor. The left and right alternate long and short dash lines L1 and L1 indicate the ejection trajectory of the area where the ink droplets are ejected by the corresponding ink ejection nozzle group in the print head, and this is referred to as a print line. Here, the dimension of the convex flat surface 11 measured along the traveling direction of the building board is a, and the dimension of the convex flat surface 11 measured along the direction orthogonal to the traveling direction is b. Moreover, the dimension of the printing area | region measured along the direction orthogonal to the running direction of a building board is set to B1. Both dimensions are equal and B1 = b.

FIG. 7A shows a case where the building board is accurately conveyed along a predetermined travel line and is not displaced in the width direction. Both sides of the convex flat surface 11 are on the printing lines L1 and L1. Accordingly, the printing is performed on the convex flat surface 11 and without protruding beyond that. FIG.7 (b) shows the case where the building board is conveyed shifting | deviating to the width direction. Both sides of the convex flat surface 11 are displaced from the printing lines L1 and L1. Therefore, on one side of the convex flat surface 11, printing is performed on a part 12 a of the slope forming the concave joint portion 12, and on the other side of the convex flat surface 11, a region 11 a where no printed pattern is formed is formed. The In this region 11a, the surface color of the printing base is expressed as it is.
Patent No. 3027366 Japanese Patent No. 2784529

  In a line printer type printing apparatus, a building board, which is an object to be printed, is conveyed one by one under a print head by a conveyor. Upstream of the conveyor, the building board must be accurately mounted in place on the conveyor. However, it is difficult to mount the building board accurately and always at a fixed position. Due to this, when an error occurs in the transport position of the building board, as described above, printing on the convex flat surface 11 of the building board cannot be performed accurately. In other words, the color pattern to be printed on the convex flat surface 11 is printed with a shift. When such a building board is constructed on the outer wall of the building, there is a great risk that the harmony of the color pattern on the entire outer wall will be lost, resulting in a sense of incongruity.

  The objective of this invention is providing the technique which prints the convex part flat surface of a building board so that the construction external appearance of a building outer wall surface may not be impaired, even if there exists an error in the conveyance position of a building board.

  According to the present invention, a printing apparatus for a building board conveys a plurality of printing heads having a plurality of ink jet nozzles and a building board having a convex flat surface and a concave joint so as to pass under the printing head. A printing apparatus for a building board configured to print a colored pattern on the flat surface of the convex part of the building board by ejecting ink from the nozzle. An individual color pattern is printed on a print area equal to the area and a predetermined print area outside the print area.

  According to the present invention, in the printing apparatus for building boards, gradation printing is performed on the outer predetermined printing area. The width of the outer predetermined printing area is larger than the transport error in the direction orthogonal to the transport direction of the building board.

  According to the present invention, in the printing apparatus for building boards, the print image data obtained by combining the print image data for the print area equal to the area of the flat surface of the convex portion and the print image data for the predetermined print area on the outside Print based on this.

  According to the present invention, a method for printing a building board includes a conveying step for conveying the building board so as to pass under the print head, and a protrusion of the building board by ejecting ink from a nozzle provided in the print head. A printing step for printing a color pattern on the flat part of the printing surface, and the printing step is performed separately for a printing area equal to the area of the flat surface of the convex part and a predetermined printing area outside the printing area. Print the color pattern.

  According to the present invention, in the method for printing a building board, in the printing step, gradation printing is performed on the outer predetermined printing area. The width of the outer predetermined printing area is larger than the transport error in the direction orthogonal to the transport direction of the building board.

  According to the present invention, the building board printing method includes an image data synthesis step of synthesizing print image data for a print area equal to the area of the flat surface of the convex portion and print image data for the predetermined print area on the outside.

  According to the present invention, the building board has a convex flat surface and a concave joint surface around the convex surface, and a printing area equal to the area of the convex flat surface and a predetermined printing area outside the area, Individual color patterns are printed. In the predetermined print area on the outside, gradation printing is performed.

  ADVANTAGE OF THE INVENTION According to this invention, even if there exists an error in the conveyance position of the building board at the time of printing, it becomes possible to perform the printing of the building board which can express a favorable outer wall surface design.

  The outline of the printing method of the building board by this invention is demonstrated with reference to FIG. When an original plate, which is a cement plate with an embossed surface, is put into a continuous processing line, first, in steps S11 and S12, a back sealer is applied to the back surface of the original plate and dried, thereby waterproofing the back surface of the original plate. Do. Subsequently, in step S13, the entire surface portion of the original plate having the concavo-convex design surface is subjected to undercoating by spray coating, and in step S14, a drying process is performed. Thereby, the coating foundation for the subsequent intermediate coating is formed. In step S15, the entire surface of the concavo-convex design surface is subjected to intermediate coating by spray coating, and in step S16, a drying process is performed. As a result, the surface color of the concave joint portion 12 is expressed, and the printing foundation for the subsequent printing process is formed on the convex flat surface 11. Subsequently, in step S17, full-color ink jet printing by an ink jet printer is performed on the convex flat surface 11 on which the printing base is formed. In this case, a line printer type printing apparatus is used, which will be described with reference to FIG. Thereafter, in step S18, the printing surface is dried. Subsequently, in step S19, clear coating for imparting weather resistance and the like is applied to the entire printed surface by spray coating, and drying processing is performed in step S20. Then, it cools by air and takes out the printed processed board from a line.

  An example of a line printer type printing apparatus according to the present invention will be described with reference to FIG. 2A is a schematic diagram illustrating a planar configuration of a line printer type printing apparatus, and FIG. 2B is a schematic diagram illustrating a side configuration of the line printer type printing apparatus illustrated in FIG. 2A. . The printing apparatus includes print heads 23, 24, 25, and 26 that eject inks of yellow, magenta, cyan, and black in order from the upstream side. Each print head includes one row of nozzle arrays 23a and 24a. 25a and 26a are provided. A photoelectric sensor having a projector 27 and a light receiver 28 is provided further upstream of the print head, and detects that the building board 10 conveyed by the conveyor 21 has passed the reference position immediately before the print head 23. . The roll 29 that drives the conveyor 21 is provided with an encoder 30. The printing apparatus further includes a control unit 31 for controlling the entire printing apparatus, a design data input unit 32 for inputting design data of the building board, and print image data for printing the convex flat surface of the building board. An image data input unit 33 and a memory 34 for storing design data and image data are provided.

  When the building board 10 approaches the print head, it is detected by the photoelectric sensors 27 and 28. The control unit 31 calculates the time at which the building board 10 reaches just below the nozzles of each print head from the conveyance speed detected by the encoder 30. The control unit 31 supplies a print command to each print head when the building board 10 reaches a time immediately below the nozzle array of each print head.

  With reference to FIG. 3, the printing method of the convex part flat surface of the building board by this invention is demonstrated. FIG. 3 is a schematic drawing of one of the convex flat surfaces 11 of the building board on the conveyor. FIG. 3 (a) shows a state in which the building board is transferred in the right direction on the conveyor, and FIG. 3 (b) shows the building board in the correct position without being shifted in the lateral direction on the conveyor. FIG. 3 (c) shows a state in which the building board is transported while being shifted leftward on the conveyor.

  The left and right alternate long and short dash lines L <b> 1 and L <b> 1 represent conventional print lines planned for the convex flat surface 11. Assuming that the dimension between the two printing lines L1 and L1 is B1, the dimension B1 represents the dimension of the printing region in the direction orthogonal to the traveling direction of the building board, that is, in the width direction. The width B1 of the printing area is equal to the width b of the convex flat surface 11 of the building board. That is, B1 = b. Similarly, the vertical dimension A1 with respect to the convex flat surface of the printing area is equal to the vertical dimension a of the convex flat surface 11 of the building board. That is, A1 = a. Therefore, the area S1 of the print region is equal to the actual area s of the convex flat surface. That is, S1 = s.

  Solid lines L2 and L2 represent printing lines on the flat surface of the convex portion according to the printing method of the present invention. Assuming that the dimension between the two printing lines L2 and L2 is B2, the dimension B2 represents the dimension in the direction perpendicular to the traveling direction of the building board, that is, the width direction of the printing region 11a (the inner region surrounded by a broken line). . In the printing method of the present invention, the width B2 of the printing region 11a is larger than the width b of the convex flat surface 11 of the building board. That is, B2> b. Similarly, in the printing method of the present invention, the vertical dimension A2 with respect to the portion corresponding to the convex flat surface of the printing region 11a is larger than the vertical dimension a of the convex flat surface 11 of the building board. That is, A2> a. The area S2 of the printing region 11a is larger than the actual area s of the convex flat surface 11. That is, S2> s.

  According to this example, the area S2 of the printing region 11a with respect to the convex flat surface is larger than the actual area s of the convex flat surface 11, and the printing region 11a with respect to the convex flat surface includes the convex flat surface 11. . Therefore, even if the position of the convex flat surface 11 is shifted due to the displacement of the building board, the convex flat surface 11 is always in the print region 11a with respect to the convex flat surface.

  The width B2 of the printing region 11a is assumed to be larger by p × 2 than the width b of the convex flat surface 11 of the building board. The width p is set to a dimension that is necessary and sufficient to absorb the displacement in the width direction of the building board conveyed by the conveyor. In the example of FIGS. 3A and 3C, it is assumed that the convex flat surface 11 is shifted by t in the width direction. The width p around the print area 11a is at least larger than the shift amount t. For example, when the amount of displacement in the width direction of the building board is 1 mm, the width p is at least larger than 1 mm.

  In the printing according to the present invention, with respect to the region of B1 * A1 at the same position indicated by the two-dot chain diagonal line in each upper stage portion of FIGS. 3A to 3C, that is, the region of b * a = s. Thus, the printing of the scheduled contents on the convex flat surface 11 (printing in the case where no positional deviation is considered) is executed. Further, gradation printing is executed on a frame area (with a width of p) indicated with spots in the drawing, that is, an S2-s area at the same position.

  As a result, in the case of FIG. 3A, the gradation print pattern and the left end portion of the convex flat surface 11 are included in a partial area in the concave joint portion 12 adjacent to the left end portion of the convex flat surface 11. A nearby printed pattern is printed adjacently. Also, a gradation printing pattern is printed near the right end of the convex flat surface 11.

  In the case of FIG. 3B, a planned printing pattern is printed as it is on the convex flat surface 11, and a gradation printing pattern is printed in a partial region of the concave joint portion 12 around it.

  In the case of FIG. 3C, a gradation printing pattern is printed near the left end of the convex flat surface 11, and in a partial region of the concave joint portion 12 adjacent to the right end of the convex flat surface, A printing pattern near the right end of the convex flat surface 11 and a gradation printing pattern are printed adjacent to each other.

  As described above, according to the printing according to the present invention, the printing pattern planned on the convex flat surface 11 is formed at substantially the same position regardless of the actual traveling position of the convex flat surface 11, A printed pattern with gradation is formed around the periphery. When the building board printed in this way is applied to the outer wall surface of the building, since the printing defect as shown in FIG. 7 does not occur, it is possible to obtain a good construction appearance with no sense of incongruity as a whole. Become.

  With reference to FIG. 4, the printing of the convex part flat surface 11 of a building board is further demonstrated. Fig.4 (a) is the figure which expanded a part of surface of the building board printed by the printing method by this invention. FIG. 4B shows a cross-sectional configuration cut along the line BB in FIG. Here, it is assumed that the building board is conveyed at the correct position without being shifted laterally on the conveyor. The print region 11a is composed of a main region 111 equal to the area of the convex flat surface 11 and a region 112 outside thereof. The main region 111 is on the convex flat surface 11, but the outer region 112 is in an inclined portion that forms the concave joint portion 12. Gradation printing is performed on the outer area 112.

  A method for generating print image data used in the printing method according to the present invention will be described with reference to FIG. First, as shown in FIG. 5A, print image data 41 for the convex flat surface 11 of the building board is prepared. For this print image data 41, an area of the print data 40 corresponding to the enlarged print area 11a for the convex flat surface 11 according to the present invention is set. As shown in FIG. 5B, print image data 42 is newly generated in a frame-like region between the print image data 41 and the print data 40 according to the present invention. The print image data 42 is print image data to be expressed by gradation printing, as shown in FIG. Specifically, for example, an image area in a frame state in which image data corresponding to the image area corresponding to the print image data 41 is removed from an image (the pixel diameter is increased) of the print image data 41 expanded to the print area 11a. Is formed by performing data processing for increasing the number of data thinning out in the outward direction. Subsequently, as shown in FIG. 5C, the print image data 41 according to the present invention is generated by combining the print image data 41 and the print image data 42 for gradation printing.

  Although an example of the present invention has been described above, the present invention is not limited to the above-described example, and various modifications can be made by those skilled in the art within the scope of the invention described in the claims. It will be understood.

It is explanatory drawing for demonstrating the process of the printing method of the building board by this invention. It is a figure which shows the outline of the printing apparatus for building boards by this invention. It is explanatory drawing for demonstrating the printing method of the convex part flat surface of the building board by this invention. It is a figure which shows the example of gradation printing. It is a figure which shows the example of the production | generation method of the printing image data of the printing method of the building board by this invention. It is a figure which shows the external appearance of a building board. It is explanatory drawing for demonstrating the printing shift | offset | difference in the convex part flat surface of a building board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Architectural board, 11 ... Convex part flat surface, 12 ... Concave joint part, 11a ... Printing area, 21 ... Conveyor, 23, 24, 25, 26 ... Print head, 27 ... Light projector, 28 ... Light receiver, 29 ... Roll , 30 ... encoder, 31 ... control unit, 32 ... design data input unit, 33 ... image data input unit, 34 ... memory

Claims (10)

  A plurality of print heads having a plurality of ink ejection nozzles, and a transport device that transports a building board having a convex flat surface and a concave joint portion so as to pass under the print head, and ink from the nozzles. In the building board printing apparatus configured to print a color pattern on the flat surface of the convex portion of the building board by spraying, a printing region equal to the area of the flat surface of the convex portion and an outer side of the printing region A building board printing apparatus that prints individual color patterns on a predetermined printing area.   2. The building board printing apparatus according to claim 1, wherein gradation printing is performed on the outer predetermined printing area.   2. The building board printing apparatus according to claim 1, wherein a width of the outer predetermined printing area is larger than a transport error in a direction orthogonal to the transport direction of the building board.   2. The building board printing apparatus according to claim 1, wherein the print image data obtained by synthesizing the print image data for the print area equal to the area of the flat surface of the convex portion and the print image data for the predetermined print area on the outside. A printing apparatus for building boards, wherein printing is performed based on the printing.   A transport step for transporting the building board so as to pass under the print head, and a printing step for printing a colored pattern on the convex flat surface of the building board by ejecting ink from a nozzle provided in the print head. And the printing step prints an individual color pattern on a print area equal to the area of the flat surface of the convex part and a predetermined print area outside the print area. How to print building boards.   6. The building board printing method according to claim 5, wherein, in the printing step, gradation printing is performed on the outer predetermined printing area.   6. The method for printing a building board according to claim 5, wherein a width of the predetermined printing area on the outside is larger than a conveyance error in a direction orthogonal to the conveyance direction of the building board.   6. The building board printing method according to claim 5, further comprising an image data synthesis step of synthesizing print image data for a print area equal to an area of the flat surface of the convex portion and print image data for the predetermined print area on the outside. The printing method of the building board which is characterized.   An individual color pattern is printed on a print area having a convex flat surface and a concave joint around it, and a predetermined print area outside the print area equal to the area of the convex flat surface. Architectural board characterized by   10. The building board according to claim 9, wherein gradation printing is performed on the outer predetermined printing area.

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