JP2007002460A - Decorative building board and method of producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decorative building board which can develop a print image rich in three-dimensional effect in the entire print surface formed of a bumpy decorative surface without changing the essential resolution of the print image even in printing of a recessed area. <P>SOLUTION: In the decorative building board, the print image constituted of image elements having different sizes is ink-jet printed on a flat protrusion area where an image forming a pattern is developed and a recessed area where an image formed smaller than the image developed in the flat protrusion area is printed. The size of the image elements is changed according to the size of the image. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a decorative building board in which decorative printing is performed on a design surface of a building board and a method for manufacturing the same, and in particular, it is possible to continuously form a three-dimensional printed image on a concave and convex design surface, and not to feel a sense of incongruity. The present invention relates to a decorative building board capable of obtaining an outer wall appearance and a method for manufacturing the same.

  In general, since printing is performed on a large number of printed materials using a plate, when the printed materials have the same form (material), the same print image is formed on each printed surface. The gravure offset printing method for a building board is a typical printing method, and many decorative building boards with the same pattern are produced.

  Conventionally, an inkjet printing method has been used as a method for manufacturing a decorative building board. According to this method, a colored pattern is expressed and formed by dropping ink droplets onto the surface of the substrate to be coated in accordance with the opening / closing control data of each ink ejection nozzle created in advance. Specifically, the nozzle hole diameter is the same, the size of the ink dot is determined by the size of the ejected ink droplet, and the landing position of the ink droplet is determined by the traveling speed of the coated plate and the opening / closing frequency of the nozzle Is determined. By determining such printing conditions, the same pattern can be formed.

  When a building board is used as an outer wall board, in order to express a three-dimensional feeling, the design surface of many building boards is formed in uneven | corrugated shape. When printing with an inkjet line printer using such a concavo-convex design surface as the printing surface, the distance between the nozzle and the printing surface (spotted spot of ink droplets) changes as the plate runs at a constant speed. The printed image is not accurately formed.

  FIG. 7 is a diagram for explaining planned landing points of ink droplets. In FIG. 7, L indicated by a solid line is a line to be printed, HL partially indicated by a broken line is a horizontal line within the printing reference plane, and the traveling direction of the plate is indicated by Y. When printing is performed from the right flat convex portion to the left flat convex portion through the concave portion that continues from the right flat inclined surface → the flat bottom surface → the left flat inclined surface as in the printing line L, the ink droplets according to the ink droplet ejection speed If the flight speed is sufficiently higher than the traveling speed of the plate, if the slight displacement of the landing point due to the flight distance difference (time difference) of the ink droplets is ignored, the ink droplet ejection frequency f1 When printing is performed without changing, the dot pitch for forming the print image that appears on both the right and left flat slopes is widened, so that the formed print image is swollen and its resolution is greatly reduced. The degree of the reduction varies depending on the inclination angle of the slope. The ejection timing shown on the horizontal line HL of the printing line L corresponds to the dot pitch a in FIG. In addition, black circles ● indicate printing dots, and white circles ○ indicate virtual printing dots. A print image is formed on the surface to be printed in accordance with a control line image formed by black and white circles (a virtual image formed on a print reference surface defined by ink ejection timing and corresponding to print control data). Therefore, when the control line image is designed on the basis of the surface of the flat convex portion, the projected image on the slope of the control line image is formed on the print image that is expressed on the left and right flat slope portions. become.

  FIG. 8 is a diagram for explaining planned landing points of ink droplets. As shown in FIG. 8, when printing is performed at the ink droplet ejection frequency f1, in order to make the size of the print image formed on the flat slope and the image resolution the same as the print image on the flat convex surface, If printing is performed by changing the ink droplet ejection frequency for both flat slope portions to f2, it is possible to form a print image having the same size and the same image resolution on the entire printing surface (for example, Patent Document 1).

As the print control data in this case, an opening control line image is created in which the white circle position on the virtual print line at the position of the concave opening on the horizontal line HL of the print line L is a virtual image expression point. do it. Specifically, an extended image of the print image drawn on the left flat convex surface is virtually developed on the left flat slope, and an extended image of the print image drawn on the right flat convex surface is developed on the right flat slope. A control line image obtained by combining the control line image obtained by back projecting the virtual extension image developed on the horizontal line with the control image data for flattening the convex portion may be formed in advance as print control data for the opening. . In the flat bottom surface, printing may be performed at the same frequency as the ink droplet ejection frequency f1 for the flat convex surface.
JP 2004-114500 A

  However, for example, in the case of an inkjet printing method using a piezo method, the time required for one cycle of ink droplet ejection operation cannot be changed abruptly because of the basic design in order to form a print image. The frequency change of f1 → f2 → f1 must be executed smoothly. However, in the case where the uneven shape of the inner surface of the recess changes in a complicated manner, there is a limit even if a highly accurate PLL (Phase Locked Loop) is used, and it is inevitable that the desired image formation cannot be followed.

  SUMMARY OF THE INVENTION In view of the above problems, the present invention can make a print image rich in three-dimensional appearance on the entire surface to be printed consisting of a concavo-convex design surface without changing the basic print image resolution even in the printing of concave portions. It aims at providing a building board and its manufacturing method.

  The decorative building board of the present invention is a decorative building board in which a printed image formed by pixels composed of a plurality of ink dots is inkjet-printed on an uneven design surface composed of flat convex portions and concave portions, and is printed on the concave portions. The patterned pattern is smaller than the patterned pattern printed on the flat convex portion.

  According to the depth from the surface of the said flat convex part in the said recessed part, the said pattern is small in a deep place, and can express the printed image which is rich in a three-dimensional effect.

  Since the pixels in the concave portions are smaller than the pixels in the flat convex portions, it is possible to develop a printed image that is rich in stereoscopic effect.

  The pixel has a size corresponding to the size of the design pattern, and can express a printed image with a more three-dimensional effect.

  The method for manufacturing a decorative building board according to the present invention is a method for manufacturing a decorative building board for inkjet printing a printed image formed by pixels composed of a plurality of ink dots on a concavo-convex design surface composed of flat convex portions and concave portions, The pattern printed on the concave portion is smaller than the pattern printed on the flat convex portion.

  According to the present invention, by reducing the size of the pattern that forms the ink jet print image with respect to the concave portion, it is possible to develop a print image rich in three-dimensional effects on the entire uneven design surface. As a result, it is possible to develop a print image rich in three-dimensionality on the entire surface to be printed composed of the concave and convex design surface without changing the basic print image resolution even in the printing of the concave portions, that is, without changing the ejection frequency. A decorative building board and a manufacturing method thereof can be realized.

  The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a diagram for explaining the principle of pattern design of a decorative building board according to an embodiment of the present invention.

  In the present invention, the concept of a one-point perspective method, which is a perspective drawing method generally used in 3D modeling, is applied. For example, when viewing a cube from the direction of one surface, the one-point perspective method shows that one surface as it is, and all the lines and surfaces orthogonal to the screen converge toward the vanishing point at the center of the horizon. This is a visual drawing method.

  The one-point fluoroscopy method shown in FIG. 1A is a method of drawing and developing a three-dimensional object on a two-dimensional plane, and this is developed in a three-dimensional space as shown in FIG. Furthermore, it is considered that the plane A (surface in front of the cube) shown in FIG. 1 (a) is reduced in size at a position separated by a distance z, and appears as a plane B (surface behind the cube). As shown in FIG. 1B, this is developed and displayed in the Z-axis direction (direction in which the object plane is observed) perpendicular to the paper surface. Note that the vanishing point shown in FIG. 1A is appropriately set according to the contrast between the area of the plane A and the distance z.

  In FIG. 1 (b), when it is assumed that the outer wall plate having the concavo-convex design surface is observed from the front, the recess surface opening is a plane A (a known shape in the template design, and the known area value SA is This indicates that the plane A of the concave opening is seen as a plane B when the plane A is a distance z away. That is, the plane A and the plane B displayed in FIG. 1B are similar figures.

  If the position of the plane B is set to a flat bottom surface position in the recess, the space front-rear distance between the plane A and the plane B is z0, which is a known number (template design value). This known number (template design value) is the depth to the bottom surface, but the plane B is not a flat bottom surface.

  Here, the area ratio [SA / SB] of these two planes is acquired from the image information of the plane A and the plane B displayed on the screen. This area ratio corresponds to the ratio of the image sizes. The image information corresponds to the image compression rate and is a value corresponding to the distance z0. Similarly, the area ratio value of [SA / SB] is defined corresponding to each z value from z = 0 to z0. That is, the area ratio value [SA / SB] is a function of the distance z.

  As a result, it is considered that the image developed on the plane A is compressed and developed in accordance with the area ratio [SA / SB] on the B plane, and the size of the image is compressed. The pixels also become smaller, and on the B side, the pixels become smaller according to the reciprocal ratio value [SB / SA].

  In this way, the image at a position apart by a certain distance becomes a smaller image as the distance increases, and the pixels become smaller. If the reference surface for observing the flat convex surface on the design surface of the outer wall plate is used, an image within a predetermined visual range at a position separated by a distance z from the position is displayed in accordance with the separation distance z. In addition to reducing the range, the pixels are recognized in a smaller state.

  Next, a method for creating print control data for the recesses on the uneven design surface of the outer wall plate will be described. Here, a case where printing is performed on a concave portion having a simple shape composed of left and right flat slopes and a flat bottom surface is taken as an example.

  Each portion on the inner surface of the concave portion has a difference in the separation distance (that is, depth) z from the opening surface position at the same level as the flat convex surface that is the printing reference surface. Therefore, in the present embodiment, the size of each developed image and the size of the pixel are determined by the individual separation distance z so that each image is developed in a virtual horizontal plane to which each part inside the concave portion belongs.

  FIG. 2 is a diagram showing a control line image by creating print control data.

  As shown in FIG. 2, the image developed in the virtual horizontal planes D1 to D2 including the point D (separation distance z1) on the inner surface of the left flat slope is an opening that becomes a printing reference plane by the separation distance z1 as described above. The size of the developed image and the size of the pixel are uniquely determined for the current image created on the surface of the part. The point E is similarly determined. However, in the recess shape here, each part image can be developed in the virtual horizontal plane only in the flat bottom surface part in E1 to E2, and the image development of each part image in the horizontal plane is performed on the left and right flat slope parts. Can not. Therefore, in the present embodiment, as shown in FIG. 2, the virtual horizontal planes C1 to C2 that are the opening surface positions at the same level as the surface of the flat convex portion are used as the image development region for developing the image of layer 1, and the concave portion An image division point (D point in this case) is determined at an appropriate position according to the depth z of the inner surface, and a virtual horizontal plane including each image division point is arranged from the top in the image development area of layer 2 and the image development area of layer 3 ,..., Each designed image is developed for each image development region. As a result, the size of the image developed in each image development area and the size of the pixel are determined according to the layer number to which the image belongs.

  FIG. 3 is a diagram illustrating the control line image developed in each layer corresponding to the control line image of FIG. FIG. 4 is a view showing a combined image obtained by combining images developed in the respective layers in FIG.

  As shown in FIG. 3A, the developed image at the opening surface level developed in the layer 1 is at the same level as the reference flat convex surface (separation distance z = 0). The size and the size of the pixel are the same as the image developed on the surface of the flat convex portion, and are designed as an extended pattern on the surface of the flat convex portion, for example. The pixel constituting the image developed here is assumed to be pixel 1. In this embodiment, the size of the pixel is proportional to the size of the image, and the pixel 1 has the same size as the constituent pixels of the print image formed on the flat convex surface around the concave portion, and the pixel pitch. Is the same.

  As shown in FIG. 3B, the image developed on the layer 2 has a smaller image size and pixel size according to the separation distance z1 than the image developed on the layer 1. Although it is formed as described above and is configured by the pixels 2, it is further assumed that the opening horizontal plane portions D3 to D4 at the image division point position (point D) are cut out from the developed image.

  Further, as shown in FIG. 3C, the image developed on the layer 3 has a smaller image size and pixel size depending on the separation distance z2 than the image developed on the layer 2. Although it is formed as described above and is configured by the pixels 3, it is further assumed that the horizontal plane image corresponding to the bottom area is cut out from the developed image.

  Then, the cut-out images in the layers 1, 2, and 3 are overlapped in order with the respective XY plane positions being aligned, thereby forming the composite image shown in FIG. The composite image shown in FIG. 4 is a set of control line images shown in FIGS. As is clear from the comparison between the image in FIG. 3A and the synthesized image in FIG. 4, the synthesized image is developed on the entire inner surface of the concave surface shown in FIG. 2. The size of the pixels 1, 2, and 3 constituting each cut-out image is proportional to the size of the formed image.

  If printing is performed on the concave portion in accordance with the composite image obtained in this manner, the size of the image and pixels developed on each portion of the inner surface changes according to the depth of the concave portion. Specifically, a printed image and pixels having the same size as the surface of the flat convex portion are expressed in a shallow portion close to the surface of the flat convex portion, and an image and a pixel are formed small in the deep portion. . As a result, a concave printed image having a very three-dimensional effect is expressed. A better stereoscopic effect can be obtained than in the case of printing with an equal dot pitch shown in FIG.

  FIG. 5 is a diagram showing the relative positions of ink dots that continuously form pixels 1, 2, and 3 having different sizes and the nozzle array. As shown in FIG. 5, even if the nozzle pitch and the ink droplet ejection frequency are fixed, it is possible to form images with different sizes depending on the inkjet line printer.

  As described above, in the inner surface printing of the concave portion, the perspective image effect that can be seen according to the depth of each portion can be realized by the inkjet line printer having the nozzle array fixed, so that it is possible to produce a good three-dimensional effect brought about by the outer wall plate. It becomes like this.

  In addition to the size of the image and the size of the pixel, by adding a color effect, for example, if gradation changes such as applying gradation according to multiple layers are added at the same time, the three-dimensional effect is more prominently produced. can do.

  In addition, in order to provide an image transition area between each layer, an auxiliary layer is further provided, and an auxiliary image with pixels of a size for image transfer is developed by this auxiliary layer, thereby developing a smoother continuous pattern of developed images. Is formed, and a composite image in which a plurality of layer images are superimposed can be obtained.

  The above-described embodiment is an example, and the number of layers, the nozzle pitch, and the like can be arbitrarily set.

  FIG. 6 is a diagram showing a configuration of a line-type inkjet printing apparatus used in the method for manufacturing a decorative building board according to the present embodiment. The print heads 301 (Y), 302 (M), 303 (C), and 304 (K) each have a nozzle array NA in which a plurality of nozzles are linearly arranged, and are orthogonal to the transport direction of the printing plate 400. It is arranged in the direction to do. When the print heads 301 to 304 perform printing for one dot line, the conveyor 310 conveys the printing plate 400 by one dot line. This is repeated for printing.

  Of the manufacturing process of the decorative building board according to the present embodiment, the inkjet printing process is as follows.

  An ink jet printing layer is formed by performing ink jet printing on a predetermined range or the entire surface of a printing plate on which a roll coater coating layer (top coat layer) is formed. In the ink jet printing, ink can be deposited (printed) on an arbitrary place on the printing surface by computer control.

  In this way, by changing the size of the pixels constituting the print image with respect to the concave portion, it is possible to express a three-dimensional print image with respect to the entire uneven design surface, and the basic print image resolution. Can be expressed on the entire surface to be printed consisting of the concavo-convex design surface without changing the ink in the printing of the recesses, that is, without changing the jetting frequency.

  In addition, this invention is not limited to the said Example.

  The depth and the size of the pattern do not need to be in a linear proportional relationship. If the size of the pattern in the recess is smaller than that of the flat protrusion, a three-dimensional effect can be expressed as such.

  In addition, since the stereoscopic effect can be expressed by reducing the size of the pattern according to the depth of the concave portion, the size of the pixel may not be set according to the depth.

It is a figure explaining the principle of the pattern formation of the decorative building board by one embodiment of this invention. It is a figure which shows the control line image by printing control data creation in this Embodiment. It is a figure which shows the control line image developed in each layer corresponding to the control line image in this Embodiment. It is a figure which shows the synthesized image which synthesize | combined the image expand | deployed by each layer in this Embodiment. It is a figure which shows the relationship position of the ink dot which forms continuously the pixel 1, 2, 3 from which the magnitude | size differs in this Embodiment, and its nozzle array. It is a figure which shows the structural example of the line-type inkjet printing apparatus used with the manufacturing method of the decorative building board by this Embodiment. It is a figure explaining the landing point of the conventional ink droplet. It is a figure explaining the landing point of the conventional ink droplet.

Explanation of symbols

1, 2, 3 pixels 301 to 304 Print head 310 Conveyor 400 Printed board

Claims (5)

A decorative building board in which a printed image formed by pixels composed of a plurality of ink dots is inkjet printed on a concavo-convex design surface composed of flat convex portions and concave portions,
A decorative building board, wherein a pattern printed on the concave portion is smaller than a pattern printed on the flat convex portion.   2. The decorative building board according to claim 1, wherein the pattern is small in a deep place according to a depth from a surface of the flat convex portion in the concave portion.   The decorative building board according to claim 1 or 2, wherein the pixels in the concave portion are smaller than the pixels in the flat convex portion.   The said pixel is a magnitude | size according to the magnitude | size of the said pattern, The decorative building board of Claim 3 characterized by the above-mentioned. A method for manufacturing a decorative building board for inkjet printing a printed image formed by pixels composed of a plurality of ink dots on a concavo-convex design surface composed of flat convex portions and concave portions,
The method for producing a decorative building board, wherein a pattern printed on the concave portion is smaller than a pattern printed on the flat convex portion.

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