JP2006256300A - Scale for control of dampening water and dampening water control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dampening water controlling scale which enables even an inexperienced operator to easily judge whether or not a supply amount of dampening water is suitable by visual observation and to provide a dampening water controlling method. <P>SOLUTION: The dampening water controlling scale P comprises first detection patches PY1, PM1, PC1, PK1 and PG1 and second detection patches PY2, PM2, PC2, PK2 and PG2. The first detection patches PY1, PM1, PC1 and PK1 comprise a ten thousand patch of 400 lines in total and 67% in duty ratio. Further, the second detection patches PY2, PM2, PC2 and PK2 comprise a half tone dot patch of 150 lines in the number of lines and 80% in the dot percentage. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a dampening water management scale and a dampening water control method using the dampening water management scale.

  In lithographic printing using fountain solution, it is known that the print quality depends on the supply amount of the fountain solution. For this reason, in general, an experienced operator currently visually checks the printed matter and empirically determines the supply amount of dampening water. In addition, there is a conventional technique in which the dampening water film thickness on the plate surface or the dampening water roller surface is measured, and control is performed to keep this constant.

On the other hand, the present applicant prints a detection patch whose density changes due to a change in the dampening water together with an image of the printed matter, and controls the amount of dampening water supplied while measuring the density of the detection patch. A water supply method has been proposed (see, for example, Patent Document 1).
JP 2002-355950 A

  According to the fountain solution supply method described in Patent Document 1, the supply amount of the fountain solution can be automatically controlled by measuring the density of the detection patch, which is appropriate without depending on the experience of the operator. It becomes possible to obtain the supply amount of dampening water. However, there is still a request that an operator wants to confirm the suitability of the amount of dampening water supplied by visual confirmation during printing.

  The present invention has been made to solve the above-described problem, and a dampening water management scale that can easily determine the suitability of the dampening water supply amount visually even by an inexperienced operator and An object is to provide a dampening water control method.

  The invention according to claim 1 is a dampening water management scale for managing the amount of dampening water supplied, from a line or halftone dot having a line number of 200 lines or more and an area ratio of 60% or more. A first detection patch having a number of lines smaller than that of the first detection patch and a second detection patch having an area ratio larger than that of the first detection patch. When the supply amount is appropriately controlled, the first detection patch and the second detection patch have substantially the same density.

  According to a second aspect of the present invention, in the first aspect of the invention, when the supply amount of dampening water is appropriately controlled, the concentration of the first detection patch and the second detection patch The area ratio or the number of lines of the first detection patch and the second detection patch is adjusted so that the density is substantially the same.

  The invention according to claim 3 is the invention according to claim 2, wherein the number of lines of the first detection patch is 300 lines or more.

  The invention according to claim 4 is the invention according to claim 2, wherein the number of lines of the second detection patch is less than 200 lines.

  According to a fifth aspect of the present invention, in the invention according to any one of the second to fourth aspects, the first detection patch is formed of a line, and the second detection patch is formed of a halftone dot.

  The invention described in claim 6 is the invention described in any one of claims 2-5, wherein the first detection patch and the second detection patch are arranged adjacent to each other.

  According to a seventh aspect of the present invention, in the sixth aspect of the present invention, one of the first detection patch and the second detection patch is disposed adjacent to the inside of the other.

  The invention according to claim 8 is the invention according to claim 6 or 7, wherein the first detection patch and the second detection patch are for each color of yellow, magenta, cyan, and black. Are disposed adjacent to each other.

The invention according to claim 9 is the invention according to claim 8,
On the first detection patch for yellow and the second detection patch for yellow, halftone images of cyan, magenta, and black having the same halftone dot area ratio are overlaid and printed.

  A tenth aspect of the present invention is a dampening water control method using the dampening water management scale according to any one of the first to ninth aspects, wherein the dampening water control method is any one of the first to eighth aspects. The printing process for printing the image of the dampening water management scale according to claim 1, and the supply amount of the dampening water by comparing the images of the first detection patch and the second detection patch printed in the printing process And a determination step of determining whether the product is appropriate.

  The invention according to claim 11 is a dampening water control method for controlling a dampening water supply amount using a dampening water management scale for managing the dampening water supply amount, wherein Is a first detection patch consisting of a single line or a halftone dot having an area ratio of 60% or more and an area ratio of 60% or more; A plate-making process for making a printing plate provided with a second detection patch comprising a halftone dot, a test printing process for printing with an appropriate supply amount of dampening water, using the printing plate made in the plate-making process; A combination of the area ratio of the first detection patch and the area ratio of the second detection patch so that the densities of the first detection patch and the second detection patch in the printed matter printed in the test printing process match. Certification process and actual printed pattern Both the printing step of printing the images of the first detection patch and the second detection patch having the area ratio certified in the certification step, the first detection patch printed in the printing step, and the second And a determination step of comparing the images of the detection patches to determine whether the supply amount of the dampening water is appropriate.

  The invention according to claim 12 is a dampening water control method for controlling a dampening water supply amount using a dampening water management scale for managing the dampening water supply amount, wherein Is a first detection patch consisting of a single line or a halftone dot having an area ratio of 60% or more and an area ratio of 60% or more; A plate-making process for making a printing plate provided with a second detection patch comprising a halftone dot, a test printing process for printing with an appropriate supply amount of dampening water, using the printing plate made in the plate-making process; A combination of the number of lines of the first detection patch and the number of lines of the second detection patch so that the densities of the first detection patch and the second detection patch coincide in the printed matter printed in the test printing process. With the certification process to certify and the actual printed pattern A printing process for printing images of the first detection patch and the second detection patch having the number of lines certified in the certification process, a first detection patch printed in the printing process, and a second And a determination step of comparing the images of the detection patches to determine whether the supply amount of the dampening water is appropriate.

  According to the first to fourth aspects of the present invention and the tenth to twelfth aspects of the present invention, by comparing the images of the first detection patch and the second detection patch, an inexperienced operator is provided. In addition, it is possible to easily determine whether the dampening water supply amount is appropriate or not visually.

  According to the fifth aspect of the present invention, the second detection patch can be easily visually confirmed.

  According to the sixth and seventh aspects of the present invention, it is possible to easily compare the first detection patch and the second detection patch.

  According to the eighth aspect of the present invention, it is possible to determine the suitability of the amount of dampening water supplied to the four color printing plates of yellow, magenta, cyan, and black.

  According to the invention described in claim 9, in determining whether or not the amount of dampening water supplied to the four-color printing plate of yellow, magenta, cyan, and black is appropriate, a yellow detection patch that is difficult to be recognized by the operator is provided. It becomes possible to compare as easy-to-recognize green, orange or dark yellow.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, a configuration of a printing machine that manages the supply amount of dampening water using the present invention will be described. FIG. 1 is a schematic side view of a printing machine that uses the present invention to manage the supply amount of dampening water.

  The printing machine records an image on a printing plate on which images held on the first and second plate cylinders 11 and 12 are not recorded, and then makes the ink supplied to the printing plate first, Printing on four colors is performed by transferring to the printing paper held by the first and second impression cylinders 15 and 16 via the second blanket cylinders 13 and 14.

  The printing press includes a first plate cylinder 11, a second plate cylinder 12, a first blanket cylinder 13 provided in contact with the first plate cylinder 11, and a second plate cylinder 12. A second blanket cylinder 14 provided so as to be able to contact, a first pressure cylinder 15 provided so as to be able to contact the first blanket cylinder 13, and a contact with the second blanket cylinder 14 The second impression cylinder 16 provided in a possible manner, the feed cylinder 17 for passing the printing paper supplied from the paper feeding unit 31 to the first impression cylinder 15, and the print received from the first impression cylinder 15. A transfer cylinder 18 for passing the sheet to the second impression cylinder 16 and a chain 23 for discharging the printing sheet received from the second impression cylinder 16 to the sheet discharge unit 32 are wound around the sprocket 22. In order to take an image printed on the paper discharge cylinder 19 and the printing paper and to measure the density of the detection patch Having an imaging unit 60, and a control panel 99 having a display screen 100 of the touch panel type which functions as an input means and display means.

  The first plate cylinder 11 and the second plate cylinder 12 are so-called double cylinders that hold printing plates for two different colors on the outer periphery thereof. The first blanket cylinder 13 and the second blanket cylinder 14 have the same diameter as the first plate cylinder 11 and the second plate cylinder 12, and each has a blanket surface on which images of two colors can be transferred. .

  A first impression cylinder 15 and a second impression cylinder 16 provided so as to be able to contact the first blanket cylinder 13 and the second blanket cylinder 14, respectively, 1. It has a diameter that is ½ of the diameter of the second blanket cylinder 13, 14. The first and second impression cylinders 15 and 16 have grippers (not shown) for holding and conveying the leading edge of the printing paper.

  A sheet feeding cylinder 17 disposed adjacent to the impression cylinder 15 has the same diameter as the first and second impression cylinders 15 and 16. For each rotation, the paper feed cylinder 17 holds and conveys the leading end portion of the printing paper supplied from the paper feed unit 31 by a gripper (not shown). The leading end of the printing paper held by the gripper is held by the gripper of the first pressure drum 15 when the printing paper is transferred from the paper feeding drum 17 to the first pressure drum 15.

  A transfer cylinder 18 disposed between the first impression cylinder 15 and the second impression cylinder 16 includes first and second plate cylinders 11 and 12 and first and second blanket cylinders 13 and 14. It has the same diameter as the diameter. The transfer cylinder 18 holds and conveys the leading end of the printing paper received from the first impression cylinder 15 by a gripper (not shown), and delivers the leading end of the printing paper to the gripper of the second impression cylinder 16.

  A paper discharge cylinder 19 disposed adjacent to the second impression cylinder 16 has the same diameter as that of the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14. Have. The paper discharge cylinder 19 has a structure in which a pair of chains 23 are wound around both ends thereof, and a gripper (not shown) is disposed on a connection member (not shown) that connects the pair of chains 23. The leading end portion of the printing paper held by the gripper of the second impression cylinder 16 is held by any of the grippers of the discharge cylinder 19 when the printing paper is transferred from the second impression cylinder 16 to the discharge cylinder 19. The The printing paper is discharged onto the paper discharge unit 32 as the chain 23 moves.

  A gear attached to the end of the paper feed cylinder 17 is connected to a gear 26 that is arranged concentrically with the driven pulley 25. A belt 29 is wound between a driving pulley 28 and a driven pulley 25 that are rotated by driving the printing motor 27. For this reason, the paper feed cylinder 17 is rotated by driving the drive printing motor 27. On the other hand, the first and second plate cylinders 11 and 12, the first and second blanket cylinders 13 and 14, the first and second impression cylinders 15 and 16, the paper feed cylinder 17, the transfer cylinder 18 and the paper discharge cylinder 19 are connected by the gear attached to the edge part, respectively. For this reason, by driving the drive printing motor 27, the paper feed cylinder 17, the first and second impression cylinders 15, 16, the paper discharge cylinder 19, the first and second blanket cylinders 13, 14, and the first The second plate cylinders 11 and 12 and the transfer cylinder 18 rotate in synchronization with each other.

  Around the first plate cylinder 11, an ink supply device 20a for supplying, for example, black (K) ink to the printing plate, and an ink supply device for supplying, for example, cyan (C) ink to the printing plate 20b and dampening water supply devices 21a and 21b for supplying dampening water to the printing plate are arranged. Further, around the second plate cylinder 12, an ink supply device 20c for supplying, for example, magenta (M) ink to the printing plate, and an ink for supplying, for example, yellow (Y) ink to the printing plate. A supply device 20d and dampening water supply devices 21c and 21d for supplying dampening water to the printing plate are arranged.

  Further, around the first plate cylinder 11 or the second plate cylinder 12, a plate feeding section 33 for supplying a printing plate to the outer peripheral portion of the first plate cylinder 11, and a second plate cylinder, respectively. A plate supplying unit 34 for supplying a printing plate to the outer peripheral portion of the first plate cylinder, an image recording device 35 for recording an image on the printing plate mounted on the outer peripheral portion of the first plate cylinder 11 based on image data, An image recording device 36 for recording an image on the printing plate mounted on the outer peripheral portion of the second plate cylinder 12 based on the image data is disposed.

  In the printing machine having the above configuration, the printing plate drawn out from the supply cassette 41 in the plate supply unit 33 is cut into a predetermined size by the cutter 42. Then, the leading end portion of the cut sheet-like printing plate is guided by a guide roller and a guide member (not shown), and is held by a holding claw of the first plate cylinder 11. Then, the first plate cylinder 11 is rotated at a low speed by driving a motor (not shown), the printing plate is wound around the outer peripheral portion of the first plate cylinder 11, and the rear end portion of the printing plate is held by the other holding nail. . In this state, while rotating the first plate cylinder 11 at a low speed, the image recording device 35 irradiates the surface of the printing plate held on the outer periphery of the first plate cylinder 11 with a modulated laser beam, Record.

  Similarly, the printing plate drawn out from the supply cassette 43 in the plate supply unit 34 is cut into a predetermined size by the cutter 44. Then, the leading end portion of the cut sheet-like printing plate is guided by a guide roller and a guide member (not shown), and is held by a holding claw of the second plate cylinder 12. Then, the second plate cylinder 12 is rotated at a low speed by driving a motor (not shown), the printing plate is wound around the outer periphery of the second plate cylinder 12, and the rear end portion of the printing plate is held by the other holding nail. . In this state, while rotating the second plate cylinder 12 at a low speed, the image recording device 36 irradiates the surface of the printing plate held on the outer periphery of the second plate cylinder 12 with a modulated laser beam, Record.

  A printing plate for printing with black ink and a printing plate for printing with cyan ink are mounted on the outer periphery of the first plate cylinder 11. These two printing plates are arranged at positions where they are evenly distributed (that is, separated from each other by 180 degrees), and the image recording device 35 records an image on these printing plates. Similarly, a printing plate for printing with magenta ink and a printing plate for printing with yellow ink are mounted on the outer periphery of the second plate cylinder 12. These two printing plates are also arranged at positions where they are equally distributed, and the image recording device 36 records an image on these printing plates, and the plate making process is completed.

  When the plate making process is completed, a printing process is performed in which printing is performed on printing paper using the printing plates on the first and second plate cylinders 11 and 12. This printing process is performed as follows.

  That is, first, each fountain solution supply device 21 and each ink supply device 20 are brought into contact only with the corresponding printing plates among the printing plates held on the first and second plate cylinders 11 and 12. Accordingly, the dampening water and the ink are supplied to each printing plate from the corresponding dampening water supply device 21 and the corresponding ink supply device 20. The ink supplied to the printing plate is transferred to corresponding areas of the first and second blanket cylinders 13 and 14.

  Then, the printing paper is supplied to the paper feed cylinder 17. This printing paper is delivered from the paper feed cylinder 17 to the first impression cylinder 15. When the first impression cylinder 15 that has received the printing paper continues to rotate, the first impression cylinder 15 has a diameter that is ½ that of the first plate cylinder 11 and the first blanket cylinder 13. On the printing paper held on the outer peripheral portion of one impression cylinder 15, black ink is transferred in the first rotation, and cyan ink is transferred in the second rotation.

  If the first impression cylinder 15 rotates twice, the printing paper is transferred from the first impression cylinder 15 via the transfer cylinder 18 to the second impression cylinder. When the second impression cylinder 16 that has received the printing paper continues to rotate, the second impression cylinder 16 has a diameter that is ½ that of the second plate cylinder 12 and the second blanket cylinder 14. On the printing paper held on the outer periphery of the second impression cylinder 16, magenta ink is transferred in the first rotation, and yellow ink is transferred in the second rotation.

  In this way, the leading end portion of the printing paper on which the printing of four colors has been completed is transferred from the second impression cylinder 16 to the discharge cylinder 19. Then, the printing paper on which the printing of the four colors has been completed is conveyed toward the paper discharge unit 28 by the drive of the pair of chains 23 and is discharged.

  When the printing process is completed, the printing plate used for printing is discharged. Then, the first and second blanket cylinders 13 and 14 are cleaned by a blanket cylinder cleaning device (not shown), and the printing process is completed.

  Next, a dampening water control method using the dampening water management scale according to the present invention in the above-described printing machine will be described. FIG. 2 is a schematic diagram showing the printing paper 200 on which the dampening water management scale P is printed together with the pattern 201.

  A plurality of dampening water management scales P are printed on the printing paper 200 corresponding to the areas R1 to R5 corresponding to the ink keys in the ink supply device 20 of the printing press.

  FIG. 3 is an explanatory view showing the dampening water management scale P. As shown in FIG.

  The dampening water management scale P includes a first detection patch PY1 printed with yellow ink, a second detection patch PY2 printed with yellow ink, and a first detection patch printed with magenta ink. Patch PM1, second detection patch PM2 printed with magenta ink, first detection patch PC1 printed with cyan ink, second detection patch PC2 printed with cyan ink, and black A first detection patch PK1 printed with a black ink, a second detection patch PK2 printed with a black ink, a first detection patch PG1 printed with a yellow and cyan ink, and yellow and cyan And a second detection patch PG2 printed with ink.

  FIG. 3A shows a case where the first detection patches PY1, PM1, PC1, PK1, and PG1 and the second detection patches PY2, PM2, PC2, PK2, and PG2 are arranged adjacent to each other. FIG. 3B shows a case where the first detection patches PY1, PM1, PC1, PK1, and PG1 are arranged adjacent to the inside of the second detection patches PY2, PM2, PC2, PK2, and PG2. Yes.

  The first detection patches PY1, PM1, PC1, and PK1 have 400 lines (the number of lines that can be drawn per inch and represents the resolution), and the area of the image portion relative to the total area. This is composed of a multiline patch (a patch composed of a multiline) having a duty ratio (area ratio) of 67%. The second detection patches PY2, PM2, PC2 and PK2 are composed of halftone patches (patches composed of halftone dots) whose number of lines is 150 and whose dot area ratio (area ratio) is 80%. Is done.

  On the other hand, the first detection patch PG1 has a dot area ratio of 10% printed with cyan ink on a multiline patch having 400 lines printed with yellow ink and a duty ratio of 67%. The uniform halftone dots are superimposed. The second detection patch PG2 has a dot area ratio of 10 printed with cyan ink on a dot patch with 150 lines printed with yellow ink and a dot area ratio of 80%. % Uniform halftone dots.

  As described above, the halftone dot area ratio may be set as appropriate as long as cyan ink having the same halftone dot area ratio is superimposed on the first detection patch PG1 and the second detection patch PG2. However, a low dot area ratio of about 10% is good for visual confirmation of the yellow density.

  For convenience of explanation, the description will be made assuming that the halftone dot area ratios of the second detection patches PY2, PM2, PC2, PK2, and PG2 are all 80%. However, this halftone dot area ratio actually differs for each color. It becomes.

  The dampening water management scale P is used for visually determining the suitability of the supply amount of the dampening water. That is, the first detection patch PY1 and the second detection patch PY2 are visually compared to determine whether the amount of dampening water supplied to the yellow printing plate is appropriate. The first detection patch PM1 and the second detection patch PY2 The detection patch PM2 is visually compared to determine whether the amount of dampening water supplied to the magenta printing plate is appropriate, and the first detection patch PC1 and the second detection patch PC2 are visually compared to cyan. The suitability of the amount of dampening water supplied to the printing plate is determined, and the suitability of the amount of dampening water supplied to the black printing plate is determined by visually comparing the first detection patch PK1 and the second detection patch PK2. Is determined.

  At this time, since it is difficult for the human eye to determine the density of the yellow ink, the first detection patch PG1 and the second detection patch PG2 that are mixed with yellow and cyan to obtain green are used. The suitability of the fountain solution for the yellow printing plate is determined. Instead of using green mixed with yellow and cyan, orange mixed with yellow and magenta, dark yellow mixed with yellow and black, or the like may be used.

  By comparing the first detection patches PY1, PM1, PC1, PK1, and PG1 with the second detection patches PY2, PM2, PC2, PK2, and PG2, the suitability of the dampening water supply can be determined. For the following reason.

  That is, the first detection patches PY1, PM1, PC1, PK1, and PG1 having a high number of lines have a large density change with respect to a change in the amount of dampening water supplied, whereas the second detection patches PY2 have a low number of lines. PM2, PC2, PK2, and PG2 have small changes in concentration with respect to changes in the amount of dampening water supplied. For this reason, the dot area ratio (area ratio) of the second detection patches PY2, PM2, PC2, PK2, and PG2 is larger than the duty ratio (area ratio) of the first detection patches PY1, PM1, PC1, PK1, and PG1. In addition, the first detection patch PY1, PM1, PC1, PK1, PG1 concentration and the second detection patch PY2, PM2, PC2, PK2, PG2 are approximately the same when the water amount is appropriate. By setting the duty ratio (area ratio) of one detection patch PY1, PM1, PC1, PK1, PG1 and the halftone dot area ratio (area ratio) of the second detection patch PY2, PM2, PC2, PK2, PG2, The first detection patch PY1, PM1, PC1, PK1, PG1 and the second detection patch PY2, PM2, PC2, PK2, PG2 are visually compared to determine whether the amount of dampening water supplied is appropriate. It can be constant.

  Hereinafter, a dampening water control method for determining the suitability of the supply amount of dampening water using the dampening water management scale P according to the present invention will be described.

  In order to determine the suitability of the fountain solution, the first detection patch PY1, PM1, PC1, PK1, PG1 and the second detection patch PY2, PM2, PC2, together with the pattern 201 are made on the printing plate during plate making. PK2 and PG2 are formed. That is, on the black printing plate, the first detection patch PK1 and the second detection patch PK2 are formed using the image recording device 35 shown in FIG. Similarly, for the printing plate of cyan color, the image recording device 35 is used, and the first detection patch PC1, the second detection patch PC2, the first detection patch PY1, and the second detection patch PY2. Are formed. Further, on the printing plate of magenta color, the first detection patch PM1 and the second detection patch PM2 are formed using the image recording device 36 shown in FIG. Similarly, the first detection patch PY1 and the second detection patch PY2 are formed on the yellow printing plate using the image recording device 36.

  At this time, the first detection patches PY1, PM1, PC1, and PK1 are all line patches having 400 lines and a duty ratio of 67%. On the other hand, the second detection patches PY2, PM2, PC2, and PK2 have a number of lines of 150, and a plurality of meshes whose dot area ratio changes by 1% in a range of 60% to 90%, for example. A point patch is formed.

  Next, test printing is performed using the printing plate after plate making. And the printing plate when the supply amount of dampening water becomes appropriate is confirmed visually.

  FIG. 4 is a graph schematically showing the relationship between the amount of dampening water supplied during printing (printing water amount) and the density of each detection patch.

  In this figure, the vertical axis indicates the density of the detection patch, and the horizontal axis indicates the amount of printing water. 0 on the horizontal axis indicates an appropriate amount of printing water. For example, the thick line indicates a change in the density of the first detection patch PK1, and the thin line indicates a change in the density of the second detection patch PK2. The thin lines indicate the change in density when the halftone dot area ratio of the second detection patch PM2 is 82%, 81%, 80%, 79%, and 78%, respectively.

  As described above, the first detection patch PK1 having a high number of lines has a large density change with respect to the change in the amount of dampening water supplied, whereas the second detection patch PK2 having a low number of lines supplies the dampening water. Small change in density with respect to change in quantity. In the case of this graph, when the halftone dot area ratio of the second detection patch PK2 is 80%, the first detection patch and the first detection patch when the supply amount of dampening water is appropriately controlled. The density of the two detection patches is substantially the same. Therefore, with this test printing, the duty of the first detection patch is such that the densities of the first detection patch PK1 and the second detection patch PK2 match when printing is performed with an appropriate supply amount of dampening water. A combination of the ratio and the dot area ratio of the second detection patch can be certified. This is the same for the other colors.

  In the above, the number of lines is fixed to 400 lines and 150 lines, but the density may be adjusted by changing the number of lines. That is, when the number of lines is relatively small, the concentration decreases as the amount of dampening water supplied increases, and the relationship between the amount of dampening water supplied and the concentration is linear, but the number of lines is relatively small. When it is large, there is a region where the concentration increases due to an increase in the fountain solution, and the relationship between the supply amount of the fountain solution and the concentration may be substantially U-shaped. For this reason, instead of adjusting the area ratio, the number of lines may be adjusted.

  In this case, as the second detection patches PY2, PM2, PC2, and PK2, test printing can be performed by forming a plurality of halftone patches whose number of lines sequentially changes in the range of 125 lines to 175 lines, for example. That's fine.

  FIG. 5 is a graph showing the relationship between the amount of dampening water supplied during printing (printing water amount) and the density of detection patches. From this graph, the number of lines is 400, the first detection patch PK1 is a single line with a duty ratio of 67%, the number of lines is 150, and the dot area ratio is 80%. It can be seen that the halftone dot detection patch PK2 has the same density when the amount of dampening water supplied is appropriate.

  Thus, the number of lines is 400, the first detection patch PK1 is a single line with a duty ratio of 67%, the number of lines is 150, and the dot area ratio is 80%. If it is recognized that the halftone dot detection patch PK2 has substantially the same density when the supply amount of dampening water is appropriate, this is the case when making a black color pattern for actual printing. First and second detection patches PK1, PK2 are formed simultaneously with the picture. This is the same for other colors, but the halftone dot area ratios of the second detection patches PY2, PM2, PC2, and PG2 at that time are different values for the respective colors as described above.

  The printed matter is actually printed, and the density of the first detection patches PY1, PM1, PC1, PK1, and PG1 and the density of the second detection patches PY2, PM2, PC2, PK2, and PG2 at that time are visually checked. Compare. At this time, if the density of the first detection patches PY1, PM1, PC1, PK1, and PG1 and the density of the second detection patches PY2, PM2, PC2, PK2, and PG2 coincide, It becomes possible to determine that the supply amount of salt water is appropriate.

  For the yellow color, it is possible to determine the suitability of the dampening water supply amount by comparing the first and second detection patches PY1, PY2. At this time, the green first and second detection patches PG1 and PG2 may be omitted. However, when it is difficult to visually determine yellow, the first and second detection patches PG1 and PG2 of green are used. In this case, the density of the first and second detection patches PG1 and PG2 depends on not only the yellow but also the supply amount of the cyan color dampening water. It is preferable to compare the concentrations of the first and second detection patches PG1, PG2 after the amount is determined to be appropriate.

  When comparing the detection patches described above, it is difficult to visually identify the density difference, but it is relatively easy to identify which density is higher or lower. Thereby, it can be determined whether the dampening water should be increased or decreased. In addition, the first detection patches PY1, PM1, PC1, PK1, and PG1 and the second detection patches PY2, PM2, PC2, PK2, and PG2 are as shown in FIGS. 3A and 3B. It is arranged adjacent to each other. Therefore, when using the first detection patches PY1, PM1, PC1, PK1, and PG1 and the second detection patches PY2, PM2, PC2, PK2, and PG2, the inexperienced operator It is possible to easily determine whether the amount of dampening water supplied is appropriate.

  In the above-described embodiment, the detection patch made of a line is used as the first detection patch PY1, PM1, PC1, PK1, PG1 for managing the supply amount of the dampening water. A patch may be adopted.

  In the above-described embodiment, detection patches made up of halftone dots are employed as the second detection patches PY2, PM2, PC2, PK2, and PG2. This is for the purpose of preventing the density from being difficult to confirm when the detection patch consisting of all the lines is used and the number of lines decreases and the lines become conspicuous at the time of visual confirmation. However, detection patches made of lines may be used as the second detection patches PY2, PM2, PC2, PK2, and PG2.

  The number of lines of the first detection patches PY1, PM1, PC1, PK1, and PG1 described above is preferably 200 lines or more and particularly preferably 300 lines or more in order to increase the density change with respect to the change in the printing water amount. . The duty ratio (area ratio) at that time is preferably 60% or more. Here, if the duty ratio is set to a low value of less than 60%, the change in the density with respect to the printing water amount becomes U-shaped in the graph shape shown in FIG. On the other hand, the number of lines of the second detection patches PY2, PM2, PC2, PK2, and PG2 described above is preferably less than 200 lines, more preferably 175 lines or less. This is because the second detection patches PY2, PM2, PC2, PK2, and PG2 reduce the change in density with respect to the change in the amount of printing water. When such a combination of detection patches is used, it is possible to appropriately determine whether or not the supply amount of the dampening water is appropriate by comparing the density by visual observation.

  In the above-described embodiment, the detection patches are arranged for each ink key area. However, if there is one set of detection patches for each color for at least one printing paper, it is possible to confirm the suitability of the amount of dampening water. However, it is preferable to provide detection patches at a plurality of positions along the print width direction, so that the suitability of the amount of dampening water can be confirmed with higher accuracy.

It is a side surface schematic diagram of a printing machine which manages supply_amount | feed_rate of dampening water using this invention. It is a schematic diagram showing a printing paper 200 on which a dampening water management scale P is printed together with a pattern 201. It is explanatory drawing which shows the dampening water management scale P. FIG. It is a graph which shows typically the relation between the supply amount of dampening water at the time of printing, and the concentration of each detection patch. It is a graph which shows the relationship between the supply amount of the dampening water at the time of printing, and the density | concentration of a detection patch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 1st printing cylinder 12 2nd printing cylinder 13 1st blanket cylinder 14 2nd blanket cylinder 15 1st impression cylinder 16 2nd impression cylinder 17 Paper feed cylinder 18 Transfer cylinder 19 Paper discharge cylinder 20 Ink supply Device 21 Dampening water supply device 22 Sprocket 23 Chain 27 Printing motor 31 Paper feed portion 32 Paper discharge portion 33 Plate feeding portion 34 Plate feeding portion 35 Image recording device 36 Image recording device 99 Control panel P Dampening water management scale PY1 1 detection patch PY2 second detection patch PM1 first detection patch PM2 second detection patch PC1 first detection patch PC2 second detection patch PK1 first detection patch PK2 second detection patch PG1 first detection patch Detection patch PG2 Second detection patch

Claims (12)

A dampening water management scale for managing the amount of dampening water supplied,
A first detection patch comprising a single line or halftone dot having a line number of 200 lines or more and an area ratio of 60% or more;
A second detection patch comprising lines or halftone dots having a number of lines smaller than that of the first detection patch and an area ratio larger than that of the first detection patch;
A dampening water management scale characterized in that when the supply amount of dampening water is appropriately controlled, the first detection patch and the second detection patch have substantially the same concentration. In the dampening water management scale according to claim 1,
When the supply amount of dampening water is appropriately controlled, the first detection patch and the first detection patch are arranged so that the density of the first detection patch is substantially the same as that of the second detection patch. The area ratio or the number of lines of the second detection patch is adjusted. In the dampening water management scale according to claim 2,
A dampening water management scale in which the number of lines of the first detection patch is 300 or more. In the dampening water management scale according to claim 2,
A dampening water management scale in which the number of lines of the second detection patch is less than 200 lines. In the dampening water management scale according to any one of claims 2 to 4,
The first detection patch is a fountain solution management scale comprising a line, and the second detection patch is a halftone dot. In the dampening water management scale according to any one of claims 2 to 5,
A dampening water management scale in which the first detection patch and the second detection patch are arranged adjacent to each other. The dampening water management scale according to claim 6,
A dampening water management scale in which one of the first detection patch and the second detection patch is disposed adjacent to the inside of the other. In the dampening water management scale according to claim 6 or 7,
The first detection patch and the second detection patch are dampening water management scales disposed adjacent to each other of yellow, magenta, cyan, and black. In the dampening water management scale according to claim 8,
A dampening water management scale in which a halftone image of cyan, magenta or black having the same halftone dot area ratio is printed on the first yellow detection patch and the second yellow detection patch, respectively. . A dampening water control method using the dampening water management scale according to any one of claims 1 to 9,
A printing process for printing an image of the dampening water management scale according to any one of claims 1 to 8,
A determination step of comparing the images of the first detection patch printed in the printing step and the second detection patch to determine whether the amount of dampening water supplied is appropriate;
A dampening water control method characterized by comprising: A dampening water control method for controlling dampening water supply using a dampening water management scale for managing dampening water supply,
A first detection patch composed of lines or halftone dots having a line number of 200 lines or more and an area ratio of 60% or more, and a line number smaller than the first detection patch and an area larger than the first detection patch. A plate making process for making a printing plate provided with a second detection patch comprising a line or a halftone dot; and
Using the printing plate made in the plate making process, a test printing process for printing with an appropriate supply amount of dampening water,
The area ratio of the first detection patch and the area ratio of the second detection patch such that the densities of the first detection patch and the second detection patch coincide in the printed matter printed in the test printing step. A certification process to certify the combination;
A printing process for printing an image of the first detection patch and the second detection patch having an area ratio certified in the certification process, along with an actual print pattern,
A determination step of comparing the images of the first detection patch and the second detection patch printed in the printing step to determine the suitability of the amount of dampening water supplied;
A dampening water control method characterized by comprising: A dampening water control method for controlling dampening water supply using a dampening water management scale for managing dampening water supply,
A first detection patch composed of lines or halftone dots having a line number of 200 lines or more and an area ratio of 60% or more, and a line number smaller than the first detection patch and an area larger than the first detection patch. A plate making process for making a printing plate provided with a second detection patch comprising a line or a halftone dot; and
Using the printing plate made in the plate making process, a test printing process for printing with an appropriate supply amount of dampening water,
The number of lines of the first detection patch and the number of lines of the second detection patch such that the densities of the first detection patch and the second detection patch in the printed matter printed in the test printing step match. A certification process to certify the combination;
A printing step of printing an image of the first detection patch and the second detection patch having the number of lines certified in the certification step together with an actual printed matter pattern;
A determination step of comparing the images of the first detection patch and the second detection patch printed in the printing step to determine the suitability of the amount of dampening water supplied;
A dampening water control method characterized by comprising:

Images