CN113858842A - High-quality printing method of flexographic printing machine capable of controlling printing quality - Google Patents
High-quality printing method of flexographic printing machine capable of controlling printing quality Download PDFInfo
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- CN113858842A CN113858842A CN202111098604.0A CN202111098604A CN113858842A CN 113858842 A CN113858842 A CN 113858842A CN 202111098604 A CN202111098604 A CN 202111098604A CN 113858842 A CN113858842 A CN 113858842A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/02—Letterpress printing, e.g. book printing
- B41M1/04—Flexographic printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
Abstract
The invention discloses a high-quality printing method of a flexographic printing machine capable of controlling printing quality, which comprises the following steps: step 1: designing a network reproduction monitoring icon; overprinting the monitoring icons and typesetting; step 2: manufacturing flexible printing plates with various colors; the flexible printing plates of all colors comprise pictures and texts to be printed; also includes a network reproduction monitoring icon; and overprinting the monitoring icon; and step 3: mounting the flexible printing plates of various colors on the printing plate cylinders of the corresponding printing units; and 4, step 4: detecting paper smoothness; and 5: pre-printing; step 6: after the pre-printing is judged to be qualified, normal printing is carried out; the printing speed is 220 m/min; the interval in the printing process is 30 min; repeating the step 5; the application realizes the digital detection standard, judges more accurately and reliably than the naked eyes of workers, can rapidly and accurately identify the printing quality problem in the printing process, corrects in time, and prevents the printing accident caused by the inflow of the next link.
Description
Technical Field
The invention relates to the technical field of printing, in particular to a high-quality printing method of a flexographic printing machine, which can control the printing quality.
Background
In recent years, the level of prepress and printing automation of packaging and printing enterprises is continuously improved, a great deal of manpower is liberated, and a great deal of manpower is still relied on in the quality detection link. With the improvement of the requirements of the terminal market on the packaging quality and the delivery cycle and the increasing annual domestic labor cost, the quality detection system is favored by the packaging and printing enterprises.
The flexographic printing process is widely applied due to the advantages of health, environmental protection, high efficiency, energy conservation, low cost and the like; flexography is the use of an anilox roller to ink an elastomeric resin relief plate. Then transferring the printing ink to the surface of a printing stock; however, since the resin material has a certain elasticity, too large printing will cause excessive deformation of the resin material, so that the deformation of the printed dots is enlarged, and even some larger dots are directly pasted into one piece, which causes serious distortion of the pattern. Therefore, the printing pressure must be strictly controlled within a reasonable range. However, a standard printing pressure control method is lacked in the industry at present, more users operate and control the printing press according to the starting experience of a printing manipulator, the experience talks are difficult to speak and quantify, technical inheritance and staff training are not facilitated, the skill levels of the printing manipulator are different, the scale is grasped differently, and the difference of the quality of final products is easily caused. Patent numbers: 201620891463.6, a flexographic printing machine capable of controlling printing quality, which comprises a host, an unreeling feeding part, a printing part, a post-processing part and a rewinding receiving part which are sequentially arranged, wherein the unreeling feeding part comprises a material placing unit and a tension control unit, the printing part) comprises a plurality of color sets, each color set is internally provided with a drying unit, the flexographic printing machine further comprises a first quality detection unit, a second quality detection unit and a receiving switching unit, the first quality detection unit is arranged between the printing part and the post-processing part, the second quality detection unit is arranged between the post-processing part and the rewinding receiving part, and the first quality detection unit and the second quality detection unit are respectively in communication connection with the host; the rewinding receives the material portion including receiving material reel and waste material reel, receive material switch unit and can transmit the seal to receiving material reel or waste material reel, receive material switch unit and host computer communication connection, the online quality detection of specific flexography can't be realized to this structure, including site enlargement and overprinting etc..
Disclosure of Invention
The present invention is directed to a high-quality printing method of a flexographic printing machine capable of controlling printing quality, which solves the above-mentioned problems of the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a high-quality printing method of a flexographic printing machine capable of controlling printing quality comprises the following steps:
step 1: designing a network reproduction monitoring icon; overprinting the monitoring icon, and reproducing the monitoring icon from the website; overprinting the monitoring icon and the image-text to be printed for typesetting;
step 2: manufacturing flexible printing plates with various colors; the flexible printing plates of all colors comprise pictures and texts to be printed; also includes a network reproduction monitoring icon; and overprinting the monitoring icon;
and step 3: mounting the flexible printing plates of various colors on the printing plate cylinders of the corresponding printing units;
and 4, step 4: detecting paper smoothness;
and 5: pre-printing;
(1) the printing speed is 20 m/min; the printing device comprises n groups of printing units, wherein a first image acquisition unit is arranged behind the nth group of printing units along the paper conveying direction; the first image acquisition unit is used for shooting the surface of the printed and output paper, and stopping to acquire a network point reproduction monitoring icon and an overprint monitoring icon image if the surface of the paper is detected to have printing pictures and texts;
(2) identifying a complete set of site rendering monitor icons; if the abnormal condition is found, an alarm is given out, and the abnormal condition is judged; the reason is convenient for the staff to check;
(3) judging whether the dots of each color have dot amplification or not;
(4) identifying a set of overprint monitor icon images;
(5) judging whether the overprint is inaccurate; if the abnormal condition is found, an alarm is given out, and the abnormal condition is judged; the reason is convenient for the staff to check;
step 6: after the pre-printing is judged to be qualified, normal printing is carried out; the printing speed is 220 m/min; the interval in the printing process is 30 min; and (5) repeating the step.
Preferably, the flexographic printing plates of all colors are correspondingly provided with independent dot reproduction monitoring icons; and the reproduction monitoring icons of the various color dots are arranged at equal intervals to form reproduction monitoring icon groups of the various color dots; the paper comprises a plurality of halftone reproduction monitoring icon groups of various colors, wherein the plurality of halftone reproduction monitoring icon groups of various colors are arranged along the longitudinal direction of the paper; the distance between the plurality of the halftone dot reproduction monitoring icon groups of each color is larger than that between the single halftone dot reproduction monitoring icons, wherein the halftone dot reproduction monitoring icons are circular icons which are radially arranged by a plurality of equilateral triangles with vertexes as circle centers, the distance between two adjacent equilateral triangles is gradually increased from the circle centers outwards, and the overprint monitoring icons are cross overprint icons; the transverse width and the longitudinal width of the cross overprint icon are gradually reduced from the center to the two ends; the overprint monitoring icons are arranged between two adjacent color dot reproduction monitoring icon groups.
Preferably, the method for identifying a complete set of halftone reproduction monitoring icons in step (2) includes the following steps:
a1: taking a picture of the picture and text on the surface of the shot paper; searching a first mark line as a first reference line; adjusting the first datum line to be vertically arranged;
a2: searching a second marking line from the first reference line to the left or the right as a second reference line; if the second reference line is not found, returning to the step A1; until a second marker line is found;
a3: a transverse target area is formed between the second datum line and the first datum line;
a4: in the transverse target area, a halftone reproduction monitoring icon is searched as a reference icon, the reference icon is used as a reference point, a first halftone reproduction monitoring icon adjacent to the reference icon is obtained along the vertical upward direction, and the distance between the adjacent first halftone reproduction monitoring icon and the reference icon is calculated as D1; continuously obtaining a second website reproduction monitoring icon adjacent to the first website reproduction monitoring icon; and calculating the distance between the second halftone reproduction monitoring icon and the first halftone reproduction monitoring icon as D2; by analogy, D1 and D2 … … D are obtainednWhen D is presentnIs much greater than Dn-1(ii) a Then the spacing distance is taken as DnThe center line between two adjacent halftone reproduction monitoring icons is used as a third datum line;
a5: obtaining a fourth reference line of the reference icon vertically downward in the same way as the step A4;
a6: and obtaining a group of complete halftone reproduction monitoring icons by taking the first datum line, the second datum line, the third datum line and the fourth datum line as boundary lines.
Preferably, the method for judging whether the halftone dots of each color have halftone dot amplification in the step (3) includes the following steps;
s1: a group of complete network points are taken to reproduce monitoring icon images; converting the image into a gray scale image;
s2: taking the third datum line as an X axis, obtaining a center point between the first datum line and the second datum line on the third datum line, and establishing a Y axis perpendicular to the center point;
s3: the central point position of the monitoring icon image is reproduced according to preset dots of various colors; obtaining gray value G of the central point position of the net point reproduction monitoring icon image corresponding to each color0Taking the central point as the center of a circle and radiating outwards in a circle to obtain the gray value Gn of the rest positions, if G is0-Gn is greater than or equal to 10, marking the point, otherwise discarding the point; stopping calculation until the points marked in the circumferential direction are distributed in a point shape, and showing that the dot expanded area in the middle part is marked at the moment;
s4: if Gn is greater than G0Taking the point with the gray value Gn as a new central point position again, taking the new central point as a circle center, radiating outwards in a circle to obtain the gray value Gn of other positions, and repeating the step S3; marking the middle mesh point expanded area;
s5: and comparing the marked middle dot expanded areas with the standard icons, and judging whether the dot expansion of the middle dot expanded areas corresponding to the icons of all colors is within a preset threshold value.
Preferably, the determining whether there is an overprint misalignment includes the steps of:
h1: obtaining a cross overprint icon at the third reference line or the fourth reference line;
h2: superposing the central point of the cross overprint icon and the central point of the standard cross overprint icon and then carrying out 'AND' operation;
h3: reading the RGB values of the image pixels in step H2; and judging which printing plate is inaccurate in overprinting according to the RGB values of the obtained pixels.
Preferably, the method for detecting the smoothness of the paper in the step 4 comprises the following sub-steps:
e1: installing a PPS roughness tester at the forefront end of paper conveying; the width of the paper clamping table top of the PPS roughness tester is larger than the transverse width of the paper;
e2: reducing the conveying tension of paper at the paper output end;
e3: the PPS roughness tester moves along the paper conveying direction through the moving device, and the moving speed of the PPS roughness tester is the same as the paper conveying speed;
e4: clamping the paper to be measured by a clamping platform of the PPS roughness tester to finish the measurement of the roughness of the paper at the part;
e5: the PPS roughness tester returns to the initial position, and the step E4 is repeated to continue to carry out roughness detection on the conveyed paper;
e5: repeating steps E4 through E5; obtaining a plurality of groups of roughness data (R1, R2 … … Rn); obtaining average roughness Rt ═ (R1+ R2 … … Rn)/n;
e6: comparing the average roughness Rt with a system preset roughness R0; judging whether the average roughness Rt is within a preset threshold value; if the alarm exceeds the preset threshold, an abnormal alarm is sent out for the reference of an operator;
e7: and if the average roughness Rt is within a preset threshold value, adjusting the conveying tension of the paper at the paper output end to an initial value.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a high-quality printing method of a flexible printing machine, which can control the printing quality, and adopts pre-printing to judge the quality conditions of screen dots and overprinting during printing; meanwhile, the characters of the printed paper are monitored before printing, when the printing quality problem occurs, the paper quality is often neglected, the paper character monitoring is set, the problem can be found earlier, in a word, the digital detection standard is realized, the problem is more accurate and reliable than the judgment of workers by naked eyes, the printing quality problem in the printing process can be rapidly and accurately identified, the correction is timely carried out, and the printing accident is prevented from flowing into the next link.
Drawings
FIG. 1 is a schematic view of a halftone dot reproduction monitoring icon structure according to the present invention;
FIG. 2 is a schematic diagram of a structure of an overprint monitor icon image according to the present invention;
FIG. 3 is a schematic diagram of the arrangement structure of the halftone reproduction monitoring icons and the overprint monitoring icon images on the paper according to the present invention;
FIG. 4 is a schematic structural diagram of the enlarged structural diagram of FIG. 3A;
fig. 5 is a schematic structural diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1-5, the present invention provides a technical solution:
a high-quality printing method of a flexographic printing machine capable of controlling printing quality comprises the following steps:
step 1: designing a network reproduction monitoring icon; overprinting the monitoring icon, and reproducing the monitoring icon from the website; overprinting the monitoring icon and the image-text to be printed for typesetting;
step 2: manufacturing flexible printing plates with various colors; the flexible printing plates of all colors comprise pictures and texts to be printed; also includes a network reproduction monitoring icon; and overprinting the monitoring icon;
and step 3: mounting the flexible printing plates of various colors on the printing plate cylinders of the corresponding printing units;
and 4, step 4: detecting paper smoothness;
and 5: pre-printing;
(1) the printing speed is 20 m/min; includes n sets of printing units, and a first image acquisition unit 550 is provided behind the nth set of printing units in the sheet conveying direction; the first image acquisition unit is used for shooting the surface of the printed and output paper, and stopping to acquire a network point reproduction monitoring icon and an overprint monitoring icon image if the surface of the paper is detected to have printing pictures and texts;
(2) identifying a complete set of site rendering monitor icons; if the abnormal condition is found, an alarm is given out, and the abnormal condition is judged; the reason is convenient for the staff to check;
(3) judging whether the dots of each color have dot amplification or not;
(4) identifying a set of overprint monitor icon images;
(5) judging whether the overprint is inaccurate; if the abnormal condition is found, an alarm is given out, and the abnormal condition is judged; the reason is convenient for the staff to check;
step 6: after the pre-printing is judged to be qualified, normal printing is carried out; the printing speed is 220 m/min; the interval in the printing process is 30 min; repeating the step 5; detecting the quality of a printed product in printing; so as to ensure the quality of the printed matter in the whole printing process;
the flexible printing plates of all colors are correspondingly provided with independent dot reproduction monitoring icons; each printing plate corresponds to an independent network point reproduction monitoring icon; and the reproduction monitoring icons of the various color dots are arranged at equal intervals to form reproduction monitoring icon groups of the various color dots; for example, if it is a CMYK four-color printing; the CMYK printing plates are respectively provided with a one-dot reproduction monitoring icon; after printing on paper, forming a CMYK four-color dot reproduction monitoring icon; a group of CMYK four-color dot reproduction monitoring icons are used as a monitoring unit;
the paper monitoring device comprises a plurality of monitoring units formed by a plurality of halftone reproduction monitoring icon groups of various colors, wherein the plurality of halftone reproduction monitoring icon groups of various colors are arranged along the longitudinal direction of paper; the distance between the plurality of halftone dot reproduction monitoring icon groups of all colors is larger than the distance between the independent halftone dot reproduction monitoring icons, so that the design is convenient for acquiring halftone dot reproduction monitoring icon images in the subsequent image identification process;
the mesh point reappearing monitoring icon is a circular icon which is formed by radially arranging a plurality of equilateral triangles by taking the vertexes of the equilateral triangles as the circle centers, the distance between two adjacent equilateral triangles is gradually increased from the circle center to the outside, and the distance between the triangles is the closest at the center of the structural icon; therefore, when the dot is enlarged, the adjacent triangles are easy to be connected, and the central point forms a black dot; the visual effect is stronger;
the overprint monitoring icon is a cross overprint icon; the transverse width and the longitudinal width of the cross overprint icon are gradually reduced from the center to the two ends; the same reasoning is adopted; the transverse width and the longitudinal width of the cross overprinting icon are gradually reduced from the center to the two ends, so that if overprinting is not accurate after overprinting; it is easier to distinguish with the naked eye.
The overprint monitoring icons are arranged between two adjacent color dot reproduction monitoring icon groups. And the overprint monitoring icons are designed on a central line between two reproduced monitoring icon groups of color dots when typesetting; and the overprint monitoring icon image can be conveniently acquired at the later stage.
The method for identifying a group of complete website reproduction monitoring icons in the step (2) comprises the following steps:
a1: taking a picture of the picture and text on the surface of the shot paper; searching a first mark line as a first reference line 100; adjusting the first datum line to be vertically arranged;
a2: searching a second mark line from the first reference line to the left or the right as a second reference line 110; if the second reference line is not found, returning to the step A1; until a second marker line is found;
a3: a transverse target area 111 is formed between the second datum line and the first datum line;
a4: in the transverse target area, a halftone reproduction monitoring icon is searched as a reference icon, the reference icon is used as a reference point, a first halftone reproduction monitoring icon adjacent to the reference icon is obtained along the vertical upward direction, and the distance between the adjacent first halftone reproduction monitoring icon and the reference icon is calculated as D1; continuously obtaining a second website reproduction monitoring icon adjacent to the first website reproduction monitoring icon; and calculating the distance between the second halftone reproduction monitoring icon and the first halftone reproduction monitoring icon as D2; by analogy, D1 and D2 … … D are obtainednWhen D is presentnIs much greater than Dn-1(ii) a Then take the separation distance asDnThe center line between two adjacent halftone dot reproduction monitoring icons is used as a third datum line 120;
a5: obtaining a fourth reference line 130 of the reference icon facing vertically downwards in the same way as in the step a 4;
a6: and obtaining a group of complete halftone reproduction monitoring icons by taking the first datum line, the second datum line, the third datum line and the fourth datum line as boundary lines.
The method for judging whether the dot amplification exists in the dots of each color in the step (3) comprises the following steps;
s1: taking a group of complete website reproduction monitoring icon images obtained in the step A6; converting the image into a gray scale image;
s2: taking the third datum line as an X axis, obtaining a center point between the first datum line and the second datum line on the third datum line, and establishing a Y axis perpendicular to the center point;
s3: the central point position of the monitoring icon image is reproduced according to preset dots of various colors; that is, in the plate making process, the coordinate position of each color preset halftone reproduction monitoring icon in the coordinate system of step S2 is preset; therefore, the position of the central point of the icon image can be quickly obtained according to the preset coordinate value;
obtaining gray value G of the central point position of the net point reproduction monitoring icon image corresponding to each color0Taking the central point as the center of a circle and radiating outwards in a circle to obtain the gray value Gn of the rest positions, if G is0-Gn is greater than or equal to 10, marking the point, otherwise discarding the point; stopping calculation until the points marked in the circumferential direction are distributed in a point shape, and showing that the dot expanded area in the middle part is marked at the moment;
s4: if Gn is greater than G0Taking the point with the gray value Gn as a new central point position again, taking the new central point as a circle center, radiating outwards in a circle to obtain the gray value Gn of other positions, and repeating the step S3; marking the middle mesh point expanded area;
s5: and comparing the marked middle dot expanded areas with the standard icons, and judging whether the dot expansion of the middle dot expanded areas corresponding to the icons of all colors is within a preset threshold value.
Judging whether the overprint is inaccurate or not, comprising the following steps:
h1: obtaining a cross overprint icon at the third reference line or the fourth reference line;
h2: superposing the central point of the cross overprint icon and the central point of the standard cross overprint icon and then carrying out 'AND' operation;
h3: reading the RGB values of the image pixels in step H2; and judging which printing plate is inaccurate in overprinting according to the RGB values of the obtained pixels.
Preferably, the method for detecting the smoothness of the paper in the step 4 comprises the following sub-steps:
e1: installing a PPS roughness tester at the forefront end of paper conveying; the width of the paper clamping table top of the PPS roughness tester is larger than the transverse width of the paper;
e2: reducing the conveying tension of paper at the paper output end;
e3: the PPS roughness tester moves along the paper conveying direction through the moving device, and the moving speed of the PPS roughness tester is the same as the paper conveying speed;
e4: clamping the paper to be measured by a clamping platform of the PPS roughness tester to finish the measurement of the roughness of the paper at the part;
e5: the PPS roughness tester returns to the initial position, and the step E4 is repeated to continue to carry out roughness detection on the conveyed paper;
e5: repeating steps E4 through E5; obtaining a plurality of groups of roughness data (R1, R2 … … Rn); obtaining average roughness Rt ═ (R1+ R2 … … Rn)/n;
e6: comparing the average roughness Rt with a system preset roughness R0; judging whether the average roughness Rt is within a preset threshold value; if the alarm exceeds the preset threshold, an abnormal alarm is sent out for the reference of an operator;
e7: and if the average roughness Rt is within a preset threshold value, adjusting the conveying tension of the paper at the paper output end to an initial value.
Wherein the PPS roughness tester is a commercial product; a paper conveying end of the flexo printing machine is provided with a mounting plate, a first servo motor 500 is arranged on the mounting plate, the first servo motor is connected with a PPS roughness tester host 502 through a first nut 501, and the PPS roughness tester is driven to move left and right through the servo motor; a clamping seat 503 is arranged right below the PPS roughness tester host, the clamping seat is connected with a second servo motor 504, the second servo motor drives the clamping seat to move left and right, and a clamping head 505 capable of lifting up and down is arranged on the clamping seat, which is the prior art and is not described herein again;
the paper output tension adjusting mechanism comprises a tension adjusting roller 506, and the tension of the paper is adjusted through the up-down position of the tension adjusting roller; this is the prior art and is not described herein again;
although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A high-quality printing method of a flexographic printing machine capable of controlling printing quality is characterized in that: the method comprises the following steps:
step 1: designing a network reproduction monitoring icon; overprinting the monitoring icon, and reproducing the monitoring icon from the website; overprinting the monitoring icon and the image-text to be printed for typesetting;
step 2: manufacturing flexible printing plates with various colors; the flexible printing plates of all colors comprise pictures and texts to be printed; also includes a network reproduction monitoring icon; and overprinting the monitoring icon;
and step 3: mounting the flexible printing plates of various colors on the printing plate cylinders of the corresponding printing units;
and 4, step 4: detecting paper smoothness;
and 5: pre-printing;
(1) the printing speed is 20 m/min; the printing device comprises n groups of printing units, wherein a first image acquisition unit is arranged behind the nth group of printing units along the paper conveying direction; the first image acquisition unit is used for shooting the surface of the printed and output paper, and stopping to acquire a network point reproduction monitoring icon and an overprint monitoring icon image if the surface of the paper is detected to have printing pictures and texts;
(2) identifying a complete set of site rendering monitor icons; if the abnormal condition is found, an alarm is given out, and the abnormal condition is judged; the reason is convenient for the staff to check;
(3) judging whether the dots of each color have dot amplification or not;
(4) identifying a set of overprint monitor icon images;
(5) judging whether the overprint is inaccurate; if the abnormal condition is found, an alarm is given out, and the abnormal condition is judged; the reason is convenient for the staff to check;
step 6: after the pre-printing is judged to be qualified, normal printing is carried out; the printing speed is 220 m/min; the interval in the printing process is 30 min; and (5) repeating the step.
2. A high-quality printing method of a flexographic printing machine capable of controlling printing quality according to claim 1, characterized in that: the flexible printing plates of all colors are correspondingly provided with independent dot reproduction monitoring icons; and the reproduction monitoring icons of the various color dots are arranged at equal intervals to form reproduction monitoring icon groups of the various color dots; the paper comprises a plurality of halftone reproduction monitoring icon groups of various colors, wherein the plurality of halftone reproduction monitoring icon groups of various colors are arranged along the longitudinal direction of the paper; the distance between the plurality of the halftone dot reproduction monitoring icon groups of each color is larger than that between the single halftone dot reproduction monitoring icons, wherein the halftone dot reproduction monitoring icons are circular icons which are radially arranged by a plurality of equilateral triangles with vertexes as circle centers, the distance between two adjacent equilateral triangles is gradually increased from the circle centers outwards, and the overprint monitoring icons are cross overprint icons; the transverse width and the longitudinal width of the cross overprint icon are gradually reduced from the center to the two ends; the overprint monitoring icons are arranged between two adjacent color dot reproduction monitoring icon groups.
3. A high-quality printing method of a flexographic printing machine capable of controlling printing quality according to claim 1 or 2, characterized in that: the method for identifying a group of complete website reproduction monitoring icons in the step (2) comprises the following steps:
a1: taking a picture of the picture and text on the surface of the shot paper; searching a first mark line as a first reference line; adjusting the first datum line to be vertically arranged;
a2: searching a second marking line from the first reference line to the left or the right as a second reference line; if the second reference line is not found, returning to the step A1; until a second marker line is found;
a3: a transverse target area is formed between the second datum line and the first datum line;
a4: in the transverse target area, a halftone reproduction monitoring icon is searched as a reference icon, the reference icon is used as a reference point, a first halftone reproduction monitoring icon adjacent to the reference icon is obtained along the vertical upward direction, and the distance between the adjacent first halftone reproduction monitoring icon and the reference icon is calculated as D1; continuously obtaining a second website reproduction monitoring icon adjacent to the first website reproduction monitoring icon; and calculating the distance between the second halftone reproduction monitoring icon and the first halftone reproduction monitoring icon as D2; by analogy, D1 and D2 … … D are obtainednWhen D is presentnIs much greater than Dn-1(ii) a Then the spacing distance is taken as DnThe center line between two adjacent halftone reproduction monitoring icons is used as a third datum line;
a5: obtaining a fourth reference line of the reference icon vertically downward in the same way as the step A4;
a6: and obtaining a group of complete halftone reproduction monitoring icons by taking the first datum line, the second datum line, the third datum line and the fourth datum line as boundary lines.
4. A high-quality printing method of a flexographic printing machine capable of controlling printing quality according to claim 3, characterized in that: the method for judging whether the dot amplification exists in the dots of each color in the step (3) comprises the following steps;
s1: a group of complete network points are taken to reproduce monitoring icon images; converting the image into a gray scale image;
s2: taking the third datum line as an X axis, obtaining a center point between the first datum line and the second datum line on the third datum line, and establishing a Y axis perpendicular to the center point;
s3: the central point position of the monitoring icon image is reproduced according to preset dots of various colors; obtaining gray value G of the central point position of the net point reproduction monitoring icon image corresponding to each color0Taking the central point as the center of a circle and radiating outwards in a circle to obtain the gray value Gn of the rest positions, if G is0-Gn is greater than or equal to 10, marking the point, otherwise discarding the point; stopping calculation until the points marked in the circumferential direction are distributed in a point shape, and showing that the dot expanded area in the middle part is marked at the moment;
s4: if Gn is greater than G0Taking the point with the gray value Gn as a new central point position again, taking the new central point as a circle center, radiating outwards in a circle to obtain the gray value Gn of other positions, and repeating the step S3; marking the middle mesh point expanded area;
s5: and comparing the marked middle dot expanded areas with the standard icons, and judging whether the dot expansion of the middle dot expanded areas corresponding to the icons of all colors is within a preset threshold value.
5. A high-quality printing method of a flexographic printing machine capable of controlling printing quality according to claim 3, characterized in that: judging whether the overprint is inaccurate or not, comprising the following steps:
h1: obtaining a cross overprint icon at the third reference line or the fourth reference line;
h2: superposing the central point of the cross overprint icon and the central point of the standard cross overprint icon and then carrying out 'AND' operation;
h3: reading the RGB values of the image pixels in step H2; and judging which printing plate is inaccurate in overprinting according to the RGB values of the obtained pixels.
6. A high-quality printing method of a flexographic printing machine capable of controlling printing quality according to claim 1, characterized in that: the method for detecting the smoothness of the paper in the step 4 comprises the following substeps:
e1: installing a PPS roughness tester at the forefront end of paper conveying; the width of the paper clamping table top of the PPS roughness tester is larger than the transverse width of the paper;
e2: reducing the conveying tension of paper at the paper output end;
e3: the PPS roughness tester moves along the paper conveying direction through the moving device, and the moving speed of the PPS roughness tester is the same as the paper conveying speed;
e4: clamping the paper to be measured by a clamping platform of the PPS roughness tester to finish the measurement of the roughness of the paper at the part;
e5: the PPS roughness tester returns to the initial position, and the step E4 is repeated to continue to carry out roughness detection on the conveyed paper;
e5: repeating steps E4 through E5; obtaining a plurality of groups of roughness data (R1, R2 … … Rn); obtaining average roughness Rt ═ (R1+ R2 … … Rn)/n;
e6: comparing the average roughness Rt with a system preset roughness R0; judging whether the average roughness Rt is within a preset threshold value; if the alarm exceeds the preset threshold, an abnormal alarm is sent out for the reference of an operator;
e7: and if the average roughness Rt is within a preset threshold value, adjusting the conveying tension of the paper at the paper output end to an initial value.
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