CN113910792B - Overprinting method of satellite type flexographic printing machine - Google Patents
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- 238000010276 construction Methods 0.000 abstract 1
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- 238000007774 anilox coating Methods 0.000 description 1
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
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Abstract
The invention discloses an overprinting method of a satellite type flexo printing machine, which belongs to the technical field of flexo printing and comprises preprinting, a construction formula and formal printing.
Description
Technical Field
The invention relates to the technical field of flexographic printing, in particular to a chromatography method of a satellite type flexographic printing machine.
Background
Flexographic printing machines can be classified into a stack type, a satellite type and a unit type according to the arrangement of printing portions. The printing units of the satellite flexographic printing machine are arranged between two wall plates and surround a common impression cylinder, and the printing materials are subjected to color register printing on the common impression cylinder. Because the gear is directly driven, no matter paper or film, overprinting can be very accurate even if a special control device is not additionally arranged, and the printing process is stable, so that the gear is usually used for printing colorful products.
The color density of products produced by the satellite flexographic printing machine at different speeds can be different, the lower the speed is, the deeper the color is, the higher the speed is, the lighter the color is, the larger the speed difference is, the larger the color difference is, which is caused by a closed scraper structure, when the speed is high, the ink in the closed scraper cavity cannot be diffused to the periphery, and the ink, the solvent and the air pumped by an ink pump along with the ink all enter the scraper cavity with limited space and are filled into the meshes of the anilox roller. When air is mixed in the net holes, the ink storage amount is reduced, and the color of the printed product is lighter, wherein the more the air is, the lighter the color is. The color difference value of the color can be obviously measured by using a color difference tester for measurement.
The color of the printed matter needs to be kept consistent, and the color difference value of the color of the printed matter is ensured to be in a specified range, so that the printing speed is kept constant during printing, and the consistency of the printed color is ensured.
Disclosure of Invention
The invention aims to provide an overprinting method of a satellite type flexographic printing machine, which aims to solve the problem that the prior satellite type flexographic printing machine can keep the printing speed constant during printing.
In order to achieve the purpose, the invention provides the following technical scheme: the overprinting method of the satellite type flexographic printing machine is characterized by comprising the following steps: the overprinting method of the satellite type flexographic printing machine comprises the following steps:
the method comprises the following steps: setting the standard color of a printed matter as A, and printing the standard color A when the printing speed of the satellite type flexographic printing machine is V;
step two: preprinting, namely adjusting the printing speed of the satellite type flexible printing machine to V through a control module i Keeping the printing speed constant and keeping the printing speed constant (| X | < 0.2V), comparing the color of the printed matter with the standard color A by using a color difference tester, and measuring the color difference value T ia Eliminating the maximum color difference value T imax And a minimum color difference value T imin Then using the remaining color difference value T ia Calculating the average color difference T Are all i While using maximum colorDifference T imax Minus the minimum colour difference value T imin The fluctuation range Delta T of the color difference value can be obtained i ＝T imax -T imin ；
Step three: constructing a formula and judging delta T i Of which the maximum value DeltaT is selected max Setting Δ T max The corresponding printing speed is a standard speed V Sign board ，ΔT max The corresponding average color difference is the standard color difference T Uniform label Judgment of V i And V Sign board By a size greater than V Sign V of i And V i Corresponding average color difference T Are all i Constructing a chromatic aberration-high speed linear equation assuming that it is greater than V Sign V of i Having P groups, let P group V i Has an average value of V All over the great P group T Are all i Has an average value of T All over the world The formula of the chromatic aberration-high-speed linear equation is
Step four: formal printing, determination of Δ T i Of which the minimum value DeltaT is selected min And by Δ T min Printing the printed matter at the corresponding printing speed, and setting the color difference value T allowing the printed matter to deviate Deflection When printing, the color difference tester compares the colors of the printed matter, and when the detected color difference value T is detected Detection of Out of color difference value T Deflection Then, when the printing speed of the satellite type flexible plate printing machine is greater than the standard speed V Sign board Printing speed of satellite type flexible plate printing machineThe degree changes along with a chromatic aberration-high-speed linear equation, and when the printing speed of the satellite type flexible printing press is less than a standard speed V Sign board During printing, the printing speed of the satellite type flexographic printing machine changes along with a chromatic aberration-low speed linear equation.
Preferably, the second step is calculating the average color difference T Are all i And fluctuation range of color difference value Delta T i First, the printing speed V is adjusted i Corresponding color difference value T ia Screening to find T in the imin Printing speed V corresponding to > 0 min And T imax Printing speed V corresponding to < 0 max Retention of V min To V max V between i Then calculates the residual V i Average color difference T of corresponding data Are all i And fluctuation range of color difference value Delta T i 。
Preferably, the acceleration of the satellite type flexible printing machine is 1-2 m/s when the satellite type flexible printing machine is accelerated 2 When the satellite type flexible printing machine is decelerated, the acceleration is more than or equal to-1.5 m/s 2 。
Preferably, the printing speed V of the satellite type flexible printing press i Not more than 10m/s, and the acceleration of the satellite type flexible printing press is 1m/s when the satellite type flexible printing press is accelerated 2 Printing speed V of said satellite flexographic printing machine i Not less than 20m/s, and the acceleration of the satellite type flexible printing machine is 2m/s when the satellite type flexible printing machine is accelerated 2 The printing speed of the satellite type flexible plate printing machine is 10m/s < V i When the speed is less than 20m/s, the acceleration value of the satellite type flexible printing machine is 0.1 time of the printing speed value when the satellite type flexible printing machine is accelerated.
Preferably, the printing speed V of the satellite type flexible printing press i When the speed is more than or equal to 30m/s, the acceleration of the satellite type flexible printing machine is-1.5 m/s when the satellite type flexible printing machine decelerates 2 Printing speed V of said satellite flexographic printing machine i When the speed is less than or equal to 30m/s, the absolute value of the acceleration value is 0.05 times of the printing speed.
Preferably, the color difference value T in the fourth step Deflection Including an upper deviation T Upward bias And lower deviation T Downward deviation When T is Detection of ≥0.8T Upward bias When, or T Detection of ≤0.8T Downward deviation When is about to T Examination of The printing speed is changed by being introduced into a color difference-high speed linear equation or a color difference-low speed linear equation.
Preferably, when the printed matter is printed, a cursor is printed on the printed matter, the cursor is arranged to be in a right triangle shape, then the time for the cursor to pass is measured by using an optical measuring instrument, the length of a useful right-angle side of the cursor is b, and the standard time for the cursor to pass is b/V i When the time of passing the cursor is greater than the standard time, the time is b/V i If the cursor passes through the cursor, the cursor is inclined clockwise, and the time when the cursor passes through is less than the standard time and is b/V i And then, the printed matter is inclined counterclockwise.
Compared with the prior art, the invention has the beneficial effects that:
before formal printing, the chromatic aberration-high speed linear equation and the chromatic aberration-low speed linear equation are determined through preprinting, during formal printing, the chromatic aberration of a printed matter is compared through a chromatic aberration tester, then the printing speed is adjusted through the change of the chromatic aberration, the color of the printed matter can be changed through adjusting the printing speed, the color is changed through speed adjustment and is complemented with automatic color change of a satellite type flexographic printing machine, and further the color difference value of the printed matter is always within the color difference value deviation range allowed by the printed matter.
Drawings
FIG. 1 is a schematic view of the working process of the present invention;
FIG. 2 is a schematic view of the light indication of the printed matter of the present invention when the printed matter is not tilted;
FIG. 3 is a schematic view of the light indication of the clockwise tilt of the printed matter of the present invention;
fig. 4 is a light indicating view of a printed matter according to the present invention when it is tilted counterclockwise.
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.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided", "fitted/connected", "connected", and the like, are to be interpreted broadly, such as "connected", which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
referring to fig. 1-4, the present invention provides a technical solution: the overprinting method of the satellite type flexographic printing machine comprises the following steps:
the method comprises the following steps: setting the standard color of a printed matter as A, and printing the standard color A when the printing speed of the satellite type flexographic printing machine is V;
step two: the control module can adjust the printing speed of the satellite type flexible printing machine to be V i Keeping the printing speed constant and keeping the printing speed constant (| X | < 0.2V), comparing the color of the printed matter with the standard color A by using a color difference tester, and measuring the color difference value T ia Eliminating the maximum color difference value T imax And a minimum color difference value T imin Then useThe remaining color difference value T ia Calculating the average color difference T Are all i While using the maximum colour difference value T imax Minus the minimum colour difference value T imin The fluctuation range Delta T of the color difference value can be obtained i ＝T imax -T imin By varying the size of X to vary V i Can obtain a plurality of groups of color difference value fluctuation ranges delta T i And the average color difference T Are all i Wherein the number of data sets with X > 0 in the multiple groups of data is the same as the number of data sets with X < 0;
step three: constructing a formula and judging delta T i Of which the maximum value DeltaT is selected max Setting Δ T max The corresponding printing speed is a standard speed V Sign board ，ΔT max The corresponding average color difference is the standard color difference T Uniform label Judgment of V i And V Sign By a size greater than V Sign board V of i And V i Corresponding average color difference T Are all i Constructing a chromatic aberration-high speed linear equation assuming that it is greater than V Sign board V of i Having P groups, let P group V i Has an average value of V All over the world P group T Are all i Has an average value of T All over the world The formula of the chromatic aberration-high-speed linear equation is
Step four: formal printing, determination of Δ T i Of which the minimum value DeltaT is selected min And by Δ T min Printing the printed matter at the corresponding printing speed whileSetting a color difference value T that allows deviation of a printed matter Deflection When printing, the color difference tester compares the colors of the printed matter, and when the detected color difference value T is detected Examination of Out of color difference value T Deflection Then, when the printing speed of the satellite type flexible printing press is greater than the standard speed V Sign board The printing speed of the satellite type flexible printing machine is changed along with a chromatic aberration-high speed linear equation, and the printing speed of the satellite type flexible printing machine is changed
When the printing speed of the satellite type flexible plate printing machine is less than the standard speed V Sign board The printing speed of the satellite type flexible printing machine is changed along with a chromatic aberration-low speed linear equation, and the printing speed of the satellite type flexible printing machine is changed
The color difference value is T ia When the color difference value is T, the color of the printed matter is darker than that of the standard color A ia When the color difference is less than 0, the color of the printed matter is lighter than that of the standard color A, and the average color difference T is calculated in the second step Are all i And fluctuation range of color difference value Delta T i First, the printing speed V is adjusted i Corresponding color difference value T ia Screening to find T in the extract imin Printing speed V corresponding to > 0 min And T imax Printing speed V of < 0 max Retention of V min To V max V between i When T is imin > 0 or T imax When < 0, it means that the color of the printed matter at this time cannot cover the standard color A, and when the printing speed is V =25m/s, V min ＝21m/s，V max When =27m/s, then the retained V i Between 21 and 27m/s, and then calculating V between 21 and 27m/s i Average color difference T of corresponding data Are all i And fluctuation range of color difference value Delta T i 。
When the satellite type flexible plate printing machine is accelerated, the acceleration is 1-2 m/s 2 Satellite type flexible printingWhen the machine is decelerated, the acceleration of the machine is more than or equal to-1.5 m/s 2 。
Printing speed V of satellite type flexible plate printing machine i Not more than 10m/s, and the acceleration of the satellite type flexible printing machine is 1m/s when the satellite type flexible printing machine is accelerated 2 Printing speed V of satellite flexographic printing press i Not less than 20m/s, the acceleration of the satellite type flexible printing machine is 2m/s when the satellite type flexible printing machine is accelerated 2 The printing speed of the satellite type flexible plate printing machine is 10m/s < V i When the speed is less than 20m/s, the acceleration value of the satellite type flexible printing machine is 0.1 time of the printing speed value when the satellite type flexible printing machine is accelerated.
Printing speed V of satellite type flexible plate printing machine i When the speed is more than or equal to 30m/s, the acceleration of the satellite type flexible printing machine is-1.5 m/s when the satellite type flexible printing machine decelerates 2 Printing speed V of satellite flexographic printing press i When the speed is less than or equal to 30m/s, the absolute value of the acceleration value is 0.05 times of the printing speed.
Color difference value T in step four Deflection Including an upper deviation T Upward bias And lower deviation T Downward deviation When T is Detection of ≥0.8T Upward bias When, or T Detection of ≤0.8T Downward deviation At that time, i.e. T Detection of The printing speed is changed by substituting the linear equation of color difference-high speed or the linear equation of color difference-low speed.
Delta T in step three max When the number of the V is two or more, the size of | X | is judged, and V corresponding to the minimum value of | X | is selected i Is a V Sign When two minimum values of | X | exist, selecting V corresponding to X > 0 i Is a V Sign board 。
When the printed matter is printed, a cursor is printed on the printed matter, the cursor is arranged to be in a right triangle shape, then the time for the cursor to pass is measured by using an optical measuring instrument, the length of a useful right-angle side of the cursor is b, and the standard time for the cursor to pass is b/V i When the time of passing the cursor is greater than the standard time, b/V is used i If the cursor passes through the cursor, the cursor is inclined clockwise, and the time when the cursor passes through is less than the standard time and is b/V i The term "means that the printed matter is inclined counterclockwise, and the printed matter is inclined when printed, and the conventional methods are all performed byThe device calculates the passing length of the cursor by measuring the passing time of the cursor, when the printed matter is not inclined, the passing length of the cursor is b, the vertex angle corresponding to the right-angled side b of the cursor is assumed to be alpha, when the cursor is inclined clockwise by beta, the passing length of the cursor is b sin (beta 1+ beta 0)/sin beta 2, (beta 4+ beta 3) < 90 degrees, because (beta 5+ beta 6) and beta 7 are both less than 90 degrees and beta and alpha are both greater than 0, the passing length of the cursor is longer when the cursor is inclined clockwise, and the passing length of the cursor is b cos gamma when the cursor is rotated by gamma. Gamma is more than 0 and less than 90, as cos gamma is more than 0 and less than 1, namely when the cursor is inclined anticlockwise, the passing length of the cursor is shortened, and the inclination angle of the cursor can be known through the length change of the passing length of the cursor, thereby being convenient for workers to adjust the satellite type flexographic printing machine.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
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 (8)
1. The overprinting method of the satellite type flexographic printing machine is characterized by comprising the following steps: the overprinting method of the satellite type flexographic printing machine comprises the following steps:
the method comprises the following steps: setting the standard color of a printed matter as A, and printing the standard color A when the printing speed of the satellite type flexographic printing machine is V;
step two: preprinting, namely adjusting the printing speed of the satellite type flexible printing machine to V through a control module i Keeping the printing speed constant and keeping the printing speed constant (| X | < 0.2V), comparing the color of the printed matter with the standard color A by using a color difference tester, and measuring the color difference value T ia Removing the maximum color difference value T imax And a minimum color difference value T imin Then using the remaining color difference value T ia Calculating the average color difference T Are all i While using the maximum colour difference value T imax Minus the minimum colour difference value T imin The fluctuation range Delta T of the color difference value can be obtained i ＝T imax -T imin ；
Step three: constructing a formula and judging delta T i Of which the maximum value DeltaT is selected max Setting Δ T max The corresponding printing speed is a standard speed V Sign board ，ΔT max The corresponding average color difference is the standard color difference T Uniform label Judgment of V i And V Sign By a size greater than V Sign V of i And V i Corresponding average color difference T Are all i Constructing a chromatic aberration-high speed linear equation assuming that it is greater than V Sign board V of i Having P groups, let P group V i Has an average value of V All over the world P group T Are all i Has an average value of T All over the great The formula of the chromatic aberration-high-speed linear equation is
Using less than V Sign board V of i And its corresponding average color difference T Are all i Constructing a linear equation of chromatic aberration-low speed, assuming that the linear equation is less than V Sign board V of i Having Q groups, let Q group V i Has an average value of V All are small Q group T All are i Has an average value of T All are small The equation of the linear equation of color difference-low speed is
Step four: formal printing, determination of Δ T i Of which the minimum value DeltaT is selected min And by Δ T min Printing the printed matter at the corresponding printing speed, and setting the color difference value T allowing the printed matter to deviate Deflection When printing, the color difference tester compares the colors of the printed matter, and when the detected color difference value T is detected Detection of Out of color difference value T Deflection Then, when the printing speed of the satellite type flexible plate printing machine is greater than the standard speed V Sign When the printing speed of the satellite type flexible printing machine is changed along with the color difference-high speed linear equation, when the printing speed of the satellite type flexible printing machine is less than the standard speed V Sign During printing, the printing speed of the satellite type flexographic printing machine changes along with a chromatic aberration-low speed linear equation.
2. The overprinting method of the satellite type flexographic printing machine according to claim 1, characterized in that: said step two is calculating the average color difference T Are all i And fluctuation range of color difference value Delta T i First, the printing speed V is adjusted i Corresponding color difference value T ia Screening to find T in the extract imin Printing speed V corresponding to > 0 min And T imax Printing speed V corresponding to < 0 max Retention of V min To V max V between i Then calculates the residual V i Average color difference T of corresponding data Are all i And fluctuation range of color difference value Delta T i 。
3. The overprinting method of the satellite type flexographic printing machine according to claim 1, characterized in that: when the satellite type flexible printing machine is accelerated, the acceleration is 1-2 m/s 2 When the satellite type flexible printing machine is decelerated, the acceleration is more than or equal to-1.5 m/s 2 。
4. The overprinting method of the satellite type flexographic printing machine according to claim 3, characterized in that: printing speed V of satellite type flexographic printing machine i Not more than 10m/s, and the acceleration of the satellite type flexible printing press is 1m/s when the satellite type flexible printing press is accelerated 2 Printing speed V of said satellite flexographic printing machine i Not less than 20m/s, and the acceleration of the satellite type flexible printing machine is 2m/s when the satellite type flexible printing machine is accelerated 2 The printing speed of the satellite type flexible plate printing machine is 10m/s < V i When the speed is less than 20m/s, the acceleration value of the satellite type flexible printing machine is 0.1 time of the printing speed value when the satellite type flexible printing machine is accelerated.
5. The overprinting method of the satellite type flexographic printing machine according to claim 3, characterized in that: printing speed V of satellite type flexographic printing machine i When the speed is more than or equal to 30m/s, the acceleration of the satellite type flexible printing machine is-1.5 m/s when the satellite type flexible printing machine decelerates 2 Printing speed V of said satellite flexographic printing machine i When the speed is less than or equal to 30m/s, the absolute value of the acceleration value is 0.05 times of the printing speed.
6. The overprinting method of the satellite type flexographic printing machine according to claim 1, characterized in that: color difference value T in the fourth step Deflection Including an upper deviation T Upward bias And lower deviation T Lower deviation When T is Detection of ≥0.8T Upward bias When, or T Examination of ≤0.8T Downward deviation When is about to T Detection of The printing speed is changed by being introduced into a color difference-high speed linear equation or a color difference-low speed linear equation.
7. The overprinting method of the satellite type flexographic printing machine according to claim 1, characterized in that: when Δ T in step three max When the number of the V is two or more, the size of | X | is judged, and V corresponding to the minimum value of | X | is selected i Is a V Sign board When the minimum value of | X | is two, selecting V corresponding to X > 0 i Is a V Sign board 。
8. The overprinting method of the satellite type flexographic printing machine according to claim 1, characterized in that: when the printed matter is printed, a cursor is printed on the printed matter, the cursor is arranged to be in a right triangle shape, then the time for the cursor to pass is measured by using an optical measuring instrument, the length of a useful right-angle side of the cursor is b, and the standard time for the cursor to pass is b/V i When the time of passing the cursor is greater than the standard time, the time is b/V i If the cursor passes through the cursor, the cursor is inclined clockwise, and the time when the cursor passes through is less than the standard time and is b/V i And then, the printed matter is inclined counterclockwise.
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| JPH0783430B2 (en) * | 1986-07-30 | 1995-09-06 | 日本電気株式会社 | Color masking parameter determination device |
| JPH11164320A (en) * | 1997-11-28 | 1999-06-18 | Fuji Photo Film Co Ltd | Method and system for decoding color compression image |
| JP5561983B2 (en) * | 2009-09-29 | 2014-07-30 | 富士フイルム株式会社 | Profile generation method, program, and apparatus |
| CN101713994B (en) * | 2009-12-03 | 2011-09-21 | 陕西北人印刷机械有限责任公司 | Information management system for on-line production of printing machine and method thereof |
| CN102909950B (en) * | 2011-08-03 | 2015-12-09 | 海德堡印刷机械股份公司 | The control of the inking device when print speed printing speed changes |
| DE102014005289A1 (en) * | 2013-05-08 | 2014-11-13 | Heidelberger Druckmaschinen Ag | Color control concept for printing machines with short inking unit |
| CN103753947A (en) * | 2013-12-25 | 2014-04-30 | 陕西北人印刷机械有限责任公司 | Satellite type flexo printing machine based chromatography method |
| DE102016000335A1 (en) * | 2016-01-18 | 2017-07-20 | Heidelberger Druckmaschinen Ag | Method for compensating job and machine specific registration inaccuracies and register errors |
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