CN113910792A - Overprinting method of satellite type flexible printing press - Google Patents

Overprinting method of satellite type flexible printing press Download PDF

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CN113910792A
CN113910792A CN202111156087.8A CN202111156087A CN113910792A CN 113910792 A CN113910792 A CN 113910792A CN 202111156087 A CN202111156087 A CN 202111156087A CN 113910792 A CN113910792 A CN 113910792A
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speed
color difference
printing
satellite type
printing machine
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CN113910792B (en
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余天祥
刘汉桥
王六云
吴浩
刘绍斌
汪从志
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Anhui Tianxiang High Tech Special Packaging Materials Group Co ltd
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Anhui Tianxiang High Tech Special Packaging Materials Group Co ltd
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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
    • 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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  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
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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

Overprinting method of satellite type flexible printing press
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, even if a special control device is not additionally arranged, overprinting can still be accurately carried out, and the printing process is stable, so that the gear is commonly 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, however, the air quantity entering the scraper cavity is fluctuated during the constant-speed printing process, when the fluctuation peak value of the air quantity is small, the color difference value of the color of the printed matter does not exceed the specified range, and when the fluctuation peak value range of the air quantity, the color difference value of the color of the printed matter exceeds the specified range, so that the printed matter needs to be screened later, and when printing, the printing speed and the fluctuation value of the air quantity entering the scraper cavity can be in a relative balance state, so that the color difference value of the color of the printed matter can be prevented from exceeding the specified range.
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 moduleiV + X (| X | < 0.2V), keeping the printing speed constant, comparing the color of the printed matter with the standard color A by using a color difference tester, and measuring the color difference value TiaEliminating the maximum color difference value TimaxAnd a minimum color difference value TiminThen using the remaining color difference value TiaCalculating the average color difference TAre all iWhile using the maximum colour difference value TimaxMinus the minimum colour difference value TiminThe fluctuation range Delta T of the color difference value can be obtainedi＝Timax-Timin；
Step three: constructing a formula and judging delta TiOf which the maximum value DeltaT is selectedmaxSetting Δ TmaxThe corresponding printing speed is a standard speed VSign board，ΔTmaxCorresponding average color difference TUniform labelJudgment of ViAnd VSign boardBy a size greater than VSign boardV ofiAnd its corresponding average color difference TAre all iConstructing a chromatic aberration-high speed linear equation assuming that it is greater than VSign boardV ofiHaving P groups, let P group ViHas an average value of VAll over the worldP group TAre all iHas an average value of TAll over the worldThe formula of the chromatic aberration-high-speed linear equation is
Figure BDA0003288669090000021
Figure BDA0003288669090000022
Using less than VSign boardV ofiAnd its corresponding average color difference TAre all iConstructing a linear equation of chromatic aberration-low speed, assuming that the linear equation is less than VSign boardV ofiHaving Q groups, let Q group ViHas an average value of VAll are smallQ group TAre all iHas an average value of TAll are smallThe equation of the linear equation of color difference-low speed is
Figure BDA0003288669090000023
Step four: formal printing, determination of Δ TiOf which the minimum value DeltaT is selectedminAnd by Δ TminPrinting the printed matter at the corresponding printing speed, and setting the color difference value T allowing the printed matter to deviateDeflectionWhen printing, the color difference tester compares the colors of the printed matter, and when the detected color difference value T is detectedDetection ofOut of color difference value TDeflectionThen, when the printing speed of the satellite type flexible plate printing machine is greater than the standard speed VSign boardWhen the printing speed of the satellite type flexible printing machine is less than the standard speed V, the printing speed of the satellite type flexible printing machine changes along with a chromatic aberration-high speed linear equationSign boardDuring 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 to calculate the average color difference TAre all iAnd fluctuation range of color difference value Delta TiFirst, the printing speed V is adjustediCorresponding color difference value TiaScreening to find T in the extractiminPrinting speed V corresponding to > 0minAnd TimaxPrinting speed V corresponding to < 0maxRetention of VminTo VmaxV betweeniThen calculates the residual ViAverage color difference T of corresponding dataAre all iAnd fluctuation range of color difference value Delta Ti。
Preferably, when the satellite type flexible printing machine is accelerated, the acceleration of the satellite type flexible printing machine is 1-2 m/s2When the satellite type flexible printing machine is decelerated, the acceleration is more than or equal to-1.5 m/s2。
Preferably, the printing speed of the satellite type flexible plate printing machine is less than ViNot 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 accelerated2Printing speed V of said satellite flexographic printing machineiNot 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 accelerated2The printing speed of the satellite type flexible plate printing machine is 10m/s < ViWhen 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 of the satellite type flexible plate printing machine is less than ViWhen 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 decelerates2The printing speed of the satellite type flexible plate printing machine is less than ViWhen 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 stepDeflectionIncluding an upper deviation TUpward biasAnd lower deviation TDownward deviationWhen T isDetection of≥0.8TUpward biasWhen, or TDetection of≤0.8TDownward deviationWhen is about to TDetection ofThe 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 the 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/ViWhen the time of passing the cursor is greater than the standard time, the time is b/ViIf 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/ViAnd 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.
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FIG. 1 is a schematic flow chart 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, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not 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," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "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 ViV + X (| X | < 0.2V), keeping the printing speed constant, comparing the color of the printed matter with the standard color A by using a color difference tester, and measuring the color difference value TiaEliminating the maximum color difference value TimaxAnd a minimum color difference value TiminThen using the remaining color difference value TiaCalculating the average color difference TAre all iWhile using the maximum colour difference value TimaxMinus the minimum colour difference value TiminThe fluctuation range Delta T of the color difference value can be obtainedi＝Timax-TiminBy varying the size of X to vary ViCan obtain a plurality of groups of color difference value fluctuation ranges delta TiAnd the average color difference TAre all iWherein 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 TiOf which the maximum value DeltaT is selectedmaxSetting Δ TmaxThe corresponding printing speed is a standard speed VSign board，ΔTmaxCorresponding average color difference TUniform labelJudgment of ViAnd VSign boardBy a size greater than VSign boardV ofiAnd its corresponding average color difference TAre all iConstructing a chromatic aberration-high speed linear equation assuming that it is greater than VSign boardV ofiHaving P groups, let P group ViHas an average value ofVAll over the worldP group TAre all iHas an average value of TAll over the worldThe formula of the chromatic aberration-high-speed linear equation is
Figure BDA0003288669090000051
+VSign board. Using less than VSign boardV ofiAnd its corresponding average color difference TAre all iConstructing a linear equation of chromatic aberration-low speed, assuming that the linear equation is less than VSign boardV ofiHaving Q groups, let Q group ViHas an average value of VAll are smallQ group TAre all iHas an average value of TAll are smallThe equation of the linear equation of color difference-low speed is
Figure BDA0003288669090000052
Step four: formal printing, determination of Δ TiOf which the minimum value DeltaT is selectedminAnd by Δ TminPrinting the printed matter at the corresponding printing speed, and setting the color difference value T allowing the printed matter to deviateDeflectionWhen printing, the color difference tester compares the colors of the printed matter, and when the detected color difference value T is detectedDetection ofOut of color difference value TDeflectionThen, when the printing speed of the satellite type flexible plate printing machine is greater than the standard speed VSign boardThe 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
Figure BDA0003288669090000061
When the printing speed of the satellite type flexible plate printing machine is less than the standard speed VSign boardThe 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
Figure BDA0003288669090000062
Figure BDA0003288669090000063
The color difference value is TiaWhen the pressure is higher than 0, the pressure is higher,indicating that the color of the print is darker than that of the standard color A when the color difference is TiaWhen 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 stepAre all iAnd fluctuation range of color difference value Delta TiFirst, the printing speed V is adjustediCorresponding color difference value TiaScreening to find T in the extractiminPrinting speed V corresponding to > 0minAnd TimaxPrinting speed V corresponding to < 0maxRetention of VminTo VmaxV betweeniWhen T isimin> 0 or TimaxWhen the color of the printed matter can not cover the standard color A at the moment, the printing speed is V25 m/s, Vmin＝21m/s，VmaxWhen the ratio is 27m/s, the retained ViBetween 21 and 27m/s, and then calculating V between 21 and 27m/siAverage color difference T of corresponding dataAre all iAnd fluctuation range of color difference value Delta Ti。
When the satellite type flexible printing machine is accelerated, the acceleration is 1-2 m/s2When the satellite type flexible printing machine is decelerated, the acceleration is more than or equal to-1.5 m/s2。
Printing speed of satellite type flexible plate printing machine is less than ViNot 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 accelerated2Printing speed V of satellite flexographic printing pressiNot less than 20m/s, the acceleration of the satellite type flexible printing machine is 2m/s when the satellite type flexible printing machine is accelerated2The printing speed of the satellite type flexible plate printing machine is 10m/s < ViWhen 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 of satellite type flexible plate printing machine is less than ViWhen 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 decelerates2The printing speed of the satellite type flexographic printing machine is less than ViWhen 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 fourDeflectionIncluding an upper deviation TUpward biasAnd lower deviation TDownward deviationWhen T isDetection of≥0.8TUpward biasWhen, or TDetection of≤0.8TDownward deviationWhen is about to TDetection ofThe printing speed is changed by being introduced into a color difference-high speed linear equation or a color difference-low speed linear equation.
Delta T in step threemaxWhen 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 selectediIs a VSign boardWhen the minimum value of | X | is two, selecting V corresponding to X > 0iIs a VSign 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/ViWhen the time of passing the cursor is greater than the standard time, the time is b/ViIf 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/ViThe prior method is to manually observe and then adjust the printed matter, the manual observation can be observed only when the inclination of the printed matter is larger, the 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-angle side b of the cursor is assumed to be alpha, when the cursor is inclined clockwise, 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, at the moment, (alpha + beta) > alpha, sin (alpha + beta) is greater than sin alpha, namely when the cursor is inclined clockwise, the passing length of the cursor is longer, and when the counterclockwise rotation angle of the cursor is gamma, the passing length of the cursor at this time is b × cos 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 moduleiV + X (| X | < 0.2V), keeping the printing speed constant, comparing the color of the printed matter with the standard color A by using a color difference tester, and measuring the color difference value TiaEliminating the maximum color difference value TimaxAnd a minimum color difference value TiminThen using the remaining color difference value TiaCalculating the average color difference TAre all iWhile using the maximum colour difference value TimaxMinus the minimum colour difference value TiminThe fluctuation range Delta T of the color difference value can be obtainedi＝Timax-Timin；
Step three: constructing a formula and judging delta TiOf which the maximum value is selectedΔTmaxSetting Δ TmaxThe corresponding printing speed is a standard speed VSign board，ΔTmaxCorresponding average color difference TUniform labelJudgment of ViAnd VSign boardBy a size greater than VSign boardV ofiAnd its corresponding average color difference TAre all iConstructing a chromatic aberration-high speed linear equation assuming that it is greater than VSign boardV ofiHaving P groups, let P group ViHas an average value of VAll over the worldP group TAre all iHas an average value of TAll over the worldThe formula of the chromatic aberration-high-speed linear equation is
Figure FDA0003288669080000011
VSign board. Using less than VSign boardV ofiAnd its corresponding average color difference TAre all iConstructing a linear equation of chromatic aberration-low speed, assuming that the linear equation is less than VSign boardV ofiHaving Q groups, let Q group ViHas an average value of VAll are smallQ group TAre all iHas an average value of TAll are smallThe equation of the linear equation of color difference-low speed is
Figure FDA0003288669080000012
Step four: formal printing, determination of Δ TiOf which the minimum value DeltaT is selectedminAnd by Δ TminPrinting the printed matter at the corresponding printing speed, and setting the color difference value T allowing the printed matter to deviateDeflectionWhen printing, the color difference tester compares the colors of the printed matter, and when the detected color difference value T is detectedDetection ofOut of color difference value TDeflectionThen, when the printing speed of the satellite type flexible plate printing machine is greater than the standard speed VSign boardWhen the printing speed of the satellite type flexible printing machine is less than the standard speed V, the printing speed of the satellite type flexible printing machine changes along with a chromatic aberration-high speed linear equationSign boardDuring printing, the printing speed of the satellite type flexographic printing machine changes along with a chromatic aberration-low speed linear equation.
2. The satellite of claim 1The overprinting method of the flexographic printing machine is characterized by comprising the following steps: the second step is to calculate the average color difference TAre all iAnd fluctuation range of color difference value Delta TiFirst, the printing speed V is adjustediCorresponding color difference value TiaScreening to find T in the extractiminPrinting speed V corresponding to > 0minAnd TimaxPrinting speed V corresponding to < 0maxRetention of VminTo VmaxV betweeniThen calculates the residual ViAverage color difference T of corresponding dataAre all iAnd fluctuation range of color difference value Delta Ti。
3. The overprinting method of the satellite type flexographic printing machine according to claim 1, characterized in that: when the satellite type flexible printing press is accelerated, the acceleration is 1-2 m/s2When the satellite type flexible printing machine is decelerated, the acceleration is more than or equal to-1.5 m/s2。
4. The overprinting method of the satellite type flexographic printing machine according to claim 3, characterized in that: the printing speed of the satellite type flexible printing press is less than ViNot 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 accelerated2Printing speed V of said satellite flexographic printing machineiNot 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 accelerated2The printing speed of the satellite type flexible plate printing machine is 10m/s < ViWhen 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: the printing speed of the satellite type flexible printing press is less than ViWhen 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 decelerates2The printing speed of the satellite type flexible plate printing machine is less than ViWhen 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: the color difference value T in the fourth stepDeflectionIncluding an upper deviation TUpward biasAnd lower deviation TDownward deviationWhen T isDetection of≥0.8TUpward biasWhen, or TDetection of≤0.8TDownward deviationWhen is about to TDetection ofThe 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 threemaxWhen 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 selectediIs a VSign boardWhen the minimum value of | X | is two, selecting V corresponding to X > 0iIs a VSign 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/ViWhen the time of passing the cursor is greater than the standard time, the time is b/ViIf 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/ViAnd then, the printed matter is inclined counterclockwise.
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