CN207059436U - A kind of preset ink brush device of computer based on four-color process - Google Patents
A kind of preset ink brush device of computer based on four-color process Download PDFInfo
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- CN207059436U CN207059436U CN201720786225.3U CN201720786225U CN207059436U CN 207059436 U CN207059436 U CN 207059436U CN 201720786225 U CN201720786225 U CN 201720786225U CN 207059436 U CN207059436 U CN 207059436U
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Abstract
The utility model belongs to printing equipment technical field, and in particular to a kind of preset ink brush device of computer of printing effect preferably based on four-color process.Including paper feed portion, chart driving mechanism, four-color process portion and paper delivery portion, the cylindrical cavity both sides of roller core are separately installed with preset print cartridge, and preset print cartridge is rectangular parallelepiped structure, and the inwall side of preset print cartridge is provided with liquid level sensor；In preset print cartridge, cylinder is installed with the reverse position of the cylindrical cavity link position of roller core；Cylinder and liquid level sensor are connected by wireless signal with computer.When by four-color process portion, computer is according to the cylindrical empty intracavitary that the ink in preset print cartridge is pushed into roller core with ink amount control cylinder for being pre-designed printed pattern, black amount is pushed away by what liquid level sensor obtained preset print cartridge, final accurate control ink transfer rubber roll uses ink amount, makes printing quality control more accurate.
Description
Technical field
The utility model belongs to printing equipment technical field, and in particular to a kind of printing effect is preferably based on four-color process
The preset ink brush device of computer.
Background technology
Four-color process refers to be realized by mixing principle of losing lustre with Red Green Blue and black pigment (ink or dyestuff)
The lithographic process that full color replicates.Many printing enterprises strengthen high-grade color to improve company's colored printing product quality
Color printed matter occupation rate of market, the printing of product is all carried out using the good four-color press of effect.Described four-color press is special
Refer to the printing machine that black, middle blueness, brown and green four kinds of ink realize the lithographic process that map replicates.
Before " spectrum color seperation " forms four color Process Color printings, colored printing to open color by hand, is wrapped mostly
Include Ming Dynasty Chinese " wood-block printing " to cut blocks for printing and print to the color separation of up to a hundred editions with tens of versions, form picture quite true to nature, and originally
Paintings are several to look genuine.Ukjyoe, the brocade of Japan are painted, and are continued to use a kind of this painting style and printing mode, are added for Japanese common people's Life Art
Add many temperament and interest, as the landscape wood-block printing of Tokaido 50 three times, show many local conditions and customs, it is just deep to influence finally Europe
The continent impressionist painting style.When lithographic techniques pass to Japan, there is height artistic accomplishment artist to use " color is opened on stone plate " instead for some, with point
Retouch or open color right-falling stroke net skill and technique and show deep or light and texture, as long as the printing of more than ten, 20 colors just can form very exquisite lithographic printing effect, this
Kind purely with open color person experience person and judgement, using the set color ink printing of Western stone plate, vertical next extremely exquisite works are painted for brocade.
19th-century invention photography, " white photograph coloring skill " is more developed, so twenty beginning of the century used relief printing plate four
Color prints, and adds and subtracts color with carbon dust cartographic technique on glass plate continuously adjusting, such as greenery plus YC versions, subtracts M versions green color can be presented
Coloured silk, brick wall, which adds YM, subtracts C versions can be presented bronzing, such, and color is removed out with the general knowledge skill of colour-separation drafting person, rotten after netting western version
Erosion, forms four color relief printing plate original block colour postcards of intimate hand dyeing, this kind of technology is in day early stage according to TaiWan, China, Man Zhou
State and in Japan performance landscape, building image.
Other one kind be then based on photograph or watercolor, also with stone plate open color method with it is red, yellow, blue, green, grey,
It is black to wait color, it is full of version, site, point is retouched or lines, turns into chromatography completion, the picture that there is photograph or drawing to feel, is in Japan
Adoption brocade is painted and the skill and technique of Ukjyoe, and TaiWan, China artist Mr. Lan Yinding also once did this kind of color of opening for book cover and worked,
Autumn rain prints Lin Qiuyu president, and also oneself creation trade mark, exploitation open color printed works in one's early years.
These skill and technique still have use to generation nineteen fifty to the sixties, the TaiWan, China photograph four-color separation after the sixties
After method prevalence, color chromatography technology being opened by hand and is just progressively declined, everybody changes using egative film color separation, crosses net, four color deep-etch printings
As a formal technology, net color separation, electron scanning color separation were directly crossed later, organizes page system, to colour EPS today, was printed
Brush is using four color mesh sheet CMYK four-colour chromatographies into unbreakable pattern.
Due to being limited by colorant and production technology, C, M, Y, K primary color inks that four-color process uses print colour developing
The curve of spectrum has larger gap with the desired color curve of spectrum.Secondary colours CM, CY, MY color developing effect of ink trapping, particularly
Blueness and green are bigger with desired color gap.With existing Printing ink producing technique, ink performance is significantly increased, leaves
Space it is little.Therefore, four-color process colour gamut is more difficult very big extension.Four-color process is with print color density matching for a long time
Original copy density.Print color density is measured, is substantially the dosage for measuring printing-ink.As it was previously stated, print color by colour into
Divide and neutral ash component forms, under conditions of printing-ink reference amount is limited, if neutral ash component is excessive, not only cause to print
The larger distortion of map brushing image brightness characteristic, also relative color composition dosage can be reduced, cause color saturation to decline.Four-color process
The vision lightness near linear of color, show that the neutral ash component of print color is excessive.Four-color process emphasizes that lifting replicates face
The saturation degree of color, it is another major defect of four-color process technology using excessive sacrifice colour brightness as cost.With respect to nature scape
For thing color, due to disadvantages described above, four-color process copy colors are heavy, and contrast distortion is larger, and stereovision is untrue, third dimension
It is not strong.Therefore usually complain that printing quality is not high by client.
Wherein because in ink transfer rubber roll cavity ink controlled quentity controlled variable not enough accurately cause deep or light differ of ink-jet effect to ultimately result in print
The problem of brushing effects are not good enough is particularly acute.
Utility model content
The purpose of this utility model is to provide a kind of printing effect preferably more suitable for ink amount control based on four colors
The preset ink brush device of computer of printing.
What the purpose of this utility model was realized in：
A kind of preset ink brush device of computer based on four-color process, including paper feed portion 1, chart driving mechanism 9, four-color process
Portion and paper delivery portion 6, four-color process portion both ends set paper feed portion and paper delivery portion respectively, the paper feed portion and paper delivery portion with
Chart driving mechanism is all connected between four-color process portion, the four-color process portion includes black printing branch 2, cyan print branch 3, product
Rubric branch 4 and yellow printing branch 5, the black printing branch, cyan print branch, magenta printing branch with
And yellow printing branch is arranged in order setting；Ink transfer rubber roll 7, lower ink transfer rubber roll 8 are provided with inside the four-color process portion,
Printing gap is provided between the upper ink transfer rubber roll and lower ink transfer rubber roll, the upper ink transfer rubber roll and lower ink transfer rubber roll wrap respectively
The roller core that outer surface is wrapped with rubber layer is included, roller core is cylindrical cavity, is evenly arranged with the cavity wall and rubber layer of roller core logical
The lattice structure 10 of cellular type；The parallelogram that described lattice structure is formed using four points is uniformly arranged on roller as elementary cell
On the cavity wall of core；The acute angle of parallelogram is in the elementary cell of the lattice structure of the roller core of described black printing branch
45°；The acute angle of parallelogram is 15 ° in the elementary cell of the lattice structure of the roller core of described cyan print branch；It is described
Magenta printing branch roller core lattice structure elementary cell in parallelogram acute angle be 75 °；Described yellow
The acute angle of parallelogram is 90 ° in the elementary cell of the lattice structure of the roller core of printing branch；Described black printing branch
The through-hole diameter of lattice structure be 1.1 times of through-hole diameter of the lattice structure of cyan print branch；Described cyan print
The through-hole diameter of the lattice structure of branch, magenta printing branch and yellow printing branch is equal, the cylinder of described roller core
Shape cavity both sides are separately installed with preset print cartridge 15, and preset print cartridge is rectangular parallelepiped structure, and the inwall side of preset print cartridge is provided with
Liquid level sensor 16；In preset print cartridge, cylinder 17 is installed with the reverse position of the cylindrical cavity link position 18 of roller core；Gas
Cylinder and liquid level sensor are connected by wireless signal with computer.
Described black printing branch, the ink transfer of cyan print branch, magenta printing branch and yellow printing branch
The base of parallelogram is equal in the elementary cell of the lattice structure of rubber roll；Described black printing branch, cyan print point
Parallelogram in the elementary cell of the lattice structure of the ink transfer rubber roll in portion, magenta printing branch and yellow printing branch
It is high equal.
There is a spindle nose at described roller core both ends respectively, and spindle nose 14 is connected axis connection with roller core by an external screw thread, institute
State external screw thread connecting shaft to be integrally formed with the spindle nose, two spindle noses of the roller core are connected to the base by bearing 13 respectively
In the drive mechanism 11 and transmission mechanism 12 of the word double exposure device of four-color process, containment member is provided between spindle nose and bearing.
The rubber layer uses nitrile rubber, thickness 2-3cm.
The containment member uses rubber seal.
Described upper ink transfer rubber roll and the inwall of lower ink transfer rubber roll are provided with heat sink strip.
Described chart driving mechanism is one kind in conveyer belt, transfer roller groups or paper sucking machine.
Described liquid level sensor is area array CCD liquid level sensor.
The beneficial effects of the utility model are：Structure of the present utility model utilizes color of image by Space domain
The relevance estimate of space regional area pixel, differentiate the halftoning spike for influenceing picture quality, printed by described cyan
The lattice structure design of branch, magenta printing branch and yellow printing branch is brushed, and then spike place is chosen using dot matrix
Regional area carry out notch filter processing, make to tend towards stability between image pixel.During work, paper is from paper feed portion by transfer machine
Black printing branch, cyan print branch, magenta printing branch and yellow printing branch are passed through in structure transmission successively, make,
Ink dot matrix splash is formed pattern and word by the roller core of lower ink transfer rubber roll on paper, paper delivery portion is ultimately delivered to, by paper delivery
Collect and handled by subsequent mechanical structure in portion.When by four-color process portion, computer is according to being pre-designed printing figure
The cylindrical empty intracavitary that the ink in preset print cartridge is pushed into roller core with ink amount control cylinder of shape, is obtained by liquid level sensor
Preset print cartridge pushes away black amount, and final accurate control ink transfer rubber roll uses ink amount, makes printing quality control more accurate, prints fidelity
It is higher.
Brief description of the drawings
Fig. 1 is the utility model structure diagram.
Fig. 2 is the lattice structure planar development schematic diagram of the utility model ink transfer rubber roll.
Fig. 3 is ink transfer rubber roll, lower ink transfer rubber roll construction profile on the utility model.
Fig. 4 is preset print cartridges structure figure of the present utility model.
Embodiment
1-4 is described further to the utility model below in conjunction with the accompanying drawings.
With the development of Information technology, increasing printing image made of paper is by scan transformation into electronic image.But
Printing image made of paper especially four-color process is by net-point printing technology print, and this technology is to utilize to control the big of ink dot
The small and density of ink dot shows the gray scale of image or color.
The utility model by net-point printing technology to have researched and proposed a kind of computer based on four-color process preset
Ink brush device, including paper feed portion 1, chart driving mechanism 9, four-color process portion and paper delivery portion 6, four-color process portion both ends difference
Paper feed portion and paper delivery portion are set, are all connected with chart driving mechanism between the paper feed portion and paper delivery portion and four-color process portion, described four
Color Printing Department includes black printing branch 2, cyan print branch 3, magenta printing branch 4 and yellow printing branch 5, described
Black printing branch, cyan print branch, magenta printing branch and yellow printing branch are arranged in order setting；Four color
Ink transfer rubber roll 7, lower ink transfer rubber roll 8 are provided with inside Printing Department, is set between the upper ink transfer rubber roll and lower ink transfer rubber roll
There is printing gap, the upper ink transfer rubber roll and lower ink transfer rubber roll include the roller core that outer surface is wrapped with rubber layer respectively, and roller core is circle
Cylindrical cavity, the lattice structure 10 of through-hole type is evenly arranged with the cavity wall and rubber layer of roller core；Described lattice structure with
The parallelogram that four points are formed is uniformly arranged on the cavity wall of roller core for elementary cell；Described black printing branch
The acute angle of parallelogram is 45 ° in the elementary cell of the lattice structure of roller core；The point of the roller core of described cyan print branch
The acute angle of parallelogram is 15 ° in the elementary cell of battle array structure；The lattice structure of the roller core of described magenta printing branch
Elementary cell in parallelogram acute angle be 75 °；The lattice structure of the roller core of described yellow printing branch it is substantially single
The acute angle of parallelogram is 90 ° in member；The through-hole diameter of the lattice structure of described black printing branch is cyan print point
1.1 times of the through-hole diameter of the lattice structure in portion；Described cyan print branch, magenta printing branch and yellow printing point
The through-hole diameter of the lattice structure in portion is equal, and the cylindrical cavity both sides of described roller core are separately installed with preset print cartridge 15, in advance
It is rectangular parallelepiped structure to put print cartridge, and the inwall side of preset print cartridge is provided with liquid level sensor 16；In preset print cartridge, the circle with roller core
The reverse position of cylindrical cavity link position 18 is provided with cylinder 17；Cylinder and liquid level sensor pass through wireless signal and computer
Connection.Described black printing branch, cyan print branch, magenta printing branch and yellow printing branch roller core point
The base of parallelogram is equal in the elementary cell of battle array structure；Described black printing branch, cyan print branch, magenta
Parallelogram is high equal in the elementary cell of the lattice structure of the roller core of printing branch and yellow printing branch.Work
When, paper is transmitted successively by black printing branch, cyan print branch, magenta printing branch from paper feed portion by chart driving mechanism
And yellow printing branch, make the roller core of upper and lower ink transfer rubber roll that ink dot matrix splash is formed into pattern and word on paper, most
Paper delivery portion is sent to eventually, is collected by paper delivery portion and is handled by subsequent mechanical structure.When by four-color process portion, calculate
Machine is according to the cylindrical cavity that the ink in preset print cartridge is pushed into roller core with ink amount control cylinder for being pre-designed printed pattern
It is interior, push away black amount by what liquid level sensor obtained preset print cartridge, final accurate control ink transfer rubber roll with ink amount, make printing quality
Control is more accurate, and printing fidelity is higher.
Structure of the present utility model utilizes the relevance of color of image space regional area pixel by Space domain
Estimate, differentiate influence picture quality halftoning spike, by described cyan print branch, magenta printing branch and
The lattice structure design of yellow printing branch, and then carried out using the regional area where dot matrix selection spike at notch filter
Reason, makes to tend towards stability between image pixel.For example human eye is most sensitive for black, and generally human eye is for lattice structure
Lattice structure for 45° angle printing is least sensitive, so black is with the dot matrix of 45 ° of degree angle parallelogram in the utility model
Printing, can so weaken black to a certain extent in four-color process to interference effect caused by human eye.Similarly, pass through
Spectrum analysis, the dot matrix angle of other three kinds of colors, and the ratio of ink dot are respectively provided with, word double exposure has been reached optimal
Visual effect, while also improve the quality of four-color process.It need to be noted that be cyan described in the utility model print
Brush the through-hole diameter and Heidelberg, Goebel or small gloomy of the lattice structure of branch, magenta printing branch and yellow printing branch
Dot matrix through-hole diameter Deng ink transfer rubber roll in four-color press is identical.
Ink trapping is illustrated further according to bubble theory, double exposure effect and color are investigated based on ink film thickness
The arrangement of sequence.The density of general blue or green ink is 1.60, and the ink film thickness printed on paper is about 0.85 μm, the density of magenta ink
It is 1.40, the ink film thickness printed on paper is about 0.9 μm, and the density of yellow ink is 1.0, and the ink film thickness printed on paper is 1.30
μm.For ink film thickness, blue or green ink<It is pinkish red<It is yellow.According to bubble theory, according to ink film thickness, gradually increased order prints
Brush, i.e., by blue or green → pinkish red → yellow order, the double exposure situation of ink is best, is typically not in problem.If this
Order is changed, is changed into blue or green → yellow → pinkish red, then, yellow black double exposure is good on blue or green ink, but magenta ink double exposure is in yellow ink
It is upper just bad.It is pinkish red particularly in the state of wet pressing is wet because the ink film thickness that Huang ink is brushed on paper is thicker than magenta ink
The double exposure of ink is just more bad.Measured to make magenta ink double exposure good it is necessary to increase the ink of magenta ink, so, the net of magenta ink
Point will integrally increase, and cause magenta to deepen.If looking after site increase, and reduce pinkish red ink amount, then, magenta ink
Double exposure cannot obtain pure large red to Huang Moshang, and can only obtain orange, and secondary quality is incorrect, can influence certainly
The tone of image.In addition, the viscosity of ink is lower, then the speed of growth of bubble is bigger, therefore in ink colors double exposure in order,
The viscosity of ink should reduce successively.That is during assorted ink trapping, for the viscosity of ink, first the second colors of color ＞ ＞
The colors of 3rd color ＞ the 4th.According to the reasons why above-mentioned, when reasonably determining printing color-sequential in technique, in order that chromatography operation is smooth
Carry out and obtain preferable colouring effect, this final structure choice black printing branch, cyan print branch, magenta printing
Branch and yellow printing branch are arranged in order the design of setting.Reach this four-color process structure by above two design
Best printing effect.
Further, there is a spindle nose at described roller core both ends respectively, and spindle nose passes through an external screw thread connecting shaft with roller core
Connection, the external screw thread connecting shaft are integrally formed with the spindle nose, and two spindle noses of the roller core are connected to by bearing respectively
The drive mechanism and transmission mechanism of the word double exposure device based on four-color process, are provided with containment member between spindle nose and bearing.
The structure further ensures the replaceability of ink transfer rubber roll, improves the flexibility ratio that machinery uses.Due to drive mechanism and biography
Motivation structure is techniques known, as long as reaching the purpose that can rotate roller core, all machines that can realize the function
Tool structure all should be fallen into the range of drive mechanism described in the utility model and transmission mechanism.
Further, the rubber layer uses nitrile rubber, thickness 2-3cm.The containment member uses rubber seal
Circle.Described upper ink transfer rubber roll and the inwall of lower ink transfer rubber roll are provided with heat sink strip.Described chart driving mechanism is conveyer belt, transmission
One kind in roller group or paper sucking machine.Described upper ink transfer rubber roll and lower ink transfer rubber roll are connected with print cartridge respectively.Described liquid level passes
Sensor is area array CCD liquid level sensor.
Although embodiment of the present utility model is disclosed as above, it is not restricted in specification and embodiment
Listed utilization, it can be applied to various suitable fields of the present utility model completely, for those skilled in the art,
Other modification is easily achieved, therefore under the universal limited without departing substantially from claim and equivalency range, this reality
Specific details is not limited to new and shown here as the legend with description.In addition it should be noted that the utility model only
The disclosed mechanical structure of protection, and other transmission mechanisms, computer program needed for mechanical structure work etc. are because being this
The known content of art personnel, all mechanisms that can reach this purpose and software can coordinate the utility model device to use.
Claims (8)
1. a kind of preset ink brush device of computer based on four-color process, including paper feed portion（1）, chart driving mechanism（9）, four colors print
Brush portion and paper delivery portion（6）, it is characterised in that：Four-color process portion both ends set paper feed portion and paper delivery portion respectively, it is described enter
Chart driving mechanism is all connected between paper portion and paper delivery portion and four-color process portion, the four-color process portion includes black printing branch
（2）, cyan print branch（3）, magenta printing branch（4）And yellow printing branch（5）, the black printing branch, green grass or young crops
Color printing branch, magenta printing branch and yellow printing branch are arranged in order setting；It is all provided with inside the four-color process portion
It is equipped with ink transfer rubber roll（7）, lower ink transfer rubber roll（8）, printing gap is provided between the upper ink transfer rubber roll and lower ink transfer rubber roll,
The upper ink transfer rubber roll and lower ink transfer rubber roll include the roller core that outer surface is wrapped with rubber layer respectively, and roller core is cylindrical cavity, roller
The lattice structure of through-hole type is evenly arranged with the cavity wall and rubber layer of core（10）；Described lattice structure is formed with four points
Parallelogram be uniformly arranged on the cavity wall of roller core for elementary cell；The dot matrix of the roller core of described black printing branch
The acute angle of parallelogram is 45 ° in the elementary cell of structure；The base of the lattice structure of the roller core of described cyan print branch
The acute angle of parallelogram is 15 ° in this unit；The elementary cell of the lattice structure of the roller core of described magenta printing branch
The acute angle of middle parallelogram is 75 °；Parallel four in the elementary cell of the lattice structure of the roller core of described yellow printing branch
The acute angle of side shape is 90 °；The through-hole diameter of the lattice structure of described black printing branch is the dot matrix knot of cyan print branch
1.1 times of the through-hole diameter of structure；The dot matrix knot of described cyan print branch, magenta printing branch and yellow printing branch
The through-hole diameter of structure is equal, and the cylindrical cavity both sides of described roller core are separately installed with preset print cartridge（15）, preset print cartridge is
Rectangular parallelepiped structure, the inwall side of preset print cartridge are provided with liquid level sensor（16）；In preset print cartridge, the cylindrical empty with roller core
Chamber link position（18）Reverse position cylinder is installed（17）；Cylinder and liquid level sensor are connected by wireless signal and computer
Connect.
A kind of 2. preset ink brush device of computer based on four-color process according to claim 1, it is characterised in that：Institute
The dot matrix of the ink transfer rubber roll of black printing branch, cyan print branch, magenta printing branch and the yellow printing branch stated
The base of parallelogram is equal in the elementary cell of structure；Described black printing branch, cyan print branch, magenta print
Parallelogram is high equal in the elementary cell of the lattice structure of the ink transfer rubber roll of brush branch and yellow printing branch.
A kind of 3. preset ink brush device of computer based on four-color process according to claim 2, it is characterised in that：Institute
There are a spindle nose, spindle nose in the roller core both ends stated respectively（14）Axis connection, the external screw thread are connected by an external screw thread with roller core
Connecting shaft is integrally formed with the spindle nose, and two spindle noses of the roller core pass through bearing respectively（13）Four colors are based on described in being connected to
The drive mechanism of the word double exposure device of printing（11）And transmission mechanism（12）, containment member is provided between spindle nose and bearing.
A kind of 4. preset ink brush device of computer based on four-color process according to claim 3, it is characterised in that：Institute
State rubber layer and use nitrile rubber, thickness 2-3cm.
A kind of 5. preset ink brush device of computer based on four-color process according to claim 4, it is characterised in that：Institute
State containment member and use rubber seal.
A kind of 6. preset ink brush device of computer based on four-color process according to claim 5, it is characterised in that：Institute
The upper ink transfer rubber roll and the inwall of lower ink transfer rubber roll stated are provided with heat sink strip.
A kind of 7. preset ink brush device of computer based on four-color process according to claim 6, it is characterised in that：Institute
The chart driving mechanism stated is one kind in conveyer belt, transfer roller groups or paper sucking machine.
A kind of 8. preset ink brush device of computer based on four-color process according to claim 7, it is characterised in that：Institute
The liquid level sensor stated is area array CCD liquid level sensor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720786225.3U CN207059436U (en) | 2017-07-02 | 2017-07-02 | A kind of preset ink brush device of computer based on four-color process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720786225.3U CN207059436U (en) | 2017-07-02 | 2017-07-02 | A kind of preset ink brush device of computer based on four-color process |
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| CN207059436U true CN207059436U (en) | 2018-03-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111300985A (en) * | 2018-12-11 | 2020-06-19 | Oppo广东移动通信有限公司 | Cover plate, display screen assembly, mobile terminal and method of making the cover plate |
| CN111746095A (en) * | 2020-05-28 | 2020-10-09 | 江苏凯特尔新型复合饰材有限公司 | Method for reducing printing color difference of metal printing plate and printing equipment thereof |
-
2017
- 2017-07-02 CN CN201720786225.3U patent/CN207059436U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111300985A (en) * | 2018-12-11 | 2020-06-19 | Oppo广东移动通信有限公司 | Cover plate, display screen assembly, mobile terminal and method of making the cover plate |
| CN111746095A (en) * | 2020-05-28 | 2020-10-09 | 江苏凯特尔新型复合饰材有限公司 | Method for reducing printing color difference of metal printing plate and printing equipment thereof |
| CN111746095B (en) * | 2020-05-28 | 2021-11-09 | 耿凯 | Method for reducing printing color difference of metal printing plate and printing equipment thereof |
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