CN113002204B - Printing method for improving color uniformity of ink - Google Patents
Printing method for improving color uniformity of ink Download PDFInfo
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- CN113002204B CN113002204B CN202110178039.2A CN202110178039A CN113002204B CN 113002204 B CN113002204 B CN 113002204B CN 202110178039 A CN202110178039 A CN 202110178039A CN 113002204 B CN113002204 B CN 113002204B
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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
- B41M1/12—Stencil printing; Silk-screen printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F19/00—Apparatus or machines for carrying out printing operations combined with other operations
- B41F19/008—Apparatus or machines for carrying out printing operations combined with other operations with means for stamping or cutting out
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/0036—Devices for scanning or checking the printed matter for quality control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
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- Spectrometry And Color Measurement (AREA)
Abstract
The invention provides a printing method for improving color uniformity of printing ink, which comprises the following steps: A. carrying out channel color separation on the original manuscript by adopting color separation software to obtain a black color separation file; B. marking a part which is easy to generate color difference on the original to obtain a color difference area, and converting the color difference area into a spot color separation file; C. deleting a color difference area on the original and continuously adopting color separation software to carry out channel color separation on the rest part of the original to obtain cyan, magenta and yellow color separation files; D. respectively manufacturing screen plates corresponding to black, spot color, cyan, magenta and yellow color separation files; E. specific special ink is modulated aiming at the color difference area; F. and respectively installing each screen printing plate on a printing roller and adding corresponding ink into the pigment box for printing. By marking the color difference area, the interference of color dots caused by software color separation is avoided, and the light color system and the purple color system are more accurately expressed, so that the whole color is uniform and consistent.
Description
Technical Field
The invention relates to the field of printing, in particular to a printing method for improving the color uniformity of ink.
Background
In conventional printing, a color separation software is generally used to perform color separation on an original to produce cyan, magenta, yellow and black screens; and adding corresponding ink during printing, and sequentially stamping the printing paper by each screen printing plate to obtain a printed matter according with the colors of the original manuscript. For some colors, such as light color and purple color, the color is easily lost during printing due to the small number of screen dots, so that the color deviates and generates color difference. The general solution is to print these colors as spot colors individually in one plate; most of the original manuscripts of customers are synthesized pictures with special effect shadows, so that the software color separation and layering are inconvenient to directly conduct, and the software special color separation easily enables the dots of each color to generate interference, and needs a large amount of time for later adjustment.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the printing method for improving the color uniformity of the ink is simple to operate and capable of ensuring the color uniformity.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a printing method for improving color uniformity of ink, comprising the steps of:
A. carrying out channel color separation on the original manuscript by adopting color separation software to obtain a black color separation file;
B. marking a part which is easy to generate color difference on the original to obtain a color difference area, and converting the color difference area into a spot color separation file;
C. deleting a color difference area on the original and continuously adopting color separation software to carry out channel color separation on the rest part of the original to obtain cyan, magenta and yellow color separation files;
D. respectively manufacturing corresponding screen printing plates for the obtained black, spot color, cyan, magenta and yellow color separation files through plate making equipment;
E. specific exclusive ink is modulated aiming at the chromatic aberration area;
F. and respectively installing each screen printing plate on a printing roller and adding corresponding ink into the pigment box for printing.
The invention has the beneficial effects that: firstly, carrying out color separation on an original to obtain a black color separation file, wherein the black color separation file is used as a special effect color of the original and is reflected in special effect shadows and the like of the original; the part which is easy to generate color difference is marked into a color difference area, and the color difference area is independently converted into a special color separation file, so that the process does not adopt software color separation, and the interference of color dots caused by the software color separation is avoided; continuously carrying out color separation on the original manuscript on the basis of deleting the color difference area, and manufacturing a screen printing plate and printing ink with various colors; during printing, common colors of black, cyan, magenta and yellow can be matched with each other to correspond to various colors and special effects on the original, and light colors and purple colors are accurately expressed by spot colors without adjusting color dot interference in the later period.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description will be given with reference to the embodiments.
A printing method for improving color uniformity of ink comprising the steps of:
A. carrying out channel color separation on the original manuscript by adopting color separation software to obtain a black color separation file;
B. marking a part which is easy to generate color difference on the original manuscript to obtain a color difference area, and converting the color difference area into a spot color separation file;
C. deleting a color difference area on the original and continuously adopting color separation software to perform channel color separation on the rest part of the original to obtain cyan, magenta and yellow color separation files;
D. respectively manufacturing corresponding screen printing plates for the obtained black, spot color, cyan, magenta and yellow color separation files through plate making equipment;
E. specific special ink is modulated aiming at the color difference area;
F. and respectively installing each screen printing plate on a printing roller and adding corresponding ink into the pigment box for printing.
As can be seen from the above description, the beneficial effects of the present invention are: firstly, carrying out color separation on an original to obtain a black color separation file, wherein the black color separation file is used as a special effect color of the original and is reflected in special effect shadows and the like of the original; the part which is easy to generate color difference is marked into a color difference area, and the color difference area is independently converted into a special color separation file, so that the process does not adopt software color separation, and the interference of color dots caused by the software color separation is avoided; continuously carrying out color separation on the original manuscript on the basis of deleting the color difference area, and manufacturing a screen printing plate and printing ink with various colors; during printing, common colors of black, cyan, magenta and yellow can be matched with each other to correspond to various colors and special effects on the original, and light colors and purple colors are accurately expressed by spot colors without adjusting color dot interference in the later period.
Further, the specific operations of "marking a part of the original document that is easy to generate color difference to obtain a color difference region, and converting the color difference region into a spot color separation file" in the step B include:
the color difference part on the original after the black separation is subjected to drawing to obtain the shape of the color difference area; filling and covering colors in the color difference area; and separating the filling colors according to the filled colors and converting the filling colors into spot color separation files.
According to the description, the accurate shape of the color difference area is obtained by outlining the color difference area, and the color filling is utilized to enable the color difference area to be independent of other colors, so that the color difference area is convenient to select and convert.
Further, the filled color is a color which can be clearly distinguished from the periphery of the color difference area.
As can be seen from the above description, the colors of the fills are easily distinguishable for easy operator selection.
Further, the method also comprises the following steps after the step A:
b, copying the black original manuscript separated in the step A to obtain a copied manuscript;
the following steps are also included after the step B:
opening the spot color separation file obtained in the step B, overlapping the color difference area of the spot color separation file with the color difference area of the copy manuscript, checking whether the image outside the color difference area is interfered or not, and further adjusting the outline of the color difference area.
As can be seen from the above description, the contour with error is corrected by the registration comparison with the copy document, and the subsequent printing quality is ensured.
Further, the specific operation of "modulating the specific dedicated ink for the color difference region" in the step E is specifically: and detecting the chromaticity of the color in the color difference area on the sample corresponding to the original through an Alice spectral densitometer, matching the chromaticity with the ink quantities of cyan, magenta and yellow inks according to the obtained chromaticity value, and mixing the inks to obtain the exclusive ink.
As can be seen from the above description, the exclusive ink is prepared by measuring the color through an Alice densitometer, matching the obtained chromaticity value with the inks of the various colors, and mixing and modulating.
Furthermore, the special ink is also added with detackified oil, drying oil, white ink and gold and silver ink in a certain proportion.
The description shows that the detackified oil and the drying oil added into the special ink can enable the special ink to be quickly attached to printing paper and to be quickly dried, and the white ink and the gold and silver ink can be more accurately used for expressing the required color.
Further, the method also comprises the following steps before the step A:
before cutting paper, a cutter knife for cutting the paper is regularly sharpened;
coating a layer of thinner grease on the cutting edge of the cutting knife;
cutting the size of the printing paper by grinding a sharp cutting knife so as to adapt to the size of the original manuscript;
and (4) removing paper powder and static electricity of the cut printing paper, stacking the paper at a paper inlet of the printing machine, and inputting the paper into the printing machine through a paper feeding device.
According to the description, the knife grinding process of the cutting knife can avoid paper powder generated during paper cutting and influence on the adhesion of ink on the surface of the printing paper; the oil film on the blade can be attached to the cutting edge of the printing paper, so that the paper powder is firmly adsorbed and cannot fly around; the printing paper with accurate size is cut and sent into the printing machine through paper powder removing and static electricity removing treatment, wherein the paper powder removing treatment is carried out again, so that the interference of the paper powder to the ink adhesion is reduced, especially the static electricity removing treatment is carried out under the conditions that the cutting is good, the placement time is too long, and small foreign matters such as the paper powder are contaminated in the carrying process, so that the printing paper can be accurately input one by one, and a plurality of papers cannot be input simultaneously.
Further, the specific operations of paper powder removal and static electricity removal treatment are as follows:
coating oil on the cut edge of the stacked printing paper; the method comprises the following steps that an air blowing device blowing air towards the paper surface is arranged above printing paper, and the air blowing device blows air to the paper surface of the printing paper when the printing machine feeds the paper; a paper inlet of the printing machine is provided with a cotton brush, and the cotton brush seals the paper inlet on one side and is abutted against the paper surface of the printing paper.
As can be seen from the above description, the cut edges of the stacked printing paper are oiled to adsorb paper powder while preventing static electricity generated by friction of the printing paper; the blowing device which blows towards the paper surface of the printing paper is arranged for removing paper powder on the paper surface of the printing paper, and the cotton brush is used for adsorbing the paper powder and leveling the printing paper while cleaning the paper surface of the printing paper.
Further, the installation of each screen printing plate is in a certain sequence, wherein the sequence specifically comprises that cyan, magenta, yellow, spot color and black screen printing plates are sequentially placed into each group of printing rollers of the printing machine; the printing order is cyan, magenta, yellow, spot color, and black.
As can be seen from the above description, by printing in order from light to dark, interference between colors is avoided.
Further, the step F further includes the steps of:
the printing method comprises the following steps that test screen printing plates are arranged on each group of printing rollers, each test screen printing plate is provided with an ink color measuring area, the length direction of the ink color measuring areas of the test screen printing plates is gradually changed in thickness, the ink test areas of each test screen printing plate are mutually spaced, and the test screen printing plates are connected with the printing screen printing plates when the printing screen printing plates are installed to print a piece of printing paper;
in the printing process, the printing paper printed by each group of printing screens is extracted respectively, and the chromaticity of the ink color measuring area is detected; comparing the obtained chromaticity detection result with the chromaticity values of the various colors of the original, and if the color difference value of the two is within an allowable range, indicating that the original is qualified; if the color difference value of the two exceeds the allowable range, the adjustment is needed; and observing the printing conditions of the color measurement areas of the printing ink of the test screen with different thicknesses, and judging whether the thickness of the printing ink is qualified.
According to the above description, by setting the testing screen printing plates, a user can extract the printing paper printed by each group of printing screen printing plates in the printing process, and perform chromaticity detection on the ink color measuring areas passing through different printing screen printing plates; the thickness of the ink can be simultaneously tested by the testing screen plate with the gradually-changed thickness, and the excessive thickness of the ink is printed on the printing paper at the thinner part of the testing screen plate; according to the above detection result, various operation values of the printing machine, such as printing pressure, paper feeding speed, etc., are adjusted.
The first embodiment of the invention is as follows:
the printing method for improving the color uniformity of the ink comprises the following steps:
cut paper before printing is prepared.
Before cutting paper, a cutter knife for cutting paper is subjected to a knife sharpening process in a timing mode;
then coating a layer of thinner grease on the cutting edge of the cutting knife;
cutting the size of the printing paper by grinding a sharp cutting knife so as to adapt to the size of the original manuscript;
and (4) carrying out paper powder removal and static electricity removal treatment on the cut printing paper, stacking the paper in a paper inlet of the printing machine, and inputting the paper into the printing machine through paper feeding equipment. The specific operations of paper powder removal and static electricity removal treatment are as follows: coating oil on the cutting edge of the stacked printing paper; the method comprises the following steps that an air blowing device blowing air towards the paper surface is arranged above printing paper, and the air blowing device blows air to the paper surface of the printing paper when the printing machine feeds the paper; a paper inlet of the printing machine is provided with a cotton brush, and the cotton brush seals the paper inlet on one side and is abutted against the paper surface of the printing paper.
Color separation and printing of the original.
Carrying out channel color separation on the original manuscript by adopting color separation software to obtain a black color separation file;
and copying the original document with the black separated out to obtain a copied document.
And marking the part which is easy to generate color difference on the original to obtain a color difference area, and converting the color difference area into a spot color separation file. The specific operation is as follows: the color difference part on the original after the black separation is subjected to outlining of a color difference area to obtain the shape of the color difference area; filling and covering colors in the color difference area; and separating the filled colors according to the filled colors and converting the filled colors into spot color separation files. Wherein the color of the filling is a color which can be obviously distinguished from the periphery of the color difference area.
Opening the obtained spot color separation file, overlapping the color difference region of the spot color separation file with the color difference region of the copy manuscript, checking whether the image outside the color difference region is interfered and further adjusting the outline of the color difference region.
And deleting the color difference area on the original and continuously adopting color separation software to perform channel color separation on the rest part of the original to obtain cyan, magenta and yellow color separation files.
And respectively manufacturing corresponding screen printing plates for the black, spot color, cyan, magenta and yellow color separation files obtained by the steps through plate making equipment.
And specific special ink is prepared according to the color difference area. The specific operation is as follows: and detecting the chromaticity of the color of a color difference area on a sample corresponding to the original through an Alice spectrodensitometer, matching the chromaticity with the ink amounts of cyan, magenta and yellow inks according to the obtained chromaticity value, and mixing the inks to obtain the special ink. The special ink is also added with detackified oil, dry oil, white ink and gold and silver ink in a certain proportion.
Arranging test screens on each group of printing rollers, wherein each test screen is provided with an ink color measurement area, the length direction of the ink color measurement area of each test screen has gradually-changed thickness, the ink test areas of each test screen are mutually spaced, and the test screens are connected with the printing screens when the printing screens are installed to print a piece of printing paper together;
and respectively installing each screen printing plate on a printing roller and adding corresponding ink into the pigment box for printing. Installing each screen printing plate according to a certain sequence, wherein the sequence is to put cyan, magenta, yellow, spot color and black screen printing plates into each group of printing rollers of a printing machine in sequence; the printing order is cyan, magenta, yellow, spot color and black;
in the printing process, the printing paper printed by each group of printing screens is extracted respectively, and the chromaticity of the ink color measuring area is detected; comparing the obtained chromaticity detection result with the chromaticity values of the various colors of the original, and if the color difference value of the two is within an allowable range, indicating that the original is qualified; if the color difference value of the two exceeds the allowable range, the adjustment is needed; and observing the printing conditions of the color measurement areas of the printing ink of the test screen with different thicknesses, and judging whether the thickness of the printing ink is qualified.
In summary, according to the printing method for improving the color uniformity of the ink provided by the present invention, firstly, the original document is subjected to color separation to obtain a black color separation file, and the black color separation file is used as a special color of the original document and is reflected in a special shadow of the original document, etc.; the part which is easy to generate color difference is marked into a color difference area, and the color difference area is independently converted into a special color separation file, so that the process does not adopt software color separation, and the interference of color dots caused by the software color separation is avoided; continuously carrying out color separation on the original manuscript on the basis of deleting the color difference area, and manufacturing a screen printing plate and printing ink with various colors; during printing, common colors of black, cyan, magenta and yellow can be matched with various colors and special effects on a corresponding original, and light colors and purple colors are accurately expressed through spot colors without adjusting color dot interference in the later period; carrying out paper powder removing treatment and static electricity removing treatment for multiple times to ensure the adhesion of the printing ink during printing; setting a step of detecting the outline of the color difference area to ensure that the separation of the color difference area does not interfere with other colors; and setting a detection step in the printing process, and adjusting the chromaticity and the thickness of the printing ink according to a detection result to ensure the delivery quality of the printed matter.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention in the specification or directly or indirectly applied to the related technical field are included in the scope of the present invention.
Claims (9)
1. A printing method for improving color uniformity of ink, comprising the steps of:
A. carrying out channel color separation on the original manuscript by adopting color separation software to obtain a black color separation file;
B. marking a part which is easy to generate color difference on the original to obtain a color difference area, and converting the color difference area into a spot color separation file;
C. deleting a color difference area on the original and continuously adopting color separation software to perform channel color separation on the rest part of the original to obtain cyan, magenta and yellow color separation files;
D. respectively manufacturing corresponding screen printing plates for the obtained black, spot color, cyan, magenta and yellow color separation files through plate making equipment;
E. specific special ink is modulated aiming at the color difference area;
F. respectively installing each screen printing plate on a printing roller and adding corresponding ink into the pigment box for printing;
the specific operations of marking the part of the original document which is easy to generate color difference to obtain a color difference area and converting the color difference area into a spot color separation file in the step B are as follows:
the color difference part on the original after the black separation is subjected to outlining of a color difference area to obtain the shape of the color difference area; filling and covering colors in the color difference area; and separating the filling colors according to the filled colors and converting the filling colors into spot color separation files.
2. The printing method of claim 1 wherein the color of the fill is a color that is clearly distinguishable from the surrounding of the color difference region.
3. The printing method for improving the color uniformity of the ink according to claim 1, further comprising the following steps after the step A:
copying the black manuscript separated in the step A to obtain a copied manuscript;
the following steps are also included after the step B:
opening the spot color separation file obtained in the step B, overlapping the color difference area of the spot color separation file with the color difference area of the copy manuscript, checking whether the image outside the color difference area is interfered or not, and further adjusting the outline of the color difference area.
4. The printing method for improving the color uniformity of the ink according to claim 1, wherein the "special ink for color difference area modulation" in the step E is specifically performed by: and detecting the chromaticity of the color in the color difference area on the sample corresponding to the original through an Alice spectral densitometer, matching the chromaticity with the ink quantities of cyan, magenta and yellow inks according to the obtained chromaticity value, and mixing the inks to obtain the exclusive ink.
5. The printing method for improving the color uniformity of the ink according to claim 4, wherein the specific ink is further added with a certain proportion of de-sticking oil, drying oil, white ink and gold and silver ink.
6. The printing method for improving the color uniformity of the ink according to claim 1, further comprising the following steps before the step A:
before cutting paper, a cutter knife for cutting the paper is regularly sharpened;
coating a layer of thinner grease on the blade of the cutting knife;
cutting the size of the printing paper by grinding a sharp cutting knife so as to adapt to the size of the original manuscript;
and (4) removing paper powder and static electricity of the cut printing paper, stacking the paper at a paper inlet of the printing machine, and inputting the paper into the printing machine through a paper feeding device.
7. A printing method for improving color uniformity of ink according to claim 6, wherein the specific operations of paper dust removal and static electricity removal treatment are as follows:
coating oil on the cut edge of the stacked printing paper; an air blowing device for blowing air towards the paper surface is arranged above the printing paper, and the air blowing device blows air towards the paper surface of the printing paper when the printing machine feeds the paper; a paper inlet of the printing machine is provided with a cotton brush, and the cotton brush seals the paper inlet on one side and is abutted against the paper surface of the printing paper.
8. A printing method according to claim 1, wherein the screens are arranged in a sequence, in which cyan, magenta, yellow, spot and black screens are sequentially fed to the sets of printing rollers of the printing machine; the printing order is cyan, magenta, yellow, spot color, and black.
9. The printing method for improving the color uniformity of the ink according to claim 1, further comprising the following steps in the step F:
the printing method comprises the following steps that test screen printing plates are arranged on each group of printing rollers, each test screen printing plate is provided with an ink color measuring area, the length direction of the ink color measuring areas of the test screen printing plates is gradually changed in thickness, the ink test areas of each test screen printing plate are mutually spaced, and the test screen printing plates are connected with the printing screen printing plates when the printing screen printing plates are installed to print a piece of printing paper;
in the printing process, the printing paper printed by each group of printing screens is respectively extracted, and the chromaticity of the ink color measurement area is detected; comparing the obtained chromaticity detection result with chromaticity values of all colors of the original manuscript, and if the color difference value of the two is in an allowable range, indicating that the original manuscript is qualified; if the color difference value of the two exceeds the allowable range, the adjustment is needed; and observing the printing conditions of the color measurement areas of the printing ink of the test screen with different thicknesses, and judging whether the thickness of the printing ink is qualified.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1273910A (en) * | 2000-06-26 | 2000-11-22 | 佛山南方印染股份有限公司 | 4-colour synthetic true-colour printing technology for fabrics |
| US7256910B2 (en) * | 2002-04-23 | 2007-08-14 | Weyerhaeuser Company | Color separation method and printed product of the method |
| JP3925431B2 (en) * | 2003-02-28 | 2007-06-06 | セイコーエプソン株式会社 | Separation processing into a plurality of ink components including chromatic primary color ink and chromatic secondary color ink |
| US8351100B2 (en) * | 2008-05-28 | 2013-01-08 | Xerox Corporation | Method to create spot colors with white and CMYK toner and achieve color consistency |
| CN101446757B (en) * | 2008-12-24 | 2010-06-02 | 深圳华新彩印制版有限公司 | Electronic color separation method of printing process and printing process |
| JP2012525766A (en) * | 2009-04-28 | 2012-10-22 | サン・ケミカル・コーポレーション | Multi-color printing method and system using both process color and spot color in process ink set |
| CN103854294B (en) * | 2012-12-06 | 2018-05-22 | 北京大学 | A kind of automatic spot color separating method and system of printed matter based on colour cast analysis |
| JP5856593B2 (en) * | 2013-08-30 | 2016-02-10 | 富士フイルム株式会社 | Color separation apparatus, color separation method, and color separation program |
| CN103818099B (en) * | 2014-02-12 | 2015-12-09 | 太仓丽盛制版有限公司 | The spot color separating technique of intaglio printing decoration version |
| CN204340406U (en) * | 2014-11-29 | 2015-05-20 | 河南国花彩印包装有限公司 | A kind of paper surface cleaning device for printing machine |
| CN107105125B (en) * | 2017-04-13 | 2019-06-11 | 中山火炬职业技术学院 | Special color digital proofing method |
| TWM575586U (en) * | 2018-11-30 | 2019-03-11 | 海德保科技有限公司 | Printing system by using color separation digital technology |
| JP7230530B2 (en) * | 2019-01-25 | 2023-03-01 | コニカミノルタ株式会社 | COLOR SEPARATION TABLE CREATION METHOD, PROGRAM AND PRINTING DEVICE |
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