CN103057289A - High-precision offset printing method - Google Patents
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Abstract
A high-precision offset printing method applies production standardized digital methods and means to create model development software so as to eliminate errors resulting from different used equipment and materials, is quite convenient and effective for operation of error correction and is an innovation and development of control theories of an offset printing technology. The technical architecture of the high-precision offset printing method includes a high-precision screening color separation technology, a high-density printing reproduction technology, a high-saturation printing reproduction technology, a long-contrast-level reproduction technology, a color management control technology and high-precision offset printing technical standards. Printed matters produced by applying the high-precision offset printing technology have the advantages of high precision, bright color, strong stereoscopic impression, good light impression and the like, technical indexes of the high-precision offset printing method conform to current international and national standard systems, index value exceeds standard expectations, quality bottlenecks of the traditional offset printing technology are broken through, and the offset technology portion makes up defects of existing printing theories and technologies.
Description
Technical field
The present invention relates to offset printing process, specifically a kind of fine offset printing method.
Technical background
During the nearly last ten years, billions of units are costed by printing enterprise, introduced large quantities of seals with international most advanced level before, printing, Postpress and Print Finishing, wherein aspect offset printing, also introduced the sophisticated equipment of large quantities of world-renowned manufacturers.But from actual operating position, general effect is not very desirable, not only there are larger gap in print quality and equipment benefit with external, Hong Kong, and with domestic press developed regions, compare such as Shenzhen, Shanghai and other places and also to exist obvious gap, thereby caused a large amount of high quality fine printings professional (approximately 500,000,000 yuan) outflow.Trace it to its cause, particularly in conjunction with this enterprise practical, there are a lot of difficulties in the crucial printing enterprise that just is digesting and assimilating of implementing process technology to the digesting and assimilating of introducing equipment, and forms the inharmonious situation of " flow device, second-rate product, three stream benefits ".
Summary of the invention
The present invention proposes a kind of fine offset printing method, to overcome the above-mentioned deficiency that exists, use production regularization, datumization ways and means, model of creation develops software to eliminate the error that causes because of use equipment, material difference, and operation is very easy for round-off error, effectively, be innovation and the development of offset printing control theory, its technological architecture is: fine screening color separation printing technology, high density print reproduction technology, high saturation print reproduction technology, long tint hierarchy reproduction technology, color management control technology, high-precision offset printing standard; Use the printed matter that high-precision offset printing is made, have high-precision clear, color is beautiful, third dimension is strong, advantage and the characteristics such as the light sense is good, its technical indicator meets the existing world, national standard system, the expection that is above standard of its desired value, broken through the quality bottleneck of traditional offset printing, this offset printing has partly remedied the shortcoming of original printing theory and technology.Purpose of the present invention is step in the following order:
1, adopt the fine screening technology: more than the am screening 300LPI, 9～21 microns of fm screenings, hybrid screening printing technology.
2, adopt high density print reproduction technology: the high density D of four-color process product
Max=2.0～2.4.
3, adopt high saturation print reproduction technology: needing also needs to use the CIELAB colour difference formula with Achromatic Color Reproduction GCR technology UCA under color addition technique, revises the synthetic Mathematical Modeling of color color separation and printing.
4, adopt long tint hierarchy reproduction technology: use long tint hierarchy reproduction technology can be reproduced dot area percentage 2～96% fully at printed matter site, the dot gain value at 50% place is less than 16%.
5, adopt the color management control technology: select typical color management module (CMM) to do test and use good site error concealment technology, use high-precision offset printing, E is less than 2.5 for printed matter color deviation delta.
6, high-precision offset printing index: high-precision offset printing desired value shown in table 1, table 2,
| Screen frequency | 9～21 microns of frequency | Amplitude modulation | 300 netting twine/inches |
| Printed matter print contrast (C) | Greater than 49% | Greater than 49% | |
| Printed matter print contrast (M) | Greater than 50% | Greater than 50% | |
| Printed matter print contrast (Y) | Greater than 35% | Greater than 35% | |
| Printed matter print contrast (K) | Greater than 47% | Greater than 47% | |
| Printed matter field density (C) | 1.55-1.60 | 1.55-1.60 | |
| Printed matter field density (M) | 1.50-1.55 | 1.50-1.55 | |
| Printed matter field density (Y) | 1.12-1.2 | 1.12-1.2 | |
| Printed matter field density (K) | 1.80-1.90 | 1.80-1.90 | |
| The dot gain rate (C) at |
≤14% | ≤15% | |
| The dot gain rate (M) at |
≤14% | ≤15% | |
| The dot gain rate (Y) at |
≤14% | ≤15% | |
| The dot gain rate (K) at |
≤14% | ≤16% | |
| The reproduction range of printed matter contrast (C) | 2%—96% | 2%—96% | |
| The reproduction range of printed matter contrast (M) | 2%—96% | 2%—96% | |
| The reproduction range of printed matter contrast (Y) | 2%—96% | 2%—96% | |
| The reproduction range of printed matter contrast (K) | 5%—93% | 5%—93% | |
| The value of chromatism Δ Ea*b*(C of bar printing primary colors on the spot) | Deviation is less than 2.0 | Deviation is less than 2.0 | |
| The value of chromatism Δ Ea*b*(M of bar printing primary colors on the spot) | Deviation is less than 2.0 | Deviation is less than 2.0 | |
| The value of chromatism Δ Ea*b*(Y of bar printing primary colors on the spot) | Deviation is less than 2.0 | Deviation is less than 2.0 | |
| The value of chromatism Δ Ea*b*(K of bar printing primary colors on the spot) | Deviation is less than 2.5 | Deviation is less than 2.5 |
The high-precision offset printing index of table 1
Table 2 chromatography franchise
Described stock is selected a kind of in purple emerging paper, Jin Dongzhi, the sun paper.
Beneficial effect:
1. project adopts printing house raw material commonly used to develop research, copies therefore printing enterprise adopts this project technical data to carry out the high quality printing product, and production cost is low.
2. this project technology adopts printing house raw material commonly used, and production cost is low, and buying easily.Its project technical data system utilizes the multicolour offset press with the CP window to print experiment, is fit to be applied to the actual production of enterprise.
3. improved the resolution ratio of image, the slight level of picture than the common screening slight level of represent images more exactly, has strengthened the true feeling of writing of original copy.
4. the distance of distinct vision is observed general printed matter harsh feeling, the fine degree of the printed matter of project fabrication techniques is approximate photochrome then, the level and smooth contrast of energy reproducing, given prominence to the texture of object, such as the transparent feel of glass, the reflecting feel of metal, the soft and moist sense of personage's colour of skin, the life sense of string etc., reproduced, expressive force promotes to some extent life-likely.
5. conventional netting twine (200LPI is following) printed matter because moire and rose spot easily appear in the problem of angle of halftone screen line, affects the continuity of picture contrast, picture is looked seem coarse.And the printed matter of project fabrication techniques has been eliminated this drawback.
6. the printed matter of project fabrication techniques, because screen frequency is fine and closely woven, the density of twice look (RGB) double exposure part is high, bright, the tonal density of middle tone and shadow has improved the colour developing effect of image also than the height of conventional netting twine.
7. the printed matter of project fabrication techniques has made human eye can not differentiate two adjacent sites, and this just gives eyes with illusion, and what feel to see is continuous toned image.
Description of drawings
Fig. 1 screening printing curves.
Fig. 2 printing curves.
Fig. 3 dot gain curve.
Fig. 4 print reproduction curve.
The specific embodiment
Embodiment 1:
Printing overall process data acquisition and analysis
1) ink paper performance and adaptive matching data gather
1. adopt X-RITE530 light splitting Density Measuring Instrument to the test of each color ink kind color attribute, the apolegamy of three-colour printing ink, test and the allotment of operation adaptive;
2. the mensuration of the printability data of main paper grades;
3. the test of printing operation adaptive and adaptive are processed, and list records is for the apolegamy of different product object.
2) adjustment of printing press performance
1. the adjustment of each behavior in service of printing machine and impression precision;
2. the DCO detailed checkout adjustment of cylinder dressing;
3. the test of squeegee pressure scope, the determining of desirable squeegee pressure.
3) test of printing operation data and control
1. under concrete printing equipment, printing ink, the paper matching requirements, can reach the mensuration of the highest printing relative contrast value (K value), the data test of the lower China ink layer of the highest K value density, dot gain value and little dot reproduction, the definite and stable control of basic ink supply amount;
2. determine process color order, the double exposure time of test ink layer drying regime the best and ink trapping efficient of all kinds;
3. concrete ink paper is reaching best printing operation data: China ink layer density, dot gain value are measured it and are printed the grey balance rendering data during with double exposure efficient;
4. use test control strip and tester are stablized control to the operation that reaches best printed data;
5. describe the printing net-point contrast and enlarge curve, single color printing contrast density curve and double exposure contrast density reproduction curve.
The test of 4) digital sample printing data is with definite;
1. select suitable digital sample printing machine and color management software;
2. utilize tester, select dissimilar print paper, test is also worked out the black discharge curve that is fit to;
3. utilize tester, make simulation curve and the paper general view file of proof press according to the standard printed data.
4. the digital specimen page of drawing a design is estimated Linear fine tuning to proof press;
5. with digital specimen page and print sample contrast, digital specimen page 95% above simulate press specimen page.
The test control of 5) printing down data
1. test the developing time of concrete plate, developer solution and the best fit data of temperature.And test out developer solution decay and supplementary data;
2. test the corresponding data of plate dot reproduction degree and light exposure;
3. use the stable of signal strips control printing down site transferring data.
6) the site translation data of film
The high contrast coefficient of test photosensitive material and developer solution is determined optimum development time; Development temperature, and density and light exposure relation data and offset data.
7) set up site tint hierarchy facsimile log derivation graph
The offset printing process is a color and site transmittance process.Therefore, how to control the dot gain of printed matter in critical field, become the application's research emphasis.Control the reduction of printed matter site well, also just controlled the key of printing machine reduction printed matter level and grey balance well.
For general printed matter, dot gain all can be in critical field, and for meticulous printed matter, easily lose little site, and dot gain is serious during the net-point printing of middle tone, during the net-point printing of shadow 82% place begin and level and dot gain serious.Can be found out by Fig. 1-4, printed matter contrast reproduction range is 2%-82%, and tone value is that the contrast at 50% place is increased to 22%, and this index does not reach national standard.
The printing contrast density curve that rear operation is surveyed and drawn, printing net-point contrast enlarge curve, grey balance proportional curve, middle operation site contrast transformation curve etc. and integrate, make screening color separations plate-making site tint hierarchy facsimile log and derive, as technological design and electronic scanning adjustment according to data.
8) basic data of device of color separation test
1. the test adjustment of device of color separation normal operating conditions;
2. the test of developing machine and adjustment, device of color separation record linearisation test and compensation;
3. the basic data of the every image inpainting function of device of color separation is tested and Drawing of Curve;
4. scanning thoroughly, reflection colour code and grey balance step-wedge, draw a design by both given data, draw color correction curve and the grey balance site proportional curve of standard.
9) measurement and analysis of data of colored original
1. press the original copy type; Tint hierarchy, tone, definition, graininess etc. are classified;
2. original copy is carried out meticulous coloured light density measure, draw three color density curves, and the tint hierarchy distribution curve;
3. carry out original copy tint hierarchy and color tone status analysis, reproduce matter, amount and customer requirement according to product, imagine and concrete original copy proposed copy the adjustment direction, find out method of adjustment and measure.
10) carry out normalized technological design
1. by copying object, product requirement, deisgn product specification format.Determine equipment and the raw material of use, technological process reasonable in design.Formulate each process operations data and quality standard;
2. according to concrete master copy data, tint hierarchy analysis and tone analysis, combination product reproduces requirement, and design is described the printing density tint hierarchy and reproduced curve, derivation site tint hierarchy facsimile log.To the colour cast original copy, also should design the adjustment grey balance level facsimile log of correcting colour cast;
3. according to quality conditions such as the contrast of concrete original copy, color, definition, later operation data are foundation, design every calibration and the necessary image inpainting data of color separation.
11) carry out the color separation adjustment by authority data
1. according to the selected data scaling of technological design;
2. level copies adjustment, black print and undercolour removal, corrects the grey balance level adjustment of original copy colour cast etc., should derive curve as foundation take technological design;
3. facsimile log or the standard color correction curve that provides take the device of color separation color management system, the original copy Color Replication requires and standard colour chart as foundation, carry out the color correction adjustment;
4. emphasize the data that cooperate of function according to original copy definition and graininess, device of color separation definition, and the definition of image copies requirement, carry out definition and emphasize to adjust;
5. by the technological design instruction, carry out the picture record layout and set.
12) research of the raw-material grey balance data of printing employing
Realizing the correct basis of reproducing of color when grey balance is color separation, if can not realize grey balance during color separation, is grey no longer just after then the grey in the original copy copies, and certainly leads to the colour cast phenomenon.
Theoretical according to the subtractive process colour generation, C, M, the different sites of Y three-colour printing ink ratio produce the grey of different lightness when superimposed.But because the actual printing ink that uses can not obtain neutral ash after in defective or difference that the aspects such as form and aspect, lightness, saturation degree exist, making the three-colour printing ink of equivalent superimposed.Present accurately grey for after making three-colour printing ink superimposed, just must change according to the factor that affects grey balance the dot area percentage of three-colour printing ink, realize grey balance.
The mensuration of printed data
Weigh quality that printed matter copies and mainly be and copy two aspects from the colour reproduction of image and tint hierarchy and estimate, tint hierarchy copies the number that depends primarily on the site in the unit are is connected the progression that connection changes with the site.It is more that the site changes progression, and printed matter level expressive force is stronger, seems finer and smoother; Site number in the unit are is more, and the definition of copying and printing product is higher, and level is abundanter, and color is more true to nature.Screen frequency is higher, and the site number in the unit are is just more, and the site progression that reproduces is just more.
The tester that high-precision offset printing demonstrative project experiment is adopted has the automatic scan spectrophotometer (X-Rite Dot DTP41 type) of plate dot meter (X-RiteDot DTP15 type), Ai Seli light splitting Density Measuring Instrument (530 type) and the color management special use of the production of U.S. X. Rite Inc..Dot meter is mainly measured the dot percentage of forme and the screen frequency of forme.The light splitting Density Measuring Instrument is mainly measured various parameters of the percentage of the density of each mass colour on the printing and print contrast, site and expansion value, double exposure rate, paper etc.Spectrophotometer is mainly used in the ICC color management of digital sample printing and CTP, and is used for measuring the Lab value of each signal strips color.
1, test environment
Hardware environment:
The light splitting Density Measuring Instrument of Ai Seli (530 type).
The plate dot meter of Ai Seli (X-RiteDot DTP15 type).
The special-purpose spectrophotometer (X-RiteDot DTP41 type) of the ICC color management of Ai Seli.
The hardware technology specification:
The technical specification of Ai Seli plate dot meter, light splitting Density Measuring Instrument and spectrophotometer.
Test environment: usually measure under daylight and fluorescent lamp, humiture, measuring method all meet the measurement standard of Ai Seli instrument.
2, technical indicator value
With reference to existing standard GB/T/T17934.2-1999 " the printing technology mesh is transferred the process control of burst, specimen page and printing finished product " (part 2: offset printing), the key technical indexes of identifying project is as follows:
1. screen frequency: 300 netting twine/inches;
2. contrast reproduction range: dot area percentage is that the site of 2%-96% can be reproduced on the printed matter fully;
3. contrast enlarges: tone value is that the contrast at 50% place increases less than 16%.
3, content measurement
1) content measurement before the seal
(1) digital sample printing machine ICC color management effect
(2) the publication linear compensation effect of CTP system.
(3) the slice linear compensation effect of CTF system.
(4) whether the dot percentage of forme and screen frequency be accurate.
2) content measurement of printed matter
(1) printing sheets parameter.
(2) ink density of all kinds on the printed matter.
(3) print contrast of each color ink of printed matter.
(4) sites at different levels value and the expansion value of signal strips of all kinds on the printed matter.
4, test data and result
(1) digital sample printing machine ICC color management effect: good.
(2) (do the ICC color management for the used ink color of project)
(3) the publication linear compensation effect of CTP system: good.
(forme site size only has 1% with the required site of experiment size deviation, and 2% to 98% site perfect reproduction all.The screen frequency of locating in 30% site (light color) is 304Lpi)
(4) the publication linear compensation effect of CTP system: good.
(forme site size only has 1% with the required site of experiment size deviation, and 2% to 98% site perfect reproduction all.The screen frequency of locating in 30% site (light color) is 303Lpi)
(5) measurement data and the evaluation analysis of project experiment 300Lpi printed matter:
See table 3, table 4, table 5, table 6 and table 7 for details.
The test of table 3 print contrast
The test of table 4 field density
The test of table 5 tone value 50% place's dot gain rate
The test of table 6 printed matter contrast reproduction range
Table 7 is the value of chromatism Δ Ea*b* of bar printing primary colors on the spot
| Printing ink | The A of country grade standard Δ Ea*b* | Printing actual measurement Δ Ea*b* |
| C | Deviation 5 | Deviation 2.0 |
| M | Deviation 8 | Deviation 2.5 |
| Y | Deviation 6 | Deviation 2.2 |
| K | Deviation 4 | Deviation 2.0 |
Claims (1)
1. fine offset printing method, carry out according to the following steps:
(1) fine screening: more than the am screening 300LPI, 9～21 microns of fm screenings, hybrid screening printing technology;
(2) high density print reproduction: the high density D of four-color process product
Max=2.0～2.4.
(3) high saturation print reproduction: needing also needs to use the CIELAB colour difference formula with Achromatic Color Reproduction GCR technology UCA under color addition technique, revises the synthetic Mathematical Modeling of color color separation and printing;
(4) long tint hierarchy copies: use long tint hierarchy reproduction technology can be reproduced dot area percentage 2～97% fully at printed matter site, the dot gain value at 50% place is less than 16%;
(5) color management control: select typical color management module (CMM) to do test and use good site error concealment technology, use high-precision offset printing, E is less than 2.5 for printed matter color deviation delta;
(6) high-precision offset printing index: high-precision offset printing desired value shown in table 1, table 2,
The high-precision offset printing index of table 1
Table 2 chromatography franchise
Described printed matter is selected a kind of in purple emerging paper, Jin Dongzhi, the sun paper.
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| CN103057289B CN103057289B (en) | 2016-07-06 |
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| CN103465624A (en) * | 2013-09-03 | 2013-12-25 | 天津市汇源印刷有限公司 | Novel prinking ink optimization method |
| CN103895377A (en) * | 2014-04-23 | 2014-07-02 | 深圳市国际彩印有限公司 | Multi-dimensional image printing technology |
| CN108357225A (en) * | 2018-01-26 | 2018-08-03 | 陕西科技大学 | A kind of determination method of the best field density of printed matter |
| CN109278398A (en) * | 2018-09-10 | 2019-01-29 | 河南省防伪保密印刷公司（河南省邮电印刷厂） | A kind of digitization color management system and method |
| CN109605969A (en) * | 2018-12-29 | 2019-04-12 | 星光印刷（苏州）有限公司 | A kind of fine Dot Color control method |
| CN110978825A (en) * | 2019-11-29 | 2020-04-10 | 苏州美盈森环保科技有限公司 | Ultra-clear offset printing method |
| CN111267467A (en) * | 2020-03-02 | 2020-06-12 | 中国印刷科学技术研究院有限公司 | Offset printing standard test plate and production and application method thereof |
| CN112297667A (en) * | 2020-09-29 | 2021-02-02 | 星光印刷（苏州）有限公司 | Color gamut frequency modulation screen printing process based on XCMYK expansion |
| CN114393922A (en) * | 2021-12-27 | 2022-04-26 | 杭州电子科技大学温州研究院有限公司 | Newspaper printing color management method |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103465624A (en) * | 2013-09-03 | 2013-12-25 | 天津市汇源印刷有限公司 | Novel prinking ink optimization method |
| CN103465624B (en) * | 2013-09-03 | 2015-09-16 | 天津市汇源印刷有限公司 | A kind of novel printing ink optimization |
| CN103895377A (en) * | 2014-04-23 | 2014-07-02 | 深圳市国际彩印有限公司 | Multi-dimensional image printing technology |
| CN108357225B (en) * | 2018-01-26 | 2019-11-26 | 陕西科技大学 | A kind of determination method of the best field density of printed matter |
| CN108357225A (en) * | 2018-01-26 | 2018-08-03 | 陕西科技大学 | A kind of determination method of the best field density of printed matter |
| CN109278398A (en) * | 2018-09-10 | 2019-01-29 | 河南省防伪保密印刷公司（河南省邮电印刷厂） | A kind of digitization color management system and method |
| CN109605969A (en) * | 2018-12-29 | 2019-04-12 | 星光印刷（苏州）有限公司 | A kind of fine Dot Color control method |
| CN110978825A (en) * | 2019-11-29 | 2020-04-10 | 苏州美盈森环保科技有限公司 | Ultra-clear offset printing method |
| CN110978825B (en) * | 2019-11-29 | 2022-01-18 | 苏州美盈森环保科技有限公司 | Ultra-clear offset printing method |
| CN111267467A (en) * | 2020-03-02 | 2020-06-12 | 中国印刷科学技术研究院有限公司 | Offset printing standard test plate and production and application method thereof |
| CN112297667A (en) * | 2020-09-29 | 2021-02-02 | 星光印刷（苏州）有限公司 | Color gamut frequency modulation screen printing process based on XCMYK expansion |
| CN114393922A (en) * | 2021-12-27 | 2022-04-26 | 杭州电子科技大学温州研究院有限公司 | Newspaper printing color management method |
| CN114393922B (en) * | 2021-12-27 | 2023-09-29 | 杭州电子科技大学温州研究院有限公司 | Color management method for newspaper printing |
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