CN106891627B - A kind of method of determining newspaper printing fountain solution preset value - Google Patents
A kind of method of determining newspaper printing fountain solution preset value Download PDFInfo
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- CN106891627B CN106891627B CN201710053725.0A CN201710053725A CN106891627B CN 106891627 B CN106891627 B CN 106891627B CN 201710053725 A CN201710053725 A CN 201710053725A CN 106891627 B CN106891627 B CN 106891627B
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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
- B41M1/06—Lithographic printing
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Abstract
The invention discloses a kind of methods of determining newspaper printing fountain solution preset value.Method of the invention designs two sets of dedicated printing test charts, by print respectively the test space of a whole page close to blank and space of a whole page picture and text coverage rate be 40% when optimum dampener liquid dosage, establish the relationship between optimum dampener liquid dosage and space of a whole page picture and text area coverage, software is recycled to read the digital document of printing living-article, calculate the picture and text area coverage of each ink-covered area, according to relation function has been established, quantitatively determine fountain solution preset value, fountain solution dosage is preset by rule of thumb by worker compared to current newspaper printing, improve preset accuracy, it solves due to the preset inaccurate bring set-off of fountain solution or ink emulsification overscale problems.
Description
Technical field
The invention belongs to printing technologies, are related to a kind of preset method for determination of amount of newspaper printing fountain solution, specifically
It is a kind of according to printing machine characteristic and the image coverage feature of digital prepress file, determine when journalism rotary press prints newspaper
The method of fountain solution preset value.
Background technique
Lithographic printing, to the selection adsorpting characteristic of fountain solution, is first coated with wetting at the non-graphic position of printing plate using printing plate
Liquid, and picture and text position can not adhere to fountain solution, when being coated ink, ink is only coated on the picture and text position of printing plate.If printing
When fountain solution it is insufficient, cannot be effective over the non-graphic position of printing plate, it may appear that non-graphic position adheres to curing ink, causes
Blank position on stock is set dirty trace occur；But if fountain solution excess when printing, and will appear ink and excessively emulsify, it prints
Brush product mass colour is not bright-coloured, or even washmarking occurs, float the printing troubles such as dirty.For newspaper printing, since fountain solution supply is inclined
It is more, make the picture saturation degree of printing reduces, and ink setting is slack-off etc., is the FAQs for influencing newspaper printing quality.
Offset press before normal printing, need according to workshop condition, the performance characteristic of printing machine, paper and ink spy
Property, picture and text area distributions on the space of a whole page etc., it is appropriate that output ink quantity and wetting liquid measure are adjusted.Optimal fountain solution supply be
Picture and text position ink amount normal in size, and under the premise of blank position is not in dirty trace, it is reduced as far as the confession of fountain solution
Ying Liang, that is, printed matter blank position is close but does not reach boundary.Currently, many offset presses have been equipped with digitlization
Output ink quantity reset function, replace original with the preset output ink quantity of worker's experience, but existing offset press does not have number
The preparatory function of the output wetting liquid measure of change, the fountain solution preset value for needing worker to be arranged by rule of thumb.In printing process, wetting
The main Consumption of liquid has: evaporate, be coated on printing plate non-graphic position be then transferred to surface of the stock, be emulsified in ink again with
On printing ink transfer to stock.For sheet-fed offset press, as printing paper grades, size used in different living-articles not
Together, different to the absorbability of fountain solution, there are larger difficulties for preset wetting liquid measure；Journalism rotary press is printed and is reported
Paper, since workshop moisture temperature environment, printing machine performance, characteristic of paper and ink etc. are all in stable state, the width of paper
Face is also fixation, and when printing different living-articles, the principal element for influencing fountain solution reasonable demand amount is space of a whole page picture and text coverage rate
Difference, but picture and text area coverage is difficult to make accurate assessment by rule of thumb, therefore sometimes because of fountain solution supply
Deficiency, blank position scumming, and more commonly fountain solution dosage exceeds optimal demand, and influence newspaper printing quality.
Summary of the invention
The method that the present invention needs worker to preset fountain solution output quantity by rule of thumb for current newspaper printing is compared, and can be passed through
The digital document for reading current living-article, through calculating, the method for accurately determining optimal fountain solution preset value, thus solve by
In the preset inaccurate bring set-off of fountain solution or ink emulsification overscale problems, it is preset to propose a kind of determining newspaper printing fountain solution
The method of amount.
In order to solve the above technical problems, the present invention includes two sets of special design and printing test charts, a kind of journalism rotary printing
The calculation method of machine fountain solution preset value and a set of software for reading digital document and calculating fountain solution preset value again.Pass through printing institute
Test chart is stated, data is obtained and establishes the relationship between optimal fountain solution supply and space of a whole page picture and text area coverage, in newspaper
In print production, software reads the digital document of printing living-article, the picture and text area coverage of each ink-covered area is calculated, according to having been established
Relation function quantitatively determines the preset value of fountain solution；Two sets of special design and printing test charts include No.1 test chart and No. two
Test chart；
Described two sets print the No.1 test chart in test charts, are only with an ink-covered area width of printing machine containing one
Unit, each ink-covered area include the control strip of green, pinkish red, yellow, black four color color lump on the spot, and the length of control strip is ink-covered area width
Integral multiple contains most ink-covered area numbers under requirement of the length less than 2 centimetres of paper width or more, and control strip is along space of a whole page width side
To being placed centrally in the seaming position of the space of a whole page.No. two test charts in two sets of printing test charts, in addition to including and one
Number identical control strip of test chart is simultaneously set to outside identical position, also includes 50% that width is control strip width, height
It is yellow on the basis of the middle line of space of a whole page width direction for 40% black, green, pinkish red of plate cylinder perimeter, Huang Sise color lump on the spot
Color lump above left side, pinkish red color lump below left side, black block above right side, cyan block in lower right-hand side, yellow block and
The blank that 1 centimetre of spacing is kept between pinkish red color lump, keeps the blank of 1 centimetre of spacing, magenta between black block and cyan block
Block and cyan block keep the blank of 1 millimeter of spacing between control strip respectively.
The calculation method of the journalism rotary press fountain solution preset value specifically includes the following steps:
Step (1) makes No.1 test printing plate and No. two test printing plates using No.1 test chart and No. two test charts respectively.
No.1 described in step (2) installation steps (1) is tested on printing plate to journalism rotary press, and it is defeated to adjust four-color machine group
Amount out of ink and wetting liquid measure, make four color ink Color uniformities and chromatic value meet newspaper printing requirement, and on the spot edge it is close but
There is not set-off, records the fountain solution output quantity F of current each unit1.The four color ink Color uniformities and chromatic value meet
Newspaper printing requires to can be customized requirement, is also possible to the requirement as defined in the standards such as ISO 12647-3.
No. two test printing plates described in step (3) installation steps (1) adjust four-color machine group output ink quantity and wetting liquid measure,
Four color ink Color uniformities and chromatic value requirement are made to meet the requirement of newspaper printing described in step (2), and control strip edge is close
But there is not set-off, record the fountain solution output quantity F of current each unit2。
Step (4) reads in the digital document of living-article to be printed, is directed at printing machine with the space of a whole page width direction middle line of digital document
Axial centerline, as unit of an ink-covered area width of printing machine, to digital document carry out subregion, calculate the picture and text of each subregion
Area coverage, then the maximum ink-covered area of picture and text area coverage is found out, the picture and text area coverage of note picture and text area coverage maximum ink-covered area is
TSmax。
Step (5), multiplied by the perimeter of plate cylinder, is obtained the area of an ink-covered area, is denoted as S with the width of an ink-covered area.
Step (6) is with the picture and text area coverage TS of picture and text area coverage maximum ink-covered area described in step (4)maxDivided by step
(5) the area S of an ink-covered area described in, obtains the picture and text coverage rate of picture and text area coverage maximum ink-covered area, is denoted as t, determines step
(4) the fountain solution preset value F of the living-article to be printed described in are as follows:
Beneficial effects of the present invention: method of the present invention can according to printing living-article space of a whole page picture and text area coverage,
By calculating, accurately determines optimal fountain solution preset value, avoid leading to blank position scumming because fountain solution supply is very few, make
At waste of material；Or because caused by fountain solution excess ink emulsification it is excessive, cause dried slow, color saturation reduces
Deng influencing printing product quality.
Detailed description of the invention
Fig. 1 is the printing test chart one that the present invention designs；
Fig. 2 is the printing test chart two that the present invention designs.
Specific embodiment
The present invention is further described in detail with reference to the accompanying drawings and embodiments.
In lithography process, enough fountain solutions are on the one hand needed, prevent blank position scumming；On the other hand,
The presence of fountain solution will necessarily be emulsified with ink, to influence the saturation degree of ink, fountain solution supply is more, be emulsified tighter
Weight.At blank position under the premise of not scumming, the supply of fountain solution is reduced to the greatest extent, until approaching but not reaching set-off side
Boundary is only optimal fountain solution supply.The main Consumption of fountain solution in printing process has: evaporation, printing plate blank parts
Fountain solution be transferred to paper and be absorbed, three kinds of modes such as the fountain solution that is emulsified in ink is transferred on paper.Due to report
Generally there is stringent control in paper machine room to temperature and humidity, and it is relatively stable to evaporate the moisture content consumed；It is printed different from sheet-fed,
When journalism rotary press prints newspaper, the type and size of paper are usually fixed, used ink and to ink layer thickness
Requirement be also it is fixed, influence fountain solution supply principal element be the space of a whole page picture and text area coverage it is different, however version
The picture and text area coverage in face is difficult to visually evaluate, and therefore, the present invention proposes that one kind first passes through experiment test and establishes picture and text
The relationship of area coverage and optimum dampener liquid dosage determines reasonably further according to the picture and text area coverage of specific printing living-article
The method of fountain solution dosage.It avoids leading to blank position scumming because fountain solution supply is very few, causes waste of material；Or because of wetting
Liquid excess causes ink emulsification excessive, causes dried slow, and color saturation reduces, and influences printing product quality.
A kind of method of determining newspaper printing fountain solution dosage proposed by the present invention is surveyed comprising two sets of printings specially designed
Attempt, a kind of calculation method of journalism rotary press fountain solution preset value and a set of digital document that can read calculate fountain solution again
The software of preset value；By printing the test chart, acquisition data are established optimum dampener liquid supply and are covered with space of a whole page picture and text area
Relationship between lid rate, in the production of subsequent newspaper printing, the software reads the digital document of printing living-article, calculates each ink
The picture and text area coverage in area quantitatively determines fountain solution preset value according to relation function has been established.
Two sets of printing test charts designed by the present invention, No.1 test chart is as shown in Figure 1, for detecting in the space of a whole page close to blank
When required optimum dampener liquid supply；No. two test charts are as shown in Fig. 2, when being 40% for detecting space of a whole page picture and text coverage rate
The supply of required optimum dampener liquid.No.1 test chart only containing as unit of an ink-covered area width by printing machine,
Each ink-covered area includes the control strip of green, pinkish red, yellow, black four color on the spot, and the width of control strip is the integral multiple of ink-covered area width,
Meet under requirement of the length less than 2 centimetres of paper width or more containing most ink-covered area numbers, control strip is put between two parties in the width direction
It is placed in the seaming position of the space of a whole page.If the width of each ink-covered area of certain brand printing machine is 4 centimetres, cylinder circumference is 54 centimetres, institute
Printing newspaper width is 85 centimetres, then the width for designing control strip is 20 times of ink-covered area width, i.e., 80 centimetres wide, each ink-covered area contains
Green, pinkish red, yellow, black four color color lump on the spot, it is highly 0.8 centimetre, for evaluating and testing ink that the width of each color lump on the spot, which is 1 centimetre,
The size and uniformity of amount.
No. two test charts are in addition to also wrapping containing the identical control strip of above-mentioned No.1 test chart and other than being set to identical position
Black, green, pinkish red, Huang Sise containing large area color lump on the spot, the width of each color lump is equal to the width half of control strip, each
The height of color lump is the 40% of plate cylinder perimeter, and on the basis of the middle line of width direction, yellow block is above left side, magenta
Block is below left side, and for black block above right side, cyan block is kept for 1 centimetre between lower right-hand side, yellow block and pinkish red color lump
The blank of spacing, between black block and cyan block keep 1 centimetre of spacing blank, pinkish red color lump, cyan block respectively with control strip
Between keep 1 millimeter of spacing blank.Example as described above, color lump, every piece of width are black, green, pinkish red, Huang Sise on the spot
40 centimetres, it is highly 21.6 centimetres, is respectively arranged at position as shown in Figure 2.
The calculation method of journalism rotary press fountain solution preset value, specifically includes the following steps:
Step (1) makes No.1 test printing plate and No. two tests using the No.1 test chart and No. two test charts respectively
Printing plate.
Step (2) is installed on No.1 beta version to journalism rotary press, and four-color machine group output ink quantity and fountain solution are adjusted
Amount, makes four color ink Color uniformities and chromatic value meet newspaper printing requirement, is made on paper by gradually decreasing fountain solution output quantity
Margin part, the especially edge of control strip just starts dirty trace occur, and record starts the fountain solution for occurring before dirty trace
Output quantity setting value F1, the F that is recorded1Represent the condition for normally printing ink layer thickness close to blank but ink roller holding in the space of a whole page
Under, to resist optimum dampener liquid dosage required for space of a whole page scumming.It indicates are as follows:
F in formula (1)1Fountain solution supply when printing No.1 beta version is represented, E represents a print cycle and evaporated
Wetting liquid measure, fwRepresent the wetting liquid measure that the blank position of unit area coverage rate is shifted, foRepresent unit area coverage rate
The wetting liquid measure that is shifted of picture and text position, t1For the picture and text area coverage of No.1 beta version.Since control strip is on the space of a whole page
Shared area very little, i.e. t1Very little, the fountain solution supplied mainly are consumed in evaporation and are coated on space of a whole page blank position and turn again
It moves on on paper, is absorbed by paper, so having:
F1≈E+fw (2)
The four color ink Color uniformities and chromatic value meet newspaper printing requirement and refer to the blueness of each ink-covered area, product on control strip
The chromaticity distortion of red, yellow, black four colors can use in the error range that newspaper printing allows such as xrite-528 spectrophotometric
Meter fixed point is detected the chromatic value of each color lump on control strip or is detected using such as IntelliTrax automatic scanning system.
Step (3) is installed on journalism rotary press.Since the most important consumption ways of printing process fountain solution are creams
Change be then transferred on paper in ink, therefore picture and text area coverage it is bigger ink-covered area consumption fountain solution it is also more, need to mention
The wetting liquid measure of confession is also bigger.It is different that the inking device of offset press can control output according to different ink-covered area picture and text area coverages
Ink amount, and damping device according to ink-covered area realization zonal control function, when each ink-covered area picture and text area coverage difference, most
Excellent fountain solution supply is exactly the fountain solution supply when picture and text area coverage maximum ink-covered area is close but set-off does not occur.Print
When brushing No. two beta versions, by adjusting four-color machine group output ink quantity, four color ink Color uniformities and chromatic value is made to meet newspaper printing
It is required that making the side of margin part on paper, especially large area color lump on the spot by gradually decreasing fountain solution output quantity
Edge just starts dirty trace occur, and record starts the fountain solution output quantity F for occurring before dirty trace2, the F that is recorded2It represents and is tested with No. two
The image coverage of version under conditions of keeping normal printing ink layer thickness, is used to resist optimum dampener liquid required for space of a whole page scumming
Amount.It indicates are as follows:
F2=E+fw·(1-t2)+fo·t2 (3)
F in formula (3)2Fountain solution supply when representing No. two beta versions of printing, t2It represents and contains large area on No. two beta versions
The picture and text area coverage of the ink-covered area of color lump, such as Fig. 2 cyan version, the picture and text area of each ink-covered area of the middle line right side marked as 11 to 20
Coverage rate.It is available by converting according to formula (1) and formula (2):
Due to t2And t1Difference be equal to large area on the spot in ink-covered area where color lump, this on the spot color lump with respect to plate cylinder
The height of picture and text area coverage, the color lump on the spot is designed to the 40% of cylinder circumference, so t2And t1Difference be 40%,
Have:
Step (4) is directed at the axial centerline of printing machine with the width direction middle line of the digital document of the living-article to be printed of reading,
As unit of the width of one ink-covered area of printing machine, subregion is carried out to digital document, calculates the picture and text area coverage of each subregion, then
The maximum ink-covered area of picture and text area coverage is found out, the picture and text area coverage of note picture and text area coverage maximum ink-covered area is TSmax。
Step (5), multiplied by the perimeter of plate cylinder, is obtained the area of an ink-covered area, is denoted as S with the width of an ink-covered area.
Step (6) is with the picture and text area coverage of picture and text area coverage maximum ink-covered area described in step (3) divided by step (4) institute
The area for the ink-covered area stated obtains the picture and text coverage rate of picture and text area coverage maximum ink-covered area, is denoted as t, has:
Since each ink-covered area picture and text coverage rate of living-article to be printed is different, optimum dampener liquid supply should be according to picture and text area coverage
Maximum ink-covered area determines, has:
Wherein F indicates the optimum dampener liquid dosage when picture and text coverage rate of picture and text area coverage maximum ink-covered area is t.Convolution
(2) and formula (5), the preset value of the fountain solution output quantity of living-article to be printed is determined are as follows:
Claims (2)
1. a kind of method of determining newspaper printing fountain solution preset value, it is characterised in that: by printing two sets of special design and printings
Test chart obtains data and establishes the relationship between optimum dampener liquid supply and space of a whole page picture and text area coverage, in newspaper printing
In production, the digital document of printing living-article is read, the picture and text area coverage of each ink-covered area is calculated, according to relationship letter has been established
Number, quantitatively determines fountain solution preset value；
Wherein two sets of special design and printing test charts include No.1 test chart and No. two test charts；
Wherein No.1 test chart, only containing as unit of an ink-covered area width by printing machine, each ink-covered area includes green, product
The control strip of red, yellow, black four colors color lump on the spot, the length of control strip are the integral multiple of ink-covered area width, and length is at least wider than paper
It spends containing most ink-covered area numbers under small 2 centimetres of requirement, control strip is placed centrally along space of a whole page width direction in the seaming portion of the space of a whole page
Position；No. two test charts also include other than including control strip identical with first set and being set to identical position
Having width is the 50% of control strip width, is highly 40% black, green, pinkish red of plate cylinder perimeter, Huang Sise color lump on the spot,
On the basis of the middle line of space of a whole page width direction, yellow block is above left side, and pinkish red color lump is below left side, and black block is on right side
Side, cyan block keep the blank of 1 centimetre of spacing in lower right-hand side between yellow block and pinkish red color lump, black block and cyan block it
Between keep the blank of 1 centimetre of spacing, pinkish red color lump and cyan block keep the blank of 1 millimeter of spacing between control strip respectively.
2. a kind of method of determining newspaper printing fountain solution preset value according to claim 1, it is characterised in that: journalism
The calculation method of rotary press fountain solution preset value, specifically includes the following steps:
No.1 test chart described in step (1) and No. two test charts make No.1 test printing plate and No. two test printing plates respectively；
No.1 described in step (2) installation steps (1) is tested on printing plate to journalism rotary offset machine, and four-color machine group output ink is adjusted
Amount and wetting liquid measure, make four color ink Color uniformities and chromatic value meet newspaper printing requirement, and edge is close on the spot but does not have
There is set-off, records the fountain solution output quantity F of current each unit1；
No. two test printing plates described in step (3) installation steps (1) adjust four-color machine group output ink quantity and wetting liquid measure, make four
Color ink Color uniformity and chromatic value require to meet the requirement of newspaper printing described in step (2), and control strip edge is close but does not have
Set-off is occurred, the fountain solution output quantity F of current each unit is recorded2；
Step (4) reads in the digital document of living-article to be printed, with the axis of the space of a whole page width direction middle line alignment printing machine of digital document
To the midline, as unit of an ink-covered area width of printing machine, subregion is carried out to digital document, calculates the picture and text covering of each subregion
Area, then the maximum ink-covered area of picture and text area coverage is found out, the picture and text area coverage of note picture and text area coverage maximum ink-covered area is TSmax；
Step (5), multiplied by the perimeter of plate cylinder, is obtained the area of an ink-covered area, is denoted as S with the width of an ink-covered area；
Step (6) is with the picture and text area coverage TS of picture and text area coverage maximum ink-covered area described in step (4)maxDivided by step (5) institute
The area S for the ink-covered area stated obtains the picture and text coverage rate of picture and text area coverage maximum ink-covered area, is denoted as t, determines step (4) institute
The fountain solution preset value F for the living-article to be printed stated are as follows:
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| CN201710053725.0A CN106891627B (en) | 2017-01-22 | 2017-01-22 | A kind of method of determining newspaper printing fountain solution preset value |
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| CN201710053725.0A CN106891627B (en) | 2017-01-22 | 2017-01-22 | A kind of method of determining newspaper printing fountain solution preset value |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69820386T2 (en) * | 1997-10-22 | 2004-09-16 | Baldwin-Japan Ltd. | Method and device for supplying dampening water |
| DE10058550A1 (en) * | 2000-11-24 | 2002-05-29 | Heidelberger Druckmasch Ag | Process for controlling the ink-to-fountain solution balance in a rotary offset printing press |
| CN201530163U (en) * | 2009-07-23 | 2010-07-21 | 深圳华新彩印制版有限公司 | Printing machine and damping system, damping liquid adding apparatus, and damping additive suction means |
| CN103465657B (en) * | 2013-09-02 | 2015-11-18 | 中国印刷科学技术研究所 | Difference is undertaken the printing of the Forecasting Methodology of material print color characteristic |
| CN103714245B (en) * | 2013-12-19 | 2016-09-28 | 杭州电子科技大学 | A kind of method obtaining the optimal field density of halftone paper printing |
| CN104742516B (en) * | 2015-03-12 | 2017-01-25 | 周广伟 | High-power image dot coverage rate digital measuring method suitable for whole printing process |
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Effective date of registration: 20210928 Address after: 410300 No. 203, Dayao Qiangsheng village, Liuyang City, Changsha City, Hunan Province Patentee after: Liuyang Zhongliang Color Printing Co.,Ltd. Address before: 510530 1923, building 3, Ruifeng center, Kaichuang Avenue, Huangpu District, Guangzhou City, Guangdong Province Patentee before: Guangzhou bud rice Intellectual Property Service Co.,Ltd. |
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