CN101259783B - Method for controlling ink quantity of printed matter deinking sample - Google Patents
Method for controlling ink quantity of printed matter deinking sample Download PDFInfo
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- CN101259783B CN101259783B CN2008100152600A CN200810015260A CN101259783B CN 101259783 B CN101259783 B CN 101259783B CN 2008100152600 A CN2008100152600 A CN 2008100152600A CN 200810015260 A CN200810015260 A CN 200810015260A CN 101259783 B CN101259783 B CN 101259783B
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Abstract
The invention relates to a method for controlling ink supply on deinking samples of printing matters, which belongs to the technical field of the printing. The method includes the following steps that: 1) the target value of field density in an ink area of the printing matters is determined; 2) a printability tester, a color-coating wheel or a coating rod is used for printing on the paper to determine the coverage of the ink on the paper; after the printing matters are dry, the field density in the ink area of the printing matters is measured by using a reflective densimeter or a light splitting photometer and the field density value can meet the requirement for target value of the filed density in the ink area of the printing matters by adjusting the printing ink supply; 3) target vales of the ink coverage of the printing matters are determined and the ink coverage of the printing matters is measured by adopting an image analysis software; 4) the number of the deinking samples in each group is determined according to the paper specification and the measurement results for each group of the samples are calculated, compared and adjusted so that the ink coverage of each group of sample can comply with the target values. The method for controlling the ink supply is used for precisely controlling the ink supply on the deinking samples of the diversified printing matters and has wide application range and high reliability.
Description
Technical field
The present invention relates to a kind of method that is used to control ink quantity of printed matter deinking sample, belong to printing technology.
Background technology
For a long time, aspect the recycling of waste paper, lack between ink manufacturer and the paper mill and link up, ink manufacturer is paid attention to the printability and the environmental-protecting performance of printing ink, and the paper mill is paid close attention to is the deinking performance of waste paper when recycling, make printing ink satisfy the requirement in ink manufacturer and paper mill simultaneously, tackle the deinking performance of printing ink newly developed and study.
Deinking experiment is at present mainly carried out at certain class printed matter, does not relate to printing process, and development of new printing ink need be printed on the printing ink of preparation on the paper earlier when testing its deinking performance on a small scale, carries out the deinking experiment again after storing a period of time.If the printing process that relates in the experiment carries out on printing machine, the printing experimental period long, cost is high, simpler and more direct way is the printing experimental facilities that utilizes in the laboratory, print experiment as equipment such as color development wheel, spreading rod, printability instrument, use a spot of printing ink and paper can finish experiment.
When contrasting the deinking performance of dissimilar, different formulations printing ink, key issue is that control is printed onto the quantity of ink unanimity on the unit are paper, and when having only quantity of ink on the different printing product unit are consistent, their deinking is tested just the contrast meaning.
Calculate the quantity of ink on the printed matter, traditional method is used weight method more, shifts the weight of front and back forme or paper as adopting weighing printing ink, obtains the transfer China ink amount in the offset lithography, thereby calculates ratio of printing ink transfer.This method is subjected to more restriction, should measure under the constant temperature and humidity condition to guarantee certainty of measurement as paper.This method is unsuitable for contrasting dissimilar printing ink, the printed matter of dissimilar printing ink, even the ink quality of transferring on the paper is identical, the image effect that dry back China ink layer is expressed may have than big difference, and main cause is that the reflection density of China ink layer is not necessarily identical.
Summary of the invention
The present invention adopts the quantity of ink on the field density of printed matter and method that graphical analysis the combines control printed matter, field density is used to control the effective thickness of China ink layer, graphical analysis is used to measure the coverage rate of printing ink, the two is in conjunction with the quantity of ink that can control on the printed matter, make the deinking sample of preparation have identical quantity of ink, be convenient to contrast deinking performance.
The present invention adopts instruments such as printability instrument, color development wheel or spreading rod to print on stock but not at press printing, printed matter is used to estimate the deinking performance of printing ink.
During the quantity of ink of the present invention on estimating printed matter,, when the different printing product are consistent respectively, can think that quantity of ink is identical aspect these two based on effective thickness and two aspects of ink coverage of China ink layer after the drying; The effective thickness of China ink layer adopts the ink-covered area field density to represent.
A kind of method that is used to control ink quantity of printed matter deinking sample, method is as follows:
1) determines the desired value of printed matter ink-covered area field density;
2) utilize printability instrument, color development wheel or spreading rod on paper, to print on the spot, determine the coverage rate of printing ink on paper, after the printed matter drying, adopt the field density of reflection type density meter or spectrophotometer measurement printed matter ink-covered area, make the field density value satisfy the desired value of printed matter ink-covered area field density by adjusting printing ink quantity;
3) determine the desired value of printed matter ink coverage, adopt image analysis software to measure the ink coverage of printed matter, concrete measuring process is as follows:
(1) scanning printed sheet, memory image is stored as the BMP format-pattern;
(2) start software for calculation;
(3) read the specimen page image;
(4) image is evenly divided into horizontal W, vertical H zone, promptly capable, the every capable W of H regional, the value of W and H should make image all reach more than the 150lpi to resolution ratio in length and breadth;
(5) make initial number of ink dots n=0, judge one by one whether each zone has ink dot;
Since the 1st zone of the 1st row, ink dot is arranged, then n=n+1 earlier; Do not have, then n is constant; Judge the 2nd zone of the 1st row again, the 3rd zone of the 1st row ..., until W zone of the 1st row;
Next, judge the 2nd each zone of row, the 3rd row ..., capable to H; The n value that obtains at last is the sum that the zone of ink dot is arranged;
(6) calculate ink coverage: gamma=n/ (W*H), turn to the percentage form;
(7) result of calculation shows;
(8) wait for calculating next time;
4) determine the quantity of every group of deinking sample according to the specification of paper, the measurement result of every group of sample is calculated, relatively, making the ink coverage of every group of sample satisfy the desired value requirement through adjusting.
Image analysis software adopts Visual Basic 6.0 language,
Can move under the environment.
When image analysis method is measured the coverage rate of printing ink, printing shape on the spot there is not strict requirement, need only the China ink layer evenly, even the edge of printing zone and end are not neat or the interrupted situation of trace occurs, image analytical method also can accurately calculate the coverage rate of printing ink in the unit are.
For the printing ink of same type, same form and aspect, ink film thickness and field density have corresponding relation; For the printing ink of dissimilar identical form and aspect, when field density is identical, express same printing effect, can think that effective ink film thickness is identical, when measuring the field density of China ink layer, printed matter does not need constant temperature and humidity to handle, process is simple, precision is high, is better than weight method generally.
Adopt printability instrument, color development wheel or spreading rod to prepare printed sample, the field density of reflection type density meter or spectrophotometer measurement printed matter is adopted in dry back, and for the printing ink of different form and aspect, field density is controlled at scope as shown in table 1:
The field density scope of the different form and aspect printing ink of table 1
| The printing ink form and aspect | The printed matter field density |
| Huang Mo | 0.90-1.2 |
| Magenta ink | 1.15-1.55 |
| Blue or green China ink | 1.25-1.6 |
| Tusche | 1.30-1.80 |
3. beneficial effect of the present invention
For the reliability of quantity of ink on checking field density method and the image analytical method control printed matter, carried out following experiment, but be not limited to following example.
Utilize the color development wheel that rotary ink is imprinted on the newsprint, paper is cut into the A4 size, adjusts the China ink amount that goes up of printing ink, and making the dried density of printed matter is 1.4 ± 0.05, and the target coverage rate of printing ink is 30%.Paper behind the seal utilizes the scanner scanning imaging, utilize the software analysis image again, obtain the ink coverage of printed matter, with 15 printed matters is one group, after the printed matter scanning, average, if ink coverage and desired value have deviation, add not printed news paper or field printing product and be adjusted to desired value, prepare 4 groups of deinking samples altogether.
With the paper after the printing, adopt conventional alkaline process flotation/washing deinking, pulping in high-concentration pulper is poured the slurry behind the size degradation in floatation and ink removing instrument flotation certain hour then earlier, the slurry after the flotation dilute after 80 purpose copper mesh washing concentrating once.Slurry after the washing is copied sheet on square handshcet former, utilize the electrothermal drying cylinder oven dry, behind the equilibrium water conten, utilizes whiteness instrument and residual ink instrument to estimate the deinking situation.
The deinking result of 4 groups of deinking samples is as shown in table 2.
The deinking efficiency of table 2 different printing sample
| Project | No. 1 sample | No. 2 samples | No. 3 samples | No. 4 samples | Mean value | Maximum deviation % |
| Whiteness/%ISO | 49.8 | 50.0 | 49.7 | 49.9 | 49.85 | 0.3 |
| Residual ink area/% | 1.952 | 1.954 | 1.950 | 1.949 | 1.952 | 0.29 |
| An ink particle number/cm -2 | 655 | 648 | 650 | 645 | 649.25 | 0.89 |
As can be seen from Table 2, after 4 sample deinkings, the maximum deviation of residual ink area and two important evaluating index of whiteness is no more than 0.3%, and the ink particle number does not surpass 0.9% yet.Can think that deinking efficient is suitable, the repeatability of experiment better.
For enlarging the checking scope, adopt different printing ink, printing equipment and printing paper, according to the quantity of ink on the method control printed matter of the present invention, 4 identical deinking samples of China ink amount of every kind of situation preparation, de-inking method is identical with said method, and experimental result is as shown in table 3.
The deinking efficiency of the dissimilar printing ink effect of table 3 printed sample
As can be seen from Table 3, experiment relates to lithographic plate, intaglio plate, flexographic plate and silk screen printing ink with printing ink, 4 printed matter samples of every kind of printing ink preparation, and the China ink amount on the control deinking sample is identical.After the printed matter deinking, the maximum deviation of residual ink area and two evaluation indexes of whiteness is no more than 0.3%, and the ink particle number does not surpass 0.8% yet.Can think that deinking efficient is suitable, the repeatability of experiment better illustrates that utilizing the optical density (OD) method to combine with image analytical method can accurately control the quantity of ink of printing sheets, and range of application is wider.
Description of drawings
Fig. 1 is a software flow pattern of measuring ink coverage among the present invention.
The specific embodiment
In conjunction with the embodiments, the invention will be further described, but be not limited thereto.
Embodiment 1
(Shandong China safe paper industry group) is cut into the A4 size with newsprint, utilize electronic balance to take by weighing rotary ink (Taiyuan Ink Factory of metering, tusche), evenly be applied on the color development wheel (Printing Tech Research Office, Shanghai), on newsprint, be printed as on the spot, utilize reflection type density meter (X-Rite 518) to measure field density after the drying, adjust the China ink amount that goes up of color development wheel, making dry density on the spot is 1.4 ± 0.05, the China ink amount that goes up of record color development wheel.
Adopt above-mentioned going up on the newsprint of China ink amount after cutting evenly to print 30% area, print many.Dried printed matter utilizes scanner (complete friendly scanner, SM8700) scanning imagery, utilize the software analysis image again, obtain the ink coverage of every printed matter, with 15 printed matters is one group, calculates the mean value of ink coverage, if ink coverage and desired value have deviation, add not printed news paper or field printing product and be adjusted to desired value (30%), obtain deinking sample A.
Change above-mentioned rotary ink into gentle version water color ink (Shenzhen Bu Ruite Industrial Co., Ltd., black), other operating process are the same, obtain deinking sample B; Printing ink is changed into aqueous photo-curing printing ink (laboratory self-control, black), operating process is basic identical again, and just printed matter adopts UV to solidify machine (Baoding melt reach Electron equipment Co., Ltd, range 15cm, light intensity 80W/cm) drying, obtains deinking sample C.Sample A, B have identical field density and ink coverage with C, and their quantity of ink on the printed matter unit are are identical, can carry out the deinking contrast experiment.
Embodiment 2
With art paper (Shandong Taiyang Paper Industry Co., Ltd., 120g/m
2) according to printability instrument (Dutch IGT, GST2) requirement is cut into the paper slip of certain specification, with a certain amount of offset ink (day lion board, TRT-423, the blue or green China ink of offset resin) utilize the rider roller of printability instrument to handle after, transfer on the disc, select certain pressure, utilize the printability instrument to transfer on the art paper, after the drying, the test field density.Adjust the China ink amount that goes up of rider roller, the field density that makes dry printed matter is 1.55 ± 0.05, the China ink amount that goes up of record rider roller this moment.
Adopt the above-mentioned China ink amount that goes up on the printability instrument, to print many.Dried printed matter utilizes scanner (hewlett-packard scanner, ScanJet 4570C) scanning imagery, utilize the software analysis image again, obtain the ink coverage of every printed matter, with 30 printed matters is one group, calculates averaging of ink coverage, if ink coverage and desired value have deviation, add not printed news paper or field printing product and be adjusted to desired value (30%), obtain deinking sample A.
Substitute offset ink (Hanghua Ink Chemical Co., Ltd., UV161, blue or green China ink) with UV printing ink, repeat said process, printed matter drying mode difference adopts UV to solidify the machine drying, obtains deinking sample B.
It is identical that sample A and B have their quantity of ink on the unit are printed matter of identical field density and ink coverage, can carry out the deinking contrast experiment of dissimilar ink printing product.
Claims (2)
1. method that is used to control ink quantity of printed matter deinking sample is characterized in that method is as follows:
1) determines the desired value of printed matter ink-covered area field density;
2) utilize printability instrument, color development wheel or spreading rod on paper, to print on the spot, determine the coverage rate of printing ink on paper, after the printed matter drying, adopt the field density of reflection type density meter or spectrophotometer measurement printed matter ink-covered area, make the field density value satisfy the desired value of printed matter ink-covered area field density by adjusting printing ink quantity;
3) determine the desired value of printed matter ink coverage, adopt image analysis software to measure the ink coverage of printed matter, concrete measuring process is as follows:
(1) scanning printed sheet, memory image is stored as the BMP format-pattern;
(2) start software for calculation;
(3) read the specimen page image;
(4) image is evenly divided into horizontal W, vertical H zone, promptly capable, the every capable W of H regional, the value of W and H should make image all reach more than the 150lpi to resolution ratio in length and breadth;
(5) make initial number of ink dots n=0, judge one by one whether each zone has ink dot;
Since the 1st zone of the 1st row, ink dot is arranged, then n=n+1 earlier; Do not have, then n is constant; Judge the 2nd zone of the 1st row again, the 3rd zone of the 1st row ..., until W zone of the 1st row;
Next, judge the 2nd each zone of row, the 3rd row ..., capable to H; The n value that obtains at last is the sum that the zone of ink dot is arranged;
(6) calculate ink coverage: gamma=n/ (W*H), turn to the percentage form;
(7) result of calculation shows;
(8) wait for calculating next time;
4) determine the quantity of every group of deinking sample according to the specification of paper, the measurement result of every group of sample is calculated, relatively, making the ink coverage of every group of sample satisfy the desired value requirement through adjusting.
2. a kind of method that is used to control ink quantity of printed matter deinking sample as claimed in claim 1 is characterized in that, the described image analysis software of step 3) adopts Visual Basic 6.0 language,
Can move under the environment.
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| CN2008100152600A CN101259783B (en) | 2008-04-17 | 2008-04-17 | Method for controlling ink quantity of printed matter deinking sample |
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| CN2008100152600A CN101259783B (en) | 2008-04-17 | 2008-04-17 | Method for controlling ink quantity of printed matter deinking sample |
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| CN101259783B true CN101259783B (en) | 2010-07-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9003972B2 (en) | 2010-01-07 | 2015-04-14 | Hewlett-Packard Development Company, L.P. | Reflection densitometer |
| CN102059851B (en) * | 2010-10-19 | 2012-12-26 | 杭州电子科技大学 | Method for determining use amount of spot color ink |
| CN102506703B (en) * | 2011-10-11 | 2014-02-12 | 中国烟草总公司郑州烟草研究院 | Method for determining stamping area ratio of tipping paper used for tobacco |
| CN104647891B (en) * | 2015-03-04 | 2017-06-06 | 莱鼎电子材料科技有限公司 | A kind of chip oxygen sensor prints drying production line equipment and its application method with full-automatic |
| CN106985512B (en) * | 2017-04-01 | 2019-03-01 | 北京奇良海德印刷股份有限公司 | A kind of ink control method and device of printed matter |
| CN114734728B (en) * | 2022-04-06 | 2023-08-01 | 中体彩印务技术有限公司 | Printing quality monitoring and adjusting method and system |
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| CN1772483A (en) * | 2004-11-12 | 2006-05-17 | 小森公司 | Ink supply amount adjustment method and apparatus for printing press |
| CN2885580Y (en) * | 2006-04-30 | 2007-04-04 | 洛阳圣瑞机电技术有限公司 | Printing product quality on-line monitor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1772483A (en) * | 2004-11-12 | 2006-05-17 | 小森公司 | Ink supply amount adjustment method and apparatus for printing press |
| CN2885580Y (en) * | 2006-04-30 | 2007-04-04 | 洛阳圣瑞机电技术有限公司 | Printing product quality on-line monitor |
Non-Patent Citations (1)
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| 李荣宗.印刷实地密度的测控和标定.<<工艺技术>>.1997,全文. * |
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Assignee: Xin Te decoration printing Co., Ltd of Wuhan City Assignor: Shandong Institute of Light Industry Contract record no.: 2012420000013 Denomination of invention: Method for controlling ink quantity of printed matter deinking sample Granted publication date: 20100721 License type: Exclusive License Open date: 20080910 Record date: 20120203 |
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Granted publication date: 20100721 Termination date: 20160417 |
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