CN102568020B - Overprint plate making method - Google Patents
Overprint plate making method Download PDFInfo
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- CN102568020B CN102568020B CN201210007099.9A CN201210007099A CN102568020B CN 102568020 B CN102568020 B CN 102568020B CN 201210007099 A CN201210007099 A CN 201210007099A CN 102568020 B CN102568020 B CN 102568020B
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Abstract
The invention discloses an overprint plate making method, which is characterized by comprising the following steps of: (1) laying out a page; (2) performing color separation; (3) trapping an image; (4) rasterizing the image; and (5) making up. During the trapping of the image in the step (3), the number of lattice point layers of a dark color image and a light color image to be overprinted is changed, and then overprint is performed at an overprint region of the light color image to an overprint region of the dark color image, so that the tone of an overprint image is obviously reduced, the contrast with the dark color image and the light color image before overprint is relieved, the defects of overlaying mark of two-color overprint and accuracy error of a printing machine are overcome, and according to the technical improvement, not only is the product quality guaranteed, but also good economic benefit stands out, the plate printing and printing frequency are saved, and the product quality and the yield are improved.
Description
Technical field
The present invention relates to a kind of printing process, relate in particular to a kind of overprint plate making method.
Background technology
The printing of high-grade packing box is generally to add spot color printing on the basis of C, M, Y, K four-color process, very accurate to the cover alignment request between forme of all kinds in printing process, because register trouble meeting causes appearing of printable fabric background color between two negatives, the 3rd look double line that visually can produce a tiny white line (leaking white) or a dichromatism double exposure, these flaws can have a strong impact on the outward appearance of printing.But in actual production process, due to factors that Act for God such as mechanical system errors and printable fabric distortion, may not realize the absolute alignment between forme, in order to address this problem, different image processing softwares and manufacturer of software for composing have all proposed some solutions, are substantially all to carry out design software according to the principle of trapping or double exposure.Trapping principle: be generally to expand lower look not expand colouring, expand light color and do not expand dark color, expand plain net in addition and do not expand the meaning on the spot.Sometimes also can expand mutually, special circumstances are next will carry out reverse trap, even also will between two adjacent looks, add space and make up overprint error, so that printed matter is attractive in appearance.The size of trapping amount will be determined according to the chromatography precision of the characteristic of printable fabric and print system.The trapping amount of general offset printing is smaller, and the trapping amount of gravure and flexo is larger, generally at 0.2-0.3mm, can to printing precision, require to determine according to client.The method of trapping mainly contains: (1) monochromatic line fall-on style: on color lump limit, add light lines, and elect lines attribute as double exposure.(2) synthetic collimation method: add synthetic thread on color lump limit. lines attribute is not elected double exposure as.(3) top and bottom process: on different layers by element being inside contracted or extends out to realize trapping.(4) displacement method: realize and inside contract or extend out by the position of flex point in mobile color lump, be generally used in the trapping relevant with gradual change.Existing each image processing software mainly solves this problem by top and bottom process and displacement method, but after these image processing software trappings, also there will be some problems can not meet the high-quality requirement of printing, as: 1) AdobePhotoshop completes the trapping of image by the trap width of CMYK pattern hypograph is set, the width of trapping is only set, image just can only carry out trapping by expanding color, when this will cause color lump and color lump trapping there is disconnected product and sawtooth in outline line border, affects the quality of printing.2) Adobe Illustrator software is mainly by the width of area of trap is set, the ratio value of vertical trap and horizontal trapping and light tone reduction ratio etc., with respect to Photoshop, its trapping effect has been got well a lot, but its deficiency is to not implementing automatic trapping between the pattern of filling pattern and stroke, gradual change, continuous toned image and other characteristic.3) connect the automatic trapping that the higher CorelDraw of domestic packages printing factory's utilization rate can not realize continuous toned image and import image.Above-mentioned each image processing software also just laminated by simple figure and or the mode that reduces of light tone, not basic superimposed images and the deep mixed problem causing of original image of solving.The packing trapping software of specialty as: the Deskpack of PackEdge, Artpro, Esko-Graphics company, upright Packsharp, the Trapwise of the QM DI46-4 of Heidelberg and Ke Liao issue etc. need independently software systems to use, this just requires user must buy software simultaneously and trapping module just can be used trapping module wherein, this has increased user's financial burden undoubtedly greatly, for printing front publishing work personnel, is provided with threshold one.Lose lustre overprint plate making method and printer's artistic skill of this increasing net makes up preferably error that register trouble brings, improves printing printing quality and the percentage of A-class goods.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of overprint plate making method, the mass defect that this overprint plate making method can avoid register trouble to bring, quality and the qualification rate of raising product.The technical scheme adopting is as follows:
, it is characterized in that comprising the steps:
(1) page layout: the figure designing, image and word are imported in software for composing, and layout becomes the single page;
This step mainly completes editor and the relation between graph image and word of the inserting of graph image, word and processes.Compare with general printed matter, the printing quality of cigarette-brand requires much higher, two standards that must realize image and word just can reach client's satisfaction, therefore preferably adopt Freehand software for composing to carry out typesetting, Freehand software for composing compares with CorelDRAW with other two Illustrator of main flow software for composing, FreeHand has larger advantage in cigarette-brand printing: volume is little, and travelling speed is faster, meets the large demand of cigarette-brand typesetting workload; Word processing function can match in excellence or beauty with professional word processor, meets what designer's of printing work requirement; Be a real vector software, especially to accurate adjustment figure, free originality graphing capability is powerful, is widely used.
(2) color separation: the page after layout carries out Color Separation in color separation software, determines and to copy contrast scope and grey balance curve, adjust level curve correction of color, determines black print, removes background color and under color addition;
(3) trapping of image: first, determine double exposure position, will need dark-colored image and the light-colored image of double exposure to be placed on respectively in two figure layers, the upper strata of light-colored image in dark-colored image and the region overlaid that both need double exposure; Secondly, the site of reducing the double exposure region of dark-colored image becomes number, and the site that simultaneously increases the double exposure region of light-colored image becomes number; Finally, double exposure is carried out to the double exposure region of dark-colored image in the double exposure region of light-colored image;
In this step, for obtaining good double exposure effect, double exposure is carried out to the double exposure region of dark-colored image in the double exposure region of above-mentioned light-colored image, need be through repetition test repeatedly, be the size of adjusting double exposure region, and the site of adjusting dark-colored image and light-colored image becomes the change value of number, until reach best double exposure effect.
(4) image rasterization is processed: adopt the fm screening mode of square site that the word on the page after color separation, figure and image rasterization are generated to halftone dot image, and control imaging system page info is recorded on plate, by the chromatic number of printing, export respectively color separation forme;
Preferred RIP(raster image processor in this step) carry out processing page, spell again the RIP mode of large version, can simplify the alter mode of final act, if in the end find that the page has typo during outgoing inspection, only need after having revised mistake, this page again RIP be processed once, replace inherited error part, than whole large version again RIP is saved trouble.This kind of RIP processing mode is relatively suitable for packing, labels class printing.
(5) layout: import in layout software completing the PS of typesetting or the Single document of PDF, in every 4～28 unit file group to versions, and automatically generate version mark, cross curve, forme control strip and asterisk etc. in every version.
In this step, the Preps layout software of preferred former Ke Liao (Creo) company.Preps software engineering content is high, and compatible performance is strong, can be applicable to the printing demand of different class.Preps layout software tool has the following advantages: can use the page that RIP crosses directly to spell large version, be suitable for the large version operation of spelling of packed file; Can allow user to use different file type, page size and directions with, and cut mark and the cross curve that carry out respectively the various pages set, can also on a platform paper, put into different printed documents simultaneously; Support pdf document layout completely, and support built-in RIP trapping information, improve the integration of JDF simultaneously; Ke Liao provides the commodity production flow process of a whole set of Chinese version, can prompt workflow to exporting the seal of controlling from Preps layout software.
The trapping of above-mentioned steps (2) color separation and step (3) image, in actual production process, does not have dividing of strict priority, and preferably color separation was carried out before the trapping of image.
As preferred version of the present invention, it is characterized in that: in described step (2), it is 0～15% that the site in the double exposure region of dark-colored image becomes the minimizing amplitude of number.
As preferred version of the present invention, it is characterized in that: in described step (2), it is 0～10% that the site in the double exposure region of light-colored image becomes the increasing degree of number.
By change, need the dark-colored image of double exposure, the site of light-colored image becomes number, and then carry out double exposure, significantly weakened the depth of shade of double exposure image, alleviated with double exposure before the contrast of dark-colored image, light-colored image, the defect that laminates trace and printing machine trueness error that has overcome two look chromatographys, the improvement of its technology is not only protected in product quality, has more given prominence to good economic benefit, save forme, print pass, improved product quality and yield rate.
Accompanying drawing explanation
Accompanying drawing is the process flow diagram of the preferred embodiment for the present invention.
Embodiment
Below in conjunction with accompanying drawing and the preferred embodiment of the present invention, be described further.
As shown in drawings, this overprint plate making method comprises the steps:
Step (1) page layout: complete inserting and the editor of the word such as Smoking is harmful to your health of bar code figure, image in FreeHand software for composing, form the single page;
Step (2) color separation: completing the color separation of image in color separation software, is respectively eight process colors such as white, black, cyan, magenta, yellow, special background color, dark-brown and light brown;
The trapping of step (3) image: dark-brown and light brown are increased to the trapping processing that net is lost lustre, light brown image is placed on the figure layer above dark-brown image, the double exposure of light brown image and dark-brown image is of a size of 0.15 ㎜, the site in the double exposure region of dark-brown image becomes number to reduce 12%, and the site in the double exposure region of light brown image becomes number to increase by 8%, double exposure is carried out to the double exposure region of dark-brown image in double exposure region by light brown image, and trapping effect is now best;
Step (4) image rasterization is processed: employing be square fm screening mode, obtain respectively eight look halftone dot images, carrying out layout subsequently;
Step (5) layout: 15 single page files are spelled in a space of a whole page that is applicable to printing.
In other embodiment of the present invention, in step (3), the site in dark-brown double exposure region becomes number not reduce, and the site in the double exposure region of light brown becomes number not increase.
In other embodiment of the present invention, in step (3), the site in dark-brown double exposure region becomes number to reduce 15%, and the site in the double exposure region of light brown becomes number to increase by 10%.
Claims (3)
1. an overprint plate making method, is characterized in that comprising the steps:
(1) page layout: the figure designing, image and word are imported in software for composing, and layout becomes the single page;
(2) color separation: the page after layout carries out Color Separation in color separation software, determines and to copy contrast scope and grey balance curve, adjust level curve correction of color, determines black print, removes background color and under color addition;
(3) trapping of image: first, determine double exposure position, will need dark-colored image and the light-colored image of double exposure to be placed on respectively in two figure layers, the upper strata of light-colored image in dark-colored image and the region overlaid that both need double exposure; Secondly, the site of reducing the double exposure region of dark-colored image becomes number, and the site that simultaneously increases the double exposure region of light-colored image becomes number; Finally, double exposure is carried out to the double exposure region of dark-colored image in the double exposure region of light-colored image;
(4) image rasterization is processed: adopt the fm screening mode of square site that the word on the page after color separation, figure and image rasterization are generated to halftone dot image, and control imaging system page info is recorded on plate, by the chromatic number of printing, export respectively color separation forme;
(5) layout: import in layout software completing the PS of typesetting or the Single document of PDF, in every 4～28 unit file group to versions, and automatically generate version mark, cross curve, forme control strip and asterisk in every version.
2. overprint plate making method as claimed in claim 1, is characterized in that: in described step (3), it is 0～15% that the site in the double exposure region of dark-colored image becomes the minimizing amplitude of number.
3. overprint plate making method as claimed in claim 1, is characterized in that: in described step (3), it is 0～10% that the site in the double exposure region of light-colored image becomes the increasing degree of number.
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| CN103909752A (en) * | 2013-11-15 | 2014-07-09 | 浙江汇诚通用印务有限公司 | Red date milk presentation box printing technology |
| CN106739592A (en) * | 2016-11-21 | 2017-05-31 | 武汉宝钢印铁有限公司 | A kind of metal UV color printing product color separation prints coating method |
| DE102018201669A1 (en) * | 2017-03-21 | 2018-09-27 | Heidelberger Druckmaschinen Ag | Method of preserving the blackening of objects |
| CN107832024A (en) * | 2017-11-09 | 2018-03-23 | 山形印刷(无锡)有限公司 | A kind of printing process for preventing printed data mistake and print system |
| CN108725005A (en) * | 2018-05-25 | 2018-11-02 | 溧阳市鑫宇印刷有限公司 | A kind of anti-copy extraordinary method for platemaking |
| EP4035898A4 (en) | 2019-10-10 | 2023-09-27 | Toyo Seikan Co., Ltd. | Platemaking method, platemaking system, and can body |
| CN111391474B (en) * | 2020-02-26 | 2021-11-12 | 清远市简一陶瓷有限公司 | Silk screen suitable for all layouts in marble tile and manufacturing method thereof |
| CN111890781B (en) * | 2020-08-26 | 2021-10-26 | 苏州创亚材料科技有限公司 | Printing plate manufacturing process |
| CN113172986B (en) * | 2021-03-26 | 2022-12-06 | 阿里巴巴（中国）有限公司 | Network layout generation method, production system, image processing method and device |
| CN115556492B (en) * | 2022-10-09 | 2024-09-17 | 陕西金叶印务有限公司 | Technological method for improving offset printing |
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| CN1054034A (en) * | 1990-02-16 | 1991-08-28 | 北京工业大学特种颜料厂 | Fabric trichromatic printing form and aspect method of testing and gauge |
| US7542688B2 (en) * | 2004-11-24 | 2009-06-02 | Xerox Corporation | Method of detecting pages subject to reload artifact with IOI (image on image) correction |
| CN101033587B (en) * | 2007-04-24 | 2010-04-07 | 西安三五一一毛巾厂 | Method of printing on towel by four primary colors |
| CN101320204A (en) * | 2008-05-13 | 2008-12-10 | 常德金鹏印务有限公司 | Composite paper color control method |
| CN101610343B (en) * | 2008-06-16 | 2011-05-11 | 北京大学 | Method and system for automatic trapping |
| DE102010036249A1 (en) * | 2009-10-01 | 2011-04-07 | Heidelberger Druckmaschinen Ag | Method and device for determining register deviations by means of recursion analysis |
| JP5604761B2 (en) * | 2009-11-11 | 2014-10-15 | 健治 吉田 | Print medium, information processing method, information processing apparatus |
| CN101853516B (en) * | 2010-04-15 | 2012-02-08 | 镇江科大船苑计算机网络工程有限公司 | Color separation and makeup method of sign printing |
| CN102285260B (en) * | 2011-07-15 | 2015-03-04 | 孟祥祯 | Anti-counterfeiting silk-screen printed image-word works and printing method |
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