CN109624534B - Multi-positioning method in registration printing - Google Patents
Multi-positioning method in registration printing Download PDFInfo
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- CN109624534B CN109624534B CN201811464523.6A CN201811464523A CN109624534B CN 109624534 B CN109624534 B CN 109624534B CN 201811464523 A CN201811464523 A CN 201811464523A CN 109624534 B CN109624534 B CN 109624534B
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- 239000000123 paper Substances 0.000 description 5
- 239000003086 colorant Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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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
- B41M1/14—Multicolour printing
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Abstract
The invention provides a multiple positioning method in register printing, numbering blocks to be printed on a printing plate before printing, scanning images of all color blocks after each printing process in a printing period to form a plurality of image plates, increasing the number of the color blocks in each plate according to a printing sequence, finally identifying the image plates with target color blocks by a system according to register relation, calculating error values between the target color blocks in the image plates and the register relation, and adjusting the execution amount of a register executing mechanism by the system according to the error values to realize accurate register printing. The invention can randomly arrange the positions of the color blocks according to the typesetting condition of the layout, and sets the cameras behind a plurality of printing processes for image scanning, thereby forming a plurality of image layouts, and the target overprinting execution quantity with the minimum error is selected to adjust the initial overprinting execution quantity by performing multiple comparison between the target execution quantity among the color blocks in the plurality of image layouts and the initial execution quantity of the system, thereby realizing full-automatic high-precision overprinting.
Description
Technical Field
The invention relates to the technical field of printing overprinting, in particular to a multiple positioning method in register printing.
Background
The web printing equipment is widely applied to the printing industry due to high speed, high efficiency and stable printing quality, the web also has unique personality, the web runs continuously without interruption in the middle, the positions of color groups are required to be aligned, otherwise, the colors and patterns are changed, the position relation between each color group is ensured by a mechanical gripper unlike the condition that a single sheet is not required to be in a mechanical jaw, the web printing cannot be stopped because of the continuity, about 200 meters of material is wasted before and after one stop, the position correspondence between the color groups is very critical, most overprinting systems in the industry are started by machines at present, an operator presses down from a first color gradual pressing roller at the forefront, then the colors are printed on a paper tape, the operator manually moves color blocks to be overprinted into a moving door, the operation from the first color block at the front to a color block at the back is required, after all color blocks are pulled in the door, because the hardware distance between two scanning heads of the prior web overprinting system is 20mm, therefore, overprinting can be started only by manually adjusting the distance between two color blocks to be overprinted to be about 20mm, otherwise, the equipment can not identify the color blocks, overprinting relation is started on the operation screen for overprinting, after the overprinting is finished, the speed of the machine is increased to start normal production, the mode is that the operation is carried out manually, the speed is low, the speed is fast and invisible, the printing effect is not good under the condition of low speed, and like the equipment with more color groups, the operator needs to run back and forth, even if an operator who is skilled in operation needs to adjust the length of at least 4-5 printing devices each time overprinting is started, overprinting work can be completed, and the mode not only causes high labor intensity of the operator, but also cannot realize accurate overprinting.
Disclosure of Invention
The invention aims to provide a multiple positioning method in register printing aiming at the prior technical situation, which carries out multiple comparison through a plurality of plate frames, selects the execution quantity with the minimum error for adjustment, and has more accurate register printing and high efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to a multiple positioning method in register printing, which is characterized in that blocks to be printed on a printing plate are numbered before printing, all color blocks after each printing process are subjected to image scanning in a printing period to form a plurality of image plate frames, the number of the color blocks in each plate frame is increased progressively according to a printing sequence, finally, the image plate frames with target color blocks are identified by a system according to register relation, error values between the target color blocks in the image plate frames and the register relation are calculated, and the system adjusts the execution amount of a register execution mechanism through the error values to realize accurate register printing.
In the above scheme, the overprint relationship is a relationship between an initial overprint execution amount and a target overprint execution amount, wherein the initial overprint execution amount needs to be input into the system before printing starts.
Further, the target overprint execution amount is determined by the difference in position between the target patch and the reference patch, i.e., the distance between the two patches in the longitudinal and lateral directions.
Further, the printing cycle is the printing cycle of each color block on the printing plate, and if the number of color blocks on the printing plate is M, one printing cycle forms M or M +1 printing plates according to the number of color blocks.
In each version of the first printing cycle, the system takes a first color block shared in each version as a reference color block, all target color blocks are compared with the reference color block to obtain a plurality of target overprint execution amounts, each target overprint execution amount is compared with an initial overprint execution amount, and the system selects the target overprint execution amount with the minimum error with the initial overprint execution amount and adjusts the initial overprint execution amount to form an actual overprint execution amount.
And in the second printing period to the Nth printing period, the system compares two color blocks in each plate width in sequence of overprinting, the first color block is a reference color block, the second color block is a target color block, the target color block in each plate width in the same period is compared with the reference color block to obtain at least one target overprint execution quantity, the target overprint execution quantity is compared with the initial overprint execution quantity, the system selects the target overprint execution quantity with the minimum error with the initial overprint execution quantity, and the initial overprint execution quantity is adjusted to form the actual overprint execution quantity.
The invention has the beneficial effects that: the invention can freely arrange the positions of the color blocks according to the typesetting condition of the layout by presetting the identification numbers of the color blocks of the printing plate and inputting the numbers and the initial overprinting execution quantity into a system, and sets cameras behind a plurality of printing processes to scan images so as to form a plurality of image layouts. According to the method, operators do not need to do any labor force operation and processing, and can complete the overprinting completely and automatically only by inputting the relevant parameters into the control system, so that not only are manpower and material resources saved, but also the production cost is reduced, and the overprinting can be completed at a high speed, and the efficiency is greatly improved.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention;
fig. 2 is an image comparison of each version of the invention in the same set of versions.
The specific implementation mode is as follows:
the invention relates to a multiple positioning method in register printing, which is characterized in that blocks to be printed on a printing plate are numbered before printing, all color blocks after each printing process are scanned and shot by a camera in a printing period, the camera is provided with a light source, a plurality of image plates are formed by shooting by the camera, the number of the color blocks in each plate is increased progressively according to a printing sequence, finally, the image plates with target color blocks are identified by a system according to register relations, error values between the target color blocks in the image plates and the register relations are calculated, and the system adjusts the execution amount of a register execution mechanism through the error values to realize accurate register printing.
Specifically, the overprint relationship is a relationship between an initial overprint execution amount and a target overprint execution amount, wherein the initial overprint execution amount needs to be input into the system before printing starts. The target overprint execution amount is determined by the difference in position between the target patch and the reference patch, i.e., the distance between the two patches in the longitudinal and lateral directions.
The printing cycle is the printing cycle of each color block on the printing plate, and if the number of the color blocks on the printing plate is M, M or M +1 printing plates are formed in one printing cycle according to the number of the color blocks. The number of the plate frames depends on whether the paper tape is white cardboard, if the paper tape is the white cardboard, the first color block is a reference color block, image scanning is not needed before printing, and each image scanning is after color block printing, so that the number of the plate frames is the same as that of the color blocks, and is M; if the original color block exists in the paper tape, image scanning needs to be performed before printing, so that the number of the plate width is one more than that of the color block, and is M + 1.
In each version of the first printing cycle, the system takes a first color block shared in each version as a reference color block, all target color blocks are compared with the reference color block to obtain a plurality of target overprint execution amounts, each target overprint execution amount is compared with an initial overprint execution amount, and the system selects the target overprint execution amount with the minimum error with the initial overprint execution amount and adjusts the initial overprint execution amount to form an actual overprint execution amount.
After the first printing cycle, the paper tape enters a normal high-speed overprinting mode, so that in the second printing cycle to the Nth printing cycle, the system compares two color blocks in the overprinting sequence in each plate, the first color block is a reference color block, the second color block is a target color block, the target color block in each plate in the same cycle is compared with the reference color block to obtain at least one target overprinting execution quantity, the target overprinting execution quantity is compared with the initial overprinting execution quantity, the system selects the target overprinting execution quantity with the minimum error with the initial overprinting execution quantity, and the initial overprinting execution quantity is adjusted to form the actual overprinting execution quantity.
It should be understood that the above-mentioned embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the invention, therefore, all equivalent modifications of the principles of the present invention should be included in the scope of the present invention.
Claims (5)
1. A multiple positioning method in register printing is characterized in that: numbering color blocks to be printed on a printing plate before printing, scanning all color blocks after each printing process in a printing period to form a plurality of image layout frames, increasing the number of the color blocks in each layout frame in a printing sequence, identifying the image layout frames with target color blocks by a system according to overprinting relation, calculating error values between the target color blocks in the image layout frames and the overprinting relation, adjusting the execution amount of an overprinting execution mechanism by the system through the error values, and selecting the execution amount with the minimum error for adjustment to realize accurate overprinting; the overprint relationship is a relationship between an initial overprint execution amount and a target overprint execution amount, wherein the initial overprint execution amount needs to be input into the system before printing starts.
2. A method of multiple positioning in register printing as claimed in claim 1, wherein: the target overprint execution amount is determined by the position difference between the target patch and the reference patch, i.e., the distance between the two patches in the longitudinal and transverse directions.
3. A method of multiple positioning in register printing as claimed in claim 1 or 2, in which: the printing cycle is the printing cycle of each color block on the printing plate, and if the number of the color blocks on the printing plate is M, M or M +1 printing plates are formed in one printing cycle according to the number of the color blocks.
4. A method of multiple positioning in register printing as claimed in claim 3, wherein: in each version of the first printing cycle, the system takes a first color block shared in each version as a reference color block, all target color blocks are compared with the reference color block to obtain a plurality of target overprint execution amounts, each target overprint execution amount is compared with an initial overprint execution amount, and the system selects the target overprint execution amount with the minimum error with the initial overprint execution amount and adjusts the initial overprint execution amount to form an actual overprint execution amount.
5. A method of multiple positioning in register printing as claimed in claim 3, wherein: and in the second printing period to the Nth printing period, the system compares two color blocks in each plate width in sequence of overprinting, the first color block is a reference color block, the second color block is a target color block, the target color block in each plate width in the same period is compared with the reference color block to obtain at least one target overprint execution quantity, the target overprint execution quantity is compared with the initial overprint execution quantity, the system selects the target overprint execution quantity with the minimum error with the initial overprint execution quantity, and the initial overprint execution quantity is adjusted to form the actual overprint execution quantity.
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| CN111761956A (en) * | 2020-07-20 | 2020-10-13 | 浙江优仆包装有限公司 | Multi-positioning printing method for paperboard color printing |
| CN112848720B (en) * | 2020-12-31 | 2022-11-15 | 陕西北人印刷机械有限责任公司 | Novel full-automatic pre-overprinting method of gravure printing machine |
| CN116653461B (en) * | 2023-06-07 | 2023-12-05 | 无锡中江彩印包装有限公司 | Multiple positioning printing method for paperboard color printing |
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| CH694219A5 (en) * | 2000-02-10 | 2004-09-30 | Bobst Sa | A method of automatic registration of prints in a rotary machine and device for carrying out the method. |
| CN101152782A (en) * | 2006-09-26 | 2008-04-02 | 王志洁 | Three-mark printing block group for automatic overprint of printing machine |
| CN102211451A (en) * | 2011-03-18 | 2011-10-12 | 武汉华茂工业自动化有限公司 | Chromatography system for printing machine |
| CN102582243B (en) * | 2012-02-13 | 2014-06-11 | 西安航天华阳印刷包装设备有限公司 | Full-servo back label printing, intaglio printing, rotary screen printing and embossing register control method |
| CN102922879B (en) * | 2012-10-09 | 2015-07-08 | 宜昌宏裕塑业有限责任公司 | Color code type automatic positioning product detection device and method |
| CN103802449A (en) * | 2012-11-14 | 2014-05-21 | 宜昌市正中科技有限公司 | Double-head overprinted colour scale group |
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| CN203681008U (en) * | 2014-02-25 | 2014-07-02 | 湖北宜昌龙鼎印务有限公司 | Polychrome printing positioning device |
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Address after: 515000 block A-F, 4a2-2, 2m4, 13-02, Jinyuan Industrial City, Chaoshan Road, Shantou City, Guangdong Province Patentee after: Guangdong Dongfeng New Materials Group Co.,Ltd. Address before: 515000 block A-F, 4a2-2, 2m4, 13-02, Jinyuan Industrial City, Chaoshan Road, Shantou City, Guangdong Province Patentee before: SHANTOU DONGFENG PRINTING Co.,Ltd. |
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Effective date of registration: 20240508 Address after: 655600 Chengxi 1st Road, Development Zone, Zhongxin Town, Luliang County, Qujing City, Yunnan Province Patentee after: LULIANG FUPAI COLORFUL CO.,LTD. Country or region after: China Address before: 515000 block A-F, 4a2-2, 2m4, 13-02, Jinyuan Industrial City, Chaoshan Road, Shantou City, Guangdong Province Patentee before: Guangdong Dongfeng New Materials Group Co.,Ltd. Country or region before: China |