![<?echo $_SERVER['SERVER_NAME'];?>](/template/twentyseventeen/skin/images/header.jpg)
CIP3 means that the computer integrates pre-press, printing, and post-press, which can connect pre-press equipment (such as computers, scanners, digital cameras, imagesetters, direct plate-making machines, digital proofers, etc.) with printing machines, paper cutters, and folding The machine is connected by means of network, floppy disk, Smart card or manual input of data. The original experience is replaced by data, and the printing process is managed by data, so that the machine can achieve data and standardized management under normal linearization standards. High quality, high yield and low cost. CIP4 adds a lot of more complete information collection, tracking, analysis on the basis of CIP3, and even has to make special instructions on the instructions, such as the ink color printing Lab value requirements, the number of different editions in printing, etc., by Prepress, Press, Postpress and other 3P, plus the fourth P of Data Processing data processing, has become a new organization of CIP4, and the CIP4 organization basically provides specifications, and is not a software and hardware producer itself, and CIP 4 The work order is changed to the JDF file method, and the workpiece customer, name specifications, needs and special requirements, precautions, even Lab color value density requirements and post-press processing parameters are also written in. If the area ratio of each ink area is completed, JDF (Job Definition Format) working documents can be stored together. JDF documents are changed to XML extensible language, which can install more new work instructions and regulations than the PDF language used by CIP3, and the XML language can also be used. One of the languages ​​used across multiple platforms.
1. Traditional ink preset method
In the traditional way of ink presetting, the printing machine operator usually pre-adjusts the amount of ink discharged by the ink spoon based on experience. Estimate the approximate ink volume of each ink area according to the graphic and text distribution of the printing plate or sample before starting up, as the preset value of the ink volume, and further adjust according to the specific changes of the printed matter after starting up. Obviously, this ink discharge method is relatively rough, and the accuracy is greatly different due to different operating experience and subjective understanding of people. This kind of pre-discharging method from the start to the official printing, the paper consumption is large, the adjustment is time-consuming, and the work intensity of the machine operator is correspondingly increased.
2. Pre-inking technology based on CIP3 / CIP4 standard
At present, CIP3 or CIP4, which is mentioned by most manufacturers, is the transfer of pre-discharge data and the maintenance of print quality stability. In terms of auxiliary ink discharge, the most important thing is to help the printing operator save the inconsistency of manual ink discharge and waste of time. The required ink discharge data is obtained directly from the pre-press data file, and is sent to the printing after a simple conversion The ink control console of the machine adjusts the pre-discharging, because this auxiliary ink-discharging method greatly saves time and thus improves efficiency.
In addition to the original integrated operating system, the pre-discharging system of the offset printing press also uses the method of other manufacturers' systems. The purpose is to be able to use the familiar visual operating system independently of different printing machine systems, so that not only can the printing machine pre-discharge ink, but also can be connected to the printing machine to scan the guide table and automatic feedback, etc. Wait.
1. Generation of pre-discharge data
To pre-ink the printing press before powering on, the most important thing is to pass the pre-press large-format file to the corresponding conversion software after processing and then pass it to the printing press operating system. However, the number of ink zones per color of the printing press is not the same for every equipment manufacturer. For Heidelberg's startup, it is 32 ink zones per unit, and the width of each ink zone is 32.5mm. 700 is 34 ink areas, and the width of each ink area is 30 mm. Before the advent of CIP3, printing press operators mostly performed pre-discharging operations based on the dot area ratio of each ink zone on each color plate. Press the button by hand to adjust the opening and closing degree of the ink key. Taking the four-color printing machine with 32 ink keys as an example, the four-color ink should be moved to at least 128 ink keys at a time, and each ink key must be added again. The action of ink or ink reduction means that the press operator must keep pressing the up and down keys to add or subtract ink.
In the past era of manual large-format printing, the printing plates printed with film were taken to the scanning machine, and the dot area ratio of the entire layout was scanned according to the ink area of ​​the printing machine to obtain the dot area percentage of each ink area. Then the percentage of each ink zone is transferred to the operating system of the printing press, and the printing press can adjust the amount of ink for each color and each color version. The printing plate scanner is a large-scale scanner that specifically measures the percentage of printing plate internet points in each ink zone.
Now that you have the large-format file data, you only need to calculate the large-format file to get the dot area ratio of each ink area. For the printing plate, the dots on the plate are not only divided into sizes, but each dot is completely black, and it is also the smallest unit that accepts ink. These dots are smaller in the 1-bit Tiff file. The same points make up.
In fact, the 1-bit Tiff file is to let the laser imagesetter or CTP plate-making machine know what to do and what not to do. Regardless of their size, these dots are black dots. After the information is transferred to the plate, the main function is to accept ink.
In summary, whether it is the percentage of ink dots obtained from the scanner or the percentage of ink dots calculated from the 1-bit Tiff file, the entire layout is based on the ratio of black (dot) and white (blank) According to the size of the ink zone (inkzone), calculate the amount of ink that each ink zone should have. Therefore, if the pre-press ink percentage is obtained, it can be calculated from the large-format PDF file or the 1-bit Tiff file generated from the large-scale version after RIP. In order to achieve the purpose of data exchange, it must be written in a common format, the most common format is the PPF file format developed by CIP3, or the JDF file format of CIP4. Most of these standard formats can be obtained by RIP, and most of them can accept 1-bit Tiff or PDF large-scale data files in terms of using interfaces. [next]
2. Transmission of pre-discharge data
With the pre-discharge data, it is not possible to directly control the ink key of the printing press. The PPF file records the dot area ratio of each ink zone, but it is impossible to achieve the same effect for printing presses of different manufacturers. The data on the PPF file obtained from the large version file is relatively fixed for the same type of printing machine. After the pre-discharge data is transmitted to the control machine of the printing press, it must be adjusted by the ink discharge curve of the printing press operating system, so as to ensure that the gap of the ink key pre-adjustment can get the effect we need.
At present, the most widely used software at home and abroad to connect CIP3 / 4 PPF or JDF files to the printing press console is InkZone series software developed by Swiss Digital Information Ltd. The following uses InkZone software as an example to illustrate the transmission of pre-discharge data.
DI-Plot software is designed to increase the productivity of the printing industry. Its unique conversion and calculation tools can read 1-Bit TIFF, 8 Bit TIFF, CIP3 / 4 format files, and can be converted into the required output formats such as CIP4 / JDF, PDF, TIFF, etc. Here DI-Plot reads 1-bit Tiff files or PPF files to get pre-discharge data and stores it in .ink format. For example, after the CTP version of a printed copy A, a copy of A0.ppf is generated. At the same time, this A0.ppf file is transferred to the DI-Plot software. DI-Plot first converts A0.ppf into InkZone's internal file format A0. InkZone PERFECTOR software is converted into a format that the machine can recognize. If it is a Heidelberg printing machine, InkZone PERFECTOR will convert A0.ink to A0.hei. If it is a Manroland printing machine, it will be converted to A0.man. The machine is converted into A0.kom, and then these corresponding data are transferred to the ink control console of the printing machine. If these data are adjusted by the operator during the printing process and meet acceptable quality requirements, the adjusted ink control data (A1.hei or A1.man or A1.kom) will be stored back to InkZone PERFECTOR In the hard disk for future linearization.
However, due to the non-linear relationship between the ink output of the printing press ink fountain and the nominal scale, the layout ink data calculated based on the analysis of the layout information of the layout is linear data, and due to the long service life of the machine and the wear of the machine, the ink fountain ink The key is in a non-standard state, coupled with the type of printing materials, inks, plates used, the temperature and humidity of the environment, etc. At this time, it is very necessary to adjust and convert the pre-discharge data to make it compatible with The actual ink discharge data of the ink fountain tends to be consistent.
3. The method of stable ink control
Although the pre-discharging curve is set, due to the influence of many factors such as the structure of the ink path of the printing press, the characteristics of the ink, the layout of the graphic and the text, and the speed of the printing press, it has not been possible to reach the ideal density value just after It has been maintained until the end of printing. Therefore, various methods must be used to achieve stable and accurate ink control.
â‘ Subjective visual method. This method is based on the subjective observation of the human eye, but not necessarily fast. Because the human eye is the most sensitive but also the most susceptible to fatigue, and the ink keys on the four color plates must be taken care of at the same time. With 32 ink keys per unit, 128 ink keys need to be adjusted, although not every Each ink key needs to be adjusted, but the workload is also quite large, and the judgment and experience of each printing press chief are also different, often causing instability in quality.
â‘¡Instrument measurement method. In this method, the printing operator usually takes the printed product to the sample stand, and uses a density meter or a spectrophotometer to scan the color blocks of each ink area on the color guide table to know which color plate and which ink key. Need to add and subtract ink, and then pass this information to the stepper motor on the ink key to adjust the amount of ink discharged. There are also equipment manufacturers that have developed monitoring instruments that scan the color value of the entire print, instead of scanning a single color guide, such as Heidelberg's CPC system.
3. Summary
CIP3 / 4 ink preset technology is now more and more used in production, which can reduce the use of paper and ink, greatly reduce production costs, and improve the competitiveness of enterprises. Moreover, the ink preset system using pre-press documents has high accuracy. The increase in accuracy means that the color effect of the sample can be achieved without having to perform multiple trial printing, and naturally the paper and ink used in many trial printing are reduced.
â‘ Shorten the start-up preparation time and improve the efficiency of the printing press. An imported four-color printing machine can complete the single-sided four-color registration and color correction of the printing plate in 10 minutes, which shortens the traditional time for printing and color correction, and adapts to the time requirements of short version.
â‘¡It has the function of optimizing the ink volume data to improve the accuracy of ink volume presetting and the accuracy of ink volume control. Since the introduction of the data process replaces the manual color calibration, it can ensure that the printed samples are consistent with the printed products, and can be repeated repeatedly, which can adapt to the current customers' high quality requirements for colors.
â‘¢ Reduce production costs. Because of reducing the number of trial printing and shortening the preparation time of the printing machine, it means more time for normal production work. Thereby reducing certain fixed expenses that the enterprise should pay, greatly reducing the production cost.
Therefore, the introduction of CIP3 / 4 technology has to be a major breakthrough for improving the quality of printed materials, reducing costs, increasing benefits, expanding new markets, and improving the competitiveness of enterprises.
Full Cassette Motorized Retractable Awning
Full Cassette Motorized Retractable Awning,Motorized Retractable Folding Arm Awnings,Full Cassette Retractable Motorized Awning,Full Cassette Retractable Motorised Awning
Hebei Charlotte Enterprise Co., Ltd. , https://www.clshadesails.com