Specifications and standards for inkjet applications in the field of digital printing
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With the innovation of printing technology, the emergence of new process methods and the wide application of computer technology in the printing industry, coupled with the consumer demand for printed materials tends to be personalized, timely, small batch, fast and other new requirements, the printing industry A revolutionary change has taken place, and the printing process has evolved from analog to full digital. Digital printing eliminates many time-consuming steps in the process flow to provide an innovative and efficient method for production and information exchange that is far more effective than traditional printing. The growing use of digital printing has penetrated into all areas of advertising and printing. Designers can demonstrate their design concepts in this high-quality and multi-variant form to gain a competitive advantage. Instant printing increases the efficiency of the company's operations, ensures information updates and saves storage space. In addition, marketers display personalized prints to customers. Will get a better customer response. In short, digital printing has a wide range of applications due to its fast, efficient and flexible variable data printing. The statistical results show that the requirement for instant printing in small batches has reached 60% of the total printing demand at the end of the last century. This 60% of the business is often the task of traditional printing.
Digital color printing is produced by replacing the ink with toner or ink on a digital press. Because of the color pigment of its toner, the standard IS012647 can achieve higher density. The color gamut of its performance is richer than the color gamut of printing ink, coupled with the good color management software, so that it can not only simulate The effects of general prints can also simulate other production effects, such as screen printing, digital printing, inkjet posters, etc., and can even simulate performance under high-speed rotary presses, and can also meet the increasingly diversified output requirements in the market.
As a way of digital printing, digital proofing is a new proofing technology that directly outputs color proofs based on the digital printing and printing system, according to the printing and printing production standards and specifications. Digital proofing digitally uses a large format printer to directly output proofs to replace the lengthy proofing process such as traditional film-making. The digital proofing system is generally composed of a color inkjet printer or a color laser printer to obtain a proof sample by simulating the color of the conventional print proof with a digitized original (electronic file). In addition, digital proofing has advantages over traditional proofing in terms of output speed stability and cost-effectiveness, so digital proofing has been widely recognized in the industry.
With the development of various digital printing technologies, it is particularly important to correctly judge the operating status of digital printing machines and objectively evaluate their printing quality. Usually the test (test) plate is an indispensable test version for commissioning the press and the digital test version is a comprehensive diagnostic and measurement tool. It is actually an electronic file designed to help printers with low consumption and equipment preparation time. Get high quality color prints in rare cases. It can both evaluate the quality of the print and test the cause of the failure caused by the failure analysis in the print.
As a machine operator of a digital press manufacturer and a digital press operator, the digital press can be determined by copying the test version and debugged accordingly to improve work efficiency.
Typically, digital test versions for digital printing (or digital proofing) evaluation standards include different quality control targets that are classified into three categories according to their use: diagnostic targets, process control targets, and standardized targets. Diagnostic targets for printing system fault detection such as star marks: Process control targets are used to monitor the status of the printing system: standardized targets such as color control bars, step scales, color targets, vignettes, etc. are used to measure the printing system. Features: such as gray balance diagram, ink overlay, etc.
From the perspective of print quality control and control theory and methods, the main parameters affecting the quality of printed products are: ink solid density, ink trapping characteristics, gray balance data, ink overprint ratio, image and device resolution, maximum reproducibility, The minimum dot percentage, dot print characteristic curve and elements sensitive to output resolution, print orientation, moiré and screen pattern. Therefore, the basic components of the digital test version are generally: solid density block, register block, gray balance block, color control bar, dot ladder GATF star, IT8, 713 color target (or other standard color target), text recognition Rate blocks, standard portraits, decorative illustrations, etc.
The digital printing test version should include the test strip portion and the standard image portion. The test strip section includes information blocks, text blocks, stars, halftone dot control blocks (40% and 80%), gray balance control patches, solid patches, and dot ladder blocks for detecting tone and color reproduction print contrast. Output resolution, gray balance, etc.; the left part of the standard image section is used to evaluate the high-light tone and achromatic copy characteristics, and the right image is used to evaluate the subtle level, copy resolution, and image processing effects. Obviously, the measurement quality of the output proof can be objectively evaluated by the measurement analysis of the corresponding data.
Since the control standard data in the printing process will vary with the characteristics of the printing materials (such as paper, ink, etc.) used by the manufacturer, in order to correctly evaluate the quality of digital printing, it is important to establish a standardized operation process, and at the same time Use printing quality control tools, such as standard digital test version and supporting standard data printing quality testing instruments, so it is recommended that in the control of digital printing process, each printing factory should establish basic control data of printing quality according to international relevant standards and customer requirements. produce.