Inkjet in the field of digital printing applications and standards

With the innovation of printing technology, the emergence of new process methods, and the wide application of computer technology in the printing industry, together with the demand of consumers for printed matters tends to be personalized, timely, small batch, fast, and other new requirements, the printing industry There has been a revolutionary change and the printing process has evolved from analog to digital. Digital printing eliminates many of the time-consuming steps in the process flow that provide an innovative, efficient method for production and information exchange that far exceeds traditional printing. The increasing application of digital printing has penetrated into all areas of advertising and printing. Designers can demonstrate their design concepts through this high quality and variety of forms to gain a competitive advantage. Instant printing enables the company to operate more efficiently. Ensures information updates and saves storage space. Other 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 of small batches has reached 60% of the total printing demand at the end of the last century and this 60% of the business is often the task of traditional printing.

Digital color printing is produced by using toner or ink instead of ink on a digital press. Because the color pigments of the colorants can obtain higher density compared with the offset printing standard IS012647, the color gamut of the color inks is richer and richer than that of the printing inks, and the cooperation of good color management software makes it possible to simulate not only The effect of general print can also simulate other production effects, such as screen printing, digital printing, inkjet posters, and even simulate the performance of a high-speed rotary press, and can meet the increasingly diversified output requirements in the market.

Digital proofing is a new type of digital proofing technology. It is based on the digital publishing printing system. It is a new proofing technology that directly outputs the color proofs according to the publishing and printing production standards and specifications. Digital proofing digitally uses large-format printers to directly output proofs instead of the traditional proof-making process. The digital proofing system generally consists of a color inkjet printer or a color laser printer to obtain verification proofs by digitizing a manuscript (electronic file) that simulates the color proofing of traditional printing. In addition, digital proofing is superior to traditional proofing in output speed stability and cost efficiency. Therefore, digital proofing has been widely recognized by the industry.

With the development of various digital printing technologies, how to correctly judge the running status of a digital printing press and objectively evaluate its printing quality is particularly important. Usually a test (test) plate is an indispensable test version of the commissioning press and a digital test version as a comprehensive diagnostic and measurement tool is actually an electronic document designed to help printers in low consumption, equipment preparation time Get high-quality color prints with less. It can both evaluate the print quality and can test the cause of the failure by failure analysis in printing.

Operators of machine debuggers and digital printers as manufacturers of digital printers can determine the working status of digital printers and make corresponding adjustments by copying the test version to improve work efficiency.

In general, digital betas for digital printing (or digital proofing) evaluation standards include different quality control targets divided into three categories based on their use: diagnostic targets, process control targets, and standardized targets. Diagnostic targets are used for fault detection of printing systems such as stars, etc.: Process control targets are used to monitor the status of printing systems: standardized targets such as color control strips, step scales, color targets, and vignettes are used to measure the printing system Features: such as gray balance diagram, ink overprint and so on.

From the perspective of the theory and method of quality inspection and control of printed products, the main parameters affecting the quality of printed products are: ink density on the ground, ink trapping characteristics, gray balance data, ink overprint rate, resolution of images and equipment, and maximum reproducibility. Minimum dot percentage, dot print characteristics, and elements sensitive to output resolution, print orientation, moire, and screening patterns. Therefore, the basic components of the digital test version are generally: solid density blocks, registration blocks, gray balance blocks, color control bars, dot-gauge GATF stars, IT8,713 color targets (or other standard color targets), text resolution Rate blocks, standard portrait portraits, decorative illustrations, etc.
It includes a test strip section and a standard image section. The test strip section includes information blocks, text blocks, stars, halftone dot control blocks (40% and 80%), gray balance control color blocks, solid color blocks, and network point ladder blocks for detection of tone and color reproduction. , output resolution, gray balance, etc.; the left portion of the standard image section is used to evaluate high-light and non-color reproduction characteristics, and the right image is used to evaluate subtle levels, reproduction resolution, and image processing effects. Obviously, through the measurement and analysis of the corresponding data, the print quality of the output proofs can be objectively evaluated.

Since the control standard data in the printing process will fluctuate with the characteristics of the printing materials (paper, ink, etc.) used by the manufacturers, in order to correctly evaluate the quality of digital printing, it is necessary to focus on the establishment of a standardized workflow, and The use of printing quality control tools, such as standard digital test version and supporting standard data printing quality test instruments, etc., so it is recommended that in the digital printing process control, each printing factory should establish the basic control data of printing quality according to international standards and customer requirements produce.

Reprinted from: the printing of today: Cao army Zhoushi Sheng Cheng Nan