With the innovation of printing technology, the emergence of new process methods and the widespread application of computer technology in the printing industry, coupled with the consumer's demand for printed matter tends to be personalized, timely, small batch, fast and other new requirements, the printing industry Revolutionary changes have taken place and the printing process has evolved from analog to fully digital. Digital printing eliminates many time-consuming steps in the process and provides an innovative and efficient method for production and information exchange. Its function is far better than traditional printing. The increasing application field of digital printing has penetrated into various fields of advertising and printing. Designers can display their design concepts in this high-quality and varied form to gain a competitive advantage. Instant printing increases the company's operational efficiency to ensure information updates and save storage space. In addition, marketing staff will display personalized prints to customers Will get better customer response. In short, digital printing has a wide range of applications due to its fast, efficient and flexible data printing. The statistical results show that the requirements for small batch instant printing have reached 60% of all printing needs at the end of the last century, and these 60% of the business is often a difficult task for traditional printing.
The production of digital color printing is to replace ink with toner or ink on digital printing presses. The color pigment of its colorant can obtain a higher density than the offset production standard IS012647. The color gamut of its performance is richer than the printing ink. The color gamut is combined with good color management software, so that it can not only simulate The effect of general printed matter can also simulate other production effects, such as screen printing, digital printing, inkjet posters, etc., and even simulate the performance of high-speed rotary printing presses, which can better meet the requirements of the increasingly diversified output in the market.
As a kind of digital printing, digital proofing is a new type of proofing technology based on the digital publishing printing system, which processes the page graphic information and directly outputs color proofs according to the publishing printing production standards and specifications. Digital proofing digitally adopts 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 a traditional printing proof with a digitalized manuscript (electronic file). In addition, digital proofing has advantages over traditional proofing in terms of output speed stability and cost efficiency, so digital proofing has been widely recognized in the industry.
With the development of various digital printing technologies, how to correctly judge the operating status of digital printing presses and objectively evaluate their printing quality becomes particularly important. Generally, the test (test) printing plate is an indispensable test plate for debugging the printing machine. The digital test plate is a comprehensive diagnostic and measurement tool. It is actually an electronic file, which is designed to help the printer at low consumption and equipment preparation time. Get high-quality color prints in less cases. It can not only evaluate the printing quality but also test the faults in printing and analyze the causes of the faults.
As a machine debugger and a digital printing press operator of a digital printing press manufacturer, you can determine the working status of the digital printing press by making copies of the test version and make corresponding adjustments to improve work efficiency.
Generally, the digital test version used for digital printing (or digital proofing) evaluation standards includes different quality control targets, which are divided into three categories according to their uses: diagnostic targets, process control targets, and standardized targets. Diagnostic targets are used for printing system fault detection, such as stars, etc .: Process control targets are used to monitor the status of the printing system: standardized targets such as color control bars, gradation scales, color targets, vignette, etc. Features: such as gray balance chart, ink overprint, etc.
From the perspective of printing quality detection and control theory and methods, the main parameters affecting print quality are: solid ink density, ink trapping characteristics, gray balance data, ink overprint rate, resolution of images and equipment, maximum reproducible, Minimum dot percentage, dot printing characteristic curve and elements sensitive to output resolution, printing direction, moiré and screen pattern. Therefore, the basic components of the digital test version are generally: solid density block, registration block, gray balance block, color control bar, dot ladder GATF star, IT8,713 color target (or other standard color target), text resolution Rate blocks, standard figure portraits, decorative illustrations, etc.
The digital printing test version shall include the test strip part and the standard image part. The test strip part includes information block, text block, star mark, halftone dot control block (40% and 80%), gray balance control color block, solid color block, halftone dot ruler block, used to detect tone and color copy printing contrast , Output resolution, gray balance, etc .; the left picture of the standard image part is used to evaluate the reproduction characteristics of highlights and achromatic colors, and the right picture is used to evaluate the subtle levels, reproduction clarity and image processing effects. Obviously, through the measurement and analysis of the corresponding data, the print quality of the output sample can be objectively evaluated.
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 operating process, and at the same time have and Use printing quality control tools, such as standard digital test plates and supporting standard data printing quality testing instruments, etc., so it is recommended that in the control of digital printing process, each printing plant should establish basic printing quality control data guidance according to international relevant standards and customer requirements produce.
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