1. Era requirements of the system In recent years, with the continuous development of printing technology, the fundamental application of modern printing product quality detection application technology has also undergone a fundamental change, gradually developing towards the direction of multi-dimensional digital products. In the front-end field, digitalization has been basically realized. At the same time, although the printing technology is constantly updated and the printing process is constantly improved, in the aspect of printing quality management of printed products, there has not been a more scientific method to fully guarantee the effective implementation of digital printing. Conventional printing management The model has not adapted to the development direction of digital printing. How to achieve the effective integration of the printing process, post-press and pre-press digitization, and fully penetrate the digital management model into the print production process has become one of the important issues that high-quality printing companies urgently need to solve. Second, the basic principle of the system sets the standard detection weight of the batch of products, adopts the fuzzy mathematical conversion principle based on probability theory and mathematical statistics, and expresses the fuzzy concept as intuitive data. On this basis, within the effective printing range of the layout Set up digital detection signal bar, collect data by measuring equipment such as reflection density meter and transmission density meter, then perform data processing and analysis, refer to the corresponding standard weights, and deduct the corresponding points (0 ~ 64 is unqualified, 64 ~ 84 Divided into qualified, 84 to 100 divided into excellent), to assess the printing quality of products, find the cause of quality problems, scientifically and effectively control the printing quality of products throughout the process. 3. The hardware and software configuration of the system According to the overall design of the system, the entire system consists of two parts: the hardware system and the software system. The main hardware configuration is: computer (operating system above Windows98) to realize data entry, exchange, analysis and output; printer to realize report printing function; color reflection densitometer to realize the printing data, proofing data, printing Data collection and entry; transmission density meter to collect and enter the data of laser emission film; digital magnifier to measure the size fit in the plate making process and printing process. The main framework of the software system was developed by Visual C ++ 6.0. For a long time, the quality inspection of printed products has undergone development processes such as subjective visual inspection, density inspection, chroma inspection, and image inspection-based quality inspection technology. In the current pursuit of higher quality requirements for printed products, chromaticity detection technology and image processing-based quality detection technology are difficult to promote due to the high operating environment requirements and expensive equipment. The density detection method is to achieve standardization and standardization of printing quality detection An important way of refinement, the digital measurement and control system developed based on this method is an important measure to achieve the standardization of the quality of printed products and has a long-term significance and role for the healthy development of the printing industry. In addition, the printing information database was developed using SQL Server database language, and the program can directly operate the database. This design scheme not only utilizes the powerful programming function of Visual C ++, but also uses the SQL Server to access, query and +++++++++ editing ++++++++++ functions of the database, which is fully adapted to many Features, big data products and fast data updates. The software is mainly composed of two modules: quality assessment and statistical query. Through four subsystems of quality management, production management, administrative management and equipment management, product quality production process control; personnel management and raw material consumption control; product data storage, management and Output. Fourth, the system's work flow is based on the laser publishing of the plate-making film and the acquisition of printed manuscript data. First, the original data is accepted and the theoretical data is calibrated. Afterwards, the enterprise technical department issues a batch production task operation notice. Require the implementation of print quality acceptance tasks. According to the operation instructions and technical control standards, the technical staff of the printing team directly extracts and analyzes the data of the printing measurement and control database, and implements the first-level acceptance of printing quality assessment; the workshop technicians and the technical department of the enterprise organize the printing of pre-press film and printing plates Materials, proofing samples, printed semi-finished products, and finished printed products are randomly selected for inspection, and second-level assessment and third-level acceptance of printing quality are implemented. At the same time, through the functions of statistics and inquiries on printing data and printing results, the whole process of printing is monitored in a planned way, and finally the printing quality control data of the finished product is printed in a report form to fully grasp the printing quality and timely feedback the printing production information. Control the printing quality of products throughout the process. Fifth, the main measurement control index of the system 1. Fitting accuracy: relying on the digital magnifying glass and using the theoretical size of the printed matter to measure the difference between the size of the main color plate printed and the theoretical size. On the basis of normal absolute accuracy, the Comparing other color plates with the main color plate, the standard range is 0 ～ 0.20mm, and the standard range of laser film is 0 ～ 0.15 mm 2. Deformation of dots: use a reflection densitometer and a transmission density meter to first measure the deformation of a single dot and take the maximum value, then take the average value of each screen dot as the final evaluation of the dot deformation, the standard value is 15% + 10%, 40 % + 18%, 75% + 13%. The standard value of laser emission film is ≤ 2%, achieving 3% dots clear, 96% dots are not blurred, and the mesh angle error is ≤ 5 °. 3. Printing ink color: first set the standard density value of the batch of products according to the printing specifications and color standards, and then take the absolute value of the difference between the density value of each version measured by the reflection densitometer and the corresponding standard value of the corresponding version Printing ink color evaluation value, the paper background color directly takes the maximum value of the density measurement value as the background color evaluation value, and finally takes the maximum evaluation value as the printing ink color and hue correction calculation value. The standard value of the solid density of the laser film is 3.60, and the haze ≤0.05. 4. Comprehensive information: It is mainly used to control the finished product size error, cutting error, whitening, blushing, blurring, ghosting, bumps, dirt, scratches, paper damage, splicing, data Comprehensive quality of errors and omissions and uniformity of the entire product. The deductions caused by random causes are not standardized, so we limit their standard deductions in the system. The deduction limit is expressed in red (green is good, yellow is qualified, and red is unqualified).
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Changes in application technology of modern printing quality inspection