With the continuous strengthening of people's aesthetics and the continuous improvement of environmental protection requirements, green printing extended from green tobacco has been rapidly developed. The combination printing process mainly based on narrow-width flexographic printing is being met because of meeting this requirement. It is widely used in the packaging of medium and high-grade soft cigarette cases (such as Honghe 88, Honghe 99, and treasure white sand series, etc.). As everyone knows, flexographic printing is famous for environmentally friendly water-based ink printing. Screen printing is thick with a thick ink layer and a wide range of substrates. Offset printing has a strong sense of layering and a soft transition. Gravure printing has a thick ink layer and high printing durability Featured. As a result, the combination of flexographic printing, screen printing, flexographic printing, screen printing and gravure printing, the combination of flexographic printing, screen printing, gravure printing and offset printing and the connection transfer, cold stamping, The combined process of die cutting unit. Among them, the combined process of flexographic printing-based combined printing line transfer, cold stamping, and die-cutting unit is a new comprehensive process that optimizes the combination of the four major printing methods based on product characteristics and flexographic printing. Peers discuss the characteristics of combined printing process. Features of combined printing process 1. Differences from a single printing process The flexographic printing-based combined printing process uses web printing, the base material is mostly 80-100g / m2 web coated paper, the selection range of the substrate is relatively single, the paper printing method is narrow; the ink system is Mainly based on water-based ink, combined with ester, alcohol-soluble gravure ink, UV offset printing ink, screen printing ink, compared with the single printing method, the control system ink viscosity, product hue, and drying conditions are more difficult to control; combined flexographic printing The structure of the machine is very similar to the web gravure printing machine, generally consists of the unwinding part, the flexographic printing unit, the screen printing (gravure printing, offset printing) unit, the glazing unit and the registration, die cutting, waste discharge, rewinding part Composition, the machine speed is slower than the single printing method; but the movable operation control panel and the optional optimized combination are unmatched by the single printing method, especially its enhanced line transfer, cold stamping, die cutting The function avoids the defects of long production cycle, complicated process, easy deformation of paper and many registration waste products in single printing mode. 2. Similarities with single printing process The flexographic printing, offset printing, and screen printing units have relatively low printing resistance, the tension between the flexographic printing units is not easy to control, and the hue of the gravure printing unit is stable. These characteristics are similar to those of single offset printing, gravure printing, screen printing, and flexographic printing. The printing process for printing is the same. Difficulties of combined printing process 1. Calculation of registration zoom between different printing methods For the products printed by the combined printing process, after the design of the process route is completed, the printing plate is then produced. The flexographic plate, gravure plate, offset plate, silk screen plate, glazing plate and embossed plate, die-cut plate are single When the printing process is produced, according to the paper, printing environment, machine, registration accuracy requirements and past practical experience, they all have their own zoom parameters. When several printing methods are combined together, the previous zoom parameters can only be used as a reference, must According to the paper used, the ink drying method of various printing methods, the normal speed, and the selected plate material, the plate making parameters are initially determined, and the new parameters are explored through proofing to find the best zoom between the various plates. This work is the most critical and the most difficult for combined printing. Generally, the paper with stable performance (including composite and transfer base paper) and ambient temperature and humidity are first determined, and then the combination of the individual scaling of each printing method and the plate, printing film, and drawing used is combined. The production of small prototypes is carried out in a way, and the production printing plates are determined after proofing. This process will try to avoid repeated times. 2. Control of ink in the production process The printing process is mainly to control the ink viscosity and hue. Flexographic printing uses ceramic anilox rollers to supply ink indirectly, gravure printing uses immersion direct ink supply, screen printing uses a scraping device to move ink directly on the screen, and offset printing uses ink rollers to supply ink indirectly. Flexographic printing inks are roughly divided into water-based inks, alcohol-soluble inks and UV inks. Gravure inks are now mainly represented by ester-soluble and alcohol-soluble inks. Screen printing inks are typically UV and anti-counterfeiting inks. Offset printing is mainly based on UV inks. It is widely used in medium and high-end combined printing. Different ink supply methods and inks of different systems make it more difficult to control the ink in the combined printing production process. Generally, the same system of ink and one machine with multiple ink adjusters are used to reduce the difficulty of operation control. 3. The quality requirements of the operator Combined printing connection post-processing is a combination of several single printing methods such as connection transfer, cold stamping, die cutting unit, etc. It puts forward high quality requirements for the operator, requiring them not only to know the machine structure and registration device, You must also have a thorough understanding of the four major printing processes and post-press processing principles, and be familiar with the operation of the equipment and the adjustment of ink hue and viscosity. Generally, it is necessary to pass multi-layer training for captains with rich work experience to ensure that all skills are qualified to ensure product quality. In short, with the rapid development of middle and high-end cigarette labels in the direction of integration and soft packaging, the combination process of combination printing line transfer, cold foiling, die cutting and other elements based on flexographic printing will become more and more perfect, and It is continuously used in the printing process of cigarette packets. The above are some of the author's experience and experience. If there is any improper behavior, please let my colleagues criticize and correct me! Snake Tongs,Snake Hooks,Aluminum Snake Hook,Catcher Stick Snake Tong Hebei Liebang Metal Products Co.,Ltd , https://www.lb-animaltraps.com