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1.Carton adolf printing machine product introduction
The flexographic printing machine is based on flexographic printing technology and uses flexible plates for printing. The graphic part of the plate is raised, and the blank part is concave. In the printing process, the mesh roller transfers the ink from the ink tank and evenly coating the raised graphic part of the printing plate, and then the printing plate is closely contacted with the carton surface through the embossed cylinder, so that the ink is transferred from the printing plate to the carton, thus completing the printing. This printing method can adapt to the certain roughness of the carton surface and achieve high quality printing effect.
2. Structure composition
Reel and feed system
The unwinding part is used to place the carton material in rolls, which can accommodate large paper rolls and has the automatic feeding function. The paper feed system can accurately and stably transport the carton material sheet by sheet to the printing area, and its advanced paper separation technology and tension control system ensure that the carton is in the best condition when entering the printing process, avoiding paper jams or paper deformation.
Printing unit
The printing unit is the core part, which is usually composed of multiple printing color groups to achieve multi-color printing. Each printing color set contains a plate roller, a mesh roller, and an impression roller. Plate cylinder install flexible plate, mesh roller precisely control the amount of ink transfer, stamping cylinder apply appropriate pressure to ensure good ink transfer. There is a high-precision registration device between each printing color group to ensure the accurate overprinting of different colors.
Drying system
The drying system is designed for the types of inks used in flexo printing of cartons (such as water-based inks, UV inks, etc.). Hot air drying, UV curing and other ways to quickly remove the solvent in the ink or UV ink curing. The parameters of the drying system such as temperature, wind speed and UV lamp power can be flexibly adjusted according to the printing speed and ink characteristics, ensuring that the ink is dried in a short time, improving printing efficiency and quality.
Winding and stacking system
The printed carton materials are neatly folded by the winding system. If the printing is for a single carton, the cartons are neatly stacked by the stacking system. The winding system has the function of tension adjustment and length counting to ensure the flatness and length accuracy of the winding. The stacking system can accurately stack cartons into stacks, which is convenient for subsequent processing and transportation.
Ink supply and control system
The ink supply system includes ink drums, ink pumps, pipes and filters, which can continuously and stably supply ink to the roller, and can accurately control the flow and pressure of the ink. The control system is the brain of the entire printing machine, the operator can set the printing speed, printing pressure, drying temperature, ink parameters and other operating parameters through the operation panel, and the control system also has the function of fault diagnosis, automatic alarm and production data recording.
3. Performance characteristics
High printing quality
It can print clear and delicate graphics on the surface of the carton, with bright colors and high saturation. Due to the elastic characteristics of the flexographic plate, it has a good adaptability to the small uneven surface of the carton and ensures the uniform transfer of ink. The high-precision registration system makes the overprinting precision of multi-color printing extremely high, which can meet the requirements of high-quality carton printing, such as packaging cartons for food, electronics and other products.
High efficiency
The printing speed is fast, which can meet the needs of large-scale carton production. Fast paper feeding, printing, drying and winding (or stacking) processes reduce the time spent in the printing process. At the same time, the high degree of automation reduces manual intervention and further improves production efficiency.
Strong flexibility
It can print cartons of different sizes and thickness. By simply adjusting the parameters of the printing press, such as printing unit spacing, pressure, etc., it can adapt to a variety of carton specifications. And it can easily change the printing plate and ink type to achieve carton printing with different design and functional requirements, such as ordinary packaging cartons, moisture-proof cartons, etc.
Environmental protection and energy saving
Environmentally friendly inks such as water-based ink or UV ink are used to reduce the emission of volatile organic compounds (VOCs) and meet environmental requirements. The design of drying system pays attention to energy saving, such as heat recovery and utilization of hot air drying, intelligent power control of UV curing system, etc., which reduces energy consumption and production costs.
4. Application field
Food and beverage packaging carton: the outer packaging carton for printing food, beverage and other products needs to meet the printing requirements related to food safety, such as the use of environmentally friendly ink, printing clear product information and patterns.
Electronic and electrical products packaging carton: packaging carton for printing electronic and electrical products, high printing quality requirements, need to accurately print product model, brand identity, use instructions and other graphic information.
Daily necessities packaging boxes: such as cosmetics, household goods and other packaging boxes, pay attention to the beauty of printing and color expression, in order to attract the attention of consumers.
Logistics express cartons: A large number of carton printing used in the logistics and express industry requires fast and efficient printing production, while ensuring the robustness and clarity of the printing so that the information is complete during transportation.
5. FAQ
Q: What if the printed text is blurred?
A: First check the plate to see if there is wear, dirt or improper installation. If the plate is faulty, reinstall or replace it. Secondly, check whether the roller is blocked and can be cleaned with a special cleaning solution. At the same time, check the pressure between the embossing cylinder and the plate cylinder, improper pressure will lead to incomplete ink transfer, and the pressure should be adjusted according to the thickness and material of the carton.
Q: What is the cause of uneven printing color?
A: The ink supply may be uneven. Check whether the ink pump is working normally, whether the ink pipeline is blocked, to ensure that the ink can be evenly transmitted to the roller. The serious wear of the roller will also affect the uniform distribution of the ink, and it needs to be replaced in time. In addition, the drying system temperature and wind speed is not uniform will make different parts of the ink drying speed is inconsistent, resulting in uneven color, to check the drying system of hot air circulation or UV lamp irradiation is normal.
Q: How to solve multi-color printing overprinting?
A: It may be transmission error or tension instability between printing units. Check the transmission gear, chain and other parts are worn or loose, if there is a problem need to repair or replace. Recalibrate the registration system, if there is an automatic registration device can be adjusted through the operation panel. Also check the carton tension control system to ensure that the tension is stable and avoid the carton position deviation during printing.
Q: Why is the printing machine suddenly stopped during operation?
A: It may be a fault alarm. View fault information on the control system display. Common causes include motor overload, sensor failure, low ink level, abnormal carton tension, etc. If the motor is overloaded, check whether the motor is stuck or the load is too large, such as the printing unit pressure is too large. The sensor is faulty. Check whether the sensor is damaged or blocked. If the ink level is low, add ink, and if the tension is abnormal, check the tension control system and the carton conveying.
Q: Why can't the printing speed be improved?
A: First, the ink drying speed problem, improve the speed if the ink can not dry in time will affect the quality, need to adjust the drying system parameters or change the drying fast ink. The second is the carton tension control system, the tension should be more stable at high speed, otherwise the carton shake affects the printing. In addition, the dynamic balance and mechanical stability of the printing unit drum are very important, and the high-speed rotating vibration of the drum will limit the speed improvement.
