Hot / cold UV curing technology In recent years, a new technology that has been applied successfully in the flexo industry is UV (ultraviolet) / EB (electron beam) curing technology. This new curing technology has played a crucial role in improving the quality of flexo products. Important role. We know that UVFlexo is widely used abroad, and its development and promotion in China is also very rapid, which can be described as the most influential technological innovation in the flexo industry. The components of ink or alcoholic ink include: toner, resin, amine, surfactant, solvent, etc .; and UV-curable ink contains toner, resin, surfactant, photoinitiator, diluent (a reaction form) Body, non-volatile). We can see the difference between UV ink and water-based ink. UV ink is bright in color, almost 100% solid content, non-volatile, and only cured when it encounters ultraviolet light with a certain wavelength and sufficient power. This short process of changing from liquid to solid is called solidification. It is different from drying. Drying refers to the process in which the volatile solvents (water, alcohol) contained in the ink evaporate from the ink under the action of the outside world (heat, infrared, etc.), and the remaining part slowly becomes solid. The UV light source used in the flexo printing machine is an ultraviolet curing system, which is generally composed of three parts: a light box (lamp, mirror, etc.) power controller and operation panel. When the high-voltage electricity passes through the UV lamp, the lamp tube will emit ultraviolet light, infrared light, visible light and so on. Generally, the temperature of the UV lamp tube will be very high during operation, which will cause the film material to shrink and affect the accuracy of the overprint. It is particularly unsuitable for some heat-sensitive materials, so the cold UV technology came into being. Cold UV uses a dichroic mirror, which can reflect ultraviolet light and absorb infrared (heat), in addition, a transparent cooling plate is added between the light source and the substrate. Cold UV technology can reduce heat by up to 80%, ensuring that the surface temperature of the substrate does not exceed 45 degrees. The cold UV technology not only solves the problem of ink adhesion, but also avoids the problem of overprint accuracy caused by the thermal shrinkage of the film material. EB curing technology is similar to ultraviolet curing, and the ink is cured quickly after being irradiated with a certain degree of electron beam. Due to the high application cost of EB curing, it has not yet been widely popularized. Quick replacement technology The rapid replacement technology referred to here has been extended to include rapid replacement of ink and anilox rollers, rapid replacement of printing plates, impression cylinders, and die cutters. Using rapid replacement technology can greatly shorten the time required for each process link, minimize the downtime preparation time, and improve the utilization efficiency of the machine. Quickly replace the anilox roller and ink cleaning technology. Generally, a drawer structure is used to pull out the anilox roller and the ink tray together. Remove the anilox roller. After cleaning the ink roller and the ink tray, you can put a new anilox Roller and ink. AQUAFLEX flexo printing machine, while pulling out the drawer, the motor that independently drives the anilox roller does not stop working, which can prevent the ink from drying on the anilox roller. Quick change of printing plate refers to the rapid replacement of printing plate after completing an order under the same size of plate cylinder but different plate. Generally, for a limited number of plate cylinders, a thin sleeve (1mm) can be used with Inflatable drum core structure. During the printing of the previous order, the printing plate of the latter order has been pasted onto the sleeve outside the line. When changing, each color printing plate only needs two or three minutes. This new technology for rapid plate change is particularly convenient for printed items (cigarette packs, beer labels) with fixed dimensions and varying patterns. The rapid replacement of the impression cylinder technology is to increase the printing range of the flexo printing machine, which can not only introduce film, but also print paper and thick paper. In the past, replacing a set of impression cylinders was quite troublesome. With the rapid replacement technology, it is only necessary to remove a few screws to remove one impression cylinder, and it takes only half an hour to replace a whole set of impression cylinders. In terms of rapid replacement of die-cutting tools, it is said that Chromas uses in-line laser die-cutting technology, which can transfer the data entered in advance and execute it, which can complete the replacement work, which is convenient and fast. At present, this technology has been successfully applied to the processing of self-adhesive labels. Shaftless drive and servo drive technology For the unit-type flexo printing machine, perhaps everyone is familiar with a long, segmented main drive shaft behind the machine. When the number of printing units is increasing or the width is increasing a lot, the main transmission shaft will inevitably produce large distortion due to the increase of load, which will seriously affect the accuracy of multi-color overprinting. With the rapid development of motor and control technology, shaftless transmission and servo drive have become possible. The independent printing unit is driven by a separate motor to ensure that the relative position of the plate cylinder of each unit is accurate, and to ensure that the tension of the whole machine is stable. Thereby improving the overprint accuracy of multi-color printing and avoiding the "ink stick" phenomenon caused by vibration. In addition, the range of printing paper for each machine will be further expanded, from film to thick cardboard. The servo drive technology can also expand the application range of the flexo printing machine, such as repeat printing length, the first unit can print the first 450mm of the required repeat length 900mm, and the second unit can print the remaining 450mm. PLC control and remote diagnosis service system The convenient man-machine interface and menu-type commands make the control faster and more efficient. Once the machine breaks down, the system displays the error information in time, instructs the operator or maintenance personnel to find the fault point as soon as possible, and can eliminate the fault as quickly as possible and reduce downtime. For serious faults, the operator can also use the remote diagnosis service to consult with the machine manufacturer to allow them to provide timely service. Other technologies In addition to the new technologies mentioned above, there are many other new technologies that are used on different flexo printing machines. They are: sleeve technology (fast and convenient replacement, simple operation), anilox rollers and laser engraved seamless rubber rollers generally use sleeve technology; inline digital printing technology (application of digital printing technology on flexo printing machines, both Do dot printing, or monochromatic text pattern printing); on-line coating (including cold coating, hot coating, UV adhesive coating), on-line cold bronzing, inkjet, etc. The satellite-type flexo printing machine also uses a more efficient drying system to improve the drying of the color room and the final drying effect, and uses an automatic ink washing system to save manpower. From the introduction of the above new technologies, we can see that the major equipment manufacturers have racked their brains and constantly introduced various new technologies and new processes. Their ultimate purpose is nothing more than to reduce costs, improve flexo quality, reduce downtime and Production efficiency, reducing unnecessary waste, etc. Only in this way can equipment manufacturers be invincible in the fierce competition, and flexo printers can get better quality and lower cost products, and the entire flexo industry can continue Constantly develop. It can be said that technological progress has made our dreams come true! Orbital Ring Wrapper,Ring Stretch Wrapper,High Speed Ring Wrapper,Orbital Wrapper for Reel Shandong Sinolion Machinery Corp., Ltd. , https://www.sinolion.cc