The most popular view of the difference of soft co

2022-07-23
  • Detail

From the point of view of the structure of the printing press, the difference between the flexographic printing machine and the gravure printing machine

from the point of view of the structure of the printing press, the types and types of the flexographic printing machine and the gravure printing machine are almost the same, with little difference. There are three types of flexographic printing machines, unit type, stacked type and satellite type. It is generally recognized that "satellite type" is the most suitable type for flexible packaging, especially plastic film printing. The reason is that the substrate is close to the surface of the central embossing cylinder, the color spacing is only mm (the flexo ink layer is thin, so it is not afraid of drying), there is almost no displacement during printing, and the overprint is accurate (up to ± 0.05mm). The area where the printing plate contacts the central impression cylinder is regarded as the "round flattening" form. The diameter of the central impression cylinder is generally more than 1200mm, and the maximum can reach more than 3000mm. Although the upper and lower spaces sometimes exchange with each other, the position can be regarded as a plane in the local scope of strengthening the green management level of the whole industry chain

in the case of a satellite gravure press, the same cannot be said, because the surface of the central impression cylinder is covered with a thick layer of rubber, and cooling water is useless. In addition, the gravure printing ink layer is thick, and the group spacing is short, so it cannot be dried. The dryer directly bakes the surface of the large cylinder, and the temperature is the same as that of the dryer in a short time. As a result, the gravure printing roller becomes hot, the fine lines of the small characters dry off, the dry solvent is forced to slow down, and the printing speed is forced to drop. Therefore, the gravure printing machine can also be used in these three forms, which is now recognized as a combined type

0 250kg gravure printing machine adopts combined type. The reason is that the thickness of gravure printing ink layer is not easy to dry, so the "unit type" is used to extend its travel distance, but this brings about the change of film tension and the difficulty of accurate overprint. After long-term improvement, various tension feedback, adjustment control devices (constant tension system) and photoelectric tracking and deviation correction devices have been produced, especially the implementation of electronic shaft transmission. The error response time is reduced to 2ms through non-contact mode, and the feedback is sent to the electronic gear for rapid fine adjustment of the printing plate, thus pushing the combined gravure printing machine to a perfect position

imagine that the printing plate is in close contact with the pressing roller, and the substrate is pressed in the middle. Under the high-speed running state, the pressure tends to decrease, and the rotation of the plate roller will inevitably cause the deformation or sliding of soft materials, thus affecting the printing quality. Gravure printing is undoubtedly slightly better than flexo printing, because gravure plate roller is a rigid structure, deformation is glue pressing; The flexo printing deformation is the printing plate, which directly affects the surface quality. Look at the satellite flexo printing machine. The diameter of the central impression cylinder of the 6-8 color machine is? 800-2500mm, the huge inertia generated by self weight will inevitably bring difficulties in control during startup and shutdown in high-speed operation, so people think of the benefits of unit flexo printing machine

Copyright © 2011 JIN SHI