High-precision flexographic printing press improves the competitiveness of printing companies

In the past two years and when the printing industry peers discussed flexographic printing, some peers proposed that flexographic printing could not keep up with offset printing and gravure printing. Flexographic printing was only suitable for printing common products with low quality requirements, and listed many flexographic versions. Bad example for printing. In the face of this situation, I will come up with several proofs printed by Omet Flexo printing presses, asking them to carefully compare dot-levels, large-area fields, and so on. After physical comparison, we will generally recognize the quality of flexographic printing. The quality of flexographic printing is very close to that of offset or gravure, with no obvious difference.

The improvement of the quality of flexographic printing has benefited from the use of CDI direct plate making technology before printing, as well as the improvement and progress of flexible plate printing related supporting materials (such as resin plates, stickers, inks, etc.). The more crucial factor is flexibility. The printing press has greatly improved its printing accuracy. From the point of view of printing production, we will see how Omega flexographic printing presses can enhance the competitiveness of enterprises by improving the printing quality and reducing the production cost.

High quality is the most effective means for printing companies to win customers. The high-quality printing must first meet a good level of reduction, requiring that the high-light portion of the printed material not lose dots, dark tone is not pasted, the middle tone level is full, and the inspection of the network points with a magnifying glass is not strong, and high-quality printing requires a large area of ​​ink to be printed. No significant ink bars, no significant color difference between print batches. Omit flexo printing press adopts the non-shaft transmission technology and high standard mechanical manufacturing precision, which provides a solid guarantee for high quality printing. Taking the VF type shaftless drive flexo printing machine as an example, this machine cancels the traditional transmission shaft. The gear roller is not used between the printing roller and the impression cylinder of each color group. It is directly driven by an independent motor and avoids gear transmission. The printing quality problems such as ink bars and poor ink transfer have improved printing accuracy. Omidflex's design emphasizes the stability of the structure. It adopts a sturdy frame design and 3mm-thick nickel steel wallboard to ensure that all running parts are free from jumps, so that the small dots can be clearly restored, and there is no ink bar in the field. The effect is fine.

Reducing the material loss in the printing production process is an effective means to reduce the production cost of the company. We have found that poor print overprinting is a major cause of rejects during the print production process. Improving the overprint accuracy of flexographic printing presses will help companies reduce production costs and increase their competitiveness. In the aspect of overprint quality control, due to the use of web materials, the overprint principle of the flexographic printing press is different from that of the sheet-fed printing press in terms of front regulation and side regulation. The overprint of “regulation” of the flexographic printing press is changed and the quality of the overprint is affected. The influence of many factors, the most important thing is the change of material tension. How to ensure a stable tension? Take the Omit VF type shaftless flexible printing press as an example to analyze. In the design of the tension control system, the tensions of the unwinding, feeding, printing die-cutting and winding of the entire production line are separately controlled and do not interfere with each other. In the tension control, the use of shaftless transmission technology, pull roller no longer take power from the drive shaft, instead of directly driven by a high-sensitivity motor, combined with two-stage tension floating roller, to ensure that the entire tension is very smooth, even if the machine is in plus During the deceleration of the speed change process, the problem of overprint due to tension variation rarely occurs. In addition, unlike traditional printing presses, overprint adjustment is not the use of mechanical transmission methods, but the direct adjustment of the roller motor, not only the high accuracy of overprinting, but also overprinting time is short. This kind of structure can also use the automatic pre-registration function, that is, after the plate roller is installed, it only needs to go through a paper path, and accurate registration can be achieved, which reduces waste of paper during reloading and changing. At the Omit VF public demonstration held recently by the Hubei Golden Three Gorges Printing Press, the high sensitivity of the pre-registration and automatic registration systems won unanimous praise.

In terms of follow-up maintenance of equipments concerned by enterprises, there is a relative reduction in the number of shaft-less equipment during technological transformation and technology upgrade, and the operation of the equipment is easy, and the amount of equipment maintenance work is reduced.

High-precision printing and printing sometimes can not play a special role. For example, in the prepress production, some designs with high printing requirements can be intentionally created. Enterprises can use the high-precision printing equipment owned by them not only to play a role in anti-counterfeiting (informal companies can't produce them, or even lose them if they make them). High cost, but also conducive to printing companies to protect their own high-end market.

Reprinted from: "Printing Technology"