The effect of digital media on CTP performance
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As we all know, the CTP process can bring many benefits to printing: excellent image quality, near-perfect calibration, and rapid production turnover. However, its various advantages are not only due to the imaging equipment, but also to the quality and performance of the CTP plate.
Here we will focus on several characteristics of the plate, see how they interact to assist the CTP device for digital plate making, thus affecting the image quality. This applies to all CTP plates, but is especially suitable for thermal plates. At present, the global use of thermal plates has increased dramatically and has been recognized as the preferred plate for high quality lithography.
Aluminum base requirements
In conventional plate making, whether the dots can be accurately positioned on the plate depends largely on the accuracy of the position of the imposition and positioning register when using the vacuuming device or the continuous copying device. In any case, this requires the plate to be fairly flat when laid flat, but because the imaging process uses direct contact exposure, the entire process can accept different flatness changes on the surface of various types of plates, and the flatness of these surfaces is changed by Caused by the surface treatment of aluminum based on the production of traditional plates. However, because the digital printing plate is exposed by the energy focused by the laser source, the requirements for the flatness of the digital plate, including the aluminum surface treatment, are more stringent.
In addition, the use of energy-focus imaging differs from direct imaging in that it means that there are no visible streaks when imaged on a digital media because there is no streaking in the anodization and graining process of the aluminum plate.
Coating
When applied to a digital plate, the emulsion must be smooth, uniform, and free of defects. Because the size of the dots generated on the laser plate-making machine is very small, any dust in the air during the production process of the reel, no matter how small, falls on the plate, which will result in this personal image point. In fact, irregular images are also generated due to electrostatic spots, and they are very small and cannot be seen even with magnifying glasses that check conventional printing plates.
The same uniformity requirements are also applied in the photosensitive coating of digital printing plate composite materials. In general: When a conventional printing plate is exposed to ultraviolet light, it receives about 10,000 times more energy than the laser system transfers to the digital printing plate coating in a direct plate making machine. That is to say, in order to accurately meet the physical properties mentioned above, the emulsion coating of the digital printing plate material is very strict to achieve a specific range of spectral sensitization characteristics, which is a synthetic substance (especially a molecular structure in a coating). And active in energy. Therefore, factories producing digital printing plates require special, additional chemicals and special production workflows.
Operational requirements
Compared with traditional plates, CTP plates require different modes of operation during handling. Because many digital media imaging uses the edge of the plate as a key reference point for calculating the imaging position. Digital plates have very strict requirements on edge straightness and uniformity. Although this is only a minor issue for traditional media, if the edge of the digital plate is not straight, unusual or damaged, the plate will not work properly.
service
The final step in the production of digital media is to create and maintain a service team that can help printers solve problems whenever problems arise anywhere. This is a question that should be considered when evaluating any traditional and digital media, but it is especially important for digital media. Because printers that typically use CTP are manufactured because of the extremely strict time constraints of the customer, this means that as soon as a problem occurs, it must be resolved immediately.
to sum up
When comparing different digital plates or plate making systems, it is worth noting that the final product is not a stack of plates sent to the pressroom but is printed by the unfinished printing of the precisely imaged plates on the press. Product.
When considering the cost of producing digital plates, consideration should be given to several important factors that are more expensive than traditional plates. The most important point is the demand for high quality raw materials. Thermal technology is the technology of choice for printers using CTP systems, which provide users with precise quality and consistently high quality.