As we all know, the CTP process can bring many benefits to printing: excellent imaging quality, near-perfect calibration, and rapid production turnaround. However, its various advantages are not only due to the imaging equipment, but also depend on the quality and performance of the CTP plate.
Here we will focus on discussing several characteristics of plate materials and see how they interact to assist CTP equipment in digital plate making, which affects the image quality. This applies to all CTP plates, but is particularly suitable for thermal plates. At present, the use of global thermal plates has increased dramatically, and it has also been recognized as the first choice for high-quality lithography.
Requirements for aluminum base
In traditional plate making, whether the dots can be accurately positioned on the plate material depends largely on whether the positions of the imposition and positioning register devices are accurate when using a vacuum device or a continuous copying device. In any case, this requires the plate to be fairly flat when placed flat, but because the imaging process uses direct contact exposure, the entire process can accept different flatness changes of various types of plate surfaces, and the flatness change of these surfaces is caused by It is caused by aluminum-based surface treatment when producing traditional plates. However, because the digital printing plate is exposed with the energy focused by the laser light source, the requirements for the flatness of the digital plate, including the aluminum-based surface treatment, are more stringent.
In addition, the use of energy focusing imaging is different from direct imaging, which means that there will be no visible stripes when imaging on digital plates, because there will be no stripes when anodizing and grinding the aluminum plate.
Coating
When the photosensitive emulsion is coated on the digital plate, it 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 of the reel, no matter how small, falls on the plate, will cause this artificial image point. In fact, irregular images are also produced due to static spots, and they are so small that they cannot be seen even with a magnifying glass that checks traditional printing plates.
The same uniformity requirements are also applied to the photosensitive coating of digital printing plate composite materials. Generally speaking: when the traditional printing plate material is exposed to ultraviolet light, the energy it receives is about 10,000 times the energy transferred by the laser system to the digital printing plate coating in the direct plate-making equipment. That is to say, in order to accurately meet the physical characteristics mentioned above, the emulsion coating of digital printing plates must be very strict to achieve a specific range of spectral sensitivity characteristics, and be a synthetic substance (especially the molecular structure in the coating), And react actively to energy. Therefore, factories that produce digital printing plates require special, additional chemical agents, as well as special production workflows.
Operating requirements
Compared with traditional plates, CTP plates also require different operation methods during handling. Because many digital plate imaging uses the edge of the plate as the key reference point for calculating the imaging position. Digital plates have very strict requirements on the straightness and uniformity of the edges. Although this is only a small problem for traditional plates, if the edges of the digital plates are not straight, unusual or damaged, the plates will not work properly.
service
The final step in digital plate production is to create and maintain a service team that can help printers solve problems whenever problems arise in any location. This is something that should be considered when evaluating any traditional and digital plates, but it is especially important for digital plates. Because the general printers that use CTP production are due to customers have particularly strict time limits, which means that as soon as problems occur, they 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 pile of plates sent to the printing shop but a print produced by the accurate imaging of the plates on the printing machine. Goods.
When considering the cost of producing digital plates, several important factors whose cost is higher than traditional plates should be considered. The most important point is the demand for high-quality raw materials. Thermal technology is the preferred technology for printers to adopt the CTP system. Thermal plates will bring users precise quality and stable high quality. â—Ž
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