See flexographic direct plate making technology
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Printing technology is slowly shifting from traditional analog printing to digital printing. Flexo printing is no exception. With the advancement of flexographic printing technology, flexographic platemaking technology has also been transformed from analog to digital. At the Asian International Label Exhibition recently, the eye-catching "CDI" on the Esko booth attracted many people's attention. Today, when offset printing dominates most of the printing market, almost everyone knows CTP (Computer to Plate), then what is CDI?
The full text of CDI is Cyrel Digital Imager, a flexographic digital direct platesetter. We can learn about the differences between flexographic digital direct plate making and traditional plate making processes through the process flow chart provided by Esko.
Traditional flexographic direct plate making technology:
Process flow: (Generally used photosensitive resin version)
1) Back exposure: establish a embossed basis of the printing plate by short exposure;
2) Main exposure: the main exposure is performed by the original negative film, and the image space on the negative film is transferred to the plate material, and the photosensitive resin of the plate material is photopolymerized by UV light to be solidified;
3) Rinse: remove the resin from the unexposed area to form a printed relief image;
4) Drying: hot air drying, discharging the solvent absorbed in the plate material, and restoring the original thickness of the plate material;
5) Debonding: to remove the viscosity of the surface of the plate;
6) Post-exposure: The printing plate is thoroughly polymerized to fully harden the plate to the required hardness.
Digital direct plate making technology:
The process is briefly described as a process:
1) Imaging: Place the plate in CDI (Cyrel Digital Imager) and transfer the graphic information to the plate by laser;
2) Main exposure: After laser imaging, the plate is taken out from CDI and placed in a traditional exposure machine for main exposure; like traditional plate-making technology, digital direct plate-making technology also requires flushing, drying, de-bonding and post-exposure.
The difference between the plates used in digital direct plate making, the plate for digital direct plate making is a composite of a black material with complete shading properties on the surface of the photosensitive resin, which is more comparable to other traditional flexible plates. Small dots, clearer graphics and smaller dots increase. The CDI is an external cylindrical reservoir that is imaged on the black surface layer in conjunction with the infrared light from the laser output. By computer control, the laser in the CDI only ablate the black layer to expose the photosensitive resin without affecting the underlying photosensitive resin layer, creating conditions for exposure.
It can be seen that the process is the same as the traditional plate making process except that the plate and digital imaging used are different from the traditional plate making. But it is these two points that make digital direct plate-making technology, with the technical advantages that traditional plate making cannot replicate:
1. In the digital direct plate making technology, the black material on the plate material is used instead of the film, which eliminates the problem of dot enlargement caused on the film during the dot reduction process;
2. Avoiding the vacuum leakage caused by poor contact between the film and the plate during the exposure process;
3. In the traditional plate making process, the exposure time is determined by the type of graphic, and a test is required to determine the exposure time before the official exposure. In digital plate making, the exposure time is independent of the graphic type and dot density;
4. During exposure, the diffuse scattering effect of UV light is formed by the action of the film, so that all the images and dots are enlarged.
The laser, which is applied to the printing and plate-making technology, greatly improves the printing quality and simplifies the process. With the growing maturity and promotion of flexographic digital direct platemaking technology, we have reason to believe that "CDI" will also be sought after.