After checking the file, you can print the final PS file to the special file generated by the FlexRIP/C or SparkRIP software for engraving. When printing the PS file, pay attention to select the PPD file corresponding to the CDI machine model, and set the angle and line number of each color plate according to the flexographic printing process. According to the current configuration of domestic flexo printing equipment, the most commonly used plate lines are 150 lines, and the four-color mode is arranged at: C: 67.50, M: 37.50, Y: 82.50, K: 7.50. Special jobs only need to adjust the individual color version slightly.
In order to avoid manual keyboard input errors during the layout, the above-mentioned commonly used angles and lines of flexo printing may be preset in the PPD file. After the issued PS file is interpreted by FlexRIP/C or SparkRIP, a Len file dedicated to the CDI engraving system is generated. Each Len file is a color separation version of the job. The format of the file can be checked by ESKO Graphics's ShowCT or View-specific inspection software. The ShowCT or View software has a powerful function to check the size of the laser engraving job and its various parts. , Resolving power, buckles, lines, angles, etc. The biggest feature of this software is that it is combined with the DGC software of ESK0-Graphics, which makes it easy to quantify and control the dot size under various network dot percentages, and the quantification and control are all on the computer. Complete, without the need to repeatedly borrow expensive laser media measurement and control, which is difficult for ordinary RIP software.
For example, the DPU45 laser version has 150 squares of 1% circular dots occupying 13 squares at a resolution of 2540dpi. This value is equal to the 1% dots (19m in diameter) firmly secured on the plate after the finished version is finished. ). Then, 11 to 12 squares may be 0.9% outlets, and 10 or less squares are outlets below 0.9%. In the actual plate making and printing, 1% or less of the dots of 0.9% to 0% cannot be either carved out, or printed on the plate may not be printed, and it is easy to cause the printing products to be dirty. Therefore, we should avoid the appearance of less than 1% of dots on the printing plate as much as possible, and even less than 2% of dots must be avoided during actual prepress processing. We can use the above ShowCT to check whether there are any dots less than 2% or 1% on the file and correct it in advance. Others such as file size, line number, angle, and resolution can also be checked under the corresponding menu.
Next, the Len file is ready for engraving on the Grapholas NT system for SKO-Graphics laser engraving. In order to save material and energy, the documents of the same type of plate are usually assembled and then engraved. This part of the work is done by Merge and EXPOSE. When engraving, pay attention to the type and engraving parameters of the plate material can not be confused, different plate plough number has different parameters, of course, for the use of single-sided exposure machine plate factory, in the previous edition must be done before the engraving The laser-engraved version must be immediately exposed to the main exposure, because the sensitivity and sensitivity of the laser-based material are relatively good. The ablated laser version of the laser plate, especially in the field, is afraid of dust, hair, and fiber. This also means that The environmental control of the laser room is equally important.
The laser version that has already done the main exposure is going through a series of processes such as washing and drying and post-processing. It is necessary to use fresh wash water at the time of washing, while controlling the technical parameters related to washing. Drying temperature is best controlled at 60 °C, the oven should have good air circulation in order to facilitate solvent evaporation on the plate, the use of environmentally friendly syrup drying time is controlled at about 3 hours, non-environmental medicine is about 2 hours . After drying, the printing plate should be allowed to cool for a certain period of time before it can be post-treated. Inappropriate processing time can cause poor printing ink, cracks, and low resistance to printing. It is recommended that the operator perform systematic tests on the parameters of the relevant technology in the process flow at intervals to ensure the quality of the printing plate.