Using computer to make a plate, especially making a spot color plate, if you are careless, there will often be some problems that do not meet the printing process, resulting in huge losses. The following is an example.
Example A, B, C spot color blocks. A is bronzing (here regarded as a spot color), B is a brown block, and C is a light yellow block.
When designing with Corledraw, we tend to make the A color block a rectangle filled with 100% Y, and the B color block a rectangle filled with 100% Y, C, M, in order to be able to output a solid color plate separately, and the actual printing The color is irrelevant, the color is controlled by spot color ink during actual printing. Then put C as the layer, B as the second layer, and A as the last layer, and put them together. In this way, the blocked area of ​​each layer is automatically hollowed out, and a version with 3 borders just in register and no overprint borders can be made. This is very simple, but it is easy to go wrong when printing. Especially after multiple editions are combined into a large version, the paper is easily deformed due to the large format, and the trailing place will appear white due to inaccurate overprinting; due to heating during bronzing, the paper is more likely to deform and leak white .
How to solve these problems? The answer is trapping. That is, a common overprinting edge is added at the boundary of the two color blocks to make up for the phenomenon that the inaccurate surface of the overprint is white due to paper deformation or other reasons.
So how to make it in Corledraw?
Method 1: Make a separate file for each color version. A color block is made as a separate box according to the actual size; when making the B color block, the outer border is increased by 0.3mm, so as to have a common overprinted edge with the A color block, and a perfect circle is dug out according to the actual size in the middle; A perfect circle, also increased by 0.3mm around, and has a stack of printed edges with the B color block. In this way, 3 files and 3 printing plates are output to avoid the automatic hollowing of layers in a file without the phenomenon of common overlapping edges. When printing, first print the C block, then the B color block, overprint the light color with the dark color, and finally the A color block bronzing, you can avoid white leakage. In doing so, it is troublesome to form several files. And because the color plate is divided into several files, the size of the core is difficult to control during production and RIP processing. Films that are not easy to output will cause overprinting due to different core sizes.
Method two: This file only makes one file. In the same way as above, we can first make 3 color blocks separately. A color block is the first layer, B color block is the second layer, and C color block is the last layer. Finally, select all 3 color blocks, click the right mouse button, and select "Overprint Fill" from the pop-up menu options. After this processing, the blocked "layer" will not be excavated, but will remain as a public overlay. This is a better way. It is also worth noting that when exporting EPS format files, the trap entry should be selected to "maintain document overprint settings."
In addition, in the output center, the RIP processing parameters should also be selected accordingly. Taking Founder Century PSPNT as an example, you should select "Allow users to customize the hollowing parameters", and the graphics hollowing parameters should be "not hollowed", so as to ensure the final output of the printed The version meets the printing process requirements.
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