In the production process of printed products, when the imposition is not correct due to the problems in the plate-making process, or the overprint of the layout caused by the printing deformation is inaccurate, it is necessary to make slight adjustments to a certain position of the printing plate, and to the inaccurate layout of the film. Make adjustments to meet the requirements of printing registration. However, it is necessary to accurately adjust the micro position of the outline of a certain layout in the film. It is not ideal to adjust the layout position by visual inspection. In particular, the micro-adjustment of the layout position is difficult to be noticed by the naked eye due to the inaccuracy of the outline of the graphics and text after the two-color film is superimposed, and it is easy to cause inaccurate adjustment. For example, if you want to shift a certain position by 0.2mm to the left, the result will be inaccurate due to visual errors.
In order to overcome this problem, we use the "scratch method" for the two-layer laminated film (the bottom layer is a transparent film base) to achieve the effect of quickly and accurately adjusting the position of the negative film. Specific method: the middle part of the four sides of the film to be shifted, use a sharp knife to draw a linear thin line mark with a length of about 6mm, and the line mark should be extended to the base surface of the bottom film. In this way, the film to be adjusted has a position mark on the film base, so no matter which direction is used to adjust the micro displacement, as long as the relative position of the film scratch and the film base scratch is seen, the film can be adjusted quickly and accurately Base position.
The adjustment of the film position is based on the results of printing overprint proofing, that is, according to the actual printing overprint, determine which color plate and which version of the small plate position are adjusted, which way, and how much. With scratch marks on the film and film base, the accuracy of the adjustment amount is reliably guaranteed. In the production process, many companies need to shift the position of the negative film or the printing deformation, and use the "score method" to adjust, which has received good results.
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