Offset Printing Plate Color Separation for Seamless Image Output
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Solution Overview
Problem
Offset printing struggles to produce seamless or transition-free endless and format-variable print images due to limitations in printing form length and non-printing areas, leading to register errors and quality restrictions.
Innovation Solution
Divide the overall separation of each printing color into multiple partial separations, allowing for overlapping or superimposed printing without sharp transitions, with tonal value corrections to compensate for fluctuations, ensuring high-quality seamless printing across sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the overall separation of each printing color is divided into multiple partial separations for printing with multiple printing forms, then seamless or transition-free endless or format-variable printing can be achieved, but register errors occur leading to insufficient printing quality
Solution Approach 1:
The patent divides the overall separation of each printing color into multiple partial separations, with each partial separation being printed by a different printing form. This segmentation allows the printing process to continue seamlessly without requiring a single extremely long printing form, while the overlapping printing of partial separations ensures continuous coverage and eliminates transition edges.
Solution Approach 2:
The patent applies tonal value correction in advance to the partial separations before printing. By pre-calculating and adjusting the tonal values based on the expected degree of overlapping, the system compensates for potential register errors and tonal value fluctuations that would otherwise occur during the printing process, thereby maintaining high printing quality.
2Ease of manufacture
If printing forms with defined length and non-printing areas are used, then the printing process can be simplified, but pressure-free areas remain on the printing material leading to visible transitions
Solution Approach 1:
The patent implements a dynamic printing strategy where multiple printing forms with different partial separations are used in sequence. The system dynamically adjusts which printing form prints which section of the material, with overlapping regions ensuring continuous coverage. This dynamic approach eliminates the static pressure-free areas that would otherwise be visible as transitions.
Solution Approach 2:
By using overlapping partial separations printed by multiple printing forms, the patent ensures continuous printing action without interruption or visible transitions. The overlapping regions create a buffer zone that maintains continuous ink application, eliminating the pressure-free areas that would otherwise appear as transitions in the printed image.
3Adaptability or versatility
If the total separation is divided between at least two printing forms to enable endless printing, then format-variable printing becomes possible, but tonal value fluctuations occur due to superimposition of partial separations
Solution Approach 1:
The patent incorporates a feedback mechanism through tonal value correction. The system calculates the expected degree of overlapping between partial separations and uses this information to adjust the tonal values in advance. This feedback loop ensures that even when partial separations are superimposed during printing, the final tonal values remain consistent and accurate.
Solution Approach 2:
The patent changes the tonal value parameter of the partial separations based on the expected degree of overlapping. By adjusting this parameter in advance, the system compensates for the cumulative effect of multiple ink layers, ensuring that the final printed image maintains consistent tonal values across all sections including the overlapping regions.
Data Source
AI summary
A method for producing printing plates used for printing a substrate web with a seamless, continuous, or variable-format image in offset printing, wherein for each printing color of the image, a total separation of the respective printing color is divided between at least two printing plates, such that a first partial separation of the total separation of the respective printing color can be printed onto the substrate with a first printing plate and a second partial separation of the total separation of the respective printing color with a second printing plate, wherein the total separation of the respective printing color is divided between the partial separations in such a way that the substrate web can be printed in first sections exclusively by the first partial separation of the first printing plate, and that the substrate web can be printed in second sections exclusively by the second partial separation of the second printing plate.and that the substrate web can be printed in third sections overlapping or superimposed by the first partial separation of the first printing form and by the second partial separation of the second printing form.