Duplex Printing Substrate Deformation Compensation
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Solution Overview
Problem
Existing methods for compensating for printing substrate deformations in duplex printing operations do not adequately account for the deformations that occur on the first side when printing the second side, leading to suboptimal register deviations between color separations.
Innovation Solution
A method that uses automated register correction with image sensors to measure and calculate deformation parameters on the first side, forecasting and compensating for substrate deformations on the second side by incorporating deformation values from previous printing units, and considering substrate turning and pre-treatment effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If substrate deformation compensation is performed only for the current side using prior art methods, then the compensation process is simple, but register accuracy between first side and second side deteriorates
Solution Approach 1:
The patent applies preliminary action by measuring and calculating substrate deformation parameters on the first side before printing the second side. The deformation values from the first side are stored and used as input parameters for compensation calculations on the second side, allowing the system to proactively account for deformations that will affect subsequent printing operations.
Solution Approach 2:
The patent implements feedback by using image sensors to measure register marks and continuously monitor substrate deformation. The measured deformation parameters are fed back into the compensation calculation system, which then adjusts the printing parameters for subsequent color separations and the second side to compensate for the measured deformations.
2Measurement precision
If deformation measurement is performed at every printing unit, then measurement accuracy improves, but measurement time and processing complexity increase
Solution Approach 1:
The patent segments the deformation measurement process by assigning dedicated image sensors to specific printing units where they measure register marks immediately after ink application. This segmentation allows parallel measurement of deformations at multiple printing units simultaneously, reducing total measurement time while maintaining high precision through localized measurement points.
Data Source
AI summary
A method for compensating for printing substrate deformation in a multicolor duplex printing operation by way of a computer. The substrate deformation that arises when individual color separations are printed onto the first and second sides of the printing substrate in the printing units is established and compensated for in the course of an automated register correction process. The computer calculates a forecast of the substrate deformation on a basis of the established first side deformation parameters of the printing substrate. When further color separations are printed onto the second side the forecast is used as an input parameter for a compensation of the substrate deformation of the second side.