Flexographic Printing Plate Mounting Using Optical Superposition
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Solution Overview
Problem
Current methods for mounting flexographic printing plates require time-consuming test prints to ensure precise alignment, which hampers production rates and is inefficient.
Innovation Solution
A machine with a virtual data-processing system using a movable television camera connected to a monitor for real-time image comparison between a preprocessed graphical reproduction and the actual printing plate image, allowing precise positioning without test prints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional alignment methods with reference markings are used, then mounting precision can be achieved, but mounting time increases significantly
Solution Approach 1:
The patent uses optical copying through a television camera system to capture the printing plate image and superimpose it with the reference image. This allows the operator to compare positions visually without physical test prints, achieving both precision and time efficiency by eliminating the need for actual printing tests to verify alignment.
Solution Approach 2:
The patent replaces the mechanical test print process with an optical-electronic system. Instead of physically printing and comparing, the system uses a television camera to capture images and electronically superimposes them for comparison, substituting mechanical operations with optical and electronic processes to reduce time while maintaining precision.
2Measurement precision
If test prints are performed to check mounting position, then alignment accuracy is verified, but production rate decreases
Solution Approach 1:
The patent performs preliminary action by pre-processing the reference image and having it ready for superposition. The reference image is prepared in advance and stored, allowing the operator to immediately compare it with the printing plate image without needing to perform test prints during the mounting process, thus verifying alignment accuracy without reducing production rate.
Solution Approach 2:
The patent creates an optical copy of the printing plate image through the television camera and superimposes it with the pre-processed reference image. This copying method allows for immediate visual verification of alignment accuracy without requiring physical test prints, thereby maintaining high production rates while ensuring measurement precision.
3Reliability
If multiple test prints are performed for each cylinder, then mounting correctness is confirmed, but operating time increases
Solution Approach 1:
The patent uses optical copying to create a visual representation of the printing plate image and superimposes it with the reference image. This allows the operator to verify mounting correctness by visual comparison alone, eliminating the need for multiple physical test prints and significantly reducing operating time while maintaining reliability.
Solution Approach 2:
The patent substitutes the mechanical test print process with an optical-electronic verification system. The television camera captures the printing plate image, and the electronic superposition with the reference image provides immediate feedback on mounting correctness, replacing time-consuming mechanical printing operations with rapid optical measurement.
Data Source
AI summary
A machine for in-register mounting of flexographic printing plates with a virtual data-processing system, having a supporting footing for a printing plate cylinder, on which a respective flexographic printing plate is mounted, suitable for printing a predefined image, and at least one television camera, which is connected to a monitor, is trained onto the cylinder and can slide parallel to the cylinder to check correct positioning-mounting of the printing plate, the television camera being associated with position sensors and connected to a device for the real-time processing and display of at least one composite image, for allowing the operator to perform precise position comparisons for optimum plate mounting between a preprocessed graphical reproduction of the image to be printed, provided on a digital memory composed of graphical memory associated with position measurements, and the position of the printing plate.