Printing Plate Characterization for Waste-Free Press Register Setup
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Solution Overview
Problem
Existing methods for setting pressure and register in flexographic printing presses require manual adjustments, generate waste, and are dependent on operator skill, lacking a fully automated solution that minimizes waste and ensures precise alignment without separate scanning.
Innovation Solution
Implement non-contact plate and anilox sensors on the press to measure distances and adjust positions automatically, using self-mixing interferometry (SMI) or relief profile sensors to characterize the printing plate and anilox roller configurations, enabling precise pressure and register settings without printing or additional scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual adjustments are used for setting pressure and register, then operator flexibility is maintained, but precision and consistency deteriorate due to operator skill dependency
Solution Approach 1:
The patent replaces manual mechanical adjustment systems with an automated sensor-based measurement and control system. Non-contact sensors (optical, capacitive, or inductive) automatically measure plate thickness, anilox roller dimensions, and cylinder positions, eliminating the need for manual gauges and operator judgment. The system computes optimal pressure and register settings algorithmically and actuates cylinders automatically, substituting the entire manual mechanical adjustment process with an automated electromechanical system.
Solution Approach 2:
The system enables the printing press to self-characterize its components by automatically measuring plate thickness, anilox roller circumference, and cylinder geometry without external intervention. The press performs self-diagnosis and self-adjustment by comparing measured dimensions against target specifications and automatically modifying pressure and register settings to compensate for manufacturing tolerances and wear, making the system self-sufficient without requiring operator skill.
2Measurement precision
If separate scanning of plate and anilox is performed, then detailed characterization is achieved, but time and complexity increase
Solution Approach 1:
The patent combines multiple measurement functions into a single integrated system. Non-contact sensors simultaneously measure plate thickness, anilox roller circumference, and cylinder positions in one setup procedure. The system merges characterization of multiple components (plate, anilox, cylinders) into a unified measurement and control process, eliminating the need for separate scanning operations for each component.
Solution Approach 2:
The measurement system is designed with universal multi-functionality to characterize different components using the same sensor platform. The non-contact sensors can measure various geometries (flat plates, cylindrical rollers, rotating cylinders) and the control system adapts algorithms to handle different measurement modes, making a single system capable of performing multiple characterization tasks without requiring separate specialized scanning equipment.
3Measurement precision
If non-contact sensors are used for plate measurement, then measurement accuracy improves, but system complexity increases
Solution Approach 1:
The patent replaces complex mechanical contact measurement systems with non-contact optical, capacitive, or inductive sensors. These sensors measure plate thickness, cylinder positions, and anilox dimensions without physical contact, eliminating the need for mechanical probes, gauges, and contact-based measurement mechanisms. The substitution reduces mechanical complexity while maintaining or improving measurement accuracy through field-based sensing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Achieves precise pressure and register settings without waste, ensuring accurate ink transfer and image quality, eliminating the need for manual adjustments and separate scanning, and reducing operational costs.
Implementation Method 1
The non-contact plate sensor may include a self-mixing interferometry (SMI) sensor or a relief profile sensor.
Implementation Method 2
A laser is used to measure the distance to the top and bottom surfaces of a printing plate by detecting reflected light.
Data Source
AI summary
A system including a non-contact plate sensor and a processor configured to characterize a configuration of a plate based upon information received from the sensor, such as position on a press or plate quality. The processor is configured to initiate a responsive action based upon the characterized configuration. A related method includes setting pressure of a printing plate relative to an ink-receiving substrate and register of a printing plate relative to another printing plate on a press, without generating printed waste. The non-contact plate sensor measures a distance of the printing surface of the plate relative to the sensor in locations along the plate longitudinal axis to characterize a starting configuration of the plate. The plate longitudinal axis is adjusted to correspond with a desired position of the plate for exerting a desired pressure on the substrate, based upon a difference between the measured starting position and the desired position.