In-line Casting Device for Micro-optical Structure Replication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The production of security documents like banknotes with micro-optical structures is cumbersome and costly due to the need for separate processes to create these structures, which complicates the printing process and increases costs.
Innovation Solution
A printing press is designed to integrate an in-line casting device that applies a layer of optical medium on the substrate and replicates micro-optical structures, allowing for simultaneous printing with high register accuracy, using a combination of screen-printing and embossing techniques, and optionally including UV-curing units for efficient material application and curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate processes are used to create micro-optical structures, then the structures can be produced, but the production process becomes cumbersome and costly with increased complexity
Solution Approach 1:
The patent combines the micro-optical structure creation process with the printing process by integrating a casting device into the printing press. The casting device applies optical medium and forms micro-optical structures in-line with the printing unit, eliminating the need for separate off-line processes and reducing overall system complexity despite adding manufacturing capability.
Solution Approach 2:
The printing press is transformed into a multi-functional system that simultaneously performs printing and micro-optical structure creation. The casting device integrated into the printing press enables the same equipment to handle both conventional printing tasks and advanced security feature production, reducing the need for separate specialized equipment.
2Manufacturing precision
If separate processes are used to create micro-optical structures, then the structures can be produced, but costs increase
Solution Approach 1:
By merging the casting device with the printing press, the patent eliminates the need for separate production lines and equipment investments. The integration allows simultaneous production of printed documents and micro-optical structures in a single pass, reducing overall manufacturing costs while maintaining high precision.
3Manufacturing precision
If an in-line casting device is integrated into the printing press, then register accuracy between printed patterns and micro-optical structures is improved, but device complexity increases
Solution Approach 1:
The casting device is merged with the printing press structure, sharing common components such as the substrate transport system and positioning mechanisms. This integration ensures that both printing and casting operations occur in-line with the same substrate movement, guaranteeing high register accuracy while avoiding the need for separate complex systems.
Solution Approach 2:
The printing press is upgraded to perform multiple functions including conventional printing, optical medium application, and micro-optical structure formation. By making the press multi-functional, the patent achieves high register accuracy through synchronized operations without requiring entirely separate specialized equipment for each function.
4Device complexity
If micro-optical structure creation is integrated into the printing process, then production complexity is reduced, but machine operability and accessibility may be compromised
Solution Approach 1:
The casting device is designed as a modular unit that can be integrated into the printing press while maintaining independent access and operation. This segmentation allows operators to service and adjust the casting components without shutting down the entire printing press, preserving ease of operation while reducing production process complexity.
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
This solution streamlines the production of security documents by ensuring high register accuracy between printed patterns and micro-optical structures, reducing complexity and cost by integrating the micro-optical structure creation directly into the printing process, while maintaining machine operability and accessibility.
Implementation Method 1
an in-line casting device adapted to apply a layer of material acting as an optical medium on a portion of the first or second side of the substrate and to replicate and form a micro-optical structure in the layer of material acting as optical medium
Implementation Method 2
optionally including UV-curing units for efficient material application and curing
Data Source
AI summary
There is described a printing press adapted to carry out printing on a sheet-like or web-like substrate, in particular for the production of security documents such as banknotes, comprising a substrate feeding device for feeding the substrate to be treated, at least a printing unit designed to print a first side and/or a second side of the substrate and a delivery unit for receiving the treated substrate. The printing press in the conveying path for the substrate between the feeding device and the delivery unit further comprises an in-line casting device adapted to apply a layer of material acting as an optical medium on a portion of the second side of the substrate and to replicate and form a micro-optical structure in the layer of material acting as optical medium, wherein the printing unit comprises a first printing group comprising a printing cylinder and being adapted to print at least one printed pattern on the first or second side of the substrate in register with the micro-optical structure.