Combined Printing Press Magnetic Ink Orientation
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Solution Overview
Problem
Current printing technologies for security documents, such as banknotes, face challenges in effectively integrating optically-variable ink with magnetic orientation and drying/curing processes, particularly in ensuring proper induction and stabilization of optically-variable effects before subsequent intaglio printing steps.
Innovation Solution
A combined printing press is designed with a screen printing group that applies optically-variable ink containing flakes, followed by a magnetic unit to induce optical effects and a drying/curing unit, utilizing a rotating magnetic cylinder assembly and UV-LED curing units to ensure ink drying and curing before transferring substrates to the intaglio printing group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the screen printing group applies optically-variable ink and the magnetic unit induces optical effects, then the security features are enhanced, but the ink may not be properly dried or cured before intaglio printing, causing quality issues
Solution Approach 1:
The patent combines the magnetic unit and drying/curing unit into a single integrated assembly. The magnetic cylinder assembly and drying/curing cylinder are positioned to cooperate simultaneously, allowing magnetic induction and ink curing to occur in the same operational zone without requiring separate processing steps, thereby ensuring both security feature enhancement and proper ink drying quality
Solution Approach 2:
The drying/curing unit is positioned to initiate drying/curing of the ink pattern before the substrate is taken away from the magnetic cylinder assembly. This preliminary action ensures the ink is properly stabilized before subsequent intaglio printing, preventing quality issues while maintaining the security features
2Manufacturing precision
If a separate drying/curing unit is added after the magnetic unit, then ink curing is improved, but the device complexity increases
Solution Approach 1:
Rather than adding a completely separate drying/curing unit after the magnetic unit, the patent merges both functions into a single integrated assembly where the magnetic cylinder assembly and drying/curing cylinder cooperate in the same operational zone. This reduces device complexity by eliminating the need for separate processing stations while still achieving proper ink curing quality
Solution Approach 2:
The integrated assembly serves multiple functions simultaneously: the magnetic cylinder assembly induces optical effects in the ink while the drying/curing cylinder cures the ink pattern. This multi-functionality reduces the overall number of components required in the printing press while maintaining high ink curing quality
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 configuration ensures the precise induction and stabilization of optically-variable effects in the ink, enhancing the security features of printed documents by ensuring the ink patterns are properly dried and cured before intaglio printing, thereby improving the overall quality and security of the printed substrates.
Implementation Method 1
The screen printing group comprises a magnetic unit located downstream of the screen printing unit, which magnetic unit is designed to magnetically induce an optically-variable effect in the pattern of optically-variable ink applied by the screen printing unit
Implementation Method 2
The drying/curing unit(s) may advantageously be UV curing units, in particular UV-LED curing units
Data Source
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AI summary
There is described a combined printing press (10; 10*) for the production of security documents, in particular banknotes, comprising a screen printing group (2; 2*) and an intaglio printing group (3)adapted to process substrates in the form of individual sheets or successive portions of a continuous web. The screen printing group (2; 2*) is located upstream of the intaglio printing group (3) and comprises at least one screen printing unit (20; 20*) designed to print a pattern of optically-variable ink onto one side of the substrates, which optically- variable ink contains flakes that can be oriented by means of a magnetic field. The screen printing group (2; 2*) further comprises a magnetic unit (24; 24*) located downstream of the screen printing unit (20; 20*), which magnetic unit is designed to magnetically induce an optically-variable effect in the pattern of optically-variable ink applied by the screen printing unit (20; 20*). The screen printing group (2; 2*) further comprises at least one drying/curing unit (25, 28; 25*, 28*) designed to dry/cure the pattern of optically-variable ink in which the optically-variable effect has been induced by the magnetic unit (24), prior to transfer of the substrates to the intaglio printing group (3).