Magnetic Belt Orienting Device for Optical Effect Layer Production
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Solution Overview
Problem
Current printing devices for magnetically induced optical effect layers face limitations in high-speed production and dimensional constraints, particularly in achieving sufficient contact time with magnetic elements without using conventional cylindrical bodies, while also offering flexibility in coating compositions and printing processes.
Innovation Solution
A printing device comprising an orienting device with a magnetic or non-magnetic belt driven by rollers, which generates a magnetic field to orient magnetic or magnetizable pigment particles, combined with a hardening unit to fix their orientation, allowing for increased exposure time and flexibility in coating compositions and printing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional cylindrical bodies with cavities are used for magnetic elements, then the device structure is well-defined, but the contact time between magnetic elements and coating composition is insufficient for high-speed production
Solution Approach 1:
The patent employs a flexible belt instead of rigid cylindrical bodies to create the magnetic field. This flexible belt can conform to the substrate surface and maintain prolonged contact during the printing process, thereby increasing the duration of magnetic field exposure to the coating composition without compromising production speed.
Solution Approach 2:
The invention transitions from a conventional three-dimensional cylindrical magnetic element to a two-dimensional flexible belt structure. This dimensional change allows the magnetic field-generating surface to extend across the entire substrate width, maximizing the contact area and duration while maintaining compatibility with high-speed printing processes.
2Manufacturing precision
If increased exposure time is provided for magnetic particles, then the quality of optical effect layers is improved, but the device size increases
Solution Approach 1:
The flexible belt structure provides a thin, planar magnetic field-generating element that can be integrated into the printing device without significantly increasing its volume. The belt's flexibility allows it to maintain close proximity to the substrate throughout the printing process, ensuring prolonged exposure time and high-quality optical effect layers within a compact device footprint.
Solution Approach 2:
The flexible belt is driven by rollers to move periodically across the substrate, creating a continuous cycle of magnetic field exposure. This periodic motion ensures that the coating composition receives sufficient exposure time for high-quality particle orientation while maintaining a compact device structure through efficient cyclic operation.
3Adaptability or versatility
If conventional cylindrical magnetic elements are used, then the magnetic field generation is effective, but the adaptability to different coating compositions and printing processes is limited
Solution Approach 1:
The flexible belt can be easily adapted to accommodate different coating compositions and printing process parameters. Its flexibility allows for adjustments in belt tension, speed, and positioning to optimize magnetic field exposure for various viscosity levels and hardening mechanisms, while maintaining reliable magnetic field generation through consistent material properties.
Solution Approach 2:
The flexible belt system is dynamically adjustable through roller-driven motion control, allowing the magnetic field exposure parameters to be optimized for different coating compositions. The belt's dynamic flexibility enables real-time adjustments to maintain effective magnetic field generation across varying production conditions and material properties.
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 enables high-quality, high-speed production of magnetically induced optical effect layers with increased exposure time for magnetic particles, preserving the quality and size of the printed device, and accommodating various viscosity and hardening mechanisms.
Implementation Method 1
exposing the coating composition in a first state to the magnetic field of the orientation means thereby orienting at least a part of the magnetic or magnetizable pigment particles
Implementation Method 2
orienting device for orienting magnetic or magnetizable pigment particles in a coating composition on the substrate, the orienting device comprising an orientation means, said orientation means being either a magnetic field generating belt or a non-magnetic belt comprising magnetic field generating elements
Data Source
AI summary
The present invention relates to the field of the protection of value documents and value commercial goods. In particular, the invention relates to printing devices and processes for producing optical effect layers (OEL) comprising magnetically oriented magnetic or magnetizable pigment particles. In particular, the present invention provides processes for producing said OELs as anti-counterfeit means on security documents or security articles or for decorative purposes. The printing devices comprise a) an orienting device comprising an orientation means, said orientation means being either a magnetic field generating belt or a non-magnetic belt comprising magnetic field generating elements, said belt being driven by at least two rollers, and b) a hardening unit.