Barrier Structure Surface Relief Flexibility
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Solution Overview
Problem
Existing light and gas barrier structures, particularly in scratch-off foils and displays, face challenges with flexibility, cracking, and light transmission due to the brittleness of thick metal layers, and they struggle to maintain high opacity under mechanical deformation.
Innovation Solution
A bi-layer metallised film sandwich structure with microstructured layers, where one layer has a holographic or diffusive surface relief and the other a thin, microscopically structured spacer layer, enhances opacity and flexibility by diffusing and scattering light, while the spacer layer acts as a surface relief generator to increase metallization density and resistance to bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If thick metal layers are used for light barriers, then light blocking capability is improved, but flexibility deteriorates and cracking occurs
Solution Approach 1:
The patent divides the thick metal barrier layer into multiple thin metal layers separated by a flexible spacer layer. This segmentation allows the structure to maintain light blocking capability through multiple barriers while the spacer layer provides flexibility and prevents cracking by accommodating substrate deformation.
Solution Approach 2:
The spacer layer acts as an intermediary between the rigid metal barrier layers and the flexible substrate. It mediates the mechanical stress by absorbing deformation energy, preventing the brittle metal layers from cracking while maintaining the light blocking function.
2Object-affected harmful factors
If thick metal layers are used for light barriers, then light blocking capability is improved, but the structure becomes brittle and prone to cracking
Solution Approach 1:
By segmenting the thick metal layer into multiple thin layers separated by flexible spacer material, the structure maintains effective light blocking while the flexible interfaces prevent stress concentration that would cause cracking.
Solution Approach 2:
The patent creates a composite structure combining rigid metal barrier layers with flexible spacer layers. This composite material approach provides both the light blocking capability of metal and the cracking resistance of flexible materials.
3Strength
If planar aluminium films are laminated together, then flexibility is improved, but opacity and light blocking capability deteriorate
Solution Approach 1:
The patent segments the barrier function across multiple thin metal layers rather than relying on a single thick planar layer. This segmentation maintains flexibility through the spacer layer while achieving superior opacity through the cumulative effect of multiple light-blocking interfaces.
Solution Approach 2:
The patent uses a composite structure of thin metal layers and flexible spacer material that combines the light blocking properties of metal with the flexibility of the substrate, achieving both opacity and flexibility simultaneously.
4Object-affected harmful factors
If surface relief microstructures are added, then light scattering and opacity are improved, but manufacturing complexity increases
Solution Approach 1:
The spacer layer serves dual functions: it provides mechanical flexibility and simultaneously generates the surface relief microstructures through its own deformation. When the flexible substrate is deformed, the spacer layer creates corresponding surface relief patterns that scatter light, eliminating the need for separate manufacturing steps.
Solution Approach 2:
The spacer layer performs multiple functions: mechanical support, flexibility provision, surface relief generation, and light scattering. This multi-functionality reduces manufacturing complexity by consolidating multiple requirements into a single layer.
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
The structure achieves superior opacity and resistance to cracking, maintaining high opacity even under bending, with enhanced light blocking capabilities and flexibility, suitable for data protection and optical security applications.
Implementation Method 1
the template layer comprises a plurality of particles arranged to span substantially an entire thickness of the template layer and to provide said optically active surface relief
Implementation Method 2
an optically active surface relief having optionally at least one selected from amongst a holographic surface relief, a non-holographic diffractive surface relief and a diffusive surface relief
Implementation Method 3
enhances opacity and flexibility by diffusing and scattering light
Implementation Method 4
diffusing and scattering light
Implementation Method 5
the spacer layer acts as a surface relief generator to increase metallization density and resistance to bending
Implementation Method 6
enhanced light blocking capabilities
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A structure (520,560,580...) comprising: a template layer having a first surface having an optically active surface relief; and an epibarrier layer provided over the first surface of the template layer, the epibarrier layer having an optically active surface relief corresponding substantially to that of the first surface of the template layer, wherein the template layer comprises a plurality of particles arranged to span substantially an entire thickness of the template layer and to provide said optically active surface relief.