Multilayer Film Inkjet Print Nesting for Security
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Solution Overview
Problem
Existing multilayer films used in security documents are vulnerable to manipulation and counterfeiting due to surface-applied individualization features that can be easily damaged or altered, lacking optimal protection and durability.
Innovation Solution
A method for producing multilayer films where an ink or print is integrated within the layers, allowing for arbitrary positioning and interaction with other layers, providing protection against mechanical influences and enhancing security through optical interactions and localized modifications such as diffractive structures and breaking points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If customization features are applied to the surface of multilayer films, then visual appearance and individualization are achieved, but the features become susceptible to damage and manipulation
Solution Approach 1:
The patent embeds the customization layer within the multilayer film structure, nesting it between protective layers. This allows the customized visual features to be integrated inside the film rather than applied on the surface, protecting them from damage while maintaining their visual appearance and individualization functionality.
Solution Approach 2:
The invention transitions from surface-level customization to volumetric integration by incorporating the customization layer within the thickness of the multilayer film. This dimensional change from 2D surface application to 3D internal integration provides both customization capability and enhanced protection.
2Adaptability or versatility
If individualization features are applied after multilayer film production, then customization flexibility is maintained, but the features lack optimal protection
Solution Approach 1:
The patent applies the customization layer during the multilayer film production process itself, rather than as a subsequent post-processing step. This preliminary integration ensures that the customized features are embedded within the film structure from the beginning, providing them with inherent protection against manipulation while maintaining customization flexibility.
Solution Approach 2:
The invention merges the customization process with the multilayer film production process. By combining these previously separate operations into a single integrated process, the customized features become an intrinsic part of the film structure, eliminating the vulnerability associated with post-application while preserving adaptability.
3Reliability
If print is integrated within multilayer film layers, then protection against mechanical influences is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs a coating layer that serves multiple functions: it acts as a protective barrier against mechanical influences while simultaneously serving as the medium for applying customization features. This multi-functionality reduces the need for separate protective layers, thereby managing manufacturing complexity while achieving enhanced protection.
Solution Approach 2:
The invention uses a composite multilayer structure where different layers with specific properties are combined. The customization layer is integrated within this composite structure, allowing it to benefit from the protective properties of surrounding layers while maintaining its individualization function. This composite approach manages complexity through functional integration rather than adding separate protective components.
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 integrated print within the multilayer film structure enhances durability and security by isolating it from surface damage, making manipulation more difficult and providing enhanced optical effects and security features, thus improving the overall protection against counterfeiting.
Implementation Method 1
allows for interaction, particularly optical interaction, between at least one print and the other layers of the multilayer body and/or with other optical features or elements of the multilayer film, especially with optically variable elements. This allows, for example, the creation of color overlays and/or color changes.
Implementation Method 2
desired predetermined breaking points in the multilayer body and/or locally modified diffractive structures can be created through pressure.
Data Source
Figure 1
Figure 2A~2D
Figure 3A~3D
AI summary
The invention relates to a method for producing a multilayer film (10), wherein in at least one step at least one ink is applied to a layer by means of inkjet printing, thereby providing at least one area of at least one first print (100), and wherein the first print (100) is covered by at least one further layer. Furthermore, the invention relates to a multilayer film (10), in particular produced by a method according to the invention, comprising at least one first print (100), wherein the print (100) is produced by means of inkjet printing, and wherein the print (100) is arranged within the multilayer film (10) and is covered by further layers of the multilayer film (10).