Security Element Transfer Material with Composite Carrier
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Solution Overview
Problem
Existing security element transfer materials face challenges in achieving clean edges and stability during transfer, as they often result in unclean edges and residual film contamination due to the tearing of carrier materials, especially when using UV embossing varnishes and plastic films with low tear resistance.
Innovation Solution
A security element transfer material with a carrier substrate composite of two films permanently bonded by an adhesive layer, using a shadow mask with perforations to prevent sticking and ensure clean edges, and a heat-sealing lacquer for precise application, allowing the functional layers to remain on the substrate while the carrier film remains intact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single carrier film is used for security element transfer, then the structure is simple, but the film tears easily during transfer due to low tear resistance
Solution Approach 1:
The patent applies composite materials by bonding two different films (first film and second film) together to form a carrier composite. The first film provides tear resistance while the second film provides release properties, creating a composite structure that simultaneously achieves both tear resistance and easy release of security elements during transfer.
2Reliability
If the carrier film is made thicker to prevent tearing, then tear resistance improves, but the transfer precision and edge cleanliness deteriorate
Solution Approach 1:
The patent segments the carrier into two distinct functional films with different thicknesses and properties. The first film (with higher tear resistance) can be thinner since it doesn't need to provide release properties, while the second film provides the release function. This segmentation allows each film to be optimized for its specific function, achieving both tear resistance and transfer precision without requiring excessive thickness.
3Strength
If heat-sealing lacquer is applied to the entire carrier surface, then bonding is strong, but residues remain on transferred patches from torn film areas
Solution Approach 1:
The patent extracts the release function from the entire carrier surface by applying a release layer only to specific areas (the second film), while the first film remains without release layer. This allows the security elements to be cleanly transferred from the first film to the target substrate without carrying residues from torn areas, as the release layer is strategically positioned to prevent adhesion only where needed.
4Ease of operation
If a release layer is added to prevent sticking, then release ease improves, but the layer structure complexity increases
Solution Approach 1:
The patent merges the release layer with the second film, making the second film itself serve as the release layer. This integration eliminates the need for a separate release layer component, reducing overall structure complexity while still providing the necessary release function. The second film's material properties are selected to inherently provide release characteristics.
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 approach ensures reliable transfer with clean edges and minimal residual film, maintaining the stability of the carrier film and preventing tears, thus ensuring precise and smooth application of security elements.
Implementation Method 1
a first film (1) and a second film (2), which are permanently bonded together by means of an adhesive layer (10)
Implementation Method 2
an adhesive layer, usually made of a heat-seal adhesive or A heat-sealing lacquer that melts during the transfer of the security elements and bonds the security elements to the object to be secured
Implementation Method 3
A mask layer (4) having at least one recess, which is designed such that the security element layer composite can be bonded to the value document substrate in the region of the at least one recess of the mask layer
Data Source
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AI summary
The invention relates to a security element transfer material comprising: - a security element layer composite having a plurality of layers, including at least one feature layer producing an optically variable effect and an adhesive layer, wherein the feature layer is the layer that faces an observer after a security element has been transferred to a document substrate; - a carrier substrate that is detachably connected to the feature layer of the security element layer composite;- a mask layer having at least one recess, designed in such a way that the security element layer assembly can be bonded to the document substrate in the area of the at least one recess of the mask layer by means of the adhesive layer and then detached from the carrier substrate, wherein bonding of the security element layer assembly to the document substrate and subsequent detachment of the security element layer assembly from the carrier substrate is prevented in the area outside the at least one recess of the mask layer.