Tamper-Evident Security Label With Segmented Adhesive And Separating Lacquer
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Solution Overview
Problem
Existing security labels and adhesive strips fail to provide a manipulation-detectable feature that remains concealed in the non-manipulated state and result in a sticky surface when detached, as the adhesive layer remains on the surface after removal.
Innovation Solution
A security label with a carrier substrate, a reflective or high refractive index layer, a partial separating lacquer layer, and an all-over adhesive coating, where the adhesive coating separates from the carrier substrate only at points without the separating lacquer layer, ensuring a non-sticky surface and revealing detectable information upon manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesive layer is applied all over the carrier substrate for secure attachment, then the attachment strength is improved, but the surface becomes sticky after removal
Solution Approach 1:
The adhesive coating is segmented into two functional zones: an all-over adhesive layer for attachment, and a partial separating lacquer layer that creates a non-sticky release area. The separating lacquer is applied only in specific regions (e.g., center area) to control where the adhesive remains after removal, thus providing both strong attachment and non-sticky surfaces post-manipulation.
Solution Approach 2:
Different regions of the label are given different properties: the separating lacquer creates localized non-sticky zones while the adhesive coating provides sticky zones. This local differentiation allows the label to have both strong attachment capability and non-sticky release surfaces simultaneously in different areas.
2Object-generated harmful factors
If a separating layer is applied to prevent adhesion for non-sticky surface, then the non-sticky property is improved, but the attachment strength is reduced
Solution Approach 1:
The separating lacquer is applied partially rather than all over the carrier substrate. This segmentation allows the label to have both sticky regions (for attachment) and non-sticky regions (for clean release), resolving the contradiction between needing strong attachment and non-sticky surfaces after removal.
Solution Approach 2:
The separating lacquer provides local non-sticky properties only where applied, while the rest of the surface retains full adhesive properties. This localized application ensures strong attachment where needed while providing non-sticky release surfaces where the separating lacquer is present.
3Loss of information
If the adhesive layer is located on the surface after pulling off for manipulation detection, then the manipulation is detectable, but the surface becomes sticky
Solution Approach 1:
The separating lacquer is strategically positioned to control adhesive release during manipulation. When the label is pulled off, the adhesive layer remains on the separated surface in the non-sticky zones, providing manipulation detection while the separating lacquer ensures those zones remain non-sticky to the touch.
Solution Approach 2:
Different regions serve different functions: areas with separating lacquer provide non-sticky surfaces with visible adhesive for manipulation detection, while areas without separating lacquer maintain full adhesive properties for secure attachment.
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 solution ensures that the security label remains non-sticky on both surfaces after manipulation and only reveals the hidden information when detached, providing a secure and tamper-evident feature.
Implementation Method 1
a reflective layer or a layer with a high refractive index
Implementation Method 2
a reflective layer or a layer with a high refractive index
Implementation Method 3
a partial separating lacquer layer
Data Source
AI summary
A security element, in particular for security labels or adhesive strips, includes the following layers: a) a carrier substrate; b) a reflective layer or a layer with a high refractive index; c) a partial separating lacquer layer; and d) an all-over adhesive coating.