Sealing Label Two-Proof Tamper Evidence
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Solution Overview
Problem
Existing sealing labels face challenges in adhering to relief-like surfaces, leading to incomplete bonding and illegibility of hidden information, especially when the lower layer does not adhere fully to the substrate, and temperature indicators obscure codes when heated.
Innovation Solution
A sealing label with a two-layer structure, where the outer and inner label layers overlap and form a complete adhesive surface, allowing the first proof of tampering to reveal hidden information without obscuring it, even on relief-like surfaces, and a second proof is triggered by irreversible tearing upon relative movement of closure parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a single-layer sealing label with a color layer is used to provide tamper evidence, then the label can be opened to reveal hidden information, but the lower layer must adhere to the entire surface of the substrate otherwise the color layer will not separate over the entire surface and the code may not be fully legible
Solution Approach 1:
The sealing label is divided into two independent layers: an outer label layer with the color layer and an inner label layer that adheres to the substrate. This segmentation allows the inner layer to provide reliable adhesive bonding while the outer layer provides the tamper-evident color function, resolving the conflict between complete adhesion and color layer separation.
Solution Approach 2:
The adhesive function is extracted from the color layer and assigned to a separate inner label layer. This allows the color layer in the outer label layer to separate completely from the substrate when opened, ensuring full legibility of hidden information, while the inner layer maintains reliable adhesive bonding to the substrate.
2Reliability
If a temperature indicator is placed over a numerical code, then the code can be obscured when heated to prevent tampering, but the code becomes illegible when the temperature indicator loses transparency
Solution Approach 1:
The tamper detection function is extracted from the temperature indicator and implemented through the peeling action itself. When the outer label layer is peeled off, the color layer breaks open to reveal hidden information, providing tamper evidence without obscuring the code through transparency changes.
3Reliability
If the outer label layer is peeled off to reveal hidden information, then tamper evidence is provided, but the two label layers may not separate completely over the entire surface
Solution Approach 1:
The label is segmented into an outer label layer and an inner label layer with distinct functions. The outer layer peels off completely to provide tamper evidence, while the inner layer remains adhered to the substrate, ensuring complete separation and full revelation of hidden information.
Solution Approach 2:
Different regions of the label structure have different adhesive properties: the inner label layer has strong adhesive bonding to the substrate, while the outer label layer has controlled adhesion that allows complete peeling. This local differentiation ensures both tamper evidence and complete information revelation.
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
Ensures secure and legible revelation of hidden information, suitable for individualized codes, and maintains visibility even on non-full-surface bonding, with independent triggering of first and second proofs of opening.
Implementation Method 1
The sealing label includes an adhesive layer on its inside facing the closure parts, with which it is glued to the first closure part and to the second closure part
Data Source
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AI summary
The invention relates to a sealing label for a closure (1), comprising an outer label layer (11) and an inner label layer (12), which overlap in an overlap area and form a first tamper-evident seal with a color layer over the overlap area, which breaks open over the overlap area when first opened, wherein an information area (8) free from the tamper-evident seal is provided in the overlap area, which contains information (17a, 17b) that is not visible from the outside.