Tamper-Evident Label with Stretchable Base Layer and Adhesive Residue
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Solution Overview
Problem
Existing tamper-proof labels are not easily recognizable by the naked eye after peeling and can be re-adhered, posing challenges in design complexity and production costs.
Innovation Solution
A label comprising a base layer with a thermoplastic resin and inorganic or organic fillers, stretched to achieve specific internal bond strengths and porosity, ensuring it breaks upon peeling and remains in an unintended shape, making re-adhesion difficult.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a breakable layer with colored or metallic luster is added to make peeling recognizable, then the visibility of peeling is improved, but the production process becomes more complex and costs increase
Solution Approach 1:
The patent utilizes the inherent color difference between the label backing paper and the adhesive residue. The backing paper is designed to be torn away, leaving colored adhesive residue on the transparent or light-colored adherend surface, making peeling recognition possible without adding specialized colored or metallic layers to the label structure itself
Solution Approach 2:
The patent employs a simple, disposable backing paper that is torn away during peeling. The recognition of peeling is achieved through the permanent adhesive residue left on the adherend, eliminating the need for complex, expensive, or durable materials with special optical properties
2Difficulty of detecting and measuring
If the adhesive layer is made to break simultaneously with the breakable layer, then the peeling recognition is improved, but the stress stability and shape consistency of the remaining portion become unstable
Solution Approach 1:
The patent separates the breaking function from the adhesive function. The backing paper breaks away while the adhesive layer remains intact and adheres to the adherend, creating a stable, consistent remaining portion that provides reliable peeling recognition without compromising structural integrity
Solution Approach 2:
The patent designs the adhesive layer to have controlled adhesion strength that prevents simultaneous breaking with the backing paper. This controlled differential breaking ensures the adhesive layer acts as a cushion that maintains stress stability and shape consistency of the remaining label portion on the adherend
3Reliability
If a plastic film with high residual strain is used to prevent re-adhesion through deformation, then re-adhesion prevention is improved, but the visibility of peeling by naked eye is reduced
Solution Approach 1:
The patent uses the color contrast between the torn backing paper and the adhesive residue left on the adherend to provide visual peeling recognition, while the plastic film deformation provides mechanical re-adhesion prevention through shape change that makes proper alignment difficult
4Ease of manufacture
If the label structure is simplified to reduce production costs, then manufacturing simplicity is improved, but the ability to prevent re-adhesion and ensure recognition is compromised
Solution Approach 1:
The patent makes the adhesive layer serve multiple functions: it provides the bonding function to attach the label to the adherend, and simultaneously serves as the visual indicator of peeling through the residue left on the adherend surface. The backing paper provides both structural support and the tearing mechanism for activation
Solution Approach 2:
The adhesive layer automatically provides the peeling recognition function through its inherent property of leaving residue on the adherend surface when the backing paper is torn away. No additional components or mechanisms are required - the adhesive itself serves as both the bonding agent and the visual indicator
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 label is easily recognizable post-peeling and resistant to re-adhesion, achieved with a simple structure and cost-effective production process.
Implementation Method 1
the base layer (A) containing a thermoplastic resin and at least one of inorganic fine powder and an organic filler, and being stretched in at least one direction
Data Source
AI summary
A label containing a base layer (A) and an adhesive layer (C) provided in contact with one surface of the base layer (A), wherein the base layer (A) contains a thermoplastic resin and at least one of inorganic fine powder and an organic filler, and the base layer (A) is stretched in at least one direction, and the film has an internal bond strength measured according to TAPPI T569 of from 0.4 to 0.95 kg·cm on a side of the adhesive layer (C) and from 0.4 to 1.5 kg·cm on a side opposite thereto, is easily recognized by the naked eye for the fact that the film has been peeled from an adherend, and is difficult to be restored by re-adhering after peeling.