RFID Inlet Antenna Tamper-Resistant Release Coating
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Solution Overview
Problem
RFID inlet antennas with metallic circuits attached to items can be fraudulently detached and reused, as existing solutions like slits on the adhesive layer are difficult to implement due to the thinness of the adhesive layer and the roll-to-roll production process.
Innovation Solution
A specifically patterned release coating layer is formed on the interface between the resin base film and the adhesive layer, with a weaker bonding strength than the adhesive layer, overlapping the outer periphery and metallic circuit, ensuring the metallic circuit is detached and destroyed before the adhesive layer is compromised during unauthorized detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a release coating layer is formed on the interface between the resin base film and adhesive layer to prevent unauthorized detachment, then the metallic circuit can be destroyed upon detachment, but the bonding strength between the release coating layer and resin base film must be weaker than that between the adhesive layer and resin base film
Solution Approach 1:
The release coating layer is applied selectively to specific regions of the resin base film where unauthorized detachment is most likely to occur, such as peripheral areas or regions with thinner adhesive coverage. This localized application creates varying bonding strengths across different areas, allowing the circuit to be destroyed at critical points while maintaining overall structural integrity during normal use.
Solution Approach 2:
The bonding strength parameter of the release coating layer is deliberately controlled to be weaker than that of the adhesive layer. This is achieved by adjusting the coating composition, thickness, or curing conditions of the release coating layer, creating a predetermined weak interface that fails first during unauthorized detachment, thereby destroying the circuit before the adhesive layer can be compromised.
2Reliability
If slits are formed on the adhesive layer to facilitate circuit destruction, then unauthorized detachment is prevented, but slitting the thin adhesive layer is difficult to implement
Solution Approach 1:
Instead of attempting to slit the thin adhesive layer directly, the release coating layer is applied in a segmented or patterned manner, leaving gaps or discontinuities that naturally create weak points. This segmentation approach achieves the circuit destruction function without requiring precise slitting of the adhesive layer, simplifying the manufacturing process.
Solution Approach 2:
The release coating layer serves as an intermediary element between the resin base film and adhesive layer. Rather than directly modifying the adhesive layer (which is difficult to slit), the release coating layer is introduced as a mediating component that provides the necessary weak interface for circuit destruction while being easier to apply and control during manufacturing.
3Reliability
If the release coating layer overlaps the outer periphery and metallic circuit, then the circuit is ensured to be destroyed upon detachment, but the release coating layer must be positioned precisely
Solution Approach 1:
The release coating layer is applied in advance during the manufacturing process, before the RFID inlet antenna is assembled and deployed. This preliminary application allows the coating to be positioned relative to the circuit pattern while the components are still in a manageable state, ensuring proper overlap without requiring high-precision positioning during final assembly.
Solution Approach 2:
Instead of relying solely on precise lateral positioning of the release coating layer, the solution extends into the vertical dimension by controlling the thickness and vertical profile of the coating. The release coating layer is formulated to extend vertically sufficient to reach and interfere with the metallic circuit upon detachment, providing a tolerance buffer that reduces the need for extremely precise lateral alignment.
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
Prevents unauthorized detachment of the metallic circuit by ensuring the release coating layer is detached first, followed by destruction of the circuit, thereby preventing fraudulent reuse.
Implementation Method 1
a release coating layer provided on a portion of an interface between the resin base film and the adhesive layer, wherein a bonding strength between the release coating layer and the resin base film is weaker than a bonding strength between the adhesive layer and the resin base film
Data Source
AI summary
The present invention provides an RFID inlet antenna comprising a resin base film and a metallic circuit formed via an adhesive layer on the surface of the resin base film. The RFID inlet antenna is prevented from removal of the metallic circuit by unauthorized detachment after the RFID inlet antenna is bonded to an item by a bonding material disposed in such a manner as to cover the metallic circuit.