Paper Roll Core RFID Tag Recess Design
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Solution Overview
Problem
Existing solutions for identifying and tracking paper rolls, such as RFID tags placed between the core and the paper, face challenges due to electromagnetic wave attenuation and wavelength changes caused by the paper, leading to reduced tag functionality and readability.
Innovation Solution
A paper roll core with a recessed area for a flexible RFID tag, where the tag's antenna is coiled and secured, minimizing paper impact on radio wave propagation and providing physical protection, allowing for enhanced readability from the end face.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RFID tag is placed between the core and the paper stock, then the tag is retained with the roll throughout the life cycle, but the paper attenuates the electromagnetic wave twice (reader to tag and tag to reader), reducing tag functionality
Solution Approach 1:
The RFID tag is extracted from the position between the core and paper stock, and repositioned to the outer surface of the core. This removes the tag from the harmful electromagnetic attenuation environment created by the paper layers, while maintaining tag retention through the recess structure and adhesive application.
Solution Approach 2:
The tag placement transitions from a radial position (between core and paper) to an axial position (outer surface of core). This dimensional change allows the electromagnetic waves to travel through air rather than paper, eliminating the attenuation problem while the recess ensures the tag remains attached to the roll.
2Use of energy by moving object
If the tag antenna is made large to collect sufficient energy, then energy collection improves, but the tag becomes more difficult to fit in limited space and more vulnerable to damage
Solution Approach 1:
The tag is nested within a recess structure on the core surface. This recess provides a protected cavity that accommodates the antenna and tag components, allowing sufficient antenna size for energy collection while protecting the tag from external damage and simplifying installation.
Solution Approach 2:
The recess is pre-formed on the core before tag installation. This preliminary preparation creates a ready-made housing that guides and secures the tag in the correct position, making the tagging process simpler and ensuring optimal antenna orientation for energy collection.
3Reliability
If the tag is placed on the inner surface of the core, then the tag is protected from wear and detachment, but the radio wave must propagate through both the paper stock and core wall thickness, increasing attenuation
Solution Approach 1:
The recess acts as an intermediary structure that allows the tag to be positioned on the outer surface of the core rather than embedded internally. This mediator position enables direct electromagnetic wave access from the reader while the recess structure and adhesive provide the necessary protection and retention.
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 reliable and efficient RFID tag readability throughout the paper roll's life cycle, unaffected by paper thickness or grade, with a large antenna surface area for improved energy collection and data transmission.
Implementation Method 1
the springback force evolved as a result of coiling said flexible segment retains the tag essentially stationary, bracing said flexible segment against a wall and/or a bottom included in the recess
Implementation Method 2
the passive UHF-band RFID tag chip does not possess its own energy source at all, whereby the microchip must obtain all of its necessary energy by way of a tag antenna from the electromagnetic wave transmitted by the reader
Implementation Method 3
paper as a medium has an impact on the electromagnetic wave between a reader and an RFID tag, and thereby on the working of the entire RFID system
Data Source
Figure 1~3D
Figure 4A~5D
AI summary
A paper roll core (201), which comprises a tag (203) and wherein the tag is a tag which is radio-readable and comprises a flexible element. The core has its end face provided with a recess (202) with a bottom and a wall, in which the tag (203) is fitted in an at least partially coiled configuration. For example, the tag can be glued in the recess. Alternatively or additionally, the tag can be retained substantially stationary by a springback force evolved as a result of coiling said flexible element, bracing said flexible element against a wall and/or a bottom included in the recess (203).