RFID Tag Encapsulation and Continuous Manufacturing
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Solution Overview
Problem
Existing RFID tags are not well-suited for metallic items due to signal interference and have limitations in manufacturing, including high costs for mold changes and low throughput in production.
Innovation Solution
A method for manufacturing RFID tags using a continuous supply of inlays with antennas and wireless communication devices, encapsulated in a plastic extrudate, allowing for mass production with high throughput and flexibility in antenna dimensions without the need for new molds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If injection molding is used to manufacture RFID tag packages, then the tag components can be encased in a protective housing, but the manufacturing process becomes complex and requires expensive molds for each antenna size
Solution Approach 1:
The patent divides the RFID tag into separate components: an inlay containing the antenna and circuitry, and a package housing. The inlay is inserted into a pre-formed package, separating the molding process from the antenna assembly process. This allows the package mold to be reused for different antenna sizes without requiring custom molds for each configuration.
Solution Approach 2:
The package housing is designed as a universal component that can accommodate multiple antenna sizes and types through a standardized insertion process. The same package mold and housing design can be used across different RFID tag variants, eliminating the need for dedicated molds for each antenna configuration.
2Manufacturing precision
If traditional step-by-step assembly is used to manufacture RFID tags, then each component can be carefully assembled, but the production throughput is low and labor-intensive
Solution Approach 1:
The patent combines multiple assembly steps into a single automated process. The inlay is inserted into the package housing in one motion, and the ultrasonic welding simultaneously secures the cover to the base. This merged process eliminates intermediate handling steps and enables continuous production, dramatically increasing throughput while maintaining precision through automated control.
Solution Approach 2:
The manufacturing process is designed as a continuous operation where inlays are fed sequentially into packages, and each insertion is immediately followed by ultrasonic welding without interruption. This continuous flow eliminates idle time between operations and enables high-volume production while maintaining consistent assembly quality through automated repetition.
3Adaptability or versatility
If antennas of different sizes are used for different applications, then the RFID tags can be tuned for specific uses, but new molds are required for each antenna size increasing manufacturing costs
Solution Approach 1:
The patent separates the antenna assembly (inlay) from the package housing, allowing the inlay to be manufactured independently and inserted into a standardized package. This segmentation enables the use of a single universal package mold for all antenna sizes while maintaining the ability to customize antenna dimensions for different applications.
Solution Approach 2:
The package housing is designed as a universal receptacle that can accommodate various inlay sizes and configurations. The standardized package design with consistent insertion and welding procedures allows the same mold and assembly process to be used for RFID tags with different antenna specifications, eliminating the need for multiple specialized molds.
4Manufacturing precision
If manual or semi-automated assembly is used for RFID tag production, then quality control can be maintained, but the manufacturing process is labor-intensive and time-consuming
Solution Approach 1:
The ultrasonic welding process operates continuously without interruption between inlay insertion and cover sealing. The automated system maintains consistent welding parameters and timing for each tag, ensuring uniform quality across all produced items while eliminating the variable human factors that slow down manual assembly processes.
Solution Approach 2:
The patent replaces manual assembly operations with automated ultrasonic welding technology. This substitution eliminates the need for labor-intensive hand assembly while maintaining or improving quality consistency through precise control of welding parameters. The automated system performs insertion and welding in a single integrated operation, dramatically reducing assembly time per unit.
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
Enables efficient and cost-effective mass production of RFID tags suitable for metallic items, overcoming signal interference issues and improving manufacturing efficiency.
Implementation Method 1
a plastic extrudate, said plastic extrudate encapsulating said antenna and said wireless communication device
Implementation Method 2
a metallic reflector which makes the RFID tag more tolerant of nearby metals... the metallic reflector functions as an electrically conductive back plane which reflects RF signals transmitted by the RFID tag antenna away from the metal item
Implementation Method 3
the IC chip converts said programmed information into a corresponding electromagnetic signal which is propagated as radio frequency (RF) waves by the antenna
Data Source
AI summary
A radio frequency identification (RFID) tag and method of manufacturing the same. In a preferred embodiment, the RFID tag includes a radio frequency (RF) inlay, the RF inlay including a carrier sheet, an antenna printed on the carrier sheet and a wireless communication device bonded to the antenna. The RFID tag also includes a plastic extrudate, the RF inlay being disposed within the extrudate so that the antenna and the wireless communication device are encapsulated on all sides within the extrudate. Optional metallic reflector and mounting adhesive layers may be laminated onto the underside of the extrudate. The present invention is also directed to an automated method for manufacturing the above RFID tag, such a method involving, in one embodiment, feeding a continuous supply of RF inlays into a cross-head extruder to yield a continuously extruded block and then cutting the block between successive antennae to yield a plurality of individual RFID tags.